423881 Ansul Micro Switch 4 Pack

The Ansul 423881 is a 4-pack of micro switches for expanded auxiliary control in ANSUL suppression systems. These micro switches are used to trigger multiple devices — such as cooking appliance shutdown, exhaust fan control, alarm panels, or other auxiliary interlocks — during ANSUL system activation. The 4-pack format provides enough switches for multi-device interlock installations or high-volume service operations where having spares on hand avoids return visits.

Per NFPA 96, kitchen fire suppression systems must automatically shut off fuel and electric power to protected cooking equipment when the system discharges. The ANSUL micro switches serve this auxiliary interlock function in the ANSUL R-102 and compatible systems — when the system activates, the Ansul automan or control head trips the micro switch contacts, cutting power to appliances and activating alarms simultaneously. The ansul microswitch wiring diagram provided in the ANSUL system manual shows the correct wiring configuration for each interlock function.

The 423881 4-pack is the correct quantity for installations requiring multiple switch functions or for stocking spares alongside the Ansul R-102 service kit. The ansul system pull station, detection network, and micro switch wiring all work together as an integrated system — any failed micro switch contact is an NFPA 96 deficiency that prevents the system from shutting off cooking equipment during a real fire event. Semi-annual testing per NFPA 17A must verify all micro switch functions, with failed switches replaced from the 423881 pack before the system is returned to service.

Wiring Configuration

Wire each micro switch per the ansul microswitch wiring diagram in the ANSUL R-102 system manual. The micro switch cover protects the switch contacts from grease contamination — always reinstall the micro switch cover after wiring to prevent contact fouling. Verify correct actuation force and contact state with the ANSUL control head before commissioning. Document all switch wiring assignments in the system installation record for reference during future service visits.

Semi-Annual Testing

Test all micro switch functions at every semi-annual NFPA 17A and NFPA 96 inspection. Trigger a simulated system discharge and verify each switch contact changes state correctly and all connected auxiliary circuits respond as designed. Replace failed switches with new units from the 423881 pack and retest before signing off the inspection record. A failed switch is an immediate red-tag deficiency under NFPA 96 auxiliary interlock requirements.

What is the difference between microswitch SPDT and micro switch DPDT configurations?

The microswitch spdt (single-pole double-throw) controls one circuit with normally-open and normally-closed positions. The micro switch dpdt (double-pole double-throw) controls two independent circuits simultaneously from one actuation. The 423881 pack specification — verify in the ANSUL R-102 system documentation — determines which configuration is correct for your system's interlock requirements. Use the switch type specified in the ansul microswitch wiring diagram for your specific installation.

Can these switches be used in Pyro-Chem or Buckeye systems?

The 423881 is listed for ANSUL suppression systems. While micro switch mechanisms are similar across brands, the actuation force, mounting geometry, and UL listing are system-specific. For Pyro-Chem systems use the 551155 two switch kit, and for Buckeye systems use the MS-DPDT. Always match switch hardware to the system manufacturer.