Bosch D253 is a two-wire 24 VDC heat detector base

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Item code: D253
Availability: Yes

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    The D253 is a two-wire 24 VDC heat detector base with a latching steady-on alarm LED. It accepts Bosch D254 and D255 heat detector heads.

    D253 Two-wire Detector Base (24 VDC)

    • 24 VDC, two-wire circuit compatibility

    • Latching LED

    • Low-profile six-inch diameter base accepts interchangeable detector heads

    • Easy head removal for cleaning and servicing

    • Standard screw terminal connectionsCertifications and Approvals

    Listings and Approvals UL UROX: Smoke Automatic Fire Detectors (UL268)
     CSFM 7300-1615: 115
     Factory Mutual Research
     NYC/MEA (284-91-E, Vol. II)

    Installation/Configuration Notes
    Compatible Products
    The following products are compatible with the D253 two-wire Detector Base:

    CategoryProduct IDProduct Description
    Control PanelsD7022Conventional FACP
    D7024Conventional FACP
    D7024Addressable FACP
    D7212Addressable control panel
    D7212GAddressable control panel
    D7412GAddressable control panel
    D9112Addressable control panel
    D9412GAddressable control panel
    D9124Addressable FACP
    Detector HeadsD254AFixed temperature heat detector (+135F [+57C])
    D255Fixed temperature heat detector (+190F [+88C])

     * The D253 requires use of a D125B Powered Loop Interface Module and a separate UL Listed 24 VDC power supply. Use a D130 Relay Module to reset the 24 VDC detectors with a Reset Sensor command from the control panel.
    Note Bosch makes no claims either written, oral, or implied that the D253 works with any control panel other than those listed above.

    The D253 base fits on standard three-inch octagonal and four‑inch square and octagonal back boxes.

    Refer to the installation instructions (P/N: 42885) for detailed wiring requirements.

    Parts Included

    1 D253 detector base
    1Hardware pack
    1Literature pack

    Technical Specifications

    Environmental Considerations
    Temperature (operating)+32F to +100F (0C to +38C)
    Mechanical Properties
    ColorBone white
    Dimensions (diameter)6 in. (15.2 cm)
    Power Requirements
    Current (alarm)38 mA
    Current (operating) 0.055 mA
    Voltage (operating) 15.0 VDC to 36.3 VDC

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