SSB65LE series miniature earth leakage circuit breaker (the "leakage circuit breaker"), which is applicable for the circuit with AC50Hz, rated voltage 230V/400V and rated current up to 63A, is used as indirect contact protection for persons and over-current protection for buildings and circuits with similar applications. It can also provide protection anainst fire hazards from continuously existing grounding failure caused by the malfunction of over-current protection device. The earth leakage circuit breaker with over-voltage protection can also protect against the over voltage arising from electric grid failure.