BM-63GQ series mini-circuit breakers with over-current, over-voltage and under-voltage protection are suitable for ac 50Hz/60Hz, rated working voltage 230V/400V, rated current up to 63A power supply lines.When the line voltage is greater than 275 (±- 5%)V or less than 160 (± - 5%)V, and when the line facilities and electrical equipment over current or short circuit protection, can also be used for infrequent combined operation.