Edwards Signaling 503A Door Light Switch

For reliable door-status monitoring in fire alarm and security installations, the Edwards Signaling 503A Door Light Switch delivers straightforward, dependable performance. As a purpose-built fire alarm control panel accessory, this hard-wire switch lets technicians quickly detect door position for monitoring, access control, or surveillance integrations. The 503A supports selectable normally open (NO) or normally closed (NC) wiring, giving you the flexibility to match existing system logic without extra components. It mounts using standard 3 1/4" (83 mm) center holes for easy retrofit into panels or enclosures, and its painted gray faceplate provides a clean, professional finish that blends with control equipment. Built for long-term reliability in security and fire monitoring environments, the Edwards 503A reduces installation time and simplifies routine checks. Ideal for integrators, facilities managers and service technicians who need a compact, durable door switch for fire alarm, security and access control projects. Order the Edwards Signaling 503A to streamline installations and enhance door monitoring—perfect for upgrading control panel accessories in commercial and institutional systems.

• Provides dependable door status monitoring for fire alarm, security and access control systems
• Selectable normally open (NO) or normally closed (NC) wiring for installation flexibility
• Universal mounting on 3 1/4" (83 mm) centers for fast retrofit and panel compatibility
• Painted gray faceplate offers a low-profile, professional appearance that integrates with control panels
• Simple hard-wire design minimizes installation time and reduces maintenance in critical monitoring applications