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Snap Action Thermostats to fit any Application

Snap Disc, or snap action thermostats are ideal in a wide variety of applications because they are highly versatile and customizable. Comstat offers the following options for Snap Disc thermostats and related snap switch products:

  • Models with operating temperature ranges from -45C to +425C
  • Models with tight differentials for temperature control
  • Gold contacts for very low current applications
  • Special tolerances depending on need
  • Various mounting and termination options
  • Encapsulated models for protection to IP64
  • Precision and commercial models
  • Hermetic or non-hermetic seals
  • Automatic or manual reset options
  • Honeywell Redi-Temp and Redi-temp compatible models available
Action On Rise: Oper. Temp:  Reset
Product Name  Comstat Part Number  OEM Part Number  Min. Order Qty.  Action on Rise  Oper. Temp  -     
1/2" Snap Disc Thermostat
TK24A1-124
--
5
Open 255 F+/- 7    
1/2" Snap Disc Thermostat
TK24A1-165
--
5
Open 329 F+/- 9    
1/2" Snap Disc Thermostat
TK24A1-225
--
5
Open 437 F+/- 13    
1/2" Snap Disc Thermostat
TK24H2-250
--
5
Open 482 F+/- 27    
1/2" Snap Disc Thermostat
TK24H2-275
--
5
Open 527 F+/- 30    
1/2" Snap Disc Thermostat
TK24H2-300
--
5
Open 572 F+/- 32    
1/2" Snap Disc Thermostat
TK24H2-325
--
5
Open 617 F+/- 36    
1/2" Snap Disc Thermostat
TK24H2-350
--
5
Open 662 F+/- 38    
Close On Rise Snap Disc
TK24A2-35
Stock
5
Close 95F +/- 5    
Close on Rise Snap Disc
TK24A2-43
Stock
5
Close 110F +/-5    
Close on Rise Snap Disc
TK24A2-54
Stock
5
Close 130 F +/- 5    
Close on Rise Snap Disc
TK24A2-66
Stock
5
Close 150F +/- 5    
Close on Rise Snap Disc
TK24A2-77
Stock
5
Close 170F +/-5    
Close on Rise Snap Disc
TK24A2-88
Stock
5
Close 190F +/- 5    
Close on Rise Snap Disc
TK24A2-99
Stock
5
Close 210F +/-5    
1/2" Snap Disc Thermostat
TK24A1-10
--
5
Open 50 F +/- 5    
1/2" Snap Disc Thermostat
TK24A1-18
--
5
Open 65 F+/- 5    
1/2" Snap Disc Thermostat
TK24A1-24
--
5
Open 75 F+/- 5    
1/2" Snap Disc Thermostat
TK24A1-29
--
5
Open 85 F+/- 5    
1/2" Snap Disc Thermostat
TK24A1-35
--
5
Open 95 F+/- 5    
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Many of these snap action thermostat options are available as in stock standard products and are ready to ship. Browse our inventory below or visit our Thermostat Design Configurator to find the right Snap Disc thermostat for your project!

What is a snap switch also known as Snap Disc or snap action thermostat?

Snap Disc, or snap switch thermostats are bimetal mechanical thermostats that function via the thermal expansion and contraction of a bimetal disc that “snaps” from a convex to a concave shape at a set temperature. When the disc “snaps”, it either completes or interrupts a circuit. Snap Disc thermostats have many practical applications. They are used in both heating and cooling applications to ensure the process temperatures do not exceed the thermal limits of the equipment or process. In some cases, Snap Disc thermostats with tight differential models can be used as the primary temperature control device. However, the most common application for a snap switch or snap action thermostat is as an over-temperature protection (or OTP) failsafe.

Because of their small size and low mass, the response time of the snap switch design is extremely rapid compared to other commercially available thermostatic devices. Additionally, the bimetal element of a Snap Disc does not carry the current, but acts as the force to open and close the contacts. Thus snap action thermostats have a long life at relatively high currents – up to 16 amps for the ½ inch series – making snap switches the first choice of many OEMs.

Precision Snap Disc thermostats are found in commercial food equipment, adhesive dispensing devices, laboratory instrumentation, aircrafts, medical equipment, electronic control systems and more. Commercial Snap Disc thermostats are most commonly found in appliances, heat and smoke detectors and HVAC equipment.

Comstat offers the following standard types of these bimetal snap switch thermostats: automatic reset Snap Disc thermostats; manual reset Snap Disc thermostats, and adjustable Snap Disc thermostats. Comstat also offers the widest possible operating temperature ranges for bimetal thermostats, ranging from -45C to +425C.

Want to know more about Comstat’s selection of snap action thermostats? Download Comstat’s Snap Disc Thermostat Primer PDF for more technical and application information, or contact us to speak directly with a member of the highly knowledgeable Comstat team.

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