Thyristor Heater Control

Our Thyristor heater control solutions are designed and built to your requirements. The panel is designed to control an electric heater, battery single or three phase and a single or 3 phase supply fan. The supply fan has an on/off switch on the panel facia, and individual run and trip indicators, the supply fan also has a two minute run on timer.

The heater is interlocked with the supply fan, and can only be on when the supply fan is running. Airflow switch and heater cut-out contacts are to be wired in the heater circuit to prevent the heater from running when there is no airflow, or the heater has gone over temperature. The temperature is controlled by the digital thermostat on the panel facia, this monitors the supply air via a duct sensor fitted in the duct at least 2M from the heater battery.

The Thyristor heater control panel is designed for wall mounting in a clean, dry environment where the ambient temperature does not exceed 30°C. A space approximately 50mm should be left around the enclosure to allow for heat dissipation.

All wiring must comply with current regulations and be in compliance with the Health and Safety at Work Act.


  • Door interlocking isolator
  • Indication for Panel Live, and individual Run and Trip indicators for the Heater and Supply Fan
  • Thermal overload and MCB protection for the Supply fan
  • Individual On – Off switches for the Heater, and Supply Fan
  • Fire alarm contacts for shutdown in fire situation
  • Digital thermostat on panel facia for Heater control
  • 2 minute Supply Fan run on timer


Loose Supply Items

  • Duct sensor


  • 1 or 3 Phase Supply fan
  • 1 or 3 Phase Electric Heater
  • Heater cut-out and Airflow switch
  • Fire alarm circuit
  • Duct sensor

Required supply: depends on requirements
Supply fan: depends on requirements
Heater battery: depends on requirements

Thyristor Heater Control Enquiries

Have a question about Sarum Thyristor Heater Controls? Please fill out the form below and we will get back to you.