Series THR and THL

Barksdale_Temp Switch_THR Description
Barksdale's THR and THL Series Temperature Switches add flexibility to Barksdale's solid reputation for quality and reliability and offers versatility for your temperature switching needs. These thermostats are ideal for freeze protection or temperature control in more demanding industrial applications. The THR and THL Series thermostats feature 10 foot stainless steel sensors for remote monitoring and local mount sensors for ambient temperature sensing. The THR and THL Series feature limit switches with 22 amps @ 125/250 VAC and 3 amps @ 480 VAC electrical ratings that allow thermostats to be used for higher current, heat tracing applications. The THR and THL Series models are all UL listed and CSA approved.



  • High accuracy
  • Line or ambient sensing
  • NEMA 4X & IP 65
  • UL, CSA and CE approved


  • Heat tracing
  • Process equipment
  • Machine tools and industrial equipment


Accuracy: ±1% of full scale
SPDT, prewired snap action
22 amp @ 125/250/480 VAC
Electrical Characteristics: All models incorporate Underwriters' Laboratories, Inc. and CSA listed single pole double throw snap-action switching elements. Switches may be wired normally open or normally closed.
Electrical Connection: 3/4" NPT female conduit connection. 3 pole terminal block accepts 14-10 AWG wire.
Electrical Ratings: 22 amps @ 125/250/480 VAC
Enclosure Rating: NEMA 4X
Anodized die cast aluminum
Green polyurethane coated
Other exposed parts: stainless steel
Bulb and Capillary:
Capillary Length:
System Pressure (max):
316L stainless steel
7-3/4" (197mm), 5/16" (8mm) dia.
10' (3m), remote mount
300 psi without thermowell
Silicone oil-filled
UL listed, file 56247
CSA certified, file LR 34555
EMI/RFI: to EN 55011
Temperature Range: 15°F - 325°F (-9°C - 163°C)
Ambient Temperature: See table in Barksdale Data Sheet (media temperature limit)
Adjustment: External adjustment knob. Turn clockwise to decrease setpoint
Vibration: 10 g's 10 - 500 Hz, MIL-STD 202F
Shock: 50 g's, 10 mS, MIL-STD 901C
Standard Options:
R2 (Option):
DPST relay switch
22 amp @120/240/277 VAC
Relay coil: 120 VAC, 4VA
120/240/277 VAC
Relay coil: 240 VAC, 4VA
Weight: 1.9 lbs. (0.9 kg)