Edwards 281B-PL 135F Fixed Temperature Heat Detector Features: UL listed for 50 ft. (15.2m) spacing Single pole normally open contact Low profile with mounting plate Pure white finish Mounting flexibility with screw terminals Easy twist-on installation On-site testing of rate-of-rise feature Positive operating indication for fixed temperature element Agency Listings UL, FM, CSFM The EDWARDS-SIGNALING-281B-PL is a combination fixed temperature/rate-of-rise detector. The heat detector is available with a white plastic reversible mounting plate which can be used for flush or surface mounting. The 281B-PL's rate-of-rise operates with an increase at the sensor of 15F (9C) or more per minute. This closes the contacts in the sensor to transmit the alarm condition to the fire alarm control panel. When the rate-of-rise element alone has been activated, the sensor is self-restoring. The fixed temperature feature of the 281B-PL has a rated temperature of 135F, which when activated, closes contacts in the sensor and transmits an alarm condition to the fire alarm control panel. Technical Specifications: UL Temperature Rating: 135F (57C) UL Max Ambient Temp. at Ceiling: 100F (38C) Rate-of-rise: 15 F (9 C), self restoring UL Recommended Coverage: 2,500 ft. (232 m) UL Recommended Spacing: 50 ft. (15.2 m) FM Recommended Spacing: 30 ft. (9.14 m) UL Maximum Distance from Wall: 25 ft. (7.6m) from any wall or projection extending down from the ceiling more than 12 inches (305 mm) Contacts Rating: Single Pole Normally Open 3.0 amps at 6 to 125 Vac; 1.0 amp at 6 to 24 Vdc; 0.3 amps at 125 Vdc; 0.1 amps at 250 VDC Evironment: Indoors and Dry