The System Sensor M500CH is a control module used in fire alarm systems

  

The M500CH can switch discrete contacts to activate or deactivate devices based on commands from a control panel. It supervises connected loads and reports their status to the control panel. The module has fault-tolerant wiring options and a latching LED indicator. It features rotary address switches and two modes of switching operation, controlling either an external power source or a Form C SPDT set of contacts.

It is designed for use with compatible control panels and mounts in a 4 square electrical box with a minimum depth of 2-1/8 inches.