Amerex Alarm Initiating Snap Action Switch (MRM & PRM) 18312 - OEM

The Amerex 18312 is the OEM alarm initiating snap action switch for Amerex KP kitchen fire suppression systems using MRM (Manual Release Module) and PRM (Pneumatic Release Module) control heads. Based on the product title and the standard function of alarm initiating switches in Amerex KP systems: when the system fires, this snap action switch trips and sends an electrical signal to a connected fire alarm panel or auxiliary device — providing notification that the kitchen suppression system has activated. This is the electrical link that connects suppression system activation to the building's broader fire alarm infrastructure.

Alarm initiating switches in commercial kitchen fire suppression systems are required by NFPA 96 in most installations where the suppression system must interface with a building fire alarm panel. The snap action mechanism provides a fast, positive switch actuation. This is an OEM Amerex part built specifically for the MRM and PRM release module configurations in the Amerex KP system. Consult the Amerex KP system documentation and your fire alarm system contractor to confirm the correct wiring configuration for your specific installation.

Test the 18312 at every semi-annual NFPA 17A and NFPA 96 inspection to confirm the switch fires and sends the correct signal when the system activates. Available through authorized Amerex distributors. Document switch testing and any replacement in the fire suppression system inspection record.

At every semi-annual NFPA 17A and NFPA 96 inspection, the technician will trigger a simulated discharge and verify the 18312 snap action switch fires and the connected fire alarm panel receives and displays the correct input signal. If the fire alarm panel doesn't register the signal during testing or if the switch itself fails to actuate, the system fails the alarm interface portion of the inspection. The switch must be replaced and the alarm interface re-tested before the inspection can be signed off. Document switch test results and any replacement in the fire suppression system inspection record.

My kitchen suppression system fired but the fire alarm panel didn't show it. Could this be the switch?

Yes, a failed or disconnected 18312 alarm initiating switch is one of the most common reasons a kitchen suppression discharge doesn't register on the fire alarm panel. Other causes include wiring issues between the switch and the panel, or a disconnected or faulty fire alarm panel input circuit. Your fire suppression service technician should check the switch and wiring during the post-discharge service visit. This is also something that should have been caught at the most recent semi-annual inspection if the switch was properly tested.

Is the 18312 compatible with all fire alarm panel brands?

The 18312 is a dry contact switch. It provides a contact closure that can be wired into virtually any fire alarm panel's zone input. The switch itself is compatible with any fire alarm system that accepts a dry contact alarm initiating input. Your fire alarm system contractor or the fire alarm panel manufacturer can confirm the correct wiring and input configuration for your specific panel.