AVR 25A Enclosed Phase Angle AC Regulator (230V)

The AVR-25A Variable Phase-Angle AC Regulator is a robust, enclosed power controller designed for precise manual adjustment of single-phase AC loads. Rated up to 25A, it supports 230V AC operation and is suitable for industrial heating systems, quartz lamps, ovens, moulding machines, dryers and selected inductive loads.

Featuring a high-current TRIAC, an integrated high-speed fuse arrangement and a built-in heatsink, the AVR-25A is designed to deliver reliable power regulation and manage high inrush currents. Its compact enclosure, single-entry cable gland and supplied control knob and dial make it a practical solution for industrial and commercial installations requiring adjustable AC power.

With support for direct-connected or transformer-coupled loads, the AVR-25A provides a versatile approach to controlling heating equipment and other compatible single-phase applications.

Key Features

• Variable phase-angle control for adjustable AC power output.
• High-current TRIAC designed to handle substantial inrush currents.
• Integrated high-speed fuse arrangement for overcurrent protection.
• Enclosed construction for a compact, integrated controller solution.
• Single-entry cable gland to simplify wiring and installation.
• Suitable for direct or transformer-coupled single-phase loads.
• Designed for industrial and commercial heating and power-control applications.

Technical Specifications

• Controller Type: Enclosed single-phase variable phase-angle regulator
• Maximum RMS Current: 25A
• Mains Voltage: 230V AC ±10%
• Mains Frequency: 50/60Hz
• Minimum Load Current: 200mA
• Manual Control: 220kΩ potentiometer
• Minimum Level Adjustment: 0–50% via cermet adjustment
• Peak One-Cycle Surge Current: 250A
• Heatsink Thermal Resistance: 1.3°C/W
• Maximum Operating Temperature: 65°C
• Replacement Fuse: 30A, 660V, SCR type
• Isolation Classification: Class II, as specified in the supplied data
• Isolation Voltage: 2500V RM
• I²t for SCR Fusing: 250A²s
• Off-State dv/dt: 500V/µs
• Maximum Cable Entry: 2.5mm², as specified in the supplied data
• Storage Temperature: −20°C to +85°C
• Construction: Enclosed unit with integrated heatsink
• Cable Entry: Single-entry cable gland
• Included Accessories: Control knob and dial

Operation

The AVR-25A uses phase-angle control to regulate the AC power delivered to a compatible load. By adjusting the supplied control knob, the user changes the conduction angle of the power semiconductor, varying the effective output supplied to the connected equipment.

This method is particularly useful for applications requiring manual adjustment of heating intensity or power output. The high-current TRIAC is designed to accommodate significant inrush currents, while the integrated heatsink helps dissipate heat generated during operation.

The regulator supports direct-connected loads and transformer-coupled single-phase loads, subject to compatibility with the connected equipment and the manufacturer’s installation requirements.

Applications

The AVR-25A is suitable for a range of industrial and commercial applications, including:

• Industrial ovens and heating systems
• Quartz lamps and infrared heat lamps
• Moulding machines
• Industrial dryers
• Heating elements
• Transformer-coupled loads
• Selected AC motors and inductive loads
• Commercial heating equipment
• Single-phase power-control systems
• Industrial equipment requiring manual AC power regulation

For inductive loads and transformer-coupled applications, confirm load compatibility and inrush-current requirements before installation.

Benefits

• Precise manual adjustment: The control knob and dial allow users to vary the output to suit the application.
• High-current capability: Rated up to 25A RMS for suitable loads.
• Inrush-current handling: The high-current TRIAC is designed to manage substantial starting-current surges.
• Integrated thermal management: The built-in heatsink supports heat dissipation during operation.
• Compact enclosed design: Combines the main control components in a single unit.
• Overcurrent protection: The specified high-speed fuse arrangement helps protect the regulator against excessive current.
• Versatile load control: Suitable for compatible resistive loads and selected inductive or transformer-coupled applications.
• Simplified installation.