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Concept
The power relay SR853 is designed to separate non
intrinsically safe feed lines, for instance in combination with a
pressurized enclosure system.
The power relay can be placed in hazardous area, Ex- Zone 1
respectively Ex Zone 21.
Safe switch off
For this purpose the SR853 has 4 gavanically separated relay
contacts, which open if the control voltage is low. The opening is safe
with one fault (acc EN 954-1, cat 3), because there are two independent
serial relay contacts for each line.
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Switch power: 4kW
The four relay contacts combined with the high switch power
(400 V, 16 A, 4 kW) can disconnect a three-phase system with one
compact unit.
Simple cascading
Using the terminal pairs 1/2/3 and 26/25/24 it is possible to
cascade several power relay units.
Modular assembly
The SR853 is available as
- build in compact Ex e terminal box
- Module without housing for mounting inside of a separate
certificated Ex e housing
- optional for mounting on a 35 mm rail acc. EN 50022.
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