EVR-4kW PA Phase-Angle Fan Speed Controller

The EVR-4kW PA from United Automation is a compact phase-angle power controller designed for smooth, proportional control of single-phase 230V loads. Housed in a robust metal enclosure, this unit is widely used as a fan speed controller for HVAC and ventilation systems, while also supporting precise control of heaters and other process loads.

Part of the EVR “Mini Stack” series, it integrates a high-speed semiconductor fuse, convection-cooled heatsink, adjustable soft-start, and multiple control signal options for reliable operation in demanding industrial environments.

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Key Features

• Phase-angle control for smooth proportional voltage and current regulation
• Designed for fan speed control, HVAC, and motor-driven applications
• Wide control signal compatibility: manual, voltage, or current input
• Adjustable soft-start (0–20 seconds) to protect loads and extend lifespan
• Integrated SCR-type high-speed semiconductor fuse (Triac protection)
• Convection air-cooled heatsink for silent, reliable cooling
• Compact, enclosed metal design for easy installation
• Full isolation and overvoltage protection
• Available in enclosure, DIN-rail, or back-plate formats across the EVR range

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Technical Specifications (EVR-4kW)

• Current rating: 17A
• Mains voltage: 230V AC +10% / −6%
• Control signal span (min): 0–5V DC
• Control signal span (max): 0–25V DC
• Control signal zero offset: 0–30% of span
• Signal input resistance: 5kΩ ±20%
• Manual potentiometer options: 2kΩ, 5kΩ, or 10kΩ
• Soft-start time constant: 0–20 seconds adjustable
• Isolation voltage: 2500V RMS
• Auxiliary control output: 5V DC
• Triac limiting RMS current: 26A
• Peak single-cycle surge current: 250A
• Maximum peak voltage: 600V
• Maximum working temperature: up to 65°C

Fuse (EVR-4kW)

• 20A, 660–690V AC, 10×38mm
• GRB / Protistor high-speed semiconductor fuse (gR curve)

Storage temperature

• 0°C to +85°C

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Mechanical Details (Metal Enclosure Version)

• SKU: A72260 (Fan Speed Controller)
• Dimensions (D × W × H): 150 × 90 × 90 mm
• Fixing centres: 135mm (D) × 108mm (W)
• 4 × 5mm mounting holes

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Applications

Suitable for proportional power control in:

• Ventilation and HVAC fan systems
• Motor-driven fans and air handling units
• Industrial and process heaters
• Ovens, dryers, and furnaces
• Air curtains and hot plates
• Electroplating and chemical process control
• Transformer regulation and controlled rectifiers

 

The EVR-4kW PA is especially effective as a simple, energy-efficient fan speed controller for mains-driven motors requiring reliable and adjustable airflow control.