What is self-locking and reset:Self-locking: The switch is locked and then bounced back.Reset: Press the hand to power up, then press break.Describes:Rated range: AC250V 0.5A DC250V 0.5AContact mode: A normally open contact (double break point slow-moving contact switch with two terminals)Electrical life: more than 100,000 timesMechanical life: more than 200,000 timesElectrical strength: AC2000V 50Hz/60HzFeatures:This product is a welding switch, welding iron temperature should not exceed 300 degrees, contact time should not exceed 1 second. Can be widely used in low - current door bells, access control, equipment start - up and tap start switch.Reset switch, press power, let go of power. Package:1pc switch1pc nut 1pc waterproof ring