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How to Use a Microswitch to Control a Fire Suppression System

Jill Kokemuller

When installing a new hood and exhaust system in a kitchen, or retrofitting an existing system, a fire suppression system must be put in place. There is always a risk of fire in a kitchen where heating elements are used. When a fire occurs, the suppression system detects the fire and sends a signal to microswitches to cut off the power to the heating elements and the air intake while leaving the exhaust running to help eliminate smoke and fumes.

Step 1

Use a magnetic or electronic starter motor relay box when using microswitches to control the shutdown of electric systems. Individual appliances have a higher amp rating than the amp rating of a microswitch. Relaying the appliances through a starter box allows the amperage to be adjusted for the switches.

Step 2

Connect the designated on/off control terminals on the starter motor box to the normally closed (NC) terminals of the microswitch using a low-voltage cable. Strip the end of the cable and screw the wire in place on the microswitch terminal. Two microswitches are installed in the box, additional switches are stackable and can be added without additional mounting tools.

Step 3

Reset the microswitch panel after a fire. When a fire is detected and the normally closed microswitch opens, shutting down the power, the power does not come back on until it is manually reset.