423880 Ansul Micro Switch 3 Pack

The Ansul 423880 is a field-mountable kit containing three Single-Pole, Double-Throw (SPDT) snap-action micro switches and the mounting hardware needed to install them in the Ansul AUTOMAN Regulated Release Assembly for the R-102 and PIRANHA restaurant fire suppression systems. Each switch is independently wired to a separate electrical circuit, allowing a single mechanical actuation of the fire suppression system to simultaneously trigger up to three distinct electrical responses in the kitchen's utility infrastructure.

When the AUTOMAN actuates -- whether by a fusible link separating or a manual pull station being activated -- the cam mechanism inside the release assembly operates all three switches at once. Each switch has both a Normally Closed (NC) and a Normally Open (NO) contact, giving each circuit the ability to either open (interrupt) or close (complete) upon actuation. This dual-path design makes the 423880 versatile for controlling a range of electrical loads simultaneously with a single fire event.

NC and NO Contact Logic

• Normally Closed (NC): Used for circuits that should break when the system fires: for example, cutting power to electric cooking appliances under the hood.
• Normally Open (NO): Used for circuits that should complete when the system fires: for example, activating a remote alarm, strobe notification appliance, or Building Management System (BMS) input.

Typical Three-Circuit Configuration

• Circuit 1: Appliance Shutdown: Wired through a relay or shunt-trip breaker to interrupt power to the electric cooking appliances under the protected hood.
• Circuit 2: Ventilation Control: Wired to shut down the make-up air (MUA) unit while allowing the exhaust fan to continue removing smoke, or to shut both down depending on the local authority having jurisdiction.
• Circuit 3: Alarm or Monitoring: Wired to a fire alarm control panel, central monitoring station, or BMS to signal system actuation.

Common Failure Modes in Kitchen Environments

• Grease Wicking: Aerosolized kitchen grease can travel down wires and into switch housings over time, creating a sticky internal mechanism that may prevent proper snap action. Annual or semiannual inspection confirms switch response is crisp.
• Vibration Loosening: Heavy exhaust fans create hood vibration. The mounting hardware in the 423880 kit is designed to resist this, but installation screws should be verified tight at each semiannual inspection.
• Contact Arcing: Switching high-inrush motor loads (such as exhaust fans) directly through the switch contacts without an interposing relay can cause contact pitting over time. For motor loads, use a properly rated relay or contactor controlled by the switch contact rather than connecting the motor load directly.

Semiannual Service Requirements

• Dry-Trip Verification: The certified Ansul distributor performs a dry trip (without discharging agent) to verify all three switches actuate simultaneously at the correct moment in the AUTOMAN's cam travel.
• Continuity Testing: A multimeter check verifies that contact resistance is near zero in the closed state. Elevated resistance indicates corrosion or pitting.
• Bracket Alignment: The mounting bracket must be square with the AUTOMAN cam. Misalignment puts lateral load on the switch actuators, accelerating mechanical wear.

• NFPA 96 Requirements: NFPA 96 requires that all fuel and electrical power sources under a protected hood be shut off upon system actuation. The 423880 kit provides the capacity to simultaneously interlock multiple appliance circuits, ventilation controls, and alarm systems as required by the authority having jurisdiction.
• NFPA 17A Requirements: Semiannual inspection must include functional verification of all installed switches per the R-102 or PIRANHA service requirements.
• OEM Parts Requirement: Using non-listed switches in a UL 300 system can void the system's listing and may constitute a code violation. Install only Ansul OEM listed components.
• Certified Installer Required: Installation, wiring, and testing of the 423880 kit must be performed by a certified Ansul R-102 or PIRANHA distributor.

Can I add the 423880 kit to an existing R-102 system that already has one switch?

Yes. The 423880 is a field-mountable kit designed to be added to an existing AUTOMAN regulated release assembly that may currently have fewer switches installed. This is a common upgrade when a kitchen adds electrically-controlled appliances or when code compliance requires additional interlocked circuits. The certified Ansul installer confirms the AUTOMAN configuration and available switch positions before installation.

Is a relay required between these switches and the appliance loads?

For larger electrical loads -- particularly motor-driven equipment such as exhaust fans and make-up air units -- an interposing relay or contactor rated for the motor load should be used rather than connecting the motor directly to the switch contacts. Switching motor loads directly can cause contact arcing and premature wear. Your certified Ansul distributor and the licensed electrician confirm the correct wiring method for each interlocked circuit.

Is this kit compatible with the Ansul PIRANHA system?

Yes. The 423880 Three Switch Kit is compatible with both the R-102 wet chemical system and the PIRANHA restaurant fire suppression system. Confirm with your certified Ansul distributor that the AUTOMAN model in the specific installation accepts the 423880 kit.