The 39-405-RED is a momentary, single-pole single-throw (SPST) normally open pushbutton switch from the Series 39 family. It is rated for a resistive load of 150 mA at 28 Vdc and offers a high operational life of 1,000,000 cycles at its rated load. This PC mount switch has a total travel of 0.035 inches and requires an actuating force of 4 (+4/-2) ounces. With its durable construction and reliable butt contact design, it is well-suited for a variety of electronic control applications requiring a high cycle life.