C B TIMER is a very compact and portable instrument which compromises of three nos. Programmable Time Interval Meters with necessary terminals, switches, indicators and miniature relays housed in a sunmica laminated wooden box. Two pairs of terminal are provided for DC supply (Input) and Trip/Close coils while three pairs of terminals for three “CONTACTS” (viz. Main/resistor/ auxiliary) of the Circuit Breakers. The CB Timer operates on 230 V AC mains supply. The T.I. Meters automatically record the trip/close timing of each of the contacts, with memory retention of 10 years.