A 'push to make' switch allows electricity to flow between its two contacts when held in . When the button is released, the circuit is broken. This type of switch is also known as a Normally Open (NO) Switch. Specifications: Brand: CNTD Model: CBSP-315 1 ON Black + 1 OFF Red Maintained Pushbutton Rating: 15A, 2.2kW, 3P Size: 2" x 3.2" x 2" Wiring hole: 3/4" in diameter