Siemens DT-135F


Thermal Fire Detector, Fixed Temperature, 135°F

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Brand: Siemens Part #: 40255 Categories: , Manufacturer Part #: DT-135FSecondary Part #: 500-019616


The Siemens Building Technologies ─ Fire Safety Division Thermal Fire Detectors are fixed temperature or a combination of fixed-temperature / rate-of-rise type. The combination detectors consist of two, independently operated thermal elements. The rate-of-rise element is self-restoring. However, the fixed temperature is of the non-restoring type.

Underwriter’s Laboratories, Inc., recommends the combination-type thermal detector be used to protect a maximum of 2,500 square feet (50-foot spacing), and the fixed-temperature type be used to protect a maximum of 625 square feet (25-foot spacing). However, job conditions and engineering judgment often dictate closer spacing to provide faster detection.


Weight 1.00 lbs



Detectable Medium

Detection Method

Thermal Rating

Production Status


Product Notes

Replacement: 5603

Thermal Fire Detectors; Models DT-135R, DT-135F, DT-200R and DT-200F


Siemens - Data Sheet