HNC-310 non-addressable heat detectors are suitable for connection to 2-wire non-addressable fire detection control and indicating equipment, or to addressable fire detection control and indicating equipment that can accept non-addressable type detectors. An electronic thermistor provides sensitive rate-of-rise operation or fixed-temperature operation when the response threshold value is exceeded. Durable heat sensor Analogue detection discrimination Dual LEDs for 360° visibility 2-wire and 4-wire models for DC 12 V and DC 24 V operation Dual LEDs for 360° visibility 4-wire models available with a N/O alarm relay output 4-wire models available with auto-reset 2-wire models available with remote LED output Connects to zone monitor for use with addressable control and indicating equipment