SST4-RSW Soft Start Controller

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SST4-RSW 4kW Soft Start Controller with Remote Switch Input

Product Code: SST4-RSW

The SST4-RSW Soft Start Controller is a fully weatherproof solution for controlling up to 4kW of electric heaters (such as infrared quartz halogen).  Designed to augment an existing simple on/off switch the unit will prolong the life of the heating elements through soft-start and soft-stop technology, thus reducing maintenance costs.

The SST4-RSW is operated by connecting any suitable latching action switch (e.g. a conventional light switch**) which delivers greater flexibility in the style and placement of controls.  When turned on, power is gradually applied to the heater over 3 seconds so avoiding large inrush currents and reducing stress to both the heating element and the electrical supply. When the switch is returned to the off position, the heater is turned off in a similar manner.

Designed for safety the remote switch connection terminals are low voltage and isolated from the mains supply.  This ensures that the control switch remains safe for use at all times.

The unit is designed for outdoor installation, rated to IP65 and housed in a robust high-quality polycarbonate enclosure. All connections are made through preinstalled cable glands, and wall mounting is achieved via pre-drilled holes in the enclosure which maintain its ingress protection rating

The SST4-RSW can control a maximum load of 4kW.

Typical applications for the 4kW Soft Start Controller include:

  • Warehouse infrared halogen heaters
  • Workshops
  • Garages and hangers
  • Agriculture and stabling
  • Church heating
  • Pub and beer gardens
  • Restaurants and Hotels
  • Patio and gardens
  • Smoking shelters
  • Outdoor event heaters

* Based on typical usage estimates.

** Not supplied

Download product datasheet (2012Kb)

Product features:

  • 3 year guarantee
  • Energy-saving product
  • IP rated enclosure
  • Money-saving product
  • Selectable timer / timeout
  • Suitable for heating control
  • Suitable for lighting control

£75.00 (ex. VAT)

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manfactured to order - please allow up to 7 working days for delivery

IPTDS2 - IP65 Time Delay Switch 2-Wire

IPTDS2 IP65 Weatherproof Time Delay Switch 2 Wire £39.00

Product Code: IPTDS2

The IP65 Rated Time Delay Switches have been designed to switch external lighting and heating on at the press of a button and automatically off after a pre-determined duration has elapsed. read more

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SST6-RSW 6kW Soft Start Controller with Remote Switch Input £89.25

Product Code: SST6-RSW

The SST6-RSW is a fully weatherproof Soft Start Controller with simple on/off action to control up to 6kW infrared and quartz halogen heating loads while prolonging the life of heating elements.  This unit can be remotely activated by a standard switch to initiate the soft start and will remain active until switched off again which will activate the soft stop.  Ideal for use with permanent infrared and quartz halogen heating in warehouses, factories, garages, etc. read more

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manfactured to order - please allow up to 7 working days for delivery

Power supply

220V – 240V AC 50Hz (live/neutral/earth)

Load capacity

35W – 4,000W (resistive)

Power consumption (control circuit)

<1W (standby), 2W (active)

Internal fuse (for control circuit)

250V F1A (fast blow), 5 x 20mm glass cartridge

Output type

Triac soft-start/stop with relay bypass (switched live, common neutral)

Remote input type

SELV, latching (closed = on)

Cable gland capacity

Supply/load: M20, for 7-13mm dia. round cable
Remote input: M16, for 4-9mm dia. round cable

Operating temperature

-10°C to +40°C

Ingress protection



5 years




160mm x 80mm x 55mm