The power relay SR853 is designed to separate non intrinsically safe feed lines for instance in combination with a purging system; inside hazardous areas.

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.

Switch power: 4kW
The four relay contacts combined with the high switch power (420 V, 16 A, 4 kW) can disconnect a three-phase system with one compact unit.

Simple cascading
Using the terminal pairs 1/2 and 12/13 it is possible to cascade several power relay units.

Properties

• Mounting direct in hazardous area
• Ex- protection: EEx e m II T6
• Four galvanically separated contacts
• Switches 420V, 16 A, 4000 VA
• Compact design
• According to EN 954-1, cat. 3
• simple cascading
• max cable diameter: 4 mm²