Vanguard MCCB-250 Molded Case Circuit Breaker Tester

9066-UC 110V MCCB-250 unit and cables The MCCB-250's built-in timer can test the timedelay 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 MCCB250 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.

The MCCB-250 also provides an external current input (0 – 10 A). Both internal and external current source readings can be viewed at the same time. Over-Current and Duration Table

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