Momentary Push Button Switch (Panel Mount Push Button)-3A This is a normally open button 3A 125V Momentary Push Button Switch OFF-ON Horn Red. A push-button switch is a small, sealed mechanism that completes an electric circuit when you press on it. When it’s on, a small metal spring inside makes contact with two wires, allowing electricity to flow. When it’s off, the spring retracts, contact is interrupted, and the current won’t flow. Material: plastic and metal, Operating Voltage: 125~250V, Current Rating: 3A, Contacts configuration: SPST, Switch method: Pushbutton, Switch Contact Type: Normally Open (N.O), Mounting Type: Panel Mount, Leads: Solder lugs, Color: Red.