DCTR-1B Impedance Relay
Manufacturer: Whipp & Bourne Ltd.
The Whipp and Bourne DCTR-1B is an impedance and undervoltage relay used on some electrified sections operated by Network Rail in the United Kingdom.
Cephos Electronic Circuits Ltd has been modifying, repairing and testing this impedance / undervoltage relay since 1999
The dynamic and static testing of the DCTR-1B relay is undertaken using an original DCTR-2TE test set and the test procedure set out in C001 Issue B May 1999 together with a unique modified Simulated Circuit Breaker DCTR-2SB which has light emitting diodes to indicate the condition of the on-board signal relays which are showing trip, alarm, fault and track-alive status.