MI-MM3E stand alone micro modules provide a two-wire initiating circuit for normally open contact fire alarm and supervisory devices. The circuit may be monitored for open-circuit and short-circuit wiring faults. An LED indicator output drive is provided to allow visual monitoring of the module's operating condition. The MI-MM3E is small enough to fit inside a single gang junction box behind the device being monitored. Its size and light weight allows it to be installed without the need to be rigidly mounted (see figure 1) however it is recommended that the screw fixing positions be used if possible, particularly in larger enclosures or where the installation is expected to be subject to vibration or movement.

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Size 48mm (l) x 40mm (w) x 13mm (h) (excluding screw fixings and cables) Weight 33g Operating Temperature Range -10°C to 60°C Note: Do not install in locations where the normal ambient temperature range extends beyond 0° to 50°C for extended periods Operating Humidity Range 10% to 93% Relative Humidity, Non-condensing Com. Line Supply Range 15 to 32 VDC Max. Standby Current 300μA @ 24 VDC (no communication) Max. Standby Current 375μA @ 24 VDC (communication once every 5 secs) Supervisory Loop Current 100μA (normal) Supervisory Loop Current (min) 150μA (short) Initiating Circuit Line Requirements: Maximum Resistance 20 ohms