Page 526 - IRSEM_Main Book

8.0 ECR Relays

(a) Relays of an approved type shall be used.

(b) Plug-in type Line relays of Neutral/Polar Biased/Magnetic latch/Interlocked type
rated at 24/48/60 V DC shall normally be used. Suitable type of LED Lamp
proving relays (QECX-61) are used for signal LED lamps to meet with parameters
to suit various LED lamps.

(c ) Universal Plug-in-type, Tractive armature AC lamp proving - Metal to carbon
contact Relay, as per RDSO specification STS/E/Relays/AC Lit LED Signal/09-2002
(Amdt1) & BRS- 941A shall only to be used for 110V AC LED Lamp units.

(d) The important parameters of LED lamp proving relays:
(i) ECR pickup current = 108 mA/AC, 50Hz.

(ii) ECR Drop away current = 72 mA/AC, 50Hz.

(iii) This ECR withstands for a continuous current of 250 mA/AC 50Hz.
(iv) Contact configuration: 4F-4B identically in A to D rows.

(v) Voltage drop across R1 and R2 is less than 10 V @ 125 mA/AC (normal
working current).

Chapter 21: Relay & Electronic Interlocking Page 469 of 535