M00063271
New product
UL 521 Heat Detectors for Fire Protective Signaling Systems
standard by Underwriters Laboratories, 02/19/1999
Heat detectors covered by these requirements employ either normally open contacts or normally closed contacts, provide an electronic signal, or consist of a heat-sensitive cable. The requirements do not cover heat detectors for journal-alarm or unit-alarm devices.
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Availability date: 03/28/2022