Bosch D273THR Four-Wire Smoke Detector with a 135F Heat Sensor, Trouble Relay

The Bosch D273THR four-wire photoelectric smoke detector uses an infrared (IR) LED light source and a silicon photodiode to measure light in a chamber. A fine screen covers the chamber to deter insects and to reduce dust accumulation and nuisance alarms.

During a fire, smoke particles reflect light onto the photodiode. When the photodiode measurements exceed the alarm threshold, the D273THR signals an alarm condition. After the alarm condition clears, interrupt power at the control panel to reset the detector.

The D273THR is equipped with a 135F (57C) heat sensor and a trouble relay.

UPC: 782695023181
Also known as: DS-D273THR, BOS-D273THR

Technical Specifications: Current Draw: Alarm 36 mA maximum @ 30 VDC, Standby 18 mA maximum Power-up Time: 22 sec maximum Voltage (stand-by): 10 VDC to 30 VDC RMS Ripple: 25% of DC input maximum Material: High impact, fire retardant ABS plastic Dimensions (Diameter x H): 5 in. x 2 in. (12.7 cm x 5.1 cm)

For more information about the Bosch Security D273THR, please contact us.