Megatronix - MGT - Magnetic Reed Switch Sensor Normally Open (N/O) / Normally Closed (N/C) Operation: Normally open (N/O) / normally closed (N/C) Operating gap: 1" maximum Switching current: 0.25 A Switching voltage: 100 VDC Dimensions: 2.75"L x 0.75"W x 0.75"H