The 39-405-BLK is an SPST normally open, momentary action pushbutton switch designed for PC mounting. It features a black button and is rated for 150 mA at 28 Vdc with a resistive load. This durable switch provides a long operational life of 1,000,000 cycles at its rated load. Key mechanical characteristics include an actuating force of 4 (+4/-2) oz and a total travel of 0.035 ± 0.015 inches. Its compact size and PC mount design make it ideal for various user interface applications in electronic equipment.