CBT-1203 Circuit Breaker Timer Test Set

The CBT-1203 circuit breaker timer test set is an accurate, portable, and easy-to-use tool that confirms proper breaker speed and clearing times as part of a maintenance program or arc-flash validation study. It performs 3-phase timing tests, charges spring-charged circuit breakers, opens/trips and closes breakers, and captures and stores millisecond trip and close times and duration of contact bounce.

With the integrated variable 120V AC/125V DC power supply, the CBT-1203 can operate breakers outside of cubicles. Breaker-switching controls and custom breaker-specific operation plugs allow users to quickly set up and operate the unit with all types of circuit breakers. The large back-lit LCD display is viewable in sunlight and low-light conditions.

The compact and lightweight unit measures 16.5 x 7 x 13.5 in. and weighs 19 lb., making it ideal for use in the shop or field. The test set includes the circuit breaker timer, control power, and contact leads, a universal breaker operation cable, contact clamps, an input power cable, and a durable storage bag.


  • Operate and interact with all types of circuit breakers
  • Digital timer captures breaker trip, close, and bounce times
  • Integrates variable 120V AC/125V DC power supply for charging breakers outside of cubicles
  • Distributes other voltages from an external variable power supply
  • Switching to open/trip and close a breaker
  • Breaker-switching controls and custom breaker specific operation plugs provide a simple, fast connection to the breaker
  • Large back-lit LCD display viewable in sunlight and low-light conditions

Vacuum Interrupters, Inc.
Farmers Branch, TX
(214) 442-5877

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