YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

MOSFET REDUNDANCY MODULE










For 1+1 Redundancy with automated load sharing
Dual input with single output
Redundancy OK signal included which reports the lossof redundancy
160% (32.5A) Peak load capability
Reverse input polarity protection
Full power between -40°C and +70°C
Width only 32mm
Rugged metal housing
Easy Wiring:
Distribution terminal for negative pole included

PRODUCT DESCRIPTIONSHORT-FORM DATAThe YR20.246 is a redundancy module for building
redundant power supply systems. It is equipped with two
input channels and one output. The two inputs aredecoupled by MOSFET technology.

Input voltage
DC 24-28V
Input voltage range 18-35Vdc
Input current
2x 0-12A
2x 0-10A
Output current
0-24A
0-20A
max. 26A

The device is equipped with an automated load sharing
feature, which can compensate a small voltage imbalance
between the power supplies connected to the inputs inorder to achieve an even current share. It also monitors thefunction of the redundancy circuitry and provides a signal
in case of a failure or a high output current, which could
prevent redundancy if one power supply fails. If thisfeature is not required, the YR20.242 is available.
The redundancy utilizes MOSFETs instead of diodes for thedecoupling of the two input channels. This reduces theheat generation and the voltage drop between input andoutput. The redundancy module does not require an
additional auxiliary voltage.
Due to the low power losses, the unit is very slender andonly requires 32mm width on the DIN rail. Largeconnection terminals allow for a safe and fast installation.
The large international approval package makes this unit
suitable for nearly every application

ORDER NUMBERS

Input to output
voltage drop
Power losses

Temperature range
Dimensions
Weight±25%

ambient <+45°C
ambient <+70°C
ambient <+45°C
ambient <+70°C
in overload*) or
short circuit mode
0.1-0.5V**)
input: 2x5A
0.2-0.5V**)
input: 2x10A
1.7W
at no load
2.6-4.7W**)
input: 2x5A
5.6-8.7W**)
input: 2x10A-40°C to +70°C operational
32x124x117mm WxHxD
310g, 0.69lb*) Currents at voltages below 6V**) Depending on load share function

MAIN APPROVALS
For details and the complete approval list, see chapter 17.

Redundancy
ModuleYR20.246

Accessory

ZM11.SIDEUL 508

UL 60950-1

ATEX

IECEx

Class I Div 2Side mount bracket

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

INDEX
Page
1. Intended Use .......................................................3
2. Installation Instructions ......................................3
3. Input and Output Characteristics .......................5
4. Power Losses ........................................................6
5. Lifetime Expectancy and MTBF...........................6
6. Terminals and Wiring ..........................................7
7. Functional Diagram .............................................7
8. Front Side and User Elements .............................8
9. “Redundancy OK” Relay Contact .......................910. “Load Share OK” Relay Contact .........................9
11. Automated Load Sharing..................................10
12. EMC ....................................................................11
13. Environment ......................................................12
14. Protection Features ...........................................13
15. Safety Features ..................................................13Page
16. Dielectric Strength ............................................ 13
17. Approved, Fulfilled or Tested Standards ......... 14
18. Regulatory Product Compliance ...................... 15
19. Physical Dimensions and Weight ..................... 16
20. Accessories ........................................................ 17
20.1. ZM11.SIDE - Side Mounting Bracket ........ 17
21. Application Notes ............................................. 18
21.1. Using Only One Input Instead of BothChannels ............................................................... 18
21.2. Recommendations for Redundancy......... 19
21.3. Inductive and Capacitive Loads................ 19
21.4. Sideward Installation Clearances ............. 19
21.5. 1+1 Redundancy up to 10A ...................... 20
21.6. Mounting Orientations ............................ 21

The information given in this document is correct to the best of our knowledge and experience at the time of publication. If not
expressly agreed otherwise, this information does not represent a warranty in the legal sense of the word. As the state of ourknowledge and experience is constantly changing, the information in this data sheet is subject to revision. We therefore kindly ask
you to always use the latest issue of this document (available under www.pulspower.com). No part of this document may be
reproduced or utilized in any form without our prior permission in writing.

TERMINOLOGY AND ABREVIATIONS
DC 24VA 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)24Vdc

A figure with the unit (Vdc) at the end is a momentary figure without any additional
tolerances included.

may

A key word indicate flexibility of choice with no implied preferenceshall

A key word indicate a mandatory requirement

shouldA key word indicate flexibility of choice with a strongly preferred implementation

1+1 Redundancy

Use of two identical power supplies in parallel to provide continued
operation following most failures in a single power supply. The two power
supply outputs should be isolated from each other by utilizing diodes orother switching arrangements. E.g. two 10A power supplies are needed toachieve a 10A redundant system.

AC

AC
DC

DC

IN 1 IN 2

+

OUT

-

Load

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

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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.
The redundancy module can be used with any type of power supply as long as the maximum output current ratings
are not exceeded. It is suitable for power supplies with continuous overload current as well as any kind of intermittent(Hiccup) overload behavior.

2. INSTALLATION INSTRUCTIONSWARNING

Risk of electrical shock, fire, personal injury or death.

- Turn power off before working on the device and protect against inadvertent re-powering.
- Do not open, modify or repair the device.
- Use caution to prevent any foreign objects from entering into 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 surface may cause burns.
Obey the following installation instructions:This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to
the factory for inspection.
Install the device in an enclosure providing protection against electrical, mechanical and fire hazards.
Do not ground or earth the positive output pole which could prevent redundancy in case of a ground failure. Groundthe negative output pole, when needed.
Use only power supplies with a negligible output ripple voltage in the low frequency range between 50Hz and 10kHz
when used in marine applications according to the GL regulations.
Install the device onto a DIN rail according to EN 60715 with the output 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.
Unused screw terminals should be securely tightened.
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 input must be powered from a PELV or SELV source or an “Isolated Secondary Circuit” in order to maintain a SELVor PELV output.
Check correct input polarity. The device will not operate when input voltage is reversed.
The device is designed as “Class of Protection III” equipment according to IEC 61140.
A PE (ground) connection is not required. However, connecting the chassis ground terminal to ground can bebeneficial to gain a high EMI immunity.
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 6000m (19685ft). See additional requirements in the product datasheet for
use above 2000m (6560ft).
Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

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 heat source. When the device is permanently loaded withless than 50%, the 5mm can be reduced to zero. Under special circumstances clearances can be reduced. See details in
the product datasheet.
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.
To ensure a proper load share function, ensure that the wiring size and length between the two power supplies andthe redundancy module is identical.
Installation Instructions for Hazardous Location Areas
The device is suitable for use in Class I Division 2 Groups A, B, C, D locations and for use in Group II Category 3 (Zone 2)
environments.
Hazardous Location classification: ATEX: EPS 11 ATEX 1 312 X, II 3G EX ec nC IIC T4 Gc
WARNING EXPLOSION HAZARDS!
Substitution of components may impair suitability for this environment.
Do not disconnect the device unless power has been switched off or the area is known to be non-hazardous.
A suitable enclosure must be provided for the end product which has a minimum protection of IP54 and fulfils therequirements of the EN 60079-0.

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

3. INPUT AND OUTPUT CHARACTERISTICS
Number of inputs
Number of outputs
Input voltage
Input voltage range
Voltage drop, input to output

Input current

Output current

Reverse current
Reverse voltage
Output capacitance
1)

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

2
1
DC 24-28V ±25%
18-35Vdc
0.1-0.5V
0.2-0.5V
0.24-0.5V
2x 0-12A
2x 0-10A
2x 17A 1)
2x 700A
24A
20A
32.5A
26A

max.
max.
typ.

1mA
40Vdc
320µF

nom.

at 2x5A, load share function dependent, see Fig. 3-1
at 2x10A, load share function dependent, see Fig. 3-1
at 2x12A, load share function dependent, see Fig. 3-1
continuous, ambient temperature < +45°C
continuous, ambient temperature < +70°C
for max. 5 seconds
for max. 1ms
continuous, ambient temperature < +45°C
continuous, ambient temperature < +70°C
for max. 5 secondsin overload /short-circuit (voltage < 6V). Ensure that thesum of input currents does not exceed this value.
at 24V, per input, -40°C to +70°C
voltage applied to the output, continuously allowed

The average value (R.M.S. value) of the output current must not exceed the values of the continuous output current.
Fig. 3-1 Input to output voltage drop

Fig. 3-2 Test setup for voltage drop measurements

Voltage Drop, typPowerSupply600mV

24V, 12A +

500mV
400mV
300mV
200mV

Depending on
Load ShareRegulation-

Output: 0
Input: 0

V U1

OutputYR20.246

IOUT
A

Input 1

OutputVariable
Load,
0-24A

UOUT V

60°C
25°C

Power
Supply24V, 12A +

100mV
0mV

I1
A

Input / Output Current

25A
5A
15A
20A
10A
2x2.5A 2x5A 2x7.5A 2x10A 2x12.5A

I1 = I2

I2
AV U2

Input 2

Voltage Drop = U1 - UOUT

U1 = U2

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

4. POWER LOSSESPower losses

2.6-4.7W
5.6-8.7W
1.7W

typ.
typ.
typ.

Standby power losses
Fig. 4-1 Power losses
Power Losses, typ

12W

10W
8W

Depending on
Load ShareRegulation

Fig. 4-2 Test setup for power loss measurements
25/
60°C

24V, 12A +

60°C

I1
A
V U1

-

Power
Supply4W

24V, 12A +2W
Output: 0
Input: 0Power
SupplyOutputYR20.246

IOUT
A

Input 1

OutputVariable
Load,
0-24A

UOUT V

25°C

6W

0

at 2x5A, 25°C ambient temperature
at 2x10A, 25°C ambient temperature
at no output current

Input / Output Current

25A
15A
5A
20A
10A
2x2.5A 2x5A 2x7.5A 2x10A 2x12.5A

I1 = I2

I2
AV U2

Input 2U1 = U2

Losses = ( U1 * I1 + U2 * I2 ) - UOUT * IOUT

5. LIFETIME EXPECTANCY AND MTBF
The redundancy module has two input channels which are completely independent from each other. Each control
circuit, auxiliary voltage source, or other circuitry in the module are designed separately for each input. The dual input
redundancy module can be considered as two single redundancy modules combined together in one housing. The only
common point is the circuit trace that ties the two separate circuits together at the output.
The MTBF figures below are for the entire dual input module. If the MTBF number of only one path is needed, simply
double the value from the table.
Input / output current
conditions
Lifetime expectancy*)
MTBF**) SN 29500, IEC 61709
MTBF**) MIL HDBK 217F

Input: 2x5A
Output: 10A
372 000h *)1 053 000h *)2 306 000h
3 913 000h
964 000h
1 379 000h
278 000h
381 000h

Input: 2x10A
Output: 20A
182 000h *)516 000h *)1 954 000h
3 359 000h
858 000h
1 226 000h
243 000h
330 000h

at 24V and 40°C
at 24V and 25°C
at 24V and 40°C
at 24V and 25°C
Ground Fixed GF40 (24V and 40°C)
Ground Fixed GF25 (24V and 25°C)
Ground Benign GB40 (24V and 40°C)
Ground Benign GB25 (24V and 25°C)

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.

*)Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

6. TERMINALS AND WIRING
Input and Output
Screw termination
IP20 Finger safe construction.
Suitable for field installation.
max. 6mm2
max. 4mm2
20-10 AWG
2.8mm (including ferrule)
7mm / 0.28inch
3.5mm slotted or Pozidrive No 2
0.8Nm, 7lb.in

Type

Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter
Wire stripping length
Screwdriver
Recommended tightening torqueSignals
Push-in terminals

max. 1.5mm2
max. 1.5mm2
AWG 24-16
max. 1.6mm (including ferrules)
7mm / 0.28inch
not required
not applicable

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 and
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) Screws of unused terminal compartments should be securely tightened.
e) Ferrules are allowed.

7. FUNCTIONAL DIAGRAM
Fig. 7-1 Functional diagram
Input 1

OK

Input 2

Load ShareController
Input
Voltages
Monitor

13

Load Share OK
Contact
14
5A Output current
10A
20A alarm threshold
Output current < IN

Load ShareOK

Output Current
MonitorRedundancy OK

Redundancy OK
Controller
Control

RedundancyOK

23 Redundancy OK
Contact
24

+

+

-

-

Input 1ChassisGround+Input 2-

OutputControl

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

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8. FRONT SIDE AND USER ELEMENTS
Fig. 8-1 Front sideA

Output terminal (screw terminals)

B Chassis-Ground terminal
Connection of the chassis is optional and not required since the unit fulfils therequirements according to protection class III.
C

Input terminals for input 1 (screw terminals)

D Input terminals for input 2 (screw terminals)
E

Selector for output current warning threshold
If the output current increases, e. g. due to additionally loads, and exceeds thenominal current of one power supply unit, redundancy is no longer guaranteed.
To avoid the loss in redundancy, the output current is monitored and isreported through LEDs and relay contacts when exceeding the predefinedvalue.
- Set the selector to 5A in combination with two 5A power supplies (1+1 red.)- Set the selector to 10A in combination with two 10A power supplies (1+1 red.)- Set the selector to 20A for n+1 redundant system. With this setting,redundancy cannot be checked by the redundancy module anymore.
Exceeding the current by less than 2 seconds will be ignored.

F

Green LED “Output current < IN”
The LED is on solid when the output current is smaller than the adjusted valueof the output current alarm selector (E).

G Load share LEDs
The three LEDs indicate the status of the load sharing between the two power
supplies.
See chapter 11 for detailed description.
H Green LED “Redundancy OK”
The LED is on solid when no errors are detected.
Errors:- One or both input voltages are out of range (below 22V or above 30V).
- Output current is higher than the adjusted value of the output current
threshold setting.
- Internal defect is detected
I

Relay contact “Redundancy OK” (push-in terminals)
The relay contact is closed when no redundancy errors are detected. The relay
contact is also synchronized with the “Redundancy OK” LED.
See chapter 9 for contact ratings.

J

Relay contact “Load share OK” (push-in terminals)
The relay contact is closed when the output voltage of the two power supplies
are sufficiently adjusted.
Deviations less than 2s will be ignored.
See chapter 11 for detailed description.
See chapter 10 for contact ratings.

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

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9. “REDUNDANCY OK” RELAY CONTACT
This feature reports the loss of redundancy by opening the relay contact (pin 23 and 24).
Contact is closed
Contact is open

Contact ratings
Isolation voltage

When no errors are detectedWhen:- one or both input voltages are below 22Vdc or above 30Vdc.
- the output current is higher than the adjusted value of the output current threshold setting.
- an internal defect of the redundancy module is detected (decoupling measures and several
internal test routines).
Input voltage errors less than 2s will be ignored.
Overcurrent errors (less than 150% of the adjusted value) less than 4s will be ignored.
Overcurrent errors (above 150% of the adjusted value) less than 30ms will be ignored.
Internal errors less than 10s will be ignoredmax.
60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A
resistive loadmin.
1mA at 5Vdc
minimum permissible load
See dielectric strength table in chapter 16.

10. “LOAD SHARE OK” RELAY CONTACT
This feature monitors if the output voltages of the two power supplies connected to the input are sufficiently adjusted
for an even current distribution. The relay contact (pin 13 and 14) is closed, when load sharing occurs.
Contact is closed
Contact is open

Contact ratings
Isolation voltage

When the adjustment of the output voltages are sufficient
When an even load share does not occur, and readjustment of the output voltages isrecommended.
Details see chapter 11.
max.
60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A
resistive loadmin.
1mA at 5Vdc
minimum permissible load
See dielectric strength table in chapter 16.

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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24-28V, 20A, DUAL REDUNDANCY MODULE

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11. AUTOMATED LOAD SHARING
Drawing even current from both power supplies in a redundancy application can provide a longer service life of theredundant power supply system. An evenly shared current can avoid that one of the two units is getting much hotter
than the other, which reduces the lifetime of the power supply system. The YR20.246 redundancy module is equippedwith an automated load share feature, which can compensate a certain voltage unbalance between the two power
supplies connected to the inputs.
However, to reduce the losses of the active circuit in the redundancy module, the individual output voltages shall be
set as close as possible. The three LEDs on the front of the unit help to indicate if adjustment is necessary.
Fig. 11-1 Load sharing
Optimal load sharing andminimal power losses

Input 1+

To optimize power losses, reduce the output voltageof the power supply, where the yellow LED is on.

Input 1+
OK

Input 1
+

OK

OK

+
Input 2

Reduce output voltageof power supply 1

VOUT1 > VOUT2+
Input 2+
Input 2

typ. 370mV
typ. 90mV

VOUT1 = VOUT2

typ. 90mV
Input 1+
OK+
Input 2

typ. 370mV
Input 1+
OK

Input 1++
Input 2

OK+
Input 2

Automated load sharing possible

VOUT1 < VOUT2Reduce output voltageof power supply 2

Automated load sharing not possible"Load Share OK" contact is closed"Load Share OK" contact is open

The active load share feature of the YR20.246 has a similar effect and benefit as the feature “Parallel Mode” (softoutput characteristic), which is available on larger PULS power supplies.

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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Y-Series

24-28V, 20A, DUAL REDUNDANCY MODULE

12. EMCThe redundancy module is suitable for applications in industrial environment as well as in residential, commercial andlight industry environment without any restrictions.
EMC Immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)

Surge voltage on input
lines
Surge voltage on output
lines
Surge voltage on signal
lines
Conducted disturbancePower-frequency magnetic
field 1)

According to 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
2kV
EN 61000-4-4
Output lines
2kV
Redundancy OK signal 2)
2kV
Load share OK signal 2)
2kV+500VEN 61000-4-5
1kV+/-  Chassis ground+500VEN 61000-4-5
1kV+/-  Chassis ground
Load Share OK signal PE
1kV
EN 61000-4-5
Redundancy OK signal
1kV
EN 61000-4-6
0.15-80MHz
20V
EN 61000-4-8
50Hz
30A/m

Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A

Criterions:
A: Redundancy module shows normal operation behavior within the defined limits.
Notes:
1) A test is not applicable according to EN 61000-6-2, since the device does not contain components susceptible to magnetic fields, e.g. hallelements, electrodynamic microphones, etc.
2) Tested with capacitive coupling clamp.

According to generic standards: EN 61000-6-3 and EN 61000-6-4
EMC Emission
limits for DC power ports according
Conducted emission
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
EN 61000-6-3 fulfilled 3) 4)
input lines
limits for DC power ports according
Conducted emission
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
EN 61000-6-3 fulfilled 3) 4)
output lines
Radiated emission
EN 55011, EN 55032
Class B 4)
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.
Notes:
3) For information only, not mandatory for EN 61000-6-3.
4) Provided, that power sources connected on the inputs fulfill the requirements too.

Switching frequency
The internal auxiliary supply is generated with a boost converter.
The switching frequency varies from 140kHz to 500kHz depending on the input voltage.

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

13. ENVIRONMENT
Operational temperature *)Storage temperature
Humidity **)Vibration sinusoidal***)Shock***)
Altitude-40°C to +70°C (-40°F to 158°F)-40 to +85°C (-40°F to 185°F)
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)

Altitude derating
Over-voltage category

1.25A/1000m or 5°C/1000m
not applicable

Degree of pollution

2

for storage and transportation
IEC 60068-2-30
IEC 60068-2-6
IEC 60068-2-27
without any restrictions
reduce output power or ambient temperature,
see Fig. 13-2
> 2000m (6500ft), see Fig. 13-2
The concept of the overvoltage category isused for equipment energized directly fromthe low voltage mains (IEC 60664-1 §4.3.3.2.1).
EN 62477-1, not conductive*) 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***) Tested in combination with DIN rails according to EN 60715 with a height of 15mm and a thickness of 1.3mm and standard mounting
orientation.
Fig. 13-1 Output current vs. ambient temp.

Fig. 13-2 Output current vs. altitude

Allowed Output Current

Allowed Output Current

32.5A

32.5A

short term (< 5s)

24normal mode
20

24
20

15

15

10

10

5
0
-40 -25

20

45

normal mode
A
B

A... Tamb < 45°C
B... Tamb < 70°C

5

Ambient Temperature0

short term (< 5s)

0
70°C

0

2000

Altitude

4000

6000m

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

14. PROTECTION FEATURES
Output over-current protection
Reverse input polarity
protection
Degree of protection
Penetration protection
Over-temperature protection
Input transient protection
Output transient protection
Internal input fuse

not included
includedunit does not start when input voltage is reversed

IP 20> 3.6mmnot included
includedincluded
not included

EN/IEC 60529
e.g. screws, small parts
see EMC chapter
see EMC chapter

15. SAFETY FEATURES
Input / output separation
Safety level of output voltage

Class of protection
PE resistanceno galvanic separation
Mosfet between input and output
The output voltage is regarded to be SELV (EN 60950-1) or PELV (EN 60204-1, EN
62477-1, IEC 60364-4-41) if the input voltage fulfils the requirements for a SELV
source or PELV source.
III
PE (Protective Earth) or chassis connection not required< 0.1Ohm
between housing and chassis-ground terminal

16. DIELECTRIC STRENGTH
The input and output voltages have the same reference, are floating and have no ohmic connection to ground.
Type and factory tests are conducted by the manufacturer. Field tests may be conducted in the field using theappropriate test equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect input/output
and signal terminals together before conducting the test.
When testing, set the cut-off current settings to the value in the table below.

Type test

60s

A
500VacB
500VacFactory test

5s

500Vac

500VacField test

5s

500Vac

500Vac

> 2mA

> 2mA

Fig. 16-1 Dielectric strength

In- / Output

A

+

B

B

-

ChassisCut-off current setting

Load Share OK,
Redundancy OK

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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YR20.246
Y-Series

24-28V, 20A, DUAL REDUNDANCY MODULE

17. APPROVED, FULFILLED OR TESTED STANDARDSUL 508

IEC 60950-1

UL 60950-1

ATEX

IECEx

Class I Div 2

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
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
Agency Certificate (Bureau Veritas)
EN 60079-0 Explosive atmospheres - General requirements
EN 60079-7, EN 60079-15 Equipment protection by type ofprotection "e" and "n"Certificate: EPS 11 ATEX 1 312 X
Temperature Code: T4
Type of Protection: ec nC
IECEx Certificate
IEC 60079-0 Explosive atmospheres - General requirements
IEC 60079-7, IEC 60079-15 Equipment protection by type ofprotection "e" and "n"Certificate: IECEx EPS 12.0032 X
Temperature Code: T4
Type of Protection: ec nC
CSA Certificate
Power Supplies for Hazardous Location
Applicable for Canada and US
CSA Class: 5318-01 (Canada), 5318-81 (USA)
Temperature Code: T4
Groups: A, B, C and D
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 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 10 years
Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364-C1L/W for solvents and water-based paints

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

18. REGULATORY PRODUCT COMPLIANCE
EU Declaration ofConformity

REACH Directive

WEEE Directive

KC Korean Certificate

EAC TR Registration

The CE mark indicates conformance with the- EMC directive- ATEX directive- RoHS directive
Manufacturer's Statement
EU-Directive regarding the Registration, Evaluation,
Authorization and Restriction of Chemicals
Manufacturer's Statement
EU-Regulation on Waste Electrical and Electronic Equipment
Registered in Germany as business to business (B2B) products.
KC Registration
Korean registration of Broadcasting and Communication
Equipment
Registered under Clause 3, Article 58-2 of Radio Waves Act.
EAC Certificate
EAC EurAsian Conformity - Registration Russia, Kazakhstan andBelarus8504408200, 8504409000

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

19. PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth

WeightDIN rail
Housing material
Installation clearances

32mm 1.26’’124mm 4.88’’
117mm 4.61’’
The DIN rail depth must be added to the unit depth to calculate the total required
installation depth.
310g / 0.69lb
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Body: Aluminium alloy
Cover: Zinc-plated steel
See chapter 2

Fig. 19-1 Front viewFig. 19-2 Side view

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

20. ACCESSORIES
20.1. ZM11.SIDE - SIDE MOUNTING BRACKETThis bracket is used to mount the YR20.246 redundancy module 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 canbe mounted.
For sideway DIN rail mounting, the removed aluminum brackets and the black plastic slider need to be mounted on
the steel bracket.
Fig. 20-1
Side mounting without DIN
rail brackets

Fig. 20-2
Side mounting with DIN rail
brackets

Fig. 20-3
Mounting Dimensions
Side mounting bracket

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

21. APPLICATION NOTES
21.1. USING ONLY ONE INPUT INSTEAD OF BOTH CHANNELS
Using only one input instead of both is allowed up to a nominal input current of 12A (at max. +45°C ambient
temperature) or 10A (at max. +70°C ambient temperature).
The load share feature is disabled in cases one input voltage is not present or the level of the input voltage is below acertain value. The MOSFET will be on in such cases.
However, it is always recommended to connect both input path in parallel for reduced power losses and voltage drop.
When this is not possible, the following values can be expected:
Voltage drop, input to output
Power losses
Standby power losses

typ.
typ.
typ.

0.15V
2.6W
1.1W

Fig. 21-1 Input to output voltage drop when only one
input is used

200mV

at 1x10A, 25°C, see Fig. 21-1
at 1x10A, 25°C, see Fig. 21-3

Voltage Drop, typ.
60°C
25°C

Fig. 21-2 Test setup for voltage drop measurements

Power
SupplyI1A

24V, 12A +

150mV

-

V U1

OutputYR20.246
Input 1IOUT
A
OutputVariable
Load,
0-12A

UOUT V

100mV
50mV

Input 2

Input/ Output Current

0mV
0

2.5A

5A

7.5A

10A 12.5A

Fig. 21-3 Power losses when only one input is used

Power Losses, typ

Voltage Drop = U1 - UOUT

Fig. 21-4 Test setup for power loss measurements
Power
Supply

4W

60°C
25°C

3W

I1
A

24V, 12A +

-

V U1

OutputYR20.246
Input 1IOUT
A
OutputVariable
Load,
0-12A

UOUT V

2W
1W

Input 2

Output Current

0
0

2.5A

5A

7.5A

10A 12.5A

Losses = U1 * I1 - UOUT * IOUT

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

21.2. RECOMMENDATIONS FOR REDUNDANCY
Recommendations for the configuration of redundant power systems:-

Use separate input fuses for each power supply.

-

Use three-phase power supplies to gain functional safety if one phase fails.

-

When single-phase power supplies are utilized connect them to different phases or mains circuits if possible.

-

Set the power supply in “Parallel-Use” mode if this feature is available-

It is desirable to set the output voltages of all power supplies to the same value.

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

21.4. SIDEWARD INSTALLATION CLEARANCES
The minimum clearance recommendations are defined in chapter 2.
Normally, the following installation clearance are recommended: 40mm on top, 20mm on the bottom, 5mm on theleft and right sides when the device is loaded permanently with more than 50% of the rated power. Increase thisclearance to 15mm in case the adjacent device is a heat source (e.g. anotherpower supply).
+-

Output

The clearance between the power supplies and the redundancy module can be
reduced to zero under the following conditions:-

1+1 redundancy application with maximum 12A output current.

-

The power supplies are from the PULS DIMENSION series.

-

The redundancy module is placed between the two power supplies.

-

The output voltage is set to the same level on both power supplies.

Power
SupplyInput- + IN 1 IN 2+

YR20.246

Redundancy
ModuleOutput
+

-

-

Power
Supply

Input

Load
0mm

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0+

OutputGermany

0mm

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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

21.5. 1+1 REDUNDANCY UP TO 10A
1+1 Redundancy up to 10A requires two 10A power supplies and one YR20.246 redundancy module.
Fig. 21-5 Wiring diagram, 1+1 Redundancy, 10A output current

+ + -

+ + -

-

-

Output
24V,10A

Output
24V,10A- - + +

1
Input

2
Input

Load Share
OK
Redudnadcy
OK

Power
SupplyPower
Supply
Input

Input

L N PEL N PEoooo

YR20.246

Redundancy
ModuleLoad
Share
Warning

FailureMonitor

Output

- +

I

I

L
N

optional

10A
Load

PE

Note: Use separate mains systems for each power supply whenever it is possible

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
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YR20.246
24-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

21.6. 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. 21-6
Mounting
Orientation A(Standardorientation)

Output Current

24A

INPUT

A1

18
Redundancy
Module12
6

Ambient Temperature

0

OUTPUT

20
Fig. 21-7
Mounting
Orientation B(Upside down)

30

40

50

60

70°C

Output Current

24A

A1

OUTPUT

18
Redundancy
Module12
6

Ambient Temperature

0

INPUT

20
Fig. 21-8
Mounting
Orientation C(Table-top
mounting)

30

40

50

70°C

60

Output Current

24A
18

A2

12

A1

6
Ambient Temperature

0
20

50

60

70°C

24A
INPUT

Redundancy
Module

18

A2
A1

12
6
Ambient Temperature

0
20

30

40

50

60

70°C

Output Current

OUTPUT

Redundancy
Module24A
INPUT

Fig. 21-10
Mounting
Orientation E(Horizontal ccw)

40

Output Current

OUTPUT

Fig. 21-9
Mounting
Orientation D(Horizontal cw)

30

18

A2
A1

12
6
Ambient Temperature

0
20

30

40

50

60

70°C

Jul. 2021 / Rev. 1.7 DS-YR20.246-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient andafter a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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