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What does "NC" mean for the Seco-Larm SM-407-5TQ/W magnetic contact's operation?

Security, Architectural & Storefront
Electronics
Sensors, Switches, Relays, Timers
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DK Hardware 2026-09-30 - 18:04:23
Technical Team

"NC" stands for Normally Closed, which means the circuit is closed (allowing current to flow) when the magnet is near the contact. The circuit opens (breaks current) when the magnet moves away, typically triggering an alarm.

Product Details

3/8" Diameter Screw-Terminal Magnetic Contact, 3/4" Gap, NC, White
SM-407-5TQ/WSeco-Larm SM-407-5TQ/W 3/8" Diameter Screw-Terminal Magnetic Contact, 3/4" Gap, NC, White
$5.06/Each

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