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Physical Properties of 400 Series Relays
3.1 Case
The 400 Series case is made of a special alloy in stainless steel. It is covered with modern
PVC coating technique. The terminal blocks are fixed to the rear of the box.
3.2 “Phase Fault” LED
functions. The Trip LED runs continuously as long as the trip contact is in closed position,
while flashing until reset if the CB is tripped by the relay and the disturbance is cleared.
3.3 “Earth Fault” LED
3.4 Trip LED
Trip LED indicates trip operations triggered by any of the active protection functions. LED
3.5 Alarm LED
Alarm LED indicates abnormal states of the protected circuits, and is triggered by any of the
active alarming functions. LED behaviour is configurable.
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