Indicator lamp one-key test circuit

The utility model provides an indicating lamp one-key test circuit. Comprising a host, a test switch S2, a first relay K1, a second relay K2 and a third relay K3, the circuit is arranged in the host, the test switch is used for controlling the relays, the relays control on-off of power supplies of a tested indicating lamp and the test circuit, a test power supply and a host power supply are isolated through the relays, and the safety of the host circuit is improved; and the indicator lamp in the host can be tested by one key through the test switch, and the test is convenient and efficient. 本实用新型提供了一种指示灯一键测试电路；包括主机、测试开关S2、第一继电器K1，第二继电器K2、第三继电器K3，本实用新型通过在主机内配制该电路，使用测试开关控制继电器，继电器控制被测指示灯和测试电路的电源通断，通过继电器将测试电源和主机电源隔离，提高主机电路的安全性；并且通过测试开关实现一键对主机内部指示灯进行测试，测试方便高效。