Unique-Bargains OC-55 NC magnetic reed alarm 40-50mm 0.5A 100V 50cm

Magnetic Reed Switch for Alarm Systems

The Unique-Bargains OC-55 is a normally closed magnetic reed switch designed for security alarm circuits on doors, windows, rolling gates and garage doors. It suits installers and DIY users who need a simple contact sensor that closes the circuit when the magnet is within roughly 40-50mm and opens it when separated.

Screw Surface Mount with 50cm Leads

Each unit includes a zinc alloy housing and a stainless steel pipe that mount with screws through 5.33mm holes. The 1007UL#22AWG wires run 50cm from each component, giving enough length for typical frame-to-door runs. Misalignment beyond the 40-50mm actuation gap is the usual cause of false opens, so verify the magnet sits squarely opposite the reed before final tightening.

Rated for Continuous 0.5A at DC100V

The contact handles a maximum of 0.5A and 10W at DC100V, so it remains stable under sustained alarm-loop current rather than only brief pulses. The normally closed logic means the circuit stays conductive while the door is shut, and any sustained separation — whether from intrusion or a loose magnet — breaks the loop and triggers the panel.