Patent ID: 7167349
Filing Date: 2007-01-23
Classification: H01H

Abstract:
1. An earth leakage breaker for protecting a main circuit against over-current and ground failure, comprising: a main-body case, a main contact disposed in the main-body case, a switch mechanism disposed in the main-body case and connected to the main contact for turning on and off the same, an operating handle attached to the switch mechanism for operating the switch mechanism, a leakage tripping device disposed in the main-body case for performing a tripping operation, an over-current tripping device disposed in the main-body case for performing a tripping operation, a leakage-detection circuit disposed in the main-body case for detecting a leakage current, a power-supply line connected to the main circuit for supplying voltage of the main circuit to the leakage-detection circuit, and a test switch disposed in the main-body case for turning on and off a power supply circuit of the power-supply line when the switch mechanism turns on and off the main contact, said test switch being associated with the switch mechanism and operable to turn on and off the power supply circuit of the power supply line when the operating handle is actuated to turn on and off the switch mechanism.