Improved Racing Thermal Switch, 1/8" NPT, 10A, 12V

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  • Activate an electric fan or fluid pump automatically when the fluid reaches activation temperature.
  • Rated for up to 10 amps at 12 volts.
  • Common 1/8" NPT thread size.
  • Available in 180°F, 190°F, or 200°F activation temperature.
Part # LTS-XXX

Improved Racing's thermally activated switch will turn on an electric fan or electric differential / transmission pump when fluid reaches the activation temp of 180°F, 190°F, or 200°F. These switches are a great way to control fluid temperatures without using a thermostat.

The switch's body is made from brass, which has a high rate of thermal conductivity for quick reactions to changes in temperature.

The switch features a standard 1/8" NPT thread for screwing into an existing sensor port or a sensor tee. It is rated for up to 10 amps at 12 volts.


  • When the activation temperature is reached at the probe, the switch will complete a circuit between the two spade connectors.
  • When the temperature at the probe drops to the deactivation temperature, the switch will open the circuit between the two spade connectors.

Installation Notes

  • Higher amperage devices (over 10A) require the use of a relay. 
  • Always wire with a 10A fuse to protect the switch from damage when not using a relay.


  • Rating: 10A at 12V
  • Activation temp: 180°F, 190°F, or 200°F available
  • Dectivation temp: 160°F, 170°F, and 180°F
  • Max operating temp: 356°F (180°C) max
  • Operating life: 100,000+ cycles
  • Thread size: 1/8" NPT
  • Body material: Brass
  • Uses common spade connectors


Part Number Activation Temperature Deactivation Temperature
LTS-180 180°F (82.2°C) 160°F (71.1°C)
LTS-190 190°F (87.8°C) 170°F (76.7°C)
LTS-200 200°F (93.3°C) 180°F (82.2°C)


Part #
1/8" NPT
Maximum Operating Temperature
356°F (180°C)
Fluid Compatibility
Air and gas
Engine oil
Ethanol-based fuels (E85+)
Ethanol/gasoline mixtures
Gear oil
Nitrous Oxide
Power Steering Fluid
Racing fuels
Transmission fluid
Improved Racing
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