QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

POWER SUPPLY













AC 100-240V Wide-range Input
Width only 60mm
Efficiency up to 92%
150% (360W) Peak Load Capability
Easy Fuse Tripping due to High Overload Current
Active Power Factor Correction (PFC)
Negligible low Inrush Current Surge
Short-term Operation down to 60Vac and up to 300Vac
Full Power Between -25°C and +60°C
DC-OK Relay Contact
Quick-connect Spring-clamp Terminals
3 Year Warranty

GENERAL DESCRIPTIONSHORT-FORM DATA

The most outstanding features of this Dimension QSeries DIN-rail power supply are the high efficiency andthe small size, which are achieved by a synchronousrectification and further novel design details. The QSeries is part of the Dimension family, existing alongside
the lower featured C-Series.

Output voltage
Adjustment range
Output current

With short-term peak power capability of 150% andbuilt-in large sized output capacitors, these features
help start motors, charge capacitors and absorb reverse
energy and often allow a unit of a lower wattage class
to be used.
High immunity to transients and power surges as well as
low electromagnetic emission makes usage in nearly
every environment possible.
The integrated output power manager, a wide range
input voltage design and virtually no input inrush
current make installation and usage simple. Diagnostics
are easy due to the dry DC-ok contact, a green DC-ok
LED and red overload LED.

DC 48V
48 – 56V
5 – 4.3A
7.5 – 6.5A
Output power
240W
360W
Output ripple< 100mVpp
Input voltage
AC 100-240V
Mains frequency
50-60HzAC Input current
2.22 / 1.22A
Power factor
0.98 / 0.92
AC Inrush current
typ. 4 / 7A peak
Efficiency
91.2 / 92.0%
Losses23.2 / 20.9W
Temperature range -25°C to +70°C
Derating
6W/°C
Hold-up time
typ. 27 / 28ms
Dimensions
60x124x117mm

continuous
for typ. 4s
continuous
for typ. 4s
20Hz to 20MHz±15%±6%
at 120 / 230Vac
at 120 / 230Vac
at 120 / 230Vac
at 120 / 230Vac
at 120 / 230Vac
operational+60 to +70°C
at 120 / 230Vac
WxHxD

Unique quick-connect spring-clamp terminals allow asafe and fast installation and a large international
approval package for a variety of applications makes
this unit suitable for nearly every situation.

ORDER NUMBERS

MARKINGSPower Supply

QS10.481

48-56V Power supply

Accessory

ZM1.WALL
ZM13.SIDE
YR2.DIODE
UF20.481

Wall mount bracket
Side mount bracket
Redundancy module
Buffer unit

UL 508

IEC 61010-2-201

MarineMarineNov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

Class I Div 2

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QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

INDEX
Page
1. Intended Use .......................................................3
2. Installation Requirements ...................................3
3. AC-Input...............................................................4
4. DC-Input...............................................................5
5. Input Inrush Current ...........................................6
6. Output .................................................................7
7. Hold-up Time .......................................................9
8. DC-OK Relay Contact ..........................................99. Efficiency and Power Losses..............................10
10. Reliability ...........................................................11
11. Functional Diagram...........................................12
12. Terminals and Wiring ........................................12
13. Front Side and User Elements ...........................13
14. EMC ....................................................................14
15. Environment ......................................................15
16. Protection Features ...........................................16
17. Safety Features ..................................................16
18. Dielectric Strength ............................................17
19. Approvals and Fulfilled Standard .....................18
20. Regulatory Compliance .....................................19
21. Physical Dimensions and Weight ......................20Page
22. Accessories ........................................................ 21
22.1. ZM1.WALL Wall Mounting Bracket ....... 21
22.2. ZM13.SIDE Side Mounting Bracket ........ 21
22.3. UF20.481 Buffer Module .......................... 2222.4. YR2.DIODE Redundancy Module ............. 22
23. Application Notes ............................................. 2323.1. Repetitive Pulse Loading .......................... 2323.2. Peak Current Capability ........................... 24
23.3. Back-feeding Loads .................................. 24
23.4. External Input Protection ......................... 24
23.5. Charging of Batteries ............................... 25
23.6. Output Circuit Breakers............................ 25
23.7. Parallel Use to Increase Output Power .... 26
23.8. Parallel Use for Redundancy .................... 26
23.9. Daisy Chaining of Outputs ....................... 27
23.10. Series Operation ....................................... 27
23.11. Inductive and Capacitive Loads................ 27
23.12. Operation on Two Phases ........................ 28
23.13. Use in a Tightly Sealed Enclosure ............ 28
23.14. Mounting Orientations ............................ 29

The information presented in this document is believed to be accurate and reliable and may change without notice.
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.

TERMINOLOGY AND ABREVIATIONSPE andsymbolPE is the abbreviation for Protective Earth and has the same meaning as the symbol.

Earth, Ground

This document uses the term “earth” which is the same as the U.S. term “ground”.

T.b.d.

To be defined, value or description will follow later.

AC 230V

A figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances (usually ±15%) included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)

230VacA figure with the unit (Vac) at the end is a momentary figure without any additional
tolerances included.

50Hz vs. 60Hz

As long as not otherwise stated, AC 230V parameters are valid at 50Hz mains frequency.

may

A key word indicating flexibility of choice with no implied preference.

shall

A key word indicating a mandatory requirement.

shouldA key word indicating flexibility of choice with a strongly preferred implementation.

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

1. INTENDED USEThis device is designed for installation in an enclosure and is intended for commercial use, such as in industrial control,
process control, monitoring and measurement equipment or the like. Do not use this device in equipment where
malfunction may cause severe personal injury or threaten human life.
If this device is used in a manner outside of its specification, the protection provided by the device may be impaired.

2. INSTALLATION REQUIREMENTS
Install device in an enclosure providing protection against electrical, mechanical and fire hazards. Install the device
onto a DIN-rail according to EN 60715 with the input terminals on the bottom of the device. Other mounting
orientations require a reduction in output current.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper cables that aredesigned for a minimum operating temperature of 60°C for ambient temperatures up to +45°C, 75°C for ambient
temperatures up to +60°C and 90°C for ambient temperatures up to +70°C. Ensure that all strands of a stranded wire
enter the terminal connection.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed.
The enclosure of the device provides a degree of protection of IP20. The enclosure does not provide protection against
spilled liquids.
The isolation of the device is designed to withstand impulse voltages of overvoltage category III according to IEC
60664-1. The device is designed as “Class of Protection” I equipment according to IEC 61140. Do not use without aproper PE (Protective Earth) connection.
The device is suitable to be supplied from TN, TT or IT mains networks. The continuous voltage between the input
terminal and the PE potential must not exceed 276Vac.
The input can also be powered from batteries or similar DC sources. The continuous voltage between the supply
voltage and the PE/ground potential must not exceed 375Vdc.
A disconnecting means shall be provided for the input of the device.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do notcover ventilation grid!
The device is designed for altitudes up to 5000m (16400ft). Above 2000m (6560ft) the overvoltage category is reduced
to level II and a reduction in output current is required. Keep the following minimum installation clearances: 40mm on
top, 20mm on the bottom, 5mm left and right side. Increase the 5mm to 15mm in case the adjacent device is a heatsource. When the device is permanently loaded with less than 50%, the 5mm can be reduced to zero.
The device is designed, tested and approved for branch circuits up to 20A without additional protection device. If an
external fuse is utilized, do not use circuit breakers smaller than 6A B- or 4A C-Characteristic to avoid a nuisancetripping of the circuit breaker.
The maximum surrounding air temperature is +70°C (+158°F). The operational temperature is the same as the ambientor surrounding air temperature and is defined 2cm below the device.
The device is designed to operate in areas between 5% and 95% relative humidity.

WARNING Risk of electrical shock, fire, personal injury or death.
- Do not use the power supply without proper grounding (Protective Earth). Use the terminal on the input block forearth connection and not one of the screws on the housing.
- Turn power off before working on the device. Protect against inadvertent re-powering.
- Make sure that the wiring is correct by following all local and national codes.
- Do not modify or repair the unit.
- Do not open the unit as high voltages are present inside.
- Use caution to prevent any foreign objects from entering the housing.
- Do not use in wet locations or in areas where moisture or condensation can be expected.
- Do not touch during power-on, and immediately after power-off. Hot surfaces may cause burns.
Notes for use in hazardous location areas:
The device is suitable for use in Class I Division 2 Groups A, B, C, D locations.
WARNING EXPLOSION HAZARDS!
Substitution of components may impair suitability for this environment.
Do not disconnect the device or operate the voltage adjustment unless power has been switched off or the area isknown to be non-hazardous.
Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

3. AC-INPUT
AC input
AC input rangenom.

AC 100-240V
suitable for TN-, TT- and IT mains networks
85-276Vaccontinuous operation
60-85Vacfull power for 200ms, no damage between 0 and 85Vac
276-300Vac< 500msmax.
276Vaccontinuous, IEC 62103
nom.
50–60Hz
±6%
typ.
81Vac
steady-state value, see Fig. 3-1
typ.
63Vac
steady-state value, see Fig. 3-1
typ.
55Vac
dynamic value
See recommendations in chapter 22.4.

Allowed voltage L or N to earth
Input frequency
Turn-on voltage
Shut-down voltage
External input protection

Input current
Power factor *)Crest factor **)Start-up delay
Rise timeAC 100V
2.65A
0.99
1.65
800ms
8ms
15ms
100mV

typ.
typ.
typ.
typ.
typ.
typ.
max.

Turn-on overshootAC 120V
2.22A
0.98
1.67
650ms
8ms
15ms
100mV

AC 230V
1.22A
0.92
1.85
340ms
8ms
15ms
100mV

at 48V, 5A, see Fig. 3-3
at 48V, 5A, see Fig. 3-4
at 48V, 5A
see Fig. 3-2
0mF, 48V, 5A, see Fig. 3-2
5mF, 48V, 5A, see Fig. 3-2
see Fig. 3-2*) The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.
**) The crest factor is the mathematical ratio of the peak value to RMS value of the input current waveform.

Rated
input range

Shut-down

full
power
for
200ms

60V

max.
500ms

Turn-on

POUT

Fig. 3-2 Turn-on behavior, definitions

OutputVoltage

VIN
85V

Input
Current, typ.

2.4
2.0
1.6
1.2

Start-up
delay

Rise
Time

Fig. 3-4 Power factor vs. output load
Power Factor, typ.

1.0

ac
0V
10
c
Va
120

0.95

c
30Va

0.85

2

0.8

100Vac120Vac

230Vac

0.9

0.8

0.4
0

- 5%

276V 300Vac

Fig. 3-3 Input current vs. output load at 48V

2.8A

Input
Voltage

OvershootFig. 3-1 Input voltage range

Output Current

0.5

1 1.5 2 2.5 3 3.5 4 4.5 5A

Output Current

0.75
0.5

1 1.5 2 2.5 3 3.5 4 4.5 5A

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

4/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

4. DC-INPUT
QS10.481:
DC input
DC input range
DC input currentnom.

DC 110-150V
88-187Vdc
2.37A-20%/+25%
continuous operation
110Vdc, at 48V, 5A

typ.

DC 110-300V
88-375Vdc
2.37/ 0.85A-20%/+25%
continuous operation
110/300Vdc, at 48V, 5A

max.
typ.
typ.

375Vdc80Vdc
55Vdc

continuous, IEC 62103
steady state value
steady state value

typ.

QS10.481-D1:
DC input
DC input range
DC input currentnom.

All units:
Allowed Voltage L/N to Earth
Turn-on voltage
Shut-down voltage

Instructions for DC use:a) Use a battery or similar DC source.
For other sources contact PULSb) Connect +pole to L and –pole to N.
c) Connect the PE terminal to a earth wire or to the machine
ground.

Fig. 4-1 Wiring for DC Input

Battery+

Power Supply
AC
L
N
PE

-

+
-

Load

DC

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

5/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

5. INPUT INRUSH CURRENT
An active inrush limitation circuit limits the input inrush current after turn-on of the input voltage and after short
input voltage interruptions.
The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.

Inrush current
Inrush energy
Inrush delay (A)

max.
typ.
max.
typ.

AC 100V
10Apeak
5Apeak
4A2s
650ms

AC 120V
10Apeak
4Apeak
4A2s
520ms

AC 230V
10Apeak
7Apeak
4A2s
250ms

over entire temperature range
over entire temperature range
over entire temperature rangesee (A) in Fig. 5-1

Fig. 5-1 Input inrush current, typical behavior

A….

Inrush delay

Input:
Output:Ambient:
Upper curve:
Middle curve:
Lower curve:Time basis:

230Vac48V, 5A
25°C
Input current 2A / DIVInput voltage 500V / DIV
Output voltage 40V / DIV
100ms / DIV

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

6/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

6. OUTPUT
Output voltage
Adjustment range
Factory settingLine regulation
Load regulation
Ripple and noise voltage
Output current

Output power
BonusPower® time

BonusPower® recovery time
Overload behaviour
Short-circuit current

Output capacitance
*)

**)
***)

nom.
max.
typ.
max.
max.
max.
nom.
nom.
nom.

48V
48-56V58V ***)
48.0V
10mV
100mV
100mVpp
5A
4.3A
7.5A *)

nom.

6.5A *)

nom.
nom.
typ.
min.
max.
typ.

240W
360W *)
4s
3s
5s
7s
cont. current
3A **)
7A **)
5A **)
15A **)
7.5A **)
3 000µF

min.
max.
min.
max.
max.
typ.

guaranteed
at clockwise end position of potentiometer±0.2%, at full load, cold unit
60-300Vac
static value, 0A  5A
20Hz to 20MHz, 50Ohm
continuously available at 48V, see Fig. 6-1
continuously available at 56V, see Fig. 6-1
short term available BonusPower® *),at 48V, for typical 4s, see Fig. 6-1
short term available BonusPower® *),at 56V, for typical 4s, see Fig. 6-1
continuously available
short term available BonusPower® *)duration until the output voltage dips, see Fig. 6-2

overload free time to reset power manager, see Fig. 6-3
continuous, load impedance 200mOhm, see Fig. 6-1
continuous, load impedance 200mOhm, see Fig. 6-1
during BonusPower® *), load impedance 200mOhm
during BonusPower® *), load impedance 200mOhm
continuous, load impedance <10mOhm, see Fig. 6-1
included inside the power supply

BonusPower®, short term power capability (up to typ. 4s)
The power supply is designed to support loads with a higher short-term power requirement without damage or shutdown. The shortterm duration is hardware controlled by an output power manager. This BonusPower® is repeatedly available. Detailed information
can be found in chapter 22.1. If the power supply is loaded longer with the BonusPower® than shown in the Bonus-time diagram (seeFig. 6-2), the max. output power is automatically reduced to 240W.
Discharge current of output capacitors is not included.
This is the maximum output voltage which can occur at the clockwise end position of the potentiometer due to tolerances. It is notguaranteed value which can be achieved. The typical value is about 56.8V.

Peak current capability (up to several milliseconds)
The power supply can deliver a peak current which is higher than the specified short term current. This helps to start
current demanding loads or to safely operate subsequent circuit breakers.
The extra current is supplied by the output capacitors inside the power supply. During this event, the capacitors will bedischarged and causes a voltage dip on the output. Detailed curves can be found in chapter 22.2.
Peak current voltage dips

typ.
typ.
typ.

from 48V to 42Vfrom 48V to 42Vfrom 48V to 36V

at 10A for 50ms, resistive load
at 20A for 2ms, resistive load
at 20A for 5ms, resistive load

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

7/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

Fig. 6-1 Output voltage vs. output current,
typ.

Output Voltage

60V

Adjustment
Range

56V

50

20
10

OutputCurrent

0
0

2

4

10s
9
8
7
6
5
4
3
2
1
0
110

er m

continuous

30

Bonus Time

rt-t
sho

48V

40

Fig. 6-2 Bonus time vs. output power

6

8

10

12A

max
typ

min
Output Power

120

130

140

150

160%

Fig. 6-3 BonusPower® recovery time
Limitation by
Power Manager

Power
Demand100%t

OutputVoltage

Bonus
Time

Recovery Time
Bonus Power disabledt

The BonusPower® is available as soon as power comes on and immediately after the end of an output short circuit or
output overload.
Fig. 6-4 BonusPower® after input turn-on

Fig. 6-5 BonusPower® after output short

Short ofOutput

Input
Voltage

OutputVoltage

OutputVoltage150%
Output
Power

100%

Bonus
Power

Output
Power

150%

Bonus
Power

100%

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

8/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

7. HOLD-UP TIME
Hold-up TimeAC 100V
51ms
26ms

typ.
typ.

Fig. 7-1 Hold-up time vs. input voltage

Hold-up TimeAC 120V
53ms
27ms

48V, 2.5A, min.

40
30

48V, 5A, typ.
48V, 5A, min.

20
10

Zero Transition
Input
Voltage

85

120

155

190

- 5%

OutputVoltage

Input Voltage0

at 48V, 2.5A, see Fig. 7-1
at 48V, 5A, see Fig. 7-1

Fig. 7-2 Shut-down behavior, definitions

48V, 2.5A, typ.

50ms

AC 230V
55ms
28ms

Hold-up Time

230Vac8. DC-OK RELAY CONTACT
This feature monitors the output voltage, which is produced by the power supply itself. It is independent of a back-fed
voltage from a unit connected in parallel to the power supply output.
Contact closes
Contact opens

As soon as the output voltage reaches the adjusted output voltage level.
As soon as the output voltage dips more than 10% below the adjusted output voltage.
Short dips will be extended to a signal length of 250ms. Dips shorter than 1ms will be ignored.
As soon as the output voltage exceeds 90% of the adjusted voltage.
max
60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A
resistive loadmin
1mA at 5Vdc
min. permissible load
See dielectric strength table in section 18.

Contact re-closes
Contact ratings
Isolation voltage

Fig. 8-1 DC-ok relay contact behavior

VOUT = VADJ
10%

<
1ms

open

closed>1ms

0.9* VADJ

250ms

open

closedNote: The DC-ok feature requires that the output voltage reaches the nominal (=adjusted) level after turn-on in order to function according
to specification. If this level cannot be achieved, the overload lamp will be on and the DC-ok contact will be open. The overload signal
will only shut off as soon as the adjusted voltage is reached. This is an important condition to consider particularly, if the load is abattery, the power supply is used in parallel or the power supply is used for N+1 redundant systems.

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

9/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

9. EFFICIENCY AND POWER LOSSES
Efficiency
Average efficiency *)

typ.
typ.

AC 100V
90.4%
89.6%

AC 120V
91.2%
90.0%

AC 230V
92.0%
90.3%

Power losses

typ.
typ.

5.6W
25.5W

5.7W
23.2W

5.9W
20.9W

*)

at 48V, 5A
25% at 1.25A, 25% at 2.5A,
25% at 3.75A, 25% at 5A
at 48V, 0A
at 48V, 5A

The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25%of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100%of the nominal load for the rest of the time.

Fig. 9-1

Efficiency vs. output current at 48V,
typ.

Efficiency

230Vac120Vac100VacOutput Current

Fig. 9-3

Losses vs. output current at 48V, typ.

Power Losses

93%
92
91
90
89
88
87
86
85
1

Fig. 9-2

1.5

2

2.5

3

3.5

4

4.5

27W
24
21
18
15
12
9
6
3

5A

Efficiency vs. input voltage at 48V,
5A, typ.

100Vac120Vac
230VacOutput Current

0Fig. 9-4

1

2

3

4

5A

Losses vs. input voltage at 48V, 5A,
typ.

Efficiency

Power Losses

94%

32W

93

28

92

24

91

20

90

16
12

89
Input Voltage

88
85

120

155

190

225 260Vac

Input Voltage

8
85

120

155

190

225 260Vac

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

10/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

10. RELIABILITY
Lifetime expectancy *)MTBF **) SN 29500, IEC 61709
MTBF **) MIL HDBK 217F

AC 100V
57 000h
118 000h
161 000h*)
539 000h
932 000h
342 000h

AC 120V
67 000h
112 000h
188 000h*)
566 000h
979 000h
349 000h

AC 230V
81 000h
118 000h
228 000h*)
606 000h
1 048 000h
349 000h

467 000h

478 000h

478 000h

at 48V, 5A and 40°C
at 48V, 2.5A and 40°C
at 48V, 5A and 25°C
at 48V, 5A and 40°C
at 48V, 5A and 25°C
at 48V, 5A and 40°C; Ground
Benign GB40
at 48V, 5A and 25°C; Ground
Benign GB25

The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime
expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to thecapacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years(131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of adevice. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means thatstatistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit
has been running for 50 000h or only for 100h.

*)Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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11. FUNCTIONAL DIAGRAM
Fig. 11-1 Functional diagram
OutputVoltage
Regulator

L
N

Input Fuse
Input Filter
Input Rectifier
Active Transient Filter &Inrush Current Limiter

Temperature
Shutdown

PFC
Converter

OutputPower
Manager

OutputOverVoltage
Protection

Power
Converter

OutputVoltage
Monitor

VOUT

+
+
-

OutputFilterOverload
LED
DC-ok
LED
DC-ok
Relay

DC-ok
contact

12. TERMINALS AND WIRING
Bi-stable, quick-connect spring clamp terminals. IP20 Finger safe construction. Suitable for field- and factory
installation. Shipped in open position.
Type
Solid wire
Stranded wire
American Wire Gauge
Wire stripping length
Screwdriver
Recommended tightening torquePull-out force

Input
OutputDC-OK-Signal
spring-clamp terminals
spring-clamp terminals
spring-clamp terminals
0.5-6mm2
0.5-6mm2
0.5-6mm2
0.5-4mm2
0.5-4mm2
0.5-4mm220-10 AWG
20-10 AWG
20-10 AWG
10mm / 0.4inch
10mm / 0.4inch
10mm / 0.4inch
not applicable
not applicable
not applicable
not applicable
not applicable
not applicable
10AWG:80N, 12AWG:60N, 14AWG:50N, 16AWG:40N (according to UL486E)

Instructions:a) Use appropriate copper cables that are designed for minimum
operating temperatures of:
60°C for ambient up to 45°C and
75°C for ambient up to 60°C minimum
90°C for ambient up to 70°C minimum.
b) Follow national installation codes and installation regulations!
c) Ensure that all strands of a stranded wire enter the terminal
connection!
d) Up to two stranded wires with the same cross section are
permitted in one connection point (except PE wire).
e) Do not use the unit without PE connection.
f) Unused terminal compartments should be securely tightened.
g) Ferrules are allowed.

Fig. 12-1

Connecting a wire

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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13. FRONT SIDE AND USER ELEMENTS
Fig. 13-1 Front sideA

Input Terminals (Quick-connect spring-clamp terminals)
N, LLine input
PE (Protective Earth) input

B

Output Terminals (Quick-connect spring-clamp terminals, two pins perpole)+
Positive output–
Negative (return) output

C

DC-OK Relay Contact (Quick-connect spring-clamp terminals)
The DC-OK relay contact is synchronized with the DC-OK LED.
See chapter 8 for details.

D Output voltage potentiometer
Multi turn potentiometer;
Open the flap to adjust the output voltage. Factory set: 48.0V
E

DC-OK LED (green)
On, when the output voltage is >90% of the adjusted output voltage

F

Overload LED (red)On, when the voltage on the output terminals is <90% of the adjusted
output voltage, or in case of a short circuit in the output.
Input voltage is required
Flashing, when the unit has switched off due to over-temperature.

Indicators, LEDs
Normal mode
During BonusPower®
Overload (VOUT < 90%)
Output short circuit
Temperature Shut-down
No input power

Overload LED
OFF
OFF
ON
ON
Intermitted
OFF

DC-OK LED
ON
ON
OFF
OFF
OFF
OFF

DC-OK Contact
ClosedClosed
Open
Open
Open
Open

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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14. EMCThe power supply is suitable for applications in industrial environment as well as in residential, commercial and lightindustry environment without any restrictions.
The CE mark indicates conformance with the EMC directive, the low-voltage directive (LVD) and the RoHS directive. A
detailed EMC report is available on request.
EMC Immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)

Surge voltage on input

According generic standards: EN 61000-6-1 and EN 61000-6-2
contact discharge
8kV
EN 61000-4-2
air discharge
15kV
EN 61000-4-3
80MHz-2.7GHz
10V/m
input lines
4kV
EN 61000-4-4
output lines
2kV
DC-OK signal (coupling clamp)
1kV
2kV
EN 61000-4-5
LN
4kV
L  PE, N  PE

Surge voltage on output

EN 61000-4-5

Surge voltage on DC-OK
Conducted disturbance
Mains voltage dips

EN 61000-4-5
EN 61000-4-6
EN 61000-4-11

Voltage interruptions
Voltage sags

EN 61000-4-11
SEMI F47

Powerful transients

VDE 0160

Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A+1kV
Criterion A+ / -  PE
1kV
Criterion A
DC-OK signal  PE
1kV
Criterion A
0.15-80MHz
10V
Criterion A
0% of 100Vac
0Vac, 20ms
Criterion A
40% of 100Vac
40Vac, 200ms
Criterion C
70% of 100Vac
70Vac, 500ms
Criterion A
0% of 200Vac
0Vac, 20ms
Criterion A
40% of 200Vac
80Vac, 200ms
Criterion A
70% of 200Vac
140Vac, 500ms
Criterion A
0% of 200Vac (=0V)
5000msCriterion C
dips on the input voltage according to SEMI F47 standard
80% of 120Vac (96Vac)
1000msCriterion A
70% of 120Vac (84Vac)
500ms
Criterion A
50% of 120Vac (60Vac)
200ms
Criterion A
over entire load range
750V, 1.3ms
Criterion A

Criterions:
A: Power supply shows normal operation behavior within the defined limits.
C: Temporary loss of function is possible. Power supply may shut-down and restarts by itself. No damage or hazards for the power supply
will occur.

According generic standards: EN 61000-6-3 and EN 61000-6-4
EMC Emission
Conducted emission
EN 55011, EN 55032, FCC Part 15, CISPR 11, CISPR 32
Class B
input lines
Conducted emission
limits for DC power port
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
output lines **)according EN 61000-6-3 fulfilled
Radiated emission
EN 55011, EN 55032
Class B
Harmonic input current
EN 61000-3-2
fulfilled for class A equipment
Voltage fluctuations, flicker EN 61000-3-3
fulfilled *)This device complies with FCC Part 15 rules.
Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) thisdevice must accept any interference received, including interference that may cause undesired operation.
*) tested with constant current loads, non-pulsing**) for information only, not mandatory for EN 61000-6-3

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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The power supply has three converters with three different switching frequencies
included. Two are nearly constant. The other one is input voltage and load dependent.
35kHz
nearly constant
105kHznearly constant
40kHz to 220kHz
input voltage and load dependent

Switching Frequencies
Switching frequency 1
Switching frequency 2
Switching frequency 3

15. ENVIRONMENT
Operational temperature *)Storage temperature
Output de-rating
Humidity **)Vibration sinusoidal
Shock
Altitude

Altitude de-rating
Over-voltage category-25°C to +70°C (-13°F to 158°F)-40 to +85°C (-40°F to 185°F)
6W/°C
5 to 95% r.H.
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
2 hours / axis
30g 6ms, 20g 11ms
3 bumps / direction, 18 bumps in total
0 to 2000m (0 to 6 560ft)
2000 to 6000m (6 560 to 20 000ft)

reduce output power according Fig. 15-1
for storage and transportation
60-70°C (140°F to 158°F)
IEC 60068-2-30
IEC 60068-2-6
IEC 60068-2-27
without any restrictions
reduce output power or ambient temperature,
see Fig. 15-2
IEC 62103, EN 50178, overvoltage category II> 2000m (6500ft), see Fig. 15-2
IEC 62103, EN 50178, altitudes up to 2000m
altitudes from 2000m to 6000m
IEC 62103, EN 50178, not conductive

15W/1000m or 5°C/1000m
III
II
2

Degree of pollution*) Operational temperature is the same as the ambient temperature and is defined as the air temperature 2cm below the unit.
**) Do not energize while condensation is present
Fig. 15-1 Output current vs. ambient temp.

Allowed Output
Current at 48V

Allowed Output
Current at 48V

7.5A

7.5A

for typ. 4s

5for typ. 4s

5continuous

2.5
0
-25

Fig. 15-2 Output current vs. altitudecontinuous

2.5
Ambient Temperature

0

20

40

A... Tamb < 60°C
B... Tamb < 50°C
C... Tamb < 40°C

060 70°C

A

0

2000

B

C

Altitude

4000

6000m

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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16. PROTECTION FEATURES
Output protection
Output over-voltage protection

Degree of protection
Penetration protection
Over-temperature protection
Input transient protection
Internal input fuse*)

Electronically protected against overload, no-load and short-circuits *)typ. 58Vdc
In case of an internal power supply defect, a redundantmax. 60Vdc
circuit limits the maximum output voltage. The output
shuts down and automatically attempts to restart.
IP 20
EN/IEC 60529> 3.5mme.g. screws, small partsyes
Output shut-down with automatic restart
MOV (Metal Oxide Varistor)
T6.3A H.B.C.
not user replaceable

In case of a protection event, audible noise may occur.

17. SAFETY FEATURES
Input / output separation *)Class of protection
Isolation resistancePE resistance
Touch current (leakage current)

*)

SELV
IEC/EN 60950-1
PELV
IEC/EN 60204-1, EN 50178, IEC 62103, IEC 60364-4-41
double or reinforced insulation
I
PE (Protective Earth) connection required> 5MOhm
input to output, 500Vdc< 0.1Ohm
typ. 0.19mA / 0.44mA
100Vac, 50Hz, TN-,TT-mains / IT-mains
typ. 0.29mA / 0.65mA
120Vac, 60Hz, TN-,TT-mains / IT-mains
typ. 0.53mA / 1.04mA
230Vac, 50Hz, TN-,TT-mains / IT-mains< 0.25mA / 0.54mA
110Vac, 50Hz, TN-,TT-mains / IT-mains< 0.38mA / 0.79mA
132Vac, 60Hz, TN-,TT-mains / IT-mains< 0.74mA /1.29mA
264Vac, 50Hz, TN-,TT-mains / IT-mains

double or reinforced insulation

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Q-Series

18. DIELECTRIC STRENGTH
The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by
the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies thevoltage with a slow ramp (2s up and 2s down). Connect all input-terminals together as well as all output poles before
conducting the test. When testing, set the cut-off current settings to the value in the table below.
Type test

60s

A
2500Vac

Factory test

5s

2500Vac

2500VacField test

5s

2000Vac

2000Vac

500Vac

500Vac> 10mA> 10mA> 20mA> 1mA

Fig. 18-1 Dielectric strength

Input

DC-ok
B*)

L
N

Cut-off current setting
B

A

D
OutputEarth, PE
C

+

-

B
3000Vac

C
500VacD
500Vac

500Vac

500VacTo fulfil the PELV requirements according to EN60204-1 § 6.4.1, werecommend that either the + pole, the – pole or any other part ofthe output circuit shall be connected to the protective earthsystem. This helps to avoid situations in which a load starts
unexpectedly or cannot be switched off when unnoticed earth
faults occur.

B*) When testing input to DC-OK ensure that the max. voltage between DC-OK and the output is not exceeded (column D). We recommend
connecting DC-OK pins and the output pins together when performing the test.

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Q-Series

19. APPROVALS AND FULFILLED STANDARD
UL 508

IEC 61010

IEC 60950-1

UL 60950-1

Class I Div 2

Marine (DNV GL)

Marine (ABS)IEC 60068-2-60

ISA-71.04-1985

VDMA 24364

UL Certificate
Listed equipment for category NMTR - Industrial Control Equipment
Applicable for US and Canada
E-File: E198865
CB Scheme Certificate
IEC 61010-2-201 Electrical Equipment for Measurement, Control andLaboratory Use - Particular requirements for control equipment
CB Scheme Certificate
General safety requirements for Information Technology Equipment (ITE)UL Certificate
Recognized component for category QQGQ - Information Technology
Equipment (ITE)
Applicable for US and Canada
E-File: E137006
CSA Certificate
Power Supplies for Hazardous Location
Applicable for Canada and US
CSA Class: 5318-01 (Canada), 5318-81 (USA)
Temperature Code: T3
Groups: A, B, C and D
DNV-GL Certificate
DNV-GL Type approved product
Certificate: TAA00002JT
Temperature: Class D
Humidity: Class B
Vibration: Class C
EMC: Class A
Enclosure: Class A
ABS Design Assessment Certificate
ABS (American Bureau of Shipment) assessed product
Certificate: 17-HG1599236-PDA
Manufacturer's Declaration (Online Document)
Environmental Tests, Flowing Mixed Gas Corrosion Test
Test Ke - Method 4
H2S: 10ppb
NO2: 200ppb
Cl2: 10ppb
SO2: 200ppb
Test Duration: 3 weeks, which simulates a service life of at least 10 years
Manufacturer's Declaration (Online Document)
Airborne Contaminants Corrosion Test
Severity Level: G3 Harsh
H2S: 100ppb
NOx: 1250ppb
Cl2: 20ppb
SO2: 300ppb
Test Duration: 3 weeks, which simulates a service life of at least 10 years.
Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364-C1-L/W for
solvents and water-based paints

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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20. REGULATORY COMPLIANCE
EU Declaration ofConformity

REACH Directive

EAC TR Registration

The CE mark indicates conformance with the- EMC directive- Low-voltage directive (LVD)- RoHS directive
Manufacturer's Statement
EU-Directive regarding the Registration, Evaluation, Authorisation
and Restriction of Chemicals
Registration for the Eurasian Customs Union market(Russia, Kazakhstan, Belarus)

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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21. PHYSICAL DIMENSIONS AND WEIGHT
WeightDIN-Rail

Installation Clearances

900g / 1.98lb
Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN-rail height must be added to the unit depth (117mm) to calculate the total required
installation depth.
See chapter 2

Fig. 20-1 Front viewFig. 20-2 Side viewNov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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22. ACCESSORIES

22.1. ZM1.WALL WALL MOUNTING BRACKETThis bracket is used to mount the power
supply onto a flat surface without utilizing
a DIN-Rail.

22.2. ZM13.SIDE SIDE MOUNTING BRACKETThis bracket is used to mount Dimension units sideways with or without utilizing a DIN-Rail. The two aluminum
brackets and the black plastic slider of the unit have to be detached, so that the steel brackets can be mounted.
For sideway DIN-rail mounting, the removed aluminum brackets and the black plastic slider need to be mounted on
the steel bracket.

Side mounting with DIN-rail brackets

Side mounting without DIN-rail brackets

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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48V, 5A, SINGLE PHASE INPUT

Q-Series22.3. UF20.481 BUFFER MODULE
This buffer unit is a supplementary device for DC 48V power supplies. It delivers power tobridge typical mains failures or extends the hold-up
BufferPowertime after turn-off of the AC power. In times when
Load
AC
Unit(s)Supplythe power supply provides sufficient voltages, thebuffer unit stores energy in integrated electrolytic+DC
capacitors. In case of mains voltage fault, this energy
is released again in a regulated process. One buffer
module can deliver 20A additional current.
The buffer unit does not require any control wiring. It can be added in parallel to the load
circuit at any given point. Buffer units can be added in parallel to increase the output
ampacity or the hold-up time.

22.4. YR2.DIODE REDUNDANCY MODULEThe YR2.DIODE is a dual redundancy module, which has two diodes
as decoupling devices included. It
can be used for various purposes.
The most popular application is toconfigure highly reliable and true
redundant power supply systems.
Another interesting application is
the separation of sensitive loads
from non-sensitive loads. Thisavoids the distortion of the power
quality for the sensitive loads
which can cause controller failures.

FailureMonitor++ - 48V,5A

Adj
DCok
Overload

QS10.481
Power
SupplyL N PE+- +-IN 1 IN 2

YR2.Diode

Redundancy
Module++ - 48V,5A

Adj
DCok
Overload

QS10.481
Power
SupplyOUT

L N PE+ -optional
I

I

48V,5A
Load

L
N
PE

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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23. APPLICATION NOTES
23.1. REPETITIVE PULSE LOADING
Typically, a load current is not constant and varies over time. This power supply is designed to support loads with ahigher short-term power demand (=BonusPower®). The short-term duration is hardware controlled by an output
power manager and is available on a repeated basis. If the BonusPower® load lasts longer than the hardware
controller allows it, the output voltage will dip and the next BonusPower® is available after the BonusPower® recovery
time (see chapter 6) has elapsed.
To avoid this, the following rules must be met:a) The power demand of the pulse must be below 150% of the nominal output power.
b) The duration of the pulse power must be shorter than the allowed BonusPower® time. (see output section)c)
The average (R.M.S.) output current must be below the specified continuous output current.
If the R.M.S. current is higher, the unit will respond with a thermal shut-down after a period of time. Use themaximum duty cycle curve (Fig. 22-2) to check if the average output current is below the nominal current.
Fig. 22-1 Repetitive pulse loads, definitions

Fig. 22-2 Max. duty cycle curve

1.0

PPEAK TPEAK

DutyCycle

max.
150%

0.6

100%

0.4

P0

P0 = 100%

0.2
0
100

P0
PPEAK
T0
TPEAK

Example:P0 = 10%
P0 = 50%
P0 = 75%

0.8

T0Base load (W)Pulse load (above 100%)
Duration between pulses (s)Pulse duration (s)110DutyCycle =
T0 =

120

130

PPEAK
140

150%

Tpeak
Tpeak + T0

Tpeak - (DutyCycle x Tpeak)
DutyCycle

A load is powered continuously with 120W (= 50% of the rated output load). From time to time a peak
power of 360W (= 150% of the rated output load) is needed for 1 second.
The question is: How often can this pulse be supplied without overloading the power supply?
- Make a vertical line at PPEAK = 150% and a horizontal line where the vertical line crosses the P0 = 50%
curve. Read the max. duty cycle from the duty cycle-axis (= 0.37)- Calculate the required pause (base load) length T0:- Result: The required pause length = 1.7s

T0=

- Max. repetition rate = pulse +pause length = 2.7s

Tpeak - (DutyCycle x Tpeak)
DutyCycle=

1s - (0.37 x 1s)
0.37= 1.7sMore examples for pulse load compatibility:
PPEAK
360W
360W
300W

P0
240W
0W
120W

TPEAK
1s
1s
1s

T0
>25s
>1.3s
> 0.75s

PPEAK
360W
360W
360W

P0
120W
120W
120W

TPEAK
0.1s
1s
3s

T0
>0.16s
>1.6s>4.9s

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Q-Series23.2. PEAK CURRENT CAPABILITY
Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up coil. The inrush current
demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal
output current (including the PowerBoost). The same situation applies when starting a capacitive load.
Branch circuits are often protected with circuit breakers or fuses. In case of a short or an overload in the branch circuit,the fuse needs a certain amount of over-current to trip or to blow. The peak current capability ensures the safe
operation of subsequent circuit breakers.
Assuming the input voltage is turned on before such an event, the built-in large sized output capacitors inside thepower supply can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:
Fig. 22-3 Peak load with 2x the nominal
current for 50ms, typ.

Fig. 22-4 Peak load with 4x the nominal
current for 5ms, typ.

Peak load 10A (resistive) for 50ms
Output voltage dips from 48V to 42V.

Peak load 20A (resistive) for 5ms
Output voltage dips from 48V to 36V.

Please note: The DC-OK relay triggers when the voltage dips more than 10% for longer than 1ms.

23.3. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply.
It does not matter whether the power supply is on or off.
The maximum allowed feed-back-voltage is 58Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 6.

23.4. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 20A. An external protection is only required if the supplying
branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local
regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 6A B- or 4A C-Characteristic breaker should be used

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series23.5. CHARGING OF BATTERIESThe power supply can be used to charge lead-acid or maintenance free batteries. (Four 12V batteries in series)
Instructions for charging batteries:a)

Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge
voltage.
End-of-charge voltage

55.6V

55.0V

54.3V

53.6V

Battery temperature

10°C

20°C

30°C

40°C

b)

Use a 10A circuit breaker (or blocking diode) between the power supply and the battery.

c)Ensure that the output current of the power supply is below the allowed charging current of the battery.

d)Use only matched batteries when putting 12V types in series.

e)

The return current to the power supply (battery discharge current) is typ. 4mA when the power supply is switchedoff (except in case a blocking diode is utilized).

23.6. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCB’s or UL1077 circuit breakers) are commonly used for AC-supply systems andmay also be used on 48V branches.
MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to
the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not.
To avoid voltage dips and under-voltage situations in adjacent 48V branches which are supplied by the same source, afast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly tothe ride-through time of PLC's. This requires power supplies with high current reserves and large output capacitors.
Furthermore, the impedance of the faulty branch must be sufficiently small in order for the current to actually flow.
The best current reserve in the power supply does not help if Ohm’s law does not permit current flow. The following
table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending on the wire crosssection and wire length.
Fig. 22-5 Test circuit

Power Supply

AC

MCB

+
Wire length

DC S1... Fault simulation switch

*)

Load

+
S1

-

Maximal wire length*) for a fast (magnetic) tripping:
0.75mm²
1.0mm²1.5mm²2.5mm²
58m
64m
104m
143m
C-2A
41m
53m
73m
124m
C-3A
18m
31m
54m
94m
C-4A
10m
14m
21m
33m
C-6A
4m
6m
8m
13m
C-8A
3m
4m
7m
10m
C-10A
19m
28m
39m
75m
B-6A
8m
12m
16m
29m
B-10A
7m
9m
13m
23m
B-13A

Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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25/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

23.7. PARALLEL USE TO INCREASE OUTPUT POWER

Unit A

Power supplies from the same series (Q-Series) can be paralleled to increase
the output power. The output voltage shall be adjusted to the same value(±100mV) with the same load conditions on all units, or the units can be left
with the factory settings.

AC

If more than three units are connected in parallel, a fuse or circuit breakerwith a rating of 6A or 10A is required on each output. Alternatively, a diode or
redundancy module can also be utilized.

Unit B

+
-

DC

+
Load

AC

+
-

-

Keep an installation clearance of 15mm (left / right) between two powerDC
supplies and avoid installing the power supplies on top of each other. Do not
use power supplies in parallel in mounting orientations other than the standard mounting orientation (input terminals
on bottom and output terminals on the top of the unit) or in any other condition where a derating of the output
current is required (e.g. altitude, above 60°C, …).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

23.8. PARALLEL USE FOR REDUNDANCYPower supplies can be paralleled for redundancy to gain higher
system availability. Redundant systems require a certain amount of
extra power to support the load in case one power supply unit fails.
The simplest way is to put two power supplies in parallel. This iscalled a 1+1 redundancy. In case one power supply unit fails, theother one is automatically able to support the load current without
any interruption. Redundant systems for a higher power demand
are usually built in a N+1 method. E.g. five power supplies, each
rated for 5A are paralleled to build a 20A redundant system. For
N+1 redundancy the same restrictions apply as for increasing theoutput power, see also section 22.7.
Please note: This simple way to build a redundant system does notcover failures such as an internal short circuit in the secondary sideof the power supply. In such a case, the defective unit becomes aload for the other power supplies and the output voltage can not
be maintained any more. This can be avoided by utilizing
decoupling diodes which are included in the redundancy module
YR2.DIODE.

FailureMonitor++ - 48V,5A

Adj
DCok
Overload

QS10.481
Power
SupplyL N PE+- +-IN 1 IN 2

YR2.Diode

Redundancy
Module++ - 48V,5A

Adj
DCok
Overload

QS10.481
Power
SupplyOUT

L N PE+ -optional
I

I

48V,5A
Load

L
N
PE

Recommendations for building redundant power systems:
a)
b)
c)

Use separate input fuses for each power supply.
Monitor the individual power supply units. Therefore, use the DC-OK relay contact of the QS10 power supply.
It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

23.9. DAISY CHAINING OF OUTPUTS
Daisy chaining (jumping from one power supply output to the next) is allowed as long as the average output current
through one terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal block asshown in Fig. 22-7.
Fig. 22-6 Daisy chaining of outputs

Fig. 22-7 Using distribution terminals

max 25A!
OutputOutput

+ + -

+ + -

-

-

+

-

Load

OutputOutput

+ + -

+ + -

-

-

Power
SupplyPower
SupplyPower
SupplyPower
Supply

Input

Input

Input

Input

23.10. SERIES OPERATION

-

+

Load

Distribution
Terminals

Unit AACPower supplies of the same type can be connected in series for higher
output voltages. It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed 150Vdc. Voltages
with a potential above 60Vdc are not SELV any more and can be dangerous.
Such voltages must be installed with a protection against touching.

DC

+
+

Unit BAC

Earthing of the output is required when the sum of the output voltage isabove 60Vdc.

DC

Avoid return voltage (e.g. from a decelerating motor or battery) which isapplied to the output terminals.

Load

+
-

Earth
(see notes)

Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power
supplies on top of each other. Do not use power supplies in series in mounting orientations other than the standard
mounting orientation (input terminals on bottom and output terminals on the top of the unit).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

23.11. INDUCTIVE AND CAPACITIVE LOADSThe unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series23.12. OPERATION ON TWO PHASESPower Supply

L1
240V +15% max.

The power supply can also be used on two-phases of a three-phase-system.
Such a phase-to-phase connection is allowed as long as the supplying
voltage is below 240V+15%. Use a fuse or a circuit breaker to protect the N
input. The N input is internally not protected and is in this case connected toa hot wire. Appropriate fuses or circuit breakers are specified in section 22.4
“External Input Protection”.

L3

AC
L
Fuse

L2

internal
fuse

N
PE
DC

23.13. USE IN A TIGHTLY SEALED ENCLOSURE
When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than outside. In such situations, the inside temperature defines the ambient temperature for the power supply.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The power supply is placed in the middle of the box, no other heat producing items are inside the box
Enclosure:
Load:
Input:
Temperature inside enclosure:
Temperature outside enclosure:
Temperature rise:

Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm
48V, 4A; (=80%) load is placed outside the box
230Vac
49°C (in the middle of the right side of the power supply with a distance of 2cm)
27.2°C
21.8K

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

28/29

QS10.481, QS10.481-D1
48V, 5A, SINGLE PHASE INPUT

Q-Series

23.14. MOUNTING ORIENTATIONSMounting orientations other than input terminals on the bottom and output on the top require a reduction incontinuous output power or a limitation in the maximum allowed ambient temperature. The amount of reduction
influences the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous
operation can be found below:
Curve A1
Curve A2

Recommended output current.
Max allowed output current (results in approximately half the lifetime expectancy of A1).

Fig. 22-8
Mounting
Orientation A(Standardorientation)

Output Current

5A

OUTPUT

A1

3.75
Power
Supply2.5
1.25
Ambient Temperature

0

INPUT

10
Fig. 22-9
Mounting
Orientation B(Upside down)

20

30

40

50

60°C

Output Current

5A
3.75

A2

2.5

A1

INPUT

Power
Supply1.25
Ambient Temperature

0

OUTPUT

10
Fig. 22-10
Mounting
Orientation C(Table-top
mounting)

20

30

50

40

60°C

Output Current

5A
3.75

A2
A1

2.5
1.25

Ambient Temperature

0
10

40

50

60°C

5A
OUTPUT

Power
Supply

3.75

A2

2.5

A1

1.25
Ambient Temperature

0
10

20

30

50

40

60°C

Output Current

3.75
INPUT

Power
Supply5A
OUTPUT

Fig. 22-12
Mounting
Orientation E(Horizontal ccw)

30

Output Current

INPUT

Fig. 22-11
Mounting
Orientation D(Horizontal cw)

20

A2
A1

2.5
1.25

Ambient Temperature

0
10

20

30

40

50

60°C

Nov. 2020/ Rev. 2.3 DS-QS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

29/29