| 摘要 |
PROBLEM TO BE SOLVED: To provide a contact type electric switch device, the safety of which is enhanced.SOLUTION: An electrical apparatus 12, becoming a load, is connected with a power supply device 2, via respective output terminals 4, 5 of the interlock switch of two circuits, and silicon diodes 8, 9, and an audio device 14 is connected between the output terminals of the interlock switch.EFFECT: Upon occurrence of poor contact in any one contact of the interlock switch, an abnormality alarm is issued from the audio device before the interlock switch fails completely, while maintaining the function of the switch by the other contact.SELECTED DRAWING: Figure 1 |
