Fan Speed Controller Range – SP, SPTK & SPM Controllers

Reliable Control Solutions for Single- and Three-Phase Ventilation Systems

The Fan Speed Controller Range provides a comprehensive solution for accurate airflow control, energy efficiency, and system protection across a wide variety of HVAC applications. Including electronic (SP & SPTK) and auto-transformer (SPM) options, this range ensures the right level of control for both simple and advanced ventilation systems.

Product Range Overview

SP Controllers – Electronic Speed Control

The SP series delivers infinitely variable speed control for single-phase fans, making it ideal for straightforward installations.

Key Features:

• Stepless variable speed control (MIN/MAX adjustable)
• Integrated ON/OFF switch with neon indicator
• Compact design for flush or surface mounting
• No separate starter required with compatible fans 

✅ Ideal for: General ventilation systems requiring simple, flexible control

SPTK Controllers – Electronic Control with Protection

The SPTK range builds on the SP series by adding motor protection and enhanced safety features.

Key Features:

• Infinitely variable speed control
• Built-in HOT SPOT motor protection compatibility
• Trip indication and manual reset function
• ON/OFF/RESET switch with fault indication
• No external starter required when used with protected motors 

✅ Ideal for: Systems requiring motor protection and fault monitoring

SPM Controllers – Auto-Transformer Speed Control

The SPM range uses auto-transformer technology to provide robust, stepped speed control with reduced noise.

Key Features:

• 5-step speed selection for controlled airflow
• Low motor noise – eliminates magnetic hum
• Built-in ON/OFF switch
• Suitable for heavier-duty applications
• Optional damper and auxiliary connections 

✅ Ideal for: Commercial and industrial applications where quiet, stable operation is critical

Extended Control Options

RTRE (Enhanced Auto-Transformer Controllers)

• 5-step control with remote switching capability
• Integrated BMS compatibility
• Connection for anti-freeze thermostats
• Suitable for advanced system integration 

RDTK (Three-Phase Controllers)

• Designed for three-phase fan systems
• 5-step transformer control
• Supports high-load industrial applications
• Equipped for remote and system integration 

Key Benefits Across the Range

🎛️ Precise Airflow Control

• From stepless adjustment (SP/SPTK) to multi-step control (SPM)
• Enables accurate system balancing and performance tuning

⚡ Energy Efficiency

• Optimises fan speed to match demand
• Reduces unnecessary energy consumption

🔇 Low Noise Operation

• Auto-transformer controllers minimise motor hum and vibration
• Ideal for noise-sensitive environments 

🛡 Enhanced Safety & Protection

• SPTK models provide motor protection and fault indication
• Supports HOT SPOT protected motors
• Prevents overheating and system damage 

🔧 Flexible Installation

• Compact designs for surface or flush mounting
• Wide range of sizes and load capacities (up to 14A models)
• Easy integration into new or existing systems 

Comparison Overview

Applications

• HVAC and ducted systems
• Commercial ventilation
• Industrial air handling systems
• Plant rooms and extraction systems
• Warehouses and large air movement installations