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Remote bulb thermostats regulate temperature of air or liquids in ducts, pipes, tanks and boilers.


  • Suitable for applications requiring temperature control of air or liquids where controller must be placed outside the sensing area.
  • Typical uses include control of dampers and valves in heating, cooling and heating-cooling systems.
  • Fast response models (available for use in return air duct) operate approximately four times faster than standard models.
  • Controller can be mounted in any position.
  • Ambient temperature compensation provides good temperature control.
  • Refer to T775 Electronic Remote Temperature Controller where more exact control is required and/or remote controller location is preferred.
  • T675A models with fixed differential have an electrical rating of 125 VA at 120/208/240 and 277 Vac.
  • T675B models have 125 VA pilot duty up to 277 Vac.
  • T678 models have a maximum connected load of 2000 VA.

Product Specifications

Hazmat Information
UN 1993, FLAMMABLE LIQUID, N.O.S. (contains Isopropanol), 3, III
Control of dampers and valves in heating, cooling or heating-cooling systems
Dimensions (in.)
5 5/8 in. high x 2 in. wide x 2 5/8 in. deep
Dimensions (mm)
143 mm high x 51 mm wide x 67 mm deep
Celsius model
Item Type
50 Hz; 60 Hz
Approvals, Underwriters Laboratories Inc.
UL Listed: E4436, Vol. 4, Sec. 11, Guide XAPX
Approvals, Canadian Standards Association
CSA Listed: Report -1
Contact Ratings
120 Vac-- 8.0 AFL, 48.0 ALR. 125 VA Pilot Duty; 240 Vac-- 5.1 AFL, 30.6 ALR, 125 VA Pilot Duty; 277 Vac-- 4.2 AFL, 25.2 ALR, 125 VA Pilot Duty
120 Vac or 240/277 Vac
Setpoint Temperature Range (C)
-15 C to +35 C
Operating Temperature Range (F)
125 F Maximum
Operating Temperature Range (C)
52 C Maximum
Relay Outputs
Sensor Inputs
Sensor Element
Copper bulb
Capillary Length (ft)
5 ft
Capillary Length (m)
1.5 m
Bulb Size (in.)
1/2 in. x 4 3/16 in.
Bulb Size (mm)
13 mm dia. x 106 mm long
Differential Temperature (F)
3 F to 10 F
Differential Temperature (C)
1.7 C to 5.6 C
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