SSC-25 Soft Start Control Module

Key Features

• ✔️ Compact and User-Friendly: Designed for easy installation and operation.
• ✔️ Adjustable Ramp Speed: Customize the startup sequence with a ramp-up time ranging from 1 to 60 seconds, allowing for gentle acceleration and reduced motor stress.
• ✔️ Adjustable Pedestal: Set the startup voltage between 10% and 50% for specific application needs.
• ✔️ Simple Wiring: Streamline your installation process with straightforward wiring, saving you time and effort during setup.
• ✔️ High Inrush Capability: Delivers robust performance and reliability when handling inrush currents of up to 25A (when mounted on a suitable heatsink).

Product Overview

Enhance the performance and longevity of your electrical equipment with this mains-operated soft-start power module. Designed to deliver smooth and controlled startups, this versatile module offers adjustable ramp-up times ranging from 1 to 60 seconds, allowing you to tailor the acceleration to suit your specific application needs.

Whether powering heat lamps, fans, pumps, or other AC motor loads, the SSC-25 provides reliable performance and protection against transient voltages and sudden power surges. With a built-in 10 – 50% pedestal feature, you can easily adjust the startup voltage set point for optimal operation in various scenarios.

Upgrade your electrical system with this soft starter module for smoother startups, improved performance, and enhanced protection for your valuable equipment.

Applications

Ideal for a diverse range of applications, including:

• Heat Lamps
• Fans
• Pumps
• Other AC Motor Loads

Technical Specifications

Installation and Connections

Dimensions and Fixing

The module has a compact design with specific fixing requirements. Key dimensions include:

• Overall dimensions are approximately 56mm (height) x 43mm (width) x 26mm (depth).
• M5 Power Terminals are located at the top.
• Fixing centres are 48mm apart, with 2 x 4.5mm holes for mounting.
• M3 Input Terminals are located below the power terminals.
• An end view shows the terminal layout.

Wiring and Connections

The module features clearly marked terminals for connection:

• Output Terminals: L (Line) and N (Neutral) for the load.
• Input Terminals: L (Line) and N (Neutral) for the 240V AC input.
• Ramp Speed Adjustment: A control labeled "RAMP SPEED" allows adjustment by turning clockwise.
• Pedestal Adjustment: A control labeled "PEDESTAL" allows adjustment.
• Optional Capacitor: A terminal for an optional capacitor is indicated.
• SCR Fuse: A space for an SCR fuse (not supplied) is shown.

Important Warnings and Requirements

• WARNING LIVE TERMINALS: Ensure mains power is switched OFF before commencing any servicing work.
• EARTHING: The unit must be earthed.
• FIXING REQUIREMENTS: For 25A operation, the unit must be fastened to a heatsink rated at 1.3°C per Watt at an ambient temperature of 35°C. The heatsink must be earthed using a 4mm screw or bolt, ensuring good metal-to-metal contact between the module's base and the heatsink. Heatsink paste is essential for proper thermal transfer.

Thermal Data and Heatsink Selection

The document includes thermal data illustrating the relationship between heatsink thermal resistance and maximum load current. It provides examples of suitable heatsinks for panel mounting, such as:

• 70 x 70 x 3 mm Aluminium with 8°C/W thermal resistance.
• 100 x 100 x 3 mm Aluminium with 4°C/W thermal resistance.
• 170 x 170 x 3 mm Aluminium with 2°C/W thermal resistance.

For operation at 25A, a heatsink with a thermal resistance below 1°C/W will be required (refer to optional extras).

Recommendations

Fusing

It is recommended to use semiconductor (fast acting) type fuses or circuit breakers (Semiconductor - MCB) for unit protection. On initial switch-on, some loads may require an increased Factor of Safety (F of S) for unit and/or device protection. Refer to the SRA datasheet for further information.

Available Documents

Additional documents are available on request, which may be appropriate for your application:

Installation and Maintenance Standards

It is recommended that installation and maintenance of this equipment should be done with reference to the current edition of the I.E.T. regulations (BS7671) by suitably qualified/trained personnel. These regulations contain important requirements regarding the safety of electrical equipment. For International standards, refer to STANDARDS on D of C.

Optional Extras

Product Code and Related Product Code