Digital Circuit Breaker Analyzer CBT-8000

Digital Circuit Breaker Analyzer CBT-8000

The CBT-8000 is Amperis’ fourth generation EHV circuit breaker analyzer. The CBT-8000 is available with 3 or 6 contact timing channels. The CBT-8000 can fully analyze a circuit breaker’s performance by measuring the main contact and resistor contact time, stroke, velocity, over-travel, bounce back and contact wipes.

Also, an outstanding feature of the CBT-8000 is the ability to perform dynamic resistance tests on circuit breaker contacts.


  • Dynamic Contact Resistance
  • Contact Timing Input Channels
  • Resistor Type Transducer Inputs
  • Breaker Stroke and Velocity
  • Voltage Monitoring Channels
  • Breaker Initiate Features
  • OPEN/CLOSE Coil Current Monitoring
  • Computer Interface
  • Built-in Thermal Printer
  • Diagnostic Capabilities
  • Internal Test Record and Test Plan Storage
  • User Interface

Optional Features

  • “On-line” Timing Mode
  • Dual Ground Testing Mode
  • Bluetooth Interface

CBT-8000 Specifications


Portable Circuit Breaker Analyzer

Physical specifications

16”W x 11”H x 14”D (40.6 cm x 29.9 cm x 35.6 cm). 22 lbs (9.98 kg)

Input power

100-240Vac, 3A, 50/60Hz

Dry-contact inputs

3 channels (9021-UC) or 6 channels (9100-UC). Channel can detect the main contact and resistor contact time.

Timing windows

1 second, 10 seconds, or 20 seconds

Timing resolutions

±50 micro-seconds @ 1 sec. duration, ±500 micro-seconds @ 10 sec. duration, ±1.0 milli-seconds @ 20 sec. duration

Timing accuracy

0.05% of reading ±0.05 ms @ 1 second duration

Dry-contact cannel protection

All contact inputs are grounded until test. Input channels are also protected against static discharge

Dry-contact detection range

Closed: Less than 20 Ohm. Opened: greater than 5000 ohm

Insertion resistor detection range

50 - 5,000 ohms

Trigger input voltage

Open/Close trigger voltage: 24 V – 300V DC or peak AC

Voltage sensing input range

V1: analog input; 0 - 250 V DC or peak AC; sensitivity ±1 V; record and print voltage level

V2 and V3: voltage presence/absence detector input; 24 - 255 V DC or peak AC; record and print 3 timing events

Breaker operations

Initiate Open, Close, Open-Close, Close-Open, Open-Close-Open

Breaker initiate capacity

30A, 250 Vac/dc max

Initiate current reading range

one, non-contact, Hall-effect sensor, 0 - 20 amp range, dc to 5 Khz AC

Digital travel transducer inputs

3 digital travel transducer channels; linear range: 0.0 - 60.0 in (±0.01 in) rotary range: 0 - 360 degrees (±0.36 degrees)

Resistor type transducer inputs

3 channels, 200 ohm – 10K ohms

Contact travel point difference

Measures “slow-close” contact-point distances; results can be printed

Dynamic/static resistance range

0.1 - 1,999 micro-ohms; accuracy: ±2% of reading, ±5 micro-ohms

Resistance test current

200 amperes max


Back-lit LCD screen (128 x 240 pixels); viewable in bright sunlight and low light


Built-in 4½” wide thermal printer that can print both graphic contact travel waveforms and tabulated test results

Internal test record storage

Store up to 200 test records and 100 test plans

External test record storage

USB Flash drive interface for external storage of test records and test plans

Computer interfaces

One USB port, optional Bluetooth wireless interface

Pc software

Windows® based Breaker Analysis software included with purchase price


Furnished with full set of test leads


Transportation cases (available for the CBT-8000 and travel transducers), on-line timing mode, dual ground testing mode, bluetooth interface


Designed to meet UL 6101A-1 and CAN/CSA C22.2 No 1010.1-92 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


One year on parts and labor

Optional Testing Features



On-line current sensor

Three non-contact AC current sensors, range 0-100 amperes

On-line dc current sensor

One non-contact DC current sensor, range 0-20 amperes



Dual ground clamp-on probes

3 non-contact clamp-on probes

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

Typical CBT-8000 Dynamic ResistanceConnections for Optional Dual Ground TestingConnections for Optional Online TimingThermal printout of graphic test resultsThermal printout of tabulated test resultsThermal printout of graphic test results

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