Digital Thermatic^® Fan Switch with 1/4" NPT Sensor & 35mm Inline Adapter Kit (Part #0435)

Our very own Digital Thermatic^® / Electric Fan Switch is designed to manage your Electric Fans or Electric Water Pump (EWP^®).

This kit includes two thermal sensors offering numerous installation options for coolant temperature sensing whilst the inline adapter allows easy fitting directly into the radiator hose. Just screw the ¼ NPT sensor directly into the inline adapter and remove about 17mm (2/3”) of radiator hose, fit the inline adaptor between each hose and secure the hose clamps.

• Temperature Probe: It senses air temperature as it passes through the radiator with the sensor placed in the radiator fin section.

• ¼ NPT Thermal Sensor: Just screw the ¼ NPT sensor directly into the inline adapter or it can be placed into the thermostat housing, engine block, or directly into the radiator.

The switch can run 1 or 2 fans and be used for 12 or 24 volt applications. It has an adjustable temperature range of 40ºC to 110ºC (104ºF to 230ºF) which can show Centigrade or Fahrenheit.

• Fan #1 will start once the temperature reaches the set temperature.
• Fan #2 (if applicable) will start operation 10 seconds after fan #1 starts. 
  The fan/s will operate until the temperature falls by 5°C below the set temperature.

24 Volt Application

Kit sold in 12-volt configuration, for 24-volt application, you will need to purchase 2 x 24-volt relays.

Simply search for part 10534 in our search bar

Sensor Wire length:

• 142cm in total (Wire from switch 112cm plus sensor connector 30cm)
• Post 15-Dec-2021 = 320cm total (Wire from switch 290cm plus sensor connector 30cm)

*The sensor wire has been increased to 320cm from the 15-Dec-2021, batch date 2021

IP66 Rated:

• Protected from total dust ingress
• Protected from high pressure water jets from any direction, limited ingress protection
• Not waterproof

Integrated electrical noise filter for improved compatibility and reliability in older vehicles that produce high levels of electrical interference and noise.

The Inline Sensor Adapter simply fits into your engine’s top radiator hose. The adaptor ends for hose fitting are 35mm in size.

• With the use of our 3mm adaptor sleeve (Included in kit), this can be increased to 41mm (Part #18510)
• With the use of our 6mm adaptor sleeve (Optional), this can be increased to 47mm (Part #18511)

Two 1/4" NPT holes allow the fitment of a sensor and or air bleed. Should you only need one hole, a bung is included.

Convenient push-button settings allow you to quickly set the temperature you wish the Thermatic Fans to be activated. 

• The Digital Thermatic Fan Switch is supplied with connectors and everything you need for a convenient and simple install.
• Automatically activates the Thermatic^® Fans at the set/targeted temperature when extra engine cooling is required
• Can also be installed to activate an Electric Water Pump and Electric Booster Pump

The Digital Thermatic Twin Fan Switch should be mounted in the engine bay close to the radiator.     

*Note: if using this switch for use with and Electric Water Pump (EWP), it will not vary the speed of the pump in response to engine temperature but rather turn the pump on and off at your set temperature. For EWP control, we recommend the Digital Controller (Part 8002) which can manage both the EWP and your Thermatic Fans.