Bosch D273THE Four Wire Smoke Detector with Heat and EOL Relay







Four-Wire with 135°F (57°C) Heat Sensor EOL Relay
Replacement for DS284THE
Special Order


The D273 Series Detector models use 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 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 detector signals an alarm condition. After the alarm condition clears, interrupt power at the control panel to reset the detector.

When a D132B Reversing Relay Module is used, the LED does not latch on alarm.

The terminal block accepts up to 12 AWG (2.3 mm) wire. You can remove the terminal block from the detector for easier wiring. The terminal block snaps in and out of the detector.

Loop Supervision
For loop supervision, install a Bosch Security Systems D275 Power Supervision Module and an EOL resistor after the last device on the loop.

The detector has a mounting plate that attaches to a standard four-inch back box.
For commercial and industrial installations in accordance with NFPA 72, space each detector 30 ft (9.2 m) apart.

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

Current Draw (alarm) at 30 VDC
D273, D273TH: 18 mA maximum
D273THC: 33 mA maximum
D273THE, D273THR: 36 mA maximum
D273THS: 78 mA maximum
D273THCS: 90 mA maximum
D273ES, D273THES, D273THSR: 96 mA maximum
D273IS: 100 mA maximum

Current Draw (standby)
D273, D273TH, D27THC, D273THCS, D273THS: 0.1 mA maximum
D273IS: 0.14 mA maximum
D273ES, D273THE, D273THES,D273THSR:  15 mA
D273THR: 18 mA maximum

  • Model: Bosch D273THE
  • 0 Units in Stock
  • Manufactured by: Bosch

Ask a Question


Add to Cart:
Your IP Address is:
Copyright © 2024 Powered by Zen Cart
Parse Time: n/a - Number of Queries: 91 - Query Time: 0