Bosch D273, D273IS, D273TH, D273THCS, D273THE Specsheet

Fire Alarm Systems | D273 Photoelectric Smoke and Smoke and Heat Detectors

D273 Photoelectric Smoke and Smoke and
Heat Detectors

www.boschsecurity.com

u 12 VDC or 24 VDC input

u Designed for commercial or residential use

The D273 Family includes the following detector
models:

Model Description

D273 Four-wire

1

D273IS

Four-wire with an isolated 135°F (57°C) heat sensor
and sounder

D273TH Four-wire with 135°F (57°C) heat sensor

D273THC Four-wire with 135°F (57°C) heat sensor and auxiliary

relay

D273THCS

1

Four-wire with 135°F (57°C) heat sensor, auxiliary
relay, and sounder

D273THE Four-wire with 135°F (57°C) heat sensor and EOL

relay

D273THR

2

Four-wire with 135°F (57°C) heat sensor and trouble
relay

D273THS

D273THES

1

Four-wire with 135°F (57°C) heat sensor and sounder

1

Four-wire with 135°F (57°C) heat sensor, sounder,
and EOL relay

u Four-wire application

u Light-emitting diodes (LEDs) indicate the status of

the chamber, power, and alarm

u Removable terminal block to simplify wiring

connections

1

Sounders produce 85 dB at 10 ft (3 m).

2

The trouble relay indicates both Dirty Smoke Chamber and/or
Power Loss conditions.

Each of the detector models is UL Listed and works
with commercial fire protective signaling and
household fire warning systems. Each model detects
smoke particles produced during wood, paper, and
fabric combustion.

System overview

These 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.

2 | D273 Photoelectric Smoke and Smoke and Heat Detectors

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

Functions

Chamber Calibration Tests

Check the sensitivity and calibration of any of these
detectors using a visual check, a magnet test, or a
voltage measurement test. Refer to the D263/D273
Families Installation Guide for specific instructions to
perform these sensitivity tests.

Certifications and approvals

Region Certification

USA UL UROX: Smoke - Automatic Fire Detectors

CSFM see our website

NYC­MEA

MSFM

Hong Kong HKFSD J-005/C/023

(UL268 and A), UROX7: Smoke - Auto­matic Fire Detectors Certified for Cana­da (cULus)

274-93-E, Vol. VII

Installation/configuration notes

Use smoke detectors for detection circuits that
protect people. Use heat detectors for circuits that
protect property.

Compatible Products

The following products are compatible with the D273
Family detectors:

Category Product ID Product Description

Control
Panels

Modules D132B Reversing relay module

These detector models are compatible with UL Listed
four-wire control panels. Refer to the manufacturer’s
installation instructions to select the correct EOL resistor.

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.

Mounting

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.

Wiring

The terminal block accepts up to 12 AWG (ISO

2.5 mm2) wire. You can remove the terminal block
from the detector for easier wiring. The terminal block
snaps in and out of the detector.

Parts included

Quant. Component

1 Detector

1 Literature pack – Installation Manual, Technical Service

Note on installation

Technical specifications

Environmental Considerations

Relative Humidity: Up to 93%, non-condensing

Operating and Storage
Temperature:

Radio Frequency
Interference (RFI)
Immunity

+32°F to +120°F (0°C to +40°C)

No alarm or setup on critical frequencies
in the range of 26 MHz to 950 MHz.

Mechanical Properties

Dimensions (Diameter x H): 5 in. x 2 in. (12.7 cm x 5.1 cm)

Material: High impact, fire retardant ABS

plastic

Power Requirements

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

D273THES: 96 mA maximum

D273IS: 100 mA maximum

Current Draw (standby)

D273, D273TH, D27THC,
D273THCS, D273THS:

D273IS: 15 mA

D273THE, D273THES: 15 mA

D273THR: 18 mA maximum

0.1 mA maximum

Ordering information

D273 Four‑Wire Smoke Detector

Four‑wire smoke detector.

Order number D273

3 | D273 Photoelectric Smoke and Smoke and Heat Detectors

D273IS Four‑Wire Smoke Detector with Isolated Heat
Sensor and Sounder

Four‑wire smoke detector with an isolated 135°F
(57°C) heat sensor and a sounder.

Order number D273IS

D273TH Four‑Wire Smoke/Heat Detector

Four‑wire smoke detector with a 135°F (57°C) heat
sensor.

Order number D273TH

D273THC Four‑Wire Smoke/Heat Detector with Auxili­ary Relay

Four‑wire smoke detector with an isolated 135°F
(57°C) heat sensor and an auxiliary relay.

Order number D273THC

D273THCS Four‑Wire Smoke/Heat Detector with Auxili­ary Relay and Sounder

Four‑wire smoke detector with a 135°F (57°C) heat
sensor, an auxiliary relay, and a sounder.

Order number D273THCS

D273THE Four‑Wire Smoke/Heat Detector with EOL Re­lay

Four‑wire smoke detector with a 135°F (57°C) heat
detector and an EOL relay.

Order number D273THE

TP280 Trim Plate

For retrofit and remodeling purposes; 16.2 cm (6 in.)
diameter

Order number TP280

D273THES Four‑Wire Smoke/Heat Detector with EOL
Relay and Sounder

Four‑wire smoke detector with a 135°F (57°C) heat
sensor, a sounder, and an EOL relay.

Order number D273THES

D273THR Four‑Wire Smoke/Heat Detector with Trouble
Relay

Four‑wire smoke detector with a 135°F (57°C) heat
sensor and a trouble relay.

Order number D273THR

D273THS Four‑Wire Smoke/Heat Detector with Sounder

Four‑wire smoke detector with a 135°F (57°C) heat
sensor and a sounder.

Order number D273THS

Accessories

D275 Power Supervision Module

Line supervision device for four-wire fire detection
circuits

Order number D275

D1005 Test Cable

Connects a digital voltmeter to the detector's
calibration pin for verifying that the detector is within
its calibration range

Order number D1005

DT‑2 Detector Removal Tool

Use the DT‑2 to remove, replace, or test the detector
head

Order number DT-2

4 | D273 Photoelectric Smoke and Smoke and Heat Detectors

Represented by:

Americas: Europe, Middle East, Africa: Asia-Pacific: China: America Latina:

Bosch Security Systems, Inc.
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.us

Bosch Security Systems B.V.
P.O. Box 80002
5617 BA Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: [phone]
[e-mail]
www.boschsecurity.com

Robert Bosch (SEA) Pte Ltd, Security
Systems
11 Bishan Street 21
Singapore 573943
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.asia

Bosch (Shanghai) Security Systems Ltd.
201 Building, No. 333 Fuquan Road
North IBP
Changning District, Shanghai
200335 China
Phone [phone]
Fax: [phone]
www.boschsecurity.com.cn

Robert Bosch Ltda Security Systems Division
Via Anhanguera, Km 98
CEP 13065-900
Campinas, Sao Paulo, Brazil
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

© Bosch Security Systems 2014 | Data subject to change without notice
2700558987 | en, V5, 31. Oct 2014