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The SDC - SECURITY DOOR CONTROLS MSB550-2B is a switch assembly designed for use in exit device applications. This component serves as a functional replacement or service part within door hardware systems that require reliable electrical switching at the exit point. Typically installed by commercial door hardware technicians or licensed electricians, the MSB550-2B provides the switching mechanism that enables monitoring or actuation functions integrated into the exit device assembly. It is sold as an individual unit, making it a direct service replacement for field repairs or system upgrades.
The MSB550-2B is suited for commercial door applications where exit devices require switch-based electrical integration. Common install scenarios include access control tie-ins, door position monitoring, and alarm-linked egress hardware in commercial or institutional buildings. It is intended for use as part of a complete exit device assembly rather than as a standalone door hardware component.
Designed as an OEM-style replacement switch assembly for commercial exit devices requiring integrated switching components.
Installation of this switch assembly should be performed by a qualified door hardware technician or licensed electrician familiar with exit device systems. Disconnect power to any electrified door hardware and disarm any connected access control or alarm circuits before beginning work. Follow applicable local codes and manufacturer documentation for proper integration into the exit device assembly. Verify switching function and circuit continuity after installation before returning the door hardware to service.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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