Ansul Microswitch, SPDT - 423878
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Wholesale PricingThe Ansul Microswitch, SPDT (P/N 423878) is a snap-action electric switch used with the AUTOMAN release mechanism in an Ansul R-102 Restaurant Fire Suppression System. When the release mechanism actuates, this switch trips and sends a signal to the building's fire alarm panel, letting the alarm system register that the kitchen suppression system has discharged. The switch kit ships with the mounting components and instructions needed for a technician to install it on the release mechanism enclosure.
Because this switch is the link between a mechanical fire suppression actuation and the building's electrical alarm and monitoring systems, its proper function is part of what a technician verifies during scheduled testing. With the AUTOMAN mechanism in the cocked, ready position, pressing the switch lever by hand should produce an audible click, confirming the switch is making contact correctly before relying on it to report an actual discharge event.
| Feature | Details |
|---|---|
| Manufacturer | Ansul (A Johnson Controls Brand) |
| Part Number | 423878 |
| Component Type | SPDT Snap-Action Microswitch |
| Electrical Rating | 50 mA, 28 VDC |
| System Compatibility | Ansul AUTOMAN Release Mechanism, R-102 System |
| Function | Signals Fire Alarm Panel on System Actuation |
Kitchen suppression systems are pre-engineered systems under NFPA 17A, and installing or replacing this microswitch must be performed by an Ansul certified distributor, since correct wiring to the building fire alarm panel is part of the overall fire alarm system's certified design.
- Semiannual Professional Service: A qualified technician tests the switch by pressing its lever with the AUTOMAN mechanism in the cocked, ready position and confirming an audible click, verifying the switch makes contact correctly.
- Alarm Panel Coordination: Any replacement or rewiring of this switch should be coordinated with the fire alarm system's service provider to confirm the signal is still correctly received and logged at the panel.
- Post-Discharge Check: After any actual system actuation, confirm the switch correctly signaled the fire alarm panel as part of the post-discharge inspection and recertification process.
What does SPDT mean and why does it matter here?
SPDT stands for single pole, double throw, meaning the switch has one common terminal that can connect to either of two other terminals depending on its position. This allows the switch to be wired for both normally open and normally closed circuit configurations, giving flexibility in how it integrates with different fire alarm panel designs.
Does this switch shut off gas or electrical equipment directly?
No. This microswitch is specifically for signaling the fire alarm panel that the suppression system has actuated. Gas shutoff on actuation is handled by separate mechanical or electric gas valves elsewhere in the system, not by this alarm signaling switch.
Can I test this switch myself between scheduled service visits?
Routine functional testing of this switch should be performed by a certified technician as part of scheduled service, since it involves working directly on the release mechanism and verifying the alarm panel correctly receives the signal, which is outside the scope of a basic visual inspection.
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