MS-DPDT Buckeye MicroSwitch

The Buckeye MS-DPDT is a double-pole, double-throw microswitch for use in Buckeye kitchen fire suppression systems, providing electrical interlock and shutdown functions during system discharge. The DPDT configuration gives the Buckeye control head two independent switch contact sets — allowing coordinated control of two separate electrical circuits simultaneously when the suppression system activates. Common applications include cooking appliance power shutdown, exhaust fan shutoff, alarm signalling, and other auxiliary interlocks required by NFPA 96 for commercial kitchen fire suppression systems.

The dpdt micro switch design is the industry standard for kitchen suppression system auxiliary interlocks because it provides the most flexible wiring configuration — each pole's normally-open and normally-closed contacts can be used independently for energize-to-activate or de-energize-to-activate circuit control. This makes the MS-DPDT suitable for both appliance shutdown applications (where the switch must open the power circuit) and alarm applications (where the switch must close a signalling circuit). The Buckeye fire suppression system manual provides wiring diagrams for both configurations with the MS-DPDT switch.

For fire protection contractors installing Buckeye Kitchen Mister (BFR) systems, the MS-DPDT is the OEM microswitch available through authorized buckeye fire distributors. Semi-annual testing per NFPA 17A and NFPA 96 must verify both switch poles actuate correctly during a simulated system discharge — a failed switch contact is a code deficiency that must be corrected before the system can be returned to armed service. Keep the MS-DPDT in your buckeye parts inventory alongside the Buckeye RPS-M pull station and BFR discharge adapter kit for complete Buckeye system service coverage.

Wiring Configuration

Wire the MS-DPDT per the buckeye kitchen fire suppression system manual wiring diagram. Assign each pole to the correct auxiliary circuit based on the system design drawings — verify polarity and contact state for each circuit before completing the installation. Document all switch wiring assignments in the system installation record for reference during future service visits.

Semi-Annual Testing

Test both switch poles at every semi-annual NFPA 17A and NFPA 96 inspection by triggering a simulated system discharge and verifying both switch contacts change state and all connected circuits respond correctly. A switch that fails to actuate is an immediate red-tag deficiency. Replace with a new MS-DPDT OEM unit sourced from authorized buckeye fire distributors and document in the fire suppression system inspection record.

Can I use a generic DPDT microswitch instead of the MS-DPDT?

No. The MS-DPDT is specifically rated and listed for Buckeye fire suppression system actuation forces and operating conditions. Generic dpdt micro switch components may not meet the actuation force, temperature rating, or cycle life requirements for fire suppression applications. Using non-OEM switches voids the system's UL 300 listing. Source only through authorized buckeye fire distributors or buckeye fire equipment co channels.

How does the MS-DPDT differ from the Pyro-Chem 551155 two-switch kit?

Both provide DPDT microswitch functionality for kitchen fire suppression interlock applications, but they are system-specific OEM components — the MS-DPDT is listed for Buckeye systems and the 551155 is listed for Pyro-Chem Kitchen Knight II systems. They are not interchangeable. Always use the switch component specified by the system manufacturer for each installation.