Transformer fan speed controllers

Transformer fan speed controllers are a reliable, simple and robust solution to control the rotational speed of AC voltage controllable motors.


Reliable, simple and robust

Our transformer fan speed controllers are equipped with auto transformers. They are designed to control the speed of single or three phase voltage controllable fans in different steps.

The controllers up to 7,5 A are available in plastic enclosure, the models above 7,5 A are available in a metal enclosure. Both versions are suited for surface mounting.


The technology

Thanks to the technology used, transformer fan speed controllers provide a regulated output voltage towards the motor with a perfect sinusoidal shape.

This means that there is no risk for EMC pollution and that expensive EMC filters are not required. The motor noise will be reduced to a minimum.

Transformer fan speed controllers are cost efficient and have proven to be very reliable and robust. They can also be used in circumstances with unstable power supply.

Product overview

Single phase 230 VAC power supply:

see product details

RTR-1

Manual 5-step speed control

Max. motor current [A]

7,5 A

Thermal contact input for motor overheating protection

Remote control possibility

Extra features

‘External switch
(SMTL1-30-4C) is required’

see product details

STR-1

Manual 5-step speed control

Max. motor current [A]

20,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

see product details

SER-1

Manual 5-step speed control

Max. motor current [A]

13,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Smoke evacuation button

see product details

GTT-1

Manual 5-step speed control

Max. motor current [A]

12,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Integrated PT500 temperature sensor

see product details

STRS1

Manual 5-step speed control

Max. motor current [A]

20,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

see product details

STRA1

Manual 5-step speed control

Max. motor current [A]

20,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Automatic restart after power failure

see product details

SFPR1

Manual 5-step speed control

Max. motor current [A]

13,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Extra input for (gas) flow detection

see product details

STVS1

Manual 5-step speed control

Max. motor current [A]

13,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Analogue input for 5-step speed control

see product details

SC2-1

Manual 5-step speed control

Max. motor current [A]

13,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Day / night regime

see product details

SC2A1

Manual 5-step speed control

Max. motor current [A]

13,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Day / night regime

see product details

ST2R1

Manual 5-step speed control

Max. motor current [A]

13,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Day / week calendar function

Three phase 230 VAC power supply:

see product details

STR-3

Manual 5-step speed control

Max. motor current [A]

7,5 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Three phase 400 VAC power supply:

see product details

STR-4

Manual 5-step speed control

Max. motor current [A]

14,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

see product details

STRS4

Manual 5-step speed control

Max. motor current [A]

14,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

see product details

STRA4

Manual 5-step speed control

Max. motor current [A]

14,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Automatic restart after power failure

see product details

SFPR4

Manual 5-step speed control

Max. motor current [A]

8,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Extra input for (gas) flow detection

see product details

STTA4

Manual 5-step speed control

Max. motor current [A]

14,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Integrated thermo-magnetic breaker

see product details

STVS4

Manual 5-step speed control

Max. motor current [A]

10,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Analogue input for 5-step speed control

see product details

SC2A4

Manual 5-step speed control

Max. motor current [A]

11,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Day / night regime

see product details

ST2R4

Manual 5-step speed control

Max. motor current [A]

10,0 A

Thermal contact input for motor overheating protection

Remote control possibility via digital input(s)

Extra features

Day / week calendar function

Application example


The key features

  • Simple and reliable
  • AC Fan speed control in steps
  • Minimal motor noise
  • No EMC pollution