Description

PR3-E-18kW Three-Phase Thyristor Power Controller

The PR3-E-18kW Thyristor Power Controller is a high-performance solution designed for precise control of three-phase resistive loads. Using an advanced two-thirds control technique and fast pulse zero-voltage switching, it delivers smooth, efficient power regulation while significantly reducing flicker and eliminating RFI issues.

Engineered for demanding industrial environments, the PR3-E Series supports both DC signal control and manual operation via a 5kΩ potentiometer, offering flexibility across a wide range of applications. Built-in protection features—including automatic temperature trip and integral semiconductor fuses—ensure safe, reliable operation.

With robust construction, integrated heatsinking, and easy-access terminals, the PR3-E-18kW is ideal for HVAC systems and industrial heating applications requiring stable and efficient three-phase power control.

Key Features

Seamless Three-Phase Control
Optimised for smooth and stable control of resistive loads.

Fast Zero Voltage Switching
Minimises electrical noise, reduces flicker, and eliminates RFI.

Flexible Control Options
Supports:

• 0–10V DC (standard)

• 0–5V DC

• 4–20mA

• Manual control via 5kΩ potentiometer.

Integrated Safety Protection
Includes automatic resetting over-temperature trip and semiconductor fuses.

Status LED Indicator
Provides visual feedback on operating status, faults, and control signal tracking.

Robust Industrial Design
Includes integrated heatsink and durable construction for long-term reliability.

Easy Installation
Accessible terminals simplify wiring and setup.

Benefits

• Precise and stable three-phase power control

• Reduced flicker and electrical interference

• Enhanced equipment protection and safety

• Flexible integration into existing control systems

• Reliable performance in harsh industrial environments

Applications

The PR3-E-18kW is ideal for three-phase resistive load control, including:

• HVAC systems and air curtains

• Industrial furnaces and ovens

• Dryers and heating systems

• Hot plates and process heating equipment

• Commercial and industrial heating applications

Suitable for 3-wire, 3-phase floating-star or closed-delta configurations.

Technical Specifications

Power Ratings

• Power Output: 18kW (25A) @ 415V RMS nominal

• Available Range: 12kW (17A), 18kW (25A), 27kW (38A)

Electrical

• Input Voltage: 400V RMS ±10%

• Frequency: 50/60Hz

Control Inputs

• 0–10V DC (default)

• 0–5V DC

• 4–20mA

• Manual via 5kΩ potentiometer

Protection & Monitoring

• Over-temperature trip: 90°C ±1°C (auto reset)

• Phase loss detection

• Sensor loss detection

• Alarm relay: 2A @ 125V AC max

Indicators

• LED status indicator (intensity tracks control signal)

• Fault indication via flashing patterns

Cooling

• Natural cooling (18kW model)

• Forced-air cooling (27kW model only)

Connections

• Power terminals: 10mm² rising clamp

• Control & auxiliary: 2.5mm² rising clamp

• Terminal torque: 1.2Nm (power terminals)

Fusing

• 18kW Model: 30A high-speed semiconductor fuse (10mm x 38mm)

Environmental

• Max ambient temperature: 40°C

Mechanical

• Dimensions: 150mm (D) x 240mm (W) x 100mm (H)

• Fixing centres: 220mm (W) x 130mm (D)

• Weight: 2.6kg