Bosch D250A User Manual
Fire Alarm Systems | D250A Two‑wire Detector Base (12/24 VDC)
D250A Two‑wire Detector Base
(12/24 VDC)
www.boschsecurity.com
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12 VDC or 24 VDC operation
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Two‑wire circuit compatibility
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Can be used in circuit controlled by D291M
addressable base
addressable base
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Low‑profile six‑inch diameter base accepts
interchangeable detector heads
interchangeable detector heads
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Easy head removal for cleaning and servicing
The D250A is a two‑wire, 12 VDC or 24 VDC detector
base without an alarm LED. It accepts Bosch D254 and
D255 heat detector heads. Use the detector base with
either of these heat detector heads in circuits where
specifications call for fixed‑temperature heat
detectors. You can also use this detector base with the
Bosch D256A Rate‑of‑Rise and Fixed‑temperature
(+135°F [+57°C]) Heat Detector and D257A
Rate‑of‑Rise and Fixed‑temperature (+190°F [+88°C])
Heat Detector.
The detector base also operates in a circuit controlled
by the Bosch D291M Addressable Smoke Detector. In
this circuit configuration, the D291M Addressable
Detector Base controls a supervised 24 VDC circuit
containing up to 19 detector bases that accept any
D291M listed head. In this case, the detector base is
not limited to heat detection heads.
base without an alarm LED. It accepts Bosch D254 and
D255 heat detector heads. Use the detector base with
either of these heat detector heads in circuits where
specifications call for fixed‑temperature heat
detectors. You can also use this detector base with the
Bosch D256A Rate‑of‑Rise and Fixed‑temperature
(+135°F [+57°C]) Heat Detector and D257A
Rate‑of‑Rise and Fixed‑temperature (+190°F [+88°C])
Heat Detector.
The detector base also operates in a circuit controlled
by the Bosch D291M Addressable Smoke Detector. In
this circuit configuration, the D291M Addressable
Detector Base controls a supervised 24 VDC circuit
containing up to 19 detector bases that accept any
D291M listed head. In this case, the detector base is
not limited to heat detection heads.
Notice
For more information on using the detector base
with the D291M, see the D291M Installation
Instructions.
For more information on using the detector base
with the D291M, see the D291M Installation
Instructions.
Certifications and approvals
Region
Certification
USA
UL
UROX: Smoke - Automatic Fire Detectors
(ANSI\UL 268)
CSFM
see our website
Installation/configuration notes
Compatible Products
The following products are compatible with the D250A
Two‑wire or Four‑wire Detector Base:
Two‑wire or Four‑wire Detector Base:
Category
Product ID
Product Description
Control
Panels
D7022
Conventional FACP
D7024
Conventional FACP
D7024
Addressable FACP
D7212
Addressable control panel
D7212G
Addressable control panel
D7412G
Addressable control panel
D9112
Addressable control panel