6EP19613BA21 - 

SITOP Redundancy Module: When your application cannot under any circumstance tolerate a 24 V power failure, the Redundancy module provides additional security. Using diodes, the add-on module disconnects two parallel SITOP power supplies, protecting against worst-case scenarios. Should one defective power supply affect another working power pack, the Redundancy module guards against total loss of power. Failure of a single defective power supply no longer compromises safe and uninterrupted supply of 24 Volt power to your application.
Features:

Fast and Easy DIN Rail Mounting

2 Integrated Diodes for Decoupling Two Basic Devices of 5 A to 20 A or One Basic Device of 40 A

Group Signals “Feed-in 1 and 2 o.k.” Via Green LED and Floating Relay Contact (CO Contact)

Settable LED and Relay Switching Threshold from 20 to 25 VDC
Specifications:

Ambient Temperature: 0 to 60°C

Dimensions (W × H × D): 70 × 125 × 125 mm
Certifications: cULus Listed (UL 508, CSA C22.2 No. 107.1), ATEX, Class I, Div 2, Group ABCD