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