Digital Circuit Breaker Analyzer CBT-3500

Digital Circuit Breaker Analyzer CBT-3500

The CBT-3500 is Amperis’ second generation, stand-alone, digital, microprocessor controlled, circuit-breaker timer.

It measures the elapsed time from the instant a breaker coil is energized to the instant of opening or closing of a circuit-breaker’s dry contacts. In addition to timing a breaker’s contact response time, the CBT-3500 can also time relays or other switching functions that use an initiating trigger voltage (30 - 300 Volts DC or AC).

The timer-triggering voltage starts three independent electronic timers. Each timer is individually stopped by its respective dry-contact closing or opening. The CBT-3500 can fully analyze the timing of all circuit breaker operations (Open, Close, Open – Close, and Close – Open). Timing results are displayed in milli-seconds and cycles on the unit’s back-lit LCD screen and can be printed on the built-in 2.5 inch wide thermal printer.


  • Contact Timing Inputs
  • User Interface
  • Internal Test Record Storage

CBT-3500’s Specifications


Portable digital circuit-breaker analyzer

Physical specifications

16”W x 7”H x 13” D (40.6 cm x 17.4 cm x 33 cm). Weight: 14 lbs. (6.4 Kg)

Input power

100 - 240 vac, 50/60 hz

Dry-contact inputs

3 channels

Trigger input voltage

Open/close: 30 ¬ 300 V, DC or peak AC

Breaker operations

Open, close, open-close, close-open

Timing resolution

±0.1 millisecond; accuracy: 0.05% of reading ±0.1 ms


Back-lit LCD screen (128 x 64 pixels); viewable in bright sunlight and low light conditions


Rugged, 44-key "QWERTY" membrane keypad


Built-in 2.5-inch wide thermal printer

Internal test record storage

Stores up to 128 timing records

Computer interface

One USB PC interface, one USB Flash drive interface

Pc software

Windows® based Breaker Analysis software included with purchase price


Designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards


Operating: -10°C to +50°C (+15°F to +122°F); Storage: -30°C to +70°C (-22°F to +158°F)


90% RH @ 40°C (104°F) non-condensing


2,000 m (6,562 ft) to full safety specifications

Included Accessories

Furnished with full set of test leads (including 20-foot contact leads and 30-foot contact lead extensions). Cable carrying bag

Optional accessories

Transportation case


1 year on parts and labor

NOTE: the above specifications are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifications are subject to change without notice

Controls Digital Circuit Breaker Analyzer CBT-3500Connections Digital Circuit Breaker Analyzer CBT-3500Test results Digital Circuit Breaker Analyzer CBT-3500

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