The use of two TD-5 units allows utilization of two completely independent timing circuits for such applications as primary and back-up relaying systems.
The telephone type output relay contacts are suitable for circuit breaker trip duty. Two sets of transfer contacts adapt the relay to various circuit arrangements.
- Can be used as the timing relay forzone 2 and zone 3 in conventional line distance phase relaying
- Can be used for beaker failure relaying for two breakers