When failure is not an option:
Single Redundancy Module

Data sheet

SLR02• Easy set-up of N+1 redundancies
on the DIN-Rail• Decoupling diodes• Ready relay contacts• For use with 24...28V power supplies up to max. 35A

Short description
When failures might cause cost extensive downtimes, you should design
a redundant power supply by using several (N+1) identical power supplies.
The redundancy module SLR02 is designed to create an N+1 redundancy
in combination with the PULS 24...28V power supplies units SL10, SL20or SL30 or other 24...28V power supplies with an output current of up to30A (max. 35A). One SLR02 is required for two power supply units. Themodule decouples the power supply outputs from each other, so that incase of failure one power supply unit cannot overload the other power

supply units.
A relay-changeover contact, picked up under normal conditions anddropped in case of failure, indicates the status of each connected power
supply unit.
A Single Redundancy Module, the SLR01, is available to design a redundancy with one attached power supply unit and an output current of upto 40A (max. 50A). For smaller current values of 2.5A, 5A and 10A PULS
also offers the SLR2, SLR5 and SLR10 power supplies with integrated redundancy modules.

Decoupling part

Relay contacts

Voltage• nominal value• max. rated

Relay type
24 V DC
35 V, short-term 45 V

Voltage drop
Vin → Vout

typ. 0.5 V

Current per input• nominal value• max. rated

20-30 A
35 AOutput current• nominal value• max. rated

20-30 A
35 A

Parallel operation for increasing the power is only permissible if the total output current cannot exceed the maximum rated value of 35A(danger of overloading).
Inverse battery
protection

yesConnection• Connector size
range

via stable screw terminals
solid: 0.5 - 6 mm2
flexible: 0.5-4 mm2

Note: The GND connector on the module exclusively serves as intrinsic
power supply

Construction / Mechanics*
Housing dimensions and Weight
48 mm x 124 mm x 102 mm (+ DIN Rail)• WxHxD
above/below 10 mm recommended• Free spaceleft/right 10 mm recommended
for ventilation
625 g• Weight
Design advantages:• All connection blocks are easy to reach as mounted at the front
panel

Changeover contact, picked-up during normal
operation• relay picks up („ok“) when Vin between Vlow and Vhigh• relay drops out
when Vin < Vlow or Vin > Vhigh
30.7 V
30.0 VHysteresis
drops out
picks up22.0 V
21.3 Vpicks updrops out

Upper limit Vhigh• hysteresis

30 V ± 5% fix
appr. 0.7 VLower limit Vlow
• guaranteed range• preset• hysteresis

adjustable
16...27 V
22 V ± 1%
appr. 0.7 VContact load

28 V DC / 1 A or 120 V AC / 0.5 AConnection• connector size
range

via stable screw terminals
solid: 0.5 - 6 mm2
flexible: 0.5-4 mm2

Not OKOKNot OK

LEDs on the front panel• for inputs
green LED, when Vin between Vlow and Vhigh• for output
green LED, when Vout > appr. 2.5...3.5 V
Note:• All relay contacts are potential-free.
• The SLR02 includes two of these relay contacts, each per input.

Further information
Test voltage• relay cont., Vin, Vout 500 V AC
• Vin, Vout / housing 500 V AC
Ambient temperature
range Tamb

Operation: -10°C...+70°C
Storage: -25°C...+85°C

Efficiency> 97 %*For further information see data sheets „The SilverLine“, „SilverLine
Family Branches“

Order information

slr02e / 040204

Order numberDescription

SLR02
SLZ02

Single Redundancy Module(Screw mounting set, two needed per unit)
1/2

SLR02

Data sheet
Power wiring SLR02

Side view SLR02
GND

SL20 or SL30+ + – –+24V

SLR02
Vin Vout GND
1 2

SL20 or SL30+ + – –Front view SLR02

Bottom view SLR02

Further information, especially about EMC, Connections, Safety, Approvals, Mechanics and Mounting,see page 2 of „The SilverLine“ data sheet.
Unless otherwise stated, specifications are valid for AC 230V input voltage, +25°C ambient temperature, and 5 min. run-in time. They are subject to change without prior notice.

Your partner in power supply:

EuropeanPower Supply
Manufacturers
AssociationBayerns Best 50
Czech 100 Best
Europe’s 500

PULS GmbH
Arabellastraße 15D-81925 München
Tel.: +49 89 9278-0
Fax: +49 89 9278-199
www.puls-power.com

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slr02e / 040204