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Safety strap-on thermostats STB and STW Honeywell FEMA

The STW Series and STB Series of universal strap-on thermostats produced by Honeywell / FEMA are designed for floor heating applications. They are suitable for use as strap-on, wall-mounted, or (with...

The STW Series and STB Series of universal strap-on thermostats produced by Honeywell / FEMA are designed for floor heating applications. They are suitable for use as strap-on, wall-mounted, or (with optional immersion well) immersion thermostats.


Product comparison
Type adjustable range reset
STW 70130 / STW 70130F 70 … 130 °C auto
STW 2080 / STW 2080F 20 … 80 °C auto
STB 70130 / STB 70130F 70 … 130 °C manual
STB 2080 / STB 2080F 20 … 80 °C manual

Devices of the STW Honeywell / FEMA Series measure temperature. If the sensor temperature exceeds the set value, a snap-action switch opens, interrupting the electrical circuit. As soon the sensor temperature drops by more than 10 K, the snap-action switch again closes automatically. (Also, if the sensor tem-perature drops to below approx. -20 °C, the snap-action switch opens, but closes again automatically after the tem-perature rises again.)
Devices of the STB Honeywell / FEMA Series likewise measure temperature. If the sensor temperature exceeds the set value, a snap-action switch opens, interrupting the electrical circuit, and remains open until reset manually. (Also, if the sensor temperature drops to below approx. -20 °C, the snap-action switch opens, but closes again automatically after the temperature rises again.) To manually reset the device, the sensor temperature must drop by more than approx. 10 K.

Parameter Value
Max. switching capacity 230 Vac, 16 A (2.5 A)
Min. switching capacity 24 Vac/dc, 100 mA
Humidity 0...95% rh, non-condensing
Storage / operating temperature -30 ... +50 C
Overload temperature 10 K above max. adjustable
temperature
Length of capillary 2 m
Min. bend radius of capillary 5 mm
Pipe diameter 15…100 mm
Mounting position NL 0 / 90 as per DIN 16257
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