YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

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

For N+1 and 1+1 Redundant Systems
Dual Input with Single Output
Only 60mV Voltage Drop at 10A Output Current
Only 0.6W Loss at 10A
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 YR20.242 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 12-28V
Input voltage range 8.4-36.4Vdc
Input current
2x 0-24A
2x 0-20A
Output current
0-24A
0-20A
max. 26A

In addition to the YR20.242, the YR20.246 is available
which is featured with an automated load sharing
between the connected power supplies and functions
which monitor defects in the redundancy circuit or too
high output currents, which could prevent redundancy,
if one power supply fails.
The YR20.242 utilizes MOSFETs instead of diodes for thedecoupling of the two input channels. This reduces theheat generation and the voltage drop between input
and output. 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
Redundancy
ModuleYR20.242

Accessory

ZM11.SIDE

Input to output
voltage drop
Power losses

Temperature range
Dimensions
Weight±30%

ambient <+45°C**)
ambient <+70°C**)
ambient <+45°C
ambient <+70°C
in overload*) or
short circuit mode
60mV
input: 2x5A
110mV
input: 2x10A
210mW
at no load
0.6W
input: 2x5A
2.0W
input: 2x10A-40°C to +70°C operational
32x124x117mm WxHxD
250g, 0.56lb*) Currents at voltages below 6V**) Sum of input current of both input max. 20A rsp. 24A

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

Side mount bracket
UL 508

UL 60950-1

ATEX

IECEx

Class I Div 2

Jul. 2021 / Rev. 1.6 DS-YR20.242-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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12-28V, 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. EMC ......................................................................9
10. Environment ......................................................10
11. Protection Features ...........................................11
12. Safety Features ..................................................11
13. Dielectric Strength ............................................11
14. Approved, Fulfilled or Tested Standards..........12Page
15. Regulatory Product Compliance ...................... 13
16. Physical Dimensions and Weight ..................... 14
17. Accessories ........................................................ 15
17.1. ZM11.SIDE - Side Mounting Bracket ........ 15
18. Application Notes ............................................. 16
18.1. Using Only One Input instead of BothChannels ............................................................... 16
18.2. Recommendations for Redundancy......... 1718.3. Inductive and Capacitive Loads................ 1718.4. Sideward Installation Clearances ............. 1718.5. 1+1 Redundancy up to 10A ...................... 18
18.6. N+1 Redundancy, Example with 30A ...... 18
18.7. Mounting Orientations ............................ 19

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 eachother by utilizing diodes or other switching arrangements. E.g. two 10A power supplies areneeded to achieve a 10A redundant
N+1
1+1
system.

N+1 Redundancy

Use of three or more identical power
supplies in parallel to provide
continued operation following most
failures in a single power supply. All
power supply outputs should be
isolated from each other by utilizing
diodes or other switchingarrangements.
E.g.: To achieve a 40A redundant
system, five 10A power supplies areneeded in a N+1 redundant system.

Redundancy

AC

AC
DC

AC
DC

AC
DC

Redundancy

AC

AC
DC

DC

AC
DC

AC
DC

DC

IN 1 IN 2

IN 1 IN 2

OUT

OUT

OUT

OUT

-

Load

Jul. 2021 / Rev. 1.6 DS-YR20.242-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+

IN 1 IN 2+

IN 1 IN 2

-

Load

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12-28V, 20A, DUAL REDUNDANCY MODULE

Y-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.
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. 1.6 DS-YR20.242-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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12-28V, 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.
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 IIC T4 Gc

WARNINGEXPLOSION HAZARDS!

Substitution of components may impair suitability for this environment.
Do does 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. 1.6 DS-YR20.242-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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YR20.242
12-28V, 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)
2)
3)

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

2
1
DC 12-28V
8.4-36.4Vdc
60mV
110mV
130mV
2x 0-24A 1)
2x 0-20A 1)
2x 32.5A 2)
2x 700A
24A
20A
32.5A 3)
26A

max.
max.
typ.

1mA
40Vdc
320µF

nom.

±30%
at 2x5A, 25°C, see Fig. 3-1
at 2x10A, 25°C, see Fig. 3-1
at 2x12A, 25°C, 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

Ensure that the sum of both input currents stays below 24A rsp. 20A.
Ensure that the sum of both input currents stays below 32.5A.
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

150mV

Voltage Drop, typ

125mVFig. 3-2 Test setup for voltage drop measurements

60°C
25°C

Power
Supply24V, 12A +

100mV

-

I1
A
V U1

OutputYR20.242
Input 1IOUT
A
OutputVariable
Load,
0-24A

UOUT V

75mV
Power
Supply50mV

24V, 12A +

25mV
0mV
Output: 0
Input: 0

Input / Output Current

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

I1 = I2

I2
AV U2

Input 2U1 = U2

Voltage Drop = U1 - UOUT

Jul. 2021 / Rev. 1.6 DS-YR20.242-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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12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

4. POWER LOSSESPower losses

typ.
typ.
typ.

Standby power losses

DC 12V
0.6W
2.0W
0.11W

DC 24V
0.6W
2.0W
0.21W

Fig. 4-1 Power losses

input: 2x5A, ambient temperature: 25°C
input: 2x10A, ambient temperature: 25°C
at no output current
Fig. 4-2 Test setup for power loss measurements

Power Losses, typ.

3.5W

60°C

3.0

25°C

Power
SupplyI1A

24V, 12A +

2.5

-

V U1

OutputYR20.242
Input 1IOUT
A
OutputVariable
Load,
0-24A

UOUT V

2.0
1.5

Power
Supply1.0

I2
A

24V, 12A +0.5-

Output Current

0
0

2.5

5

7.5 10 12.5 15 17.5 20 22.5 25A

I1 = I2

V U2

Input 2Losses = ( U1 * I1 + U2 * I2 ) - UOUT * IOUT

U1 = U2

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
553 000h *)1 563 000h *)10 050 000h
16 777 000h
2 030 000h
2 801 000h
441 000h
604 000h

Input: 2x10A
Output: 20A
355 000h *)1 003 000h *)7 895 000h
13 403 000h
1 890 000h
2 588 000h
404 000h
548 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. 1.6 DS-YR20.242-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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12-28V, 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
AWG 20-102.8mm (including ferrule)
7mm / 0.275inch
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 torqueInstructions: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
control

+

+

-

-

Input 1ChassisGround+Input 2-

Outputcontrol

Jul. 2021 / Rev. 1.6 DS-YR20.242-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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YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

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

Output Terminals (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)

Jul. 2021 / Rev. 1.6 DS-YR20.242-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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YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

9. 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

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
20V/m
Input lines
2kV
EN 61000-4-4
Output lines
2kV
500V
EN 61000-4-5+1kV+/-  Chassis ground

Surge voltage on output
lines

EN 61000-4-5

Conducted disturbancePower-frequency magnetic
field 1)

EN 61000-4-6
EN 61000-4-8++/-  Chassis ground0.15-80MHz
50Hz

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

500V
1kV

Criterion A
Criterion A

20V
30A/m

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.

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 2) 3)
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 2) 3)
output lines
Radiated emission
EN 55011, EN 55032
Class B 3)
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:
2) For information only, not mandatory for EN 61000-6-3.
3) 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. 1.6 DS-YR20.242-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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12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

10. 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 de-rating
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. 10-2
> 2000m (6500ft), see Fig. 10-2
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. 10-1 Output current vs. ambient temp.

Fig. 10-2 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. 1.6 DS-YR20.242-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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10/19

YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

11. 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 section
see EMC section

12. 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

13. 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
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
500VacFactory test

5s

500VacField test

5s

500VacFig. 13-1 Dielectric strength

In- / Output+-

A

ChassisCut-off current setting> 2mA

Jul. 2021 / Rev. 1.6 DS-YR20.242-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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YR20.242
Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

14. 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 G3

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 Equipment protection by type of protection "e"Certificate: EPS 11 ATEX 1 312 X
Temperature Code: T4
Type of Protection: ec
IECEx Certificate
IEC 60079-0 Explosive atmospheres - General requirements
IEC 60079-7 Equipment protection by type of protection "e"Certificate: IECEx EPS 12.0032 X
Temperature Code: T4
Type of Protection: ec
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-C1-L/W
for solvents and water-based paints

Jul. 2021 / Rev. 1.6 DS-YR20.242-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

12/19

YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

15. REGULATORY PRODUCT COMPLIANCE
EU Declaration ofConformity

REACH Directive

WEEE Directive

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.
EAC Certificate
EAC EurAsian Conformity - Registration Russia, Kazakhstan
and Belarus
8504408200, 8504409000

Jul. 2021 / Rev. 1.6 DS-YR20.242-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

13/19

YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

16. 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.
250g / 0.56lb
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. 16-1 Front viewFig. 16-2 Side view

Jul. 2021 / Rev. 1.6 DS-YR20.242-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

14/19

YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

17. ACCESSORIES
17.1. ZM11.SIDE - SIDE MOUNTING BRACKETThis bracket is used to mount the YR20.242 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. 17-1
Side mounting without DIN
rail brackets

Fig. 17-2
Side mounting with DIN rail
brackets

Fig. 17-3
Mounting Dimensions
Side mounting bracket

Jul. 2021 / Rev. 1.6 DS-YR20.242-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

15/19

YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series

18. APPLICATION NOTES
18.1. USING ONLY ONE INPUT INSTEAD OF BOTH CHANNELS
Using only one input instead of both is allowed up to a nominal input current of 24A (at max. +45°C ambient
temperature) or 20A (at max. +70°C ambient temperature).
However, it is always recommended to connect both input path in parallel for reduced power losses and voltage drop.
In cases when this is not possible, the following values can be expected:
Voltage drop, input to output
Power losses
Standby power losses

typ.
typ.
typ.
typ.
typ.
typ.

80mV
150mV
0.75W
3.0W
0.07W
0.14W

Fig. 18-1 Input to output voltage drop when only one
input is used

200mV

Voltage Drop, typ.

60°C
25°C

at 1x10A, 25°C, see Fig. 18-1
at 1x20A, 25°C, see Fig. 18-1
at 1x10A, 25°C, see Fig. 18-3
at 1x20A, 25°C, see Fig. 18-3
at 12V operation
at 24V operation
Fig. 18-2 Test setup for voltage drop measurements

Power
SupplyI1A

24V, 24A +

150mV

-

V U1

OutputYR20.242
Input 1IOUT
A
OutputVariable
Load,
0-24A

UOUT V

100mV
50mV
Input 2

Output Current

0mV
0

5A

10A

15A

20A

25A

Fig. 18-3 Power losses when only one input is used
Power Losses, typ.

6W
5.0
4.0

Voltage Drop = U1 - UOUT

Fig. 18-4 Test setup for power loss measurements
Power
Supply60°C

24V, 24A +

25°C

-

I1
A
V U1

OutputYR20.242
Input 1IOUT
A
OutputVariable
Load,
0-24A

UOUT V

3.0
2.0
1.0

Input 2

Output Current

0
0

2.5

5

7.5 10 12.5 15 17.5 20 22.5 25A

Losses = U1 * I1 - UOUT * IOUT

Jul. 2021 / Rev. 1.6 DS-YR20.242-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

16/19

YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series18.2. 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 additional 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.

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

18.4. 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. another power
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+

YR20.242

Redundancy
ModuleOutput
+

-

-

Power
Supply

Input

Load
0mm

Jul. 2021 / Rev. 1.6 DS-YR20.242-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

17/19

YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series18.5. 1+1 REDUNDANCY UP TO 10A
1+1 Redundancy up to 10A requires two 10A power supplies and one YR20.242 redundancy module.
Fig. 18-5 Wiring diagram, 1+1 Redundancy, 10A output current

FailureMonitor++ - -+ - + -++ - -

YR20.242
Redundancy
ModulePower
SupplyInput Input
2
1

DC24V,10A OK

Power
SupplyOutputL1 L2 L3 PE

I

L1 L2 L3 PE

- +

10A
Load

optionalI

DC24V,10A OK

I

I

I

I

L1
L2
L3
PE

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

18.6. N+1 REDUNDANCY, EXAMPLE WITH 30A
N+1 Redundancy up to 30A requires four 10A power supplies and two YR20.242 redundancy modules.
Fig. 18-6 Wiring diagram, n+1 Redundancy, 30A output current

FailureMonitor

DC24V,10A OK

Power
Supply+ - + -++ - -++ - -

YR20.242
Redundancy
ModulePower
SupplyPower
SupplyL1 L2 L3 PE

L1 L2 L3 PE

Input Input
2
1

OutputL1 L2 L3 PE

I

I

optionalI- +DC24V,10A OK

I

I

I

DC24V,10A OK

I

I

I

L1
L2
L3
PE

+ - + -++ - -

YR20.242
Redundancy
ModulePower
SupplyInput Input
2
1

Output- +optional++ - -

DC24V,10A OK

L1 L2 L3 PE

30A
Load
I

I

I

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

Jul. 2021 / Rev. 1.6 DS-YR20.242-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

18/19

YR20.242
12-28V, 20A, DUAL REDUNDANCY MODULE

Y-Series18.7. 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. 18-7
Mounting
Orientation A(Standardorientation)

Output Current

24A

INPUT

A1

18
Redundancy
Module12
6

Ambient Temperature

0

OUTPUT

20
Fig. 18-8
Mounting
Orientation B(Upside down)

30

40

60

50

70°C

Output Current

24A

A1

OUTPUT

18
Redundancy
Module12
6

Ambient Temperature

0

INPUT

20
Fig. 18-9
Mounting
Orientation C(Table-top
mounting)

30

40

50

60

70°C

Output Current

24A
18

A2

12

A1

6
Ambient Temperature

0
20

50

70°C

60

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. 18-11
Mounting
Orientation E(Horizontal ccw)

40

Output Current

OUTPUT

Fig. 18-10
Mounting
Orientation D(Horizontal cw)

30

18

A2
A1

12
6
Ambient Temperature

0
20

30

40

50

60

70°C

Jul. 2021 / Rev. 1.6 DS-YR20.242-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

19/19