info@amperis.com (+34) 982 20 99 20
The AMCCB-250 is a programmable, high-current source designed specifically for testing molded-case circuit breakers as well as thermal, magnetic, or solid-state overload motor-protection relays.
Built-in Timer
The AMCCB-250’s built-in timer can test the time-delay characteristics of protection relays and molded-case circuit breakers. Once the test is initiated, the current source and the timer are automatically turned on at the next zero-crossing point of the AC. The timer stops when the AMCCB-250 input detects a change in the dry contact or voltage input, or detects the removal of the test current. The test results are then displayed in milliseconds and fractions of cycle(s) on the unit’s back-lit LCD screen (20 characters by 4 lines).
External Current Input
The AMCCB-250 also provides an external current input (0 – 10 A). Both internal and external current source readings can be viewed at the same time.
Current Source
The AMCCB-250 has 4 current-source outputs (5 A @ 120 Vac, 25 A @ 24 Vac, 120 A @ 6 Vac, 250 A @ 3 Vac) that conduct the test current through the high-impedance load circuits. Each current source can tolerate short duration over-loads up to 4 times the rated current (1000 A max). This feature is used for testing the instantaneous trip element of molded-case circuit breakers. When using this feature, the selected test current is displayed on the LCD screen. When the MCCB-250 is used as a current source, the current flow time (the current-on period) is displayed on the LCD screen.
AMCCB-250 Output Current and Duration Table
Current |
On time |
Off time |
100% (1x) |
30 minutes |
30 minutes |
200% (2x) |
3 minutes |
5 minutes |
300% (3x) |
30 seconds |
4 minutes |
400% (4x) |
4 seconds |
7 minutes |
Complete specifications table
Type |
250 Ampere current source |
Physical specifications |
17"W x 12K"H x 10K"D (42.6 cm x 32cm x 27 cm). Weight: 46 lbs (21 kg) |
Input power |
100 - 120 Vac or 200 - 240 Vac (factory pre-set), 50/60 Hz |
Output currents |
0 - 5 A @ 120 Vac max; 0 - 25 A @ 24 Vac max; 0 - 120 A @ 6 Vac max; 0 - 250 A @ 3 Vac max |
Internal current meter |
100 mA - 1000 A; Accuracy: 1% of reading ±20mA |
Measurement method |
Isolated CT |
External meter range |
10 mA - 10 A; Accuracy: 1% of reading, ±2mA |
Timer reading range |
1ms - 2 hours; Accuracy: 0.1% of reading ±1ms |
Timer stop inputs |
Voltage input (24V - 300V, DC or peak AC), dry contact input, or removal of primary current |
Display |
Back-lit LCD Screen (20 characters by 4 lines); viewable in bright sunlight and low-light levels |
Computer interface |
RS-232C port for factory calibration and diagnostics |
Safety |
Designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 standards |
Environment |
Operating: -10°C to +50°C (+15°F to +122°F); Storage: -30°C to +70°C (-22°F to +158°F) |
Humidity |
90% RH @ 40°C (104°F) non-condensing |
Altitude |
2,000 m (6,562 ft) to full safety specifications |
Cables |
Power cord, ground cable, 10-foot #2 AWG test leads |
Options |
Transportation case |
Warranty |
1 year on parts and labor |
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.