System Sensor 5624 Dual-Circuit Mechanical Heat Detector, Fixed Temperature 194F

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System Sensor 5624 — dual-circuit mechanical heat detector, fixed temperature only, rated 194 °F (90 °C).A metal contact is held to the chamber by a fusible alloy; at the rated tem perature the alloy melts and the contact closes the circuit. Dual circuit means two separate contact sets, so one detector can sit on the panel initiating circuit and switch an auxiliary device at once, where a single-circuit model does one or the other. Fixed temperature element only; no rate-of-rise and no rate compensation UL protected spacing 25 ft × 25 ft on a 10 ft ceiling; UL 521 Maximum installation temperature 150 °F (65.6 °C) Normally open contacts, 6 to 125 VAC at 3 A and 6 to 28 VDC at 1 A Non-polarized SEMS terminals, 14 to 22 AWG 4.57 in. diameter × 1.69 in. high with bracket, 6 oz. External collector drops on activation to show the operated unit Fixed temperature models are non-resettable and cannot be tested, unlike 5621 and 5622, whose rate-of-rise element self-restores. The 5623 is this same detector at 135 °F; 5603 and 5604 are the single-circuit versions. Show more