Functional Devices RIB2421B Enclosed Relay 20A SPDT with 24V AC/DC/120V AC/208-277V AC Coil

Deliver dependable control and simplify installations for security, surveillance and building automation with the Functional Devices RIB2421B enclosed relay. This 20A SPDT relay is built to handle mains and auxiliary loads—ideal for power supplies, alarm circuits, access control and monitoring systems. The multi-voltage coil accepts 24 VAC/DC, 120 VAC or 208–277 VAC, reducing the number of spare parts you need on site and supporting diverse controller outputs. UL-listed to UL916 (Energy Management) and UL864 (Fire), the RIB2421B meets common regulatory requirements for safety and fire-panel applications. Its compact enclosed housing and screw-mount form factor protect components and save panel real estate, while color-coded leads cut wiring time and lower installation errors. With a low-current coil draw and 20A contact rating, this relay delivers efficient, long-lasting switching performance for both intermittent alarm duty and continuous monitoring. Specify the Functional Devices RIB2421B for reliable, code-compliant switching in security, surveillance and building management projects—order now or contact our sales team for application support and volume pricing.

• Reliable heavy-duty switching: 20A SPDT contacts provide dependable control for alarms, power supplies and auxiliary loads in security and building systems
• Wide coil voltage compatibility: accepts 24VAC/DC, 120VAC and 208–277VAC to reduce SKUs and simplify installations
• UL-listed for code compliance: UL916 (Energy Management) and UL864 (Fire) approvals for use in monitoring and fire/security applications
• Faster installation and service: enclosed, screw-mount design with color-coded leads minimizes wiring errors and saves panel space
• Low coil current and robust construction: efficient operation reduces drive requirements and delivers long-term reliability under continuous monitoring duty