Molded Case Circuit Breaker and Relay Tester AMCCB-500

Molded Case Circuit Breaker and Relay Tester AMCCB-500

The AMCCB-500 is a microprocessor-based high current circuit breaker test set. This unit provides a variable high current source, control, metering, and timing circuitries for testing overload relays and thermal and magnetic circuit breakers.

  • 3 Current Source Output
  • Instantaneous output of 2600A – for testing higher fault currents
  • Testing Molded-Case Circuit Breakers
  • Testing Thermal, Magnetic, Or Solid-State Relays
  • LCD screen

Current Source

The AMCCB-500's current source has 3 outputs: 500A @ 4 Vac, 125A @ 14Vac, and 25A @ 70Vac. The current sources can output short-duration overload conditions. This feature is convenient for performing instantaneous trip tests of molded case circuit breakers, or testing the time delay characteristics of magnetic overload relays.

Test current is measured and displayed on a 128 x 64 pixel back-lit LCD screen that is clearly visible in direct sun light or low light levels. Control switches are used to turn the current source on and off, select the timer stop input type (current mode, dry contact, or wet contact), and control the LCD contrast.

A "momentary" mode can turn on the current source, capturing the current reading and displaying the value on the LCD. This feature can be used to set the test current and minimizes the possibility of overheating the device under test.

Test current is turned on at the zero crossing point using a solid state device for reliability and precision timing.

Current Source Thermal Protection

Built in thermal sensor allows the microprocessor to monitor the transformer current source operating temperature.

Built-in Timer

The AMCCB-500's built-in timer displays the test results in milliseconds and cycles. The cycle time (50 or 60 Hz) is selectable by the user. Timer reading range is from 0.1 ms to 2 hours. Timer resolution is 0.1 ms and the timer accuracy is ±0.1% of reading, ±0.1 ms.

Built-in Current Meter

The AMCCB-500 features a built-in current meter that displays the test current (100mA - 3000A). Current reading accuracy is: ±1% of reading, ±2 digits. Test results (current reading and time) are retained after performing a test so that the test results can be reviewed. This is a convenient feature when used with the momentary mode to preset the test current to avoid overheating the circuit breaker.

Timer Start Mode: Timer can be started when the current source is turned on or off.

Timer Stop Mode: Timer can be stopped with the removal of the test current or detection of a status change of dry contact or voltage input.

AMCCB-500 Output Current and Duration Table


Max On time

Max Off time

40% (200 A)



100% (500 A)

30 minutes

30 minutes

AMCCB-500’s Specifications


500 Ampere current source

Physical specifications

16”W x 14”H x 13” D (40.6 cm x 35.5 cm x 33 cm). Weight: 93 lbs. (42.2 Kg)

Input power

100 - 120 Vac or 200 - 240 Vac (factory pre-set), 50/60 Hz

Output currents

500A @ 4V, 125A @ 14V, 25A @ 70V

Internal current meter

1 A - 3000A; accuracy: 1% of reading, ±2 digits

Measurement method

Isolated CT

Timer reading range

0.1ms - 2 hours (also displayed in cycles); accuracy: 0.1% of reading, ±0.1ms

Timer stop inputs

voltage input (20V - 300V, dc or peak ac), dry contact input, or removal of test current


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


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


2000 m (6,562 ft) to full safety specifications


two 5-foot (1.5m) #2/0 current cables, two 8-foot (2.5m) external timer input cables with alligator clips, one ground cable, one power cord

Furnished 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

Test resultsDetails Molded Case Circuit Breaker and Relay Tester AMCCB-500Controls Molded Case Circuit Breaker and Relay Tester AMCCB-500

Do you want to buy high quality Switch testing?

Inquire for our Switch testing prices.

Do not hesitate to contact us, call us today by phone (+34) 982 20 99 20. We are happy to help you.