IEC 60898-1 Clause 9.11 Circuit Breaker Mechanical And Electrical Life Tester Endurance Test

The IEC 60898-1 Clause 9.11 Circuit Breaker Mechanical and Electrical Life Tester is designed to verify the endurance performance of miniature circuit breakers (MCBs) and residual current devices. The equipment conforms to the standard requirements of IEC 60898-1:2015 clause 9.11, IEC 61008-1 / IEC 61009-1 clause 9.10, and related specifications.

It is primarily used to test the mechanical and electrical endurance of miniature circuit breakers. An independent control system consisting of a PLC and touch screen is adopted to realize automatic control of the test samples. Full-automatic control technology is applied during testing, enabling statistics and summarization of test cycles, with both closing time and opening time fully configurable.

The cabinet is fabricated by welding high-quality sheet metal and square tubes, with a sheet metal enamel finish for encapsulation. A touch screen and programmable logic controller (PLC) serve as the main control unit, while an electric cylinder acts as the driving power to perform closing and opening operations on the circuit breaker. The driving speed is adjustable for circuit breakers with automatic closing and opening functions.

1. Mount the sample on the mounting bracket specified in Clause 9.2 and connect the wires as required.
2. Adjust to the rated voltage and current of the sample through an external load (SN2117C-80), with the power factor between 0.85 and 0.9.
3. Set the test frequency, test speed, and test times.
   • Test frequency: For circuit breakers ≤ 32A, the test frequency is 240 cycles/h, with each breaking time no less than 13 seconds. For circuit breakers > 32A, the test frequency is 120 cycles/h, with each breaking time no less than 28 seconds.
   • Test speed: 0.1 m/s ± 0.025 m/s
   • Test times: 4000
4. Start the test. The test ends when the set number of tests is reached or no current passes, and the current number of tests is recorded.

1. Secure the sample to the mounting fixture or the rail and connect the wires as required.
2. Adjust to the rated voltage and current of the sample through an external load (SN2117C-80), with the power factor between 0.85 and 0.9.
3. Set the test parameters in accordance with standard requirements.
   • For I△n > 0.010A: In ≤ 25A RCCB, test frequency is 4 cycles/min, with each on time 1.5~2 s. In > 25A RCCB, test frequency is 2 cycles/min, with each on time 1.5~2 s. Test times: 1000 (forced opening and closing driven by the equipment manipulator), 500 (forced opening and closing driven by the equipment manipulator), 500 (apply residual current to trip the circuit breaker, reset the residual current device via the air cylinder, and close the breaker using the equipment manipulator).
   • For I△n ≤ 0.010A: In ≤ 25A RCCB, test frequency is 4 cycles/min, with each on time 1.5~2 s. In > 25A RCCB, test frequency is 2 cycles/min, with each on time 1.5~2 s. Test times: 500 (forced opening and closing driven by the equipment manipulator), 750 (forced opening and closing driven by the equipment manipulator), 750 (apply residual current to trip the circuit breaker, reset the residual current device via the air cylinder, and close the breaker using the equipment manipulator).
4. Turn off the external load and perform the mechanical endurance test. In ≤ 25A RCCB, test frequency is 4 cycles/min, test times: 2000. In > 25A RCCB, test frequency is 2 cycles/min, test times: 1000.
5. Start the test. After pressing the "Start" button, the test will be conducted automatically. The test ends when the set number of tests is reached or no current passes (non-mechanical endurance test), and the current number of tests is recorded.