Description

MC-38 Magnetic Door and Window Contact Switch, Normally Closed

This magnetic contact switch detects the opening of a door, window, drawer or similar opening. Mount one part on the frame and the other on the moving part. With the two pieces close together, the normally closed (NC) contact is closed; when they separate, the contact opens and can trigger an alarm or another connected circuit. The switch does not require an external power supply.

Specifications stated in the source listing

Material: flame-retardant ABS, as stated by the seller
Contact mode: normally closed (NC)
Rated current: 0.5 A
Rated power: 3 W
Operating distance: under 15 mm: contact closed; over 15 mm: contact open. The source does not specify the state at exactly 15 mm.

The source gives a current and power limit but no voltage rating. Confirm that the switch is suitable for the voltage and load in your circuit; do not connect it directly to mains wiring.

Keywords: MC-38, magnetic door contact, door sensor, window sensor, NC switch.