YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

REDUNDANCY MODULE











Cost Effective Solution to Build Redundant Systems
Dual Input with Single Output
Alarm Relay-contacts for Each Input Path
Two Diodes (Common Cathode)DC 24-48V ±25% (18-60Vdc) Wide-range Input
Full Power Between -40°C and +60°C
Width only 32mm
Rugged Metal Housing
Large Screw Terminals
Easy Wiring:
Distribution Terminal for Negative Pole Included
 3 Year Warranty

PRODUCT DESCRIPTIONSHORT-FORM DATAThe YRM2.DIODE is a redundancy module, which can be used tobuild 1+1 and N+1 redundant systems. It is equipped with two input
channels, which can be connected to power supplies with up to 10A
output current and one output, which can carry nominal currents up
to 20A. The module is suitable for power supplies with constantcurrent overload behavior as well as any kind of “Hiccup” overload
behavior.

Input voltage
Input voltage range
Input current

Output current

The YRM2.DIODE has a monitoring circuit included and is the perfectsolution when the power supply has no DC-OK function. Two LEDs
and two relay contacts signal when one of the two DC-input
voltages is not in range due to a non-functioning or disconnected
power supply.

Maximum overload
current

In addition to the YRM2.DIODE is the YR2.DIODE which has nomonitoring circuitry included. This is the perfect fit when the power
supply itself is already equipped with a DC-OK signal (e.g.:
DIMENSION Q-Series).

Power losses

Large screw terminals allow an easy installation and a hugeinternational approval package for a variety of applications makes
this unit suitable for nearly every situation.

ORDER NUMBERS

Input to output voltage
loss

Temperature range
Derating
Dimensions
WeightDC 24-48V
18-60Vdc
2x 10A
2x 7.5A
2x 16A
20A
15A
32A
25A R.M.S.

±25%

Below +60°C ambient
At +70°C ambient
Up to 5 seconds
Continuous, <+60°C
Continuous, at +70°C
Short term, up to 5s
In any overload or
short circuit condition
Derate linearly between +60 and +70°C
780mV
At 2x 5A input
850mV
At 2x 10A input
0W
At no load
8.8W
At 2x 5A input
18W
At 2x 10A input-40°C to +70°C
operational,
0.5A/°C+60 to +70°C
32x124x117mm
WxHxD
350g

MAIN APPROVALS
For details and the complete approval list, see chapter 15.

Redundancy
ModuleYRM2.DIODE

DC 12-48V

Accessory

ZM1.WALL

Wall/ panel mount bracket

ZM11.SIDE

Side mount bracket

UL 508

UL 60950-1

ATEX

IECEx

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

Class I Div 2

Marine

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YRM2.DIODE
DC24-48V, 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. Alarm Contacts.......................................................... 6
6. Lifetime Expectancy and MTBF .................................. 7
7. Terminals and Wiring................................................. 8
8. Functional Diagram ................................................... 9
9. Front Side and User Elements .................................... 9
10. EMC........................................................................ 10
11. Environment ........................................................... 11
12. Protection Features................................................. 12
13. Safety Features ....................................................... 12
14. Dielectric Strength................................................... 12
15. Approved, Fulfilled or Tested Standards................... 13
16. Regulatory Product Compliance............................... 14

Page
17. Physical Dimensions and Weight.............................. 15
18. Accessories ............................................................. 16
18.1. ZM1.WALL - Wall mounting bracket ............... 16
18.2. ZM11.SIDE - Side mounting bracket................ 16
19. Application Notes.................................................... 1719.1. Recommendations for Redundancy................ 1719.2. Inductive and Capacitive Loads....................... 1719.3. Example: 1+1 Redundancy up to 10A.............. 1719.4. Example: N+1 Redundancy up to 30A ............. 18
19.5. Example: Battery Back-up .............................. 18
19.6. Example: Redundancy for Controls................. 1919.7. Example: Decoupling of Branches................... 20
19.8. Use in a Tightly Sealed Enclosure.................... 20
19.9. Mounting Orientations................................... 21

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.

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.

DC 24VA figure displayed with the AC or DC before the value represents a nominal voltage with standard 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 indicating flexibility of choice with no implied preferenceshall

A key word indicating a mandatory requirement

shouldA key word indicating 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 asingle power supply. The two power supply
N+1
1+1
Redundancy
Redundancy
outputs should be isolated from each other by
AC
AC
AC
AC
AC
AC
AC
AC
utilizing diodes or other switching arrangements.
DC
DC
DC
DC
DC
DC
DC
DC
E.g. two 10A power supplies are needed toachieve a 10A redundant system.

N+1 Redundancy

IN 1 IN 2
IN 1 IN 2
Use of three or more identical power supplies inparallel to provide continued operation following
OUT
OUT
most failures in a single power supply. All power
supply outputs should be isolated from eachother by utilizing diodes or other switchingLoadarrangements. E.g.: To achieve a 40A redundant
system, five 10A power supplies are needed in a N+1 redundant system.

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

IN 1 IN 2

IN 1 IN 2

OUT

OUT

+

+

Earth, Ground

-

Load

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DC24-48V, 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. Ground the 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 inmarine applications according to the DNV regulations.
Install the device onto a DIN rail according to EN 60715 with the input terminals on the top 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 are designed for aminimum 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 SELV or 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 be beneficial to gain a highEMI immunity.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do not cover ventilation
grid!
The device is designed for altitudes up to 6000m. See additional requirements in the product datasheet for use above 2000m.
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and right side. Increase the 5mm to15mm in case the adjacent device is a heat source. When the device is permanently loaded with less than 50%, the 5mm can be reduced
to zero.
May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

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YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

The maximum surrounding air temperature is +70°C. The operational temperature is the same as the ambient or 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 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 the requirements of the
EN 60079-0.

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

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YRM2.DIODE
DC24-48V, 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

Peak input current
Output current

Reverse current
Reverse voltage
Note 1:
Note 2:nom.

2
1
DC 24-48V

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

18-60Vdc
0.78V
0.85V
0.85V
2x 0-10A
1x 0-20A
2x 10-16A
150A

at 2x5A, see Fig. 3-1
at 1x10A, see Fig. 3-2
at 2x10A, see Fig. 3-1
continuous
continuous, see note 1
for up to 5 seconds
for maximal 10ms per input

nom.
nom.
max.
max.
max.

20A
20-32A
25A
2mA
60Vdc

continuous
for up to 5 seconds
at continuous overload or short circuit, see note 2
per input, -40°C to +60°C
voltage applied to the output, continuously allowed±25%
The input circuitry must meet the SELV requirements stipulated
by IEC/EN/UL 60950-1.

Each input can be loaded up to 20A. At currents above 10A, the other input should not be loaded. It is preferable to parallel the two inputs in order tominimize the power loss in such cases.
Ensure that the continuous output current does not exceed 25A. Check the short-circuit current of the power sources and if the power source candeliver more than 25A together, use an appropriate fuse on the output.
Fig. 3-1 Input to output voltage drop when both inputs draw current(typical 1+1 redundant case, when the output voltages of the two units are equal or set into “parallel use” mode)

Voltage Drop, typ.

QS/QT101000mV

24V,10A

I1
A

+

800mV

A

V U1

B
A... 25°C
B... 60°C

Input: 05A
2x2.5A

10A
2x5A

UOUT V

I2
A+

Input, Output Current

Output: 0

OutputVariable
Load,
0-20A

QS/QT10
24V,10A

200mV
0mV

Input 1

IOUT
A

-

600mV
400mV

OutputYR2 / YRM2

15A
20A
2x7.5A 2x10A

V U2

Input 2I1 = I2

U1 = U2

Voltage Drop = U1 - UOUT

Fig. 3-2 Input to output voltage drop when only one input draws current
QS/QT20

Voltage Drop, typ.

I1
A

24V,20A

1000mV

+

800mV

A

V U1

OutputYR2 / YRM2

Input 1IOUT
A
OutputVariable
Load,
0-20A

UOUT V-

B

600mV
A... 25°C
B... 60°C

400mV
200mV

Output Current

0mV
0

5A

10A

15A

Not used or
power supply
with lower
voltage

Input 220A

Voltage Drop = U1 - UOUT

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

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YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

4. POWER LOSSESPower losses

DC 24V
8.8W
9.5W
18.0W
1.0W

typ.
typ.
typ.
typ.

Standby power losses

input: 2x5A
input: 1x10A
input: 2x10A
at no output current

Fig. 4-1 Power losses

Power Losses, typ.

24W
20
16
12
8
4
Output Current

0
0

5

10

15

20

25A

5. ALARM CONTACTS
Both input voltages are monitored individually. If one input voltage is too low or completely lost, it will be indicated by an alarm relay
contact.
Each input has its own monitoring circuitry and relay contact.
21.5V (±0.5V)

Alarm thresholdnom.

Contact ratings

60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A
min.
1mA at 5Vdc
max.
see dielectric strength table in section 14.

Isolation voltage

Relay contact opens immediately after the
input voltage falls below this value.
input: 1x10A
input: 2x10A

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

6/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

6. 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 beconsidered 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.
The redundancy module does not have electrolytic capacitors included. Therefore, the lifetime expectancy is extremely high.
Input / output
current conditions
Lifetime expectancy *)MTBF **) SN 29500, IEC 61709
MTBF **) MIL HDBK 217F

min.
min.

Input: 2x10A
Output: 20A
25 years
25 years
9 100 000h
15 700 000h
9 200 000h
12 600 000h
3 380 000h
4 630 000h

Input: 2x5A
Output: 10A
25 years
25 years
10 900 000h
18 800 000h
11 100 000h
15 100 000h
4 060 000h
5 570 000h

at 24V and 40°C
at 24V and 25°C
at 24V 40°C
at 24V 25°C
at 24Vand 40°C (Ground Benign GB40)
at 24Vand 25°C (Ground Benign GB25)
at 24Vand 40°C (Ground Fixed GF40)
at 24Vand 25°C (Ground Fixed GF25)*)
The Lifetime expectancy shown in the table indicates the minimum operating hours (service life).
**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a device. It is the statisticalrepresentation 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 that statistically one unit will failevery 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.

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

7/22

YRM2.DIODE
Y-Series

DC24-48V, 20A, DUAL REDUNDANCY MODULE

7. TERMINALS AND WIRINGType

Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter
Wire stripping length
Screwdriver
Recommended tightening torque

Input and output terminals
Screw terminals
IP20 Finger safe construction.
Suitable for field installation.
0.5-6mm2
0.5-4mm220-10 AWG
2.8mm (including ferrule)7mm
3.5mm slotted or Pozidrive No 2
0.8Nm

Alarm-signal terminals
Screw terminals, pluggable
IP20 Finger safe construction.
Suitable for field installation.
0.2-1.5mm2
0.2-1.5mm2
22-14 AWG
6mm
3mm slotted
0.4Nm

Instructions:a) The external circuitry of all terminals (including signalling contacts) must meet the safety requirements stipulated by IEC/EN/UL
60950-1: SELV.
b) 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.
c) Follow national installation codes and installation regulations!
d) Ensure that all strands of a stranded wire enter the terminal connection!
e) Screws of unused terminal compartments should be securely tightened.
f) Ferrules are allowed.
g) Do not connect or disconnect the wires from the terminals below -25°C.

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

8/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

8. FUNCTIONAL DIAGRAM
Fig. 8-1 Functional diagram
Input
Voltage
MonitorInput 1ok

Input 1

Alarm
Relay

+
-

+ Output
ChassisGround+Input 2
Input
Voltage
MonitorInput 2ok

Input 1Alarm
contact

Alarm
Relay

Input 2Alarm
contact

9. FRONT SIDE AND USER ELEMENTS
Fig. 9-1 Front sideA

Output terminals

B

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

C

Input terminals for input 1

D

Input terminals for input 2

E

Alarm-signal terminals for input 1 monitoring (relay contact)

F

Alarm-signal terminals for input 2 monitoring (relay contact)

G

Green LED for input 1 (LED is on, when input voltage is in range)

H

Green LED for input 2 (LED is on, when input voltage is in range)

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

9/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

10.EMCThe redundancy module is suitable for applications in industrial environment as well as in residential, commercial and light industry
environment without any restrictions. A detailed EMC report is available on request.

EMC Immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)

Surge voltage on input lines
Surge voltage on output lines
Surge voltage on
alarm contacts
Conducted disturbancePower-frequency magnetic field *)According generic standards: EN 61000-6-1 and EN 61000-6-2
EN 61000-4-2
Contact discharge
Air discharge
EN 61000-4-3
80MHz-2.7GHz
EN 61000-4-4
Input lines
Output lines
Alarm contacts
EN 61000-4-5+/-  Chassis groundEN 61000-4-5+/-  Chassis groundEN 61000-4-5
Alarm contact  Chassis ground

8kV
15kV
10V/m
2kV
2kV
2kV
1kV
1kV
1kV

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

EN 61000-4-6
EN 61000-4-8

10V
30A/m

Criterion A
Criterion A

0.15-80MHz
50Hz

Criterions:
A: Redundancy module shows normal operation behavior within the defined limits.
Notes:*) 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.

EMC Emission
Conducted emission

According generic standards: EN 61000-6-3 and EN 61000-6-4
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
Class B, input lines *)IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
Class B, output lines *)Radiated emission
EN 55011, EN 55032
Class B
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) this device must accept
any interference received, including interference that may cause undesired operation.
*)

Provided, that power sources connected on the inputs fulfill the class B requirements too.

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

10/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

11.ENVIRONMENT
Operational temperature *)Output derating
Storage temperature
Humidity **)Vibration sinusoidal ***)

-40°C to +70°C
0.5A/°C-40 to +85°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
2000 to 6000m

Shock ***)

Altitude

Altitude derating
Over-voltage category

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

Degree of pollution

2

Reduce output power above +60°C+60 to +70°C , see Fig. 11-1
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. 11-2
> 2000m, see Fig. 11-2
The concept of the overvoltage category is used forequipment energized directly from the low voltage
mains (IEC 60664-1 §4.3.3.2.1).
IEC 62103, EN 50178, 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. 11-1 Output current vs. ambient temp.

Allowed Output Current

Allowed Output Current

30A

30A
25

Fig. 11-2 Output current vs. altitude

at overload / short circuit

20

normal mode

15

10

10

5

5
Ambient Temperature

020

normal mode

20

15

0
-40 -25

overload / short circuit

25

40

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

0

2000

4000

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

C

Altitude0

60 70°C

B

6000m

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DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

12.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
included
IP 20> 3.6mmnot included
not included
included
not included

unit does not start when input voltage is reversed
EN/IEC 60529
e.g. screws, small parts

see EMC chapter

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

no galvanic separation
200V epitaxial diode between input and output
The output voltage is regarded to be SELV (EN 60950-1) or PELV (EN 60204-1, EN 50178, IEC
60364-4-41) if the input voltage and the voltage which is applied to the alarm contacts fulfil therequirements for a SELV source or PELV source.
III
PE (Protective Earth) or chassis connection not required< 0.1Ohm
between housing and chassis-ground terminal

Class of protection
PE resistance

14.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 the appropriate test
equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect input/output/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

500VacFig. 14-1 Dielectric strength

In- / Output

Chassis
A

+

B

B

-

Cut-off current setting

> 2mA

DC-ok

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

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YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

15.APPROVED, FULFILLED OR TESTED STANDARDSUL 508

IEC 60950-1

UL 60950-1

ATEX

IECEx

Class I Div 2

Marine (DNV)

Marine (ABS)IEC 60068-2-60

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 of protection "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 of protection "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
DNV Certificate
DNV Type approved product
Certificate: TAA00001ST
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-PD
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.

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

13/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

ISA-71.04 G3

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

VDMA 24364

16.REGULATORY PRODUCT COMPLIANCE
EU Declaration of Conformity

REACH Directive

WEEE Directive

UKCA

CCC

KC Korean Certificate

EAC TR Registration

The CE mark indicates conformance with the- EMC directive- ATEX directive- RoHS directive
Manufacturer's Statement
EU regulation regarding the Registration, Evaluation, Authorisation andRestriction of Chemicals (REACH) fulfilled.
EU Regulation (EC) 1907/2006
Manufacturer's Statement
EU-Directive on Waste Electrical and Electronic Equipment (WEEE)
Registered in Germany as business to business (B2B) products.
WEEE-Reg.-Nr. DE 55837529
UKCA Declaration of Conformity
Trade conformity assessment for England, Scotland and WalesThe UKCA mark indicates conformity with the UK Statutory Instruments
2016 No.1091,
2016 No.1107,
2012 No.3032
CCC Certificate
China Compulsory Certification (CNCA-C23-01:2019)
Certificate for devices made in Suzhou/China (PULS Electronics):
2022122303114925
Certificate for devices made in Chomutov/Czech Republic (PULS
investiční): 2021122303114444
CCC-ExKC Registration
Korean - Registration of Broadcasting and Communication Equipment
KOSHA - Korea Occupational Safety and Health Agency
Registration No. R-R-PUG-YRM2_DIODEEAC Certificate
EAC EurAsian Conformity - Registration Russia, Kazakhstan and Belarus
8504408200, 8504409000

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

14/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

17.PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth
WeightDIN rail

Installation clearances

32mm
124mm
117mm
350g
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN rail depth must be added to the unit depth (117mm) to calculate the total required installation
depth.
See chapter 2

Fig. 17-1 Front viewFig. 17-2 Side view

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

15/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

18.ACCESSORIES
18.1. ZM1.WALL - WALL MOUNTING BRACKETThis standard bracket is used to mount the YR40 redundancy module onto a flat surface without utilizing a DIN rail.
Fig. 18-1 ZM1.WALL Wall mounting bracket

Fig. 18-2 Assembled wall mounting bracket

18.2. ZM11.SIDE - SIDE MOUNTING BRACKETThis bracket is used to mount the YR80 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 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.
Fig. 18-3
ZM11.SIDE Side mounting bracket

Fig. 18-4
Side mounting with DIN rail brackets

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

16/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

19.APPLICATION NOTES
19.1. 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.

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

19.3. EXAMPLE: 1+1 REDUNDANCY UP TO 10A
1+1 Redundancy up to 10A requires two 10A power supplies and one YRM2.DIODE redundancy module.
Fig. 19-1 Wiring diagram, 1+1 Redundancy, 10A output current

FailureMonitor+ + - 24V, 10A+ -+ IN 1 IN 2 IN 1IN 2+ + - 24V, 10A

10A
Power Supply

YRM2.DIODE

10A
Power Supply

L N PEOUT+ -L N PE

optional
I

I

10A
Load
L
N
PE

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

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

17/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

19.4. EXAMPLE: N+1 REDUNDANCY UP TO 30A
N+1 Redundancy up to 30A requires four 10A power supplies and two YRM2.DIODE redundancy modules.
Fig. 19-2 Wiring diagram, n+1 Redundancy, 30A output current

FailureMonitor+ + - 24V, 10A+ -+ IN 1 IN 2 IN 1IN 2+ + - 24V, 10A+ + - 24V, 10A+ -+ IN 1 IN 2 IN 1IN 2+ + - 24V, 10A

10A
Power Supply

YRM2.DIODE

10A
Power Supply

10A
Power Supply

YRM2.DIODE

10A
Power Supply

L N PEL N PEL N PE

OUT
+ -

OUT
+ -

optional

L N PE

optional

I

I

I

I

L
N
PE
30A
Load

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

19.5. EXAMPLE: BATTERY BACK-UP
A battery back-up with 10A requires one 10A power supply and one YRM2.DIODE redundancy module.
Please note:
Set output voltage of power supply to 26.5Vdc minimum to ensure, that the load current is delivered from the power supply and notfrom charger (battery). Use a fuse between battery and YRM2.DIODE!
Fig. 19-3 Wiring diagram, 10A Battery back-up

FailureMonitorI

24V Battery++ + - 24V, 10A+ - + IN 1 IN 2 IN 1IN 2

10A
Power Supply

YRM2.DIODE

Battery
ChargerOUT+ -L N PE

L
N
PE

optional

10A
Load

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

18/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

19.6. EXAMPLE: REDUNDANCY FOR CONTROLSThe example shows a cost effective solution to get redundant power for a PLC or controller system.
In many cases, two power supplies are used; one for the demanding loads and another one for the controls and sensitive loads. The
power supply for the demanding loads can be used as a redundant source to supply the controls.
Traditional approach:

Improved approach:

PS1

Load

PS2

PLC

PS1

Load
YR2

PS2

PLC

Fig. 19-4 Wiring diagram, redundancy for sensitive loads
FailureMonitor

Heavy
Loads
e.g. Motors+ + - 24V, 20A+ - + IN 1 IN 2 IN 1IN 2+ + - 24V, 5A

20A
Power Supply

YRM2.DIODE

5A
Power
SupplyL1 L2 L3 PE

OUT
+ -

L N PE

I

L1
L2
L3
N
PE

I

I
optional

Sensitive
Loade.g.
Controller

I

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

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

19/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

19.7. EXAMPLE: DECOUPLING OF BRANCHES
Buffer energy supplied from a DC-UPS or buffer module is not wasted in “power branches”.
Please note:
Set output voltage of the power supply to a level that the buffer unit or DC-UPS will not start unexpected. Take the voltage drop of theYRM2.DIODE into account.
Fig. 19-5 Wiring diagram, decoupling of buffered branches
FailureMonitorLoade.g. Motor+ + - 24V, 10A+ - + IN 1 IN 2 IN 1IN 2

10A
Power Supply

YRM2.DIODE

L N PE

I

I

BufferModuleOUT+ Buffered
Load
e.g.
Controller

I

L1
L2
L3
PE

optional

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

19.8. USE IN A TIGHTLY SEALED ENCLOSURE
When the redundancy module is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher than outside.
The inside temperature defines the ambient temperature for the redundancy module.
Results from such an installation:
Power supply is placed in the middle of the box, no other heat producer inside the box
Enclosure:
Load:
Input:
Temperature inside enclosure:
Temperature outside enclosure:
Temperature rise:
34.2K

Rittal Typ IP66 Box PK 9516 100, plastic, 110x180x165mm
24V, 16A; (=80%) load is placed outside the box
24Vdc
58.8°C (in the middle of the right side of the power supply with a distance of 2cm)
24.6°CMay 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

20/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

19.9. MOUNTING ORIENTATIONSMounting orientations other than input terminals on the bottom and output on the top require a reduction in continuous output power
or a limitation in the maximum allowed ambient temperature.
Fig. 19-6
Mounting
Orientation A(Standardorientation)

Output Current
INPUT

20A
16
12
8
4
0
10

Redundancy
ModuleOUTPUT

Fig. 19-7
Mounting
Orientation B(Upside down)

30

40

50

60°C

OUTPUT

20A
16
12
8
4
0
10

Ambient Temperature

20

30

40

50

60°C

Redundancy
M odule
INPUT

Output Current

20A
16
12
8
4
0
10

Ambient Temperature

20

30

40

50

60°C

Output Current

INPUT

Redundancy
M oduleOUTPUT

20A
16
12
8
4
0
10

Ambient Temperature

20

30

40

50

60°C

OUTPUT

Redundancy
M oduleOutput Current

INPUT

Fig. 19-10
Mounting
Orientation E(Horizontal ccw)

20

Output Current

Fig. 19-8
Mounting
Orientation C(Table-top
mounting)

Fig. 19-9
Mounting
Orientation D(Horizontal cw)

Ambient Temperature

20A
16
12
8
4
0
10

Ambient Temperature

20

30

40

50

60°C

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

21/22

YRM2.DIODE
DC24-48V, 20A, DUAL REDUNDANCY MODULE

Y-Series

20.HISTORY
Rev. 1.7

Update: Reverse Voltage

May 2023 / Rev. 1.7 DS-YRM2.DIODE-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0 Germany

22/22