Five step Transformer speed controller for speed controlling of 1 ph. Alternating current fans.

Suitable for power control of all speed controllable 1 ph. Alternating fans.

Four secondary voltages stepped in 80÷120÷140÷170 and 230 V (full mains voltage)
Allow to control 5 fan speeds.

A number of different fans can be connected to one controller up to its nominal load.

Available in
3 – 5 — 7.5 – 10 – 11 – 14 amps

Advantages

Good cost effectiveness
Reliable
Low loss and low noise fan operation
TSW Models with full power output for connection with the signal lamp or shutter.

Design for surface mounting units

Robust ISO casing, light grey, made of impact resistant polymer. Protection to IP 54
Built-in operating switch for five speed steps and on/​off function.
Operation display via control lamp
Fully impregnated transformers T 40 E.
Conforms to DIN VDE 0550.
Max. Permitted ambient temperature +40 °C
Delivered ready for installation, simple connection to terminal block.

Design for built-in transformers

Built-up terminal block for five voltage outputs.
Attached fixing brackets for simple fixture
Fully impregnated transformers T 40 E.

The Helios TSW Transformer fan speed controller range can be used with any manufacturers fans / motors which are single phase and suitable for speed control including

• Vent Axia
• Ziehl Abegg
• Elta
• Helios
• Solar and Palau
• Nuaire

Not sure if your fan is suitable? just ask and we can check for you

What is the TSW-MCB transformer speed controller?

The TSW-MCB Transformer Speed Controller is a stepped voltage controller designed to regulate the speed of compatible AC ventilation fans, providing reliable and energy-efficient airflow control.

What types of fans can the TSW-MCB control?

It is suitable for many single-phase ventilation fans, extractor fans and inline duct fans, making it ideal for commercial and industrial HVAC systems.

What are the benefits of transformer fan speed control?

Transformer controllers provide smooth, reliable speed adjustment with reduced motor noise and improved efficiency, helping extend fan lifespan and optimise energy use.

What does MCB protection mean?

The integrated MCB (Miniature Circuit Breaker) helps protect the fan and controller from overloads and electrical faults, improving system safety and reliability.

Where is the TSW-MCB speed controller typically used?

This controller is commonly installed in plant rooms, warehouses, retail units, offices and industrial ventilation systems where manual fan speed adjustment is required.

Can the controller help reduce energy consumption?

Yes. By lowering fan speed when full airflow is not needed, the controller can reduce running costs, noise levels and overall energy usage.

Is the TSW-MCB suitable for wall or panel mounting?

Yes. The unit is typically designed for surface or panel mounting, allowing flexible installation within electrical or HVAC control setups.

Should the controller be professionally installed?

Yes. For safety and compliance with electrical regulations, the TSW-MCB transformer controller should be installed by a qualified electrician.

How does the TSW-MCB compare to electronic fan speed controllers?

Compared with electronic voltage fan controllers, the TSW-MCB typically offers:

• Much quieter operation at low speeds

• Improved motor lifespan and reduced electrical noise

• Higher suitability for large duct fans and HVAC systems

Electronic controllers are usually:

• Lower cost

• Smaller and easier to install

• Suitable for light-duty ventilation applications

How does it compare to smaller transformer controllers?

Compared with lower-amp transformer speed controllers, the TSW-MCB provides:

• Higher current capacity for multiple or larger fans

• Integrated protection features such as MCB or motor protection connections

• More robust construction for continuous commercial use

Smaller transformer controllers are typically:

• More compact

• Cheaper

• Better suited to single small extract fans

How does it compare to inverter fan control?

Compared with variable frequency drives (VFDs) or inverter control systems, the TSW-MCB offers:

• Simpler installation and operation

• Lower overall system cost

• Reliable fixed-speed control without programming

Inverter control systems are generally preferred for:

• Precise airflow modulation

• Energy-optimised building management systems

• Large or complex HVAC installations

The TSW-MCB transformer fan speed controller is a heavy-duty multi-step controller designed for reliable speed control of single-phase ventilation fans in commercial and industrial HVAC systems.

What fans are compatible with the TSW-MCB?

This controller is typically suitable for:

• Inline centrifugal fans

• Cased axial and plate axial fans

• Mixed-flow ventilation fans

• Box fans and roof extract fans

• Commercial kitchen extract fans

It is designed for voltage-controllable single-phase AC motors, allowing stable and quiet speed regulation. 

What electrical requirements are needed?

Compatible fan motors should be:

• Single-phase 230 V AC

• Designed for transformer (step) speed control

• Within the controller’s current rating (various amp sizes available)

• Suitable for 2‑wire or 3‑wire control connections

Can multiple fans be connected?

Yes — several fans can be controlled from one TSW-MCB unit provided the total load does not exceed the rated capacity.

What fan brands are typically compatible?

Transformer controllers in the TSW range are commonly used with fans from manufacturers such as:

• Vent-Axia

• Ziehl-Abegg

• Elta

• Helios

• Soler & Palau

• Nuaire

Where is the TSW-MCB normally used?

The controller is widely installed in:

• Commercial kitchens and catering ventilation

• Warehouses and workshops

• Office and retail HVAC systems

• Industrial extract and supply air systems

This makes it a quiet, robust speed control solution for medium-to-large ventilation installations.

350mm High x 250mm Wide x 150mm Deep