Bosch Security MX250

Multiplex Photoelectric Smoke Detector
An open-area multiplex photoelectric smoke detector; requires an MXB2W Smoke Detector Base.

  • Factory New
  • Material Obsolete
Brand: Bosch Security Part #: 50737 Categories: , Manufacturer Part #: MX250


The MX250 Series Photoelectric Smoke and Smoke and Heat Detectors are low profile detectors for the DS7400Xi Series Control Panels and the DS9400 Series Fire Alarm Control Panels (FACPs). The patented chamber design provides superior immunity to false alarms caused by dust. The detector is designed for use with commercial and household fire warning systems. An LED indicator flashes to verify that the detector has power and the smoke sampling circuitry is functioning. The detector will automatically reset after an alarm condition has been cleared.

The detectors work in conjunction with a required base. This provides for ease in replacing the detector head.


Weight 0.50 lbs
Dimensions 4.00 × 4.00 × 1.50 in



Rotary Dials

Material Qualities

Fire Retardant, High Impact Resistance

Detection Method


Production Status



Bosch Security


  • Connects to a two-wire multiplex bus
  • Superior dust immunity
  • Exclusive ChamberCheck self diagnostics
  • Automatic sensitivity test features
  • Easy disassembly for cleaning
  • Equipped with rotary switches for address setting


MX250 Series Multiplex Photoelectric Smoke Detectors
Bosch Security – Data Sheet – 2010
Multiplex Photoelectric Smoke Detectors; MX250 and MX250TH
Bosch Security – Installation Instructions – 2004
Upgrading to FPD-7024 or DS9400M/I
Bosch Security – Technical Bulletin – 2011

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