Description

PR3-E-54kW High-Power Three-Phase Thyristor Controller

The PR3-E-54kW Thyristor Power Controller is a high-capacity solution engineered for precise control of three-phase resistive loads in demanding industrial and HVAC applications. Utilising a two-thirds control technique and fast pulse zero-voltage switching, it ensures smooth power delivery while minimising flicker and eliminating RFI.

Designed for higher power requirements, the 54kW model features forced-air cooling, making it ideal for continuous operation under heavy loads. With DC signal control, robust protection features, and flexible installation, the PR3-E-54kW delivers reliable and efficient performance in critical heating environments.

Key Features

High Power Three-Phase Control
Designed for 54kW (75A) resistive loads at 415V.

Zero Voltage Switching Technology
Reduces electrical noise, eliminates RFI, and minimises flicker.

Burst Fire Control Modes

• Slow burst (1-second proportional cycle)

• Fast burst (variable, non-proportional control)

Flexible Control Options

• 0–10V DC (standard)

• 0–5V DC

• 4–20mA (with configuration)

• Manual control via 5kΩ potentiometer

Forced-Air Cooling System
Integrated fan cooling ensures reliable operation at high power levels.

Comprehensive Protection

• Automatic over-temperature trip with reset

• Integral high-speed semiconductor fuses

• Phase loss detection

• Sensor loss detection

Alarm Relay & Status Monitoring
Configurable alarm relay and LED status indication for diagnostics.

Robust Industrial Construction
Durable design with integrated heatsink and secure terminal connections.

Benefits

• Reliable control of high-power three-phase heating systems

• Reduced flicker and electrical interference

• Enhanced system safety with built-in protections

• Suitable for continuous industrial operation

• Flexible integration with control systems

Applications

The PR3-E-54kW is ideal for high-power resistive heating applications, including:

• HVAC systems and air curtains

• Industrial furnaces and ovens

• Dryers and process heating systems

• Hot plates and thermal processing equipment

Compatible with 3-wire, 3-phase floating-star or closed-delta configurations.

Technical Specifications

Power Ratings

• Power Output: 54kW (75A) @ 415V RMS nominal

• Available Range: 36kW (50A), 54kW (75A)

Electrical

• Input Voltage: 400V RMS ±10%

• Frequency: 50/60Hz

Control Inputs

• 0–10V DC (standard)

• 0–5V DC

• 4–20mA (with 270Ω resistor configuration)

• Manual via 5kΩ potentiometer

Control Modes

• Slow Burst: 1-second proportional cycle

• Fast Burst: variable, non-proportional

Protection & Monitoring

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

• Trip reset temperature: 85°C ±1°C

• Phase loss detection

• Sensor loss detection

• Alarm relay: 2A @ 125V AC max (configurable NO/NC)

Cooling

• Forced-air cooling with 24V AC fan

• Fan activation temperature: ~55°C

Indicators

• LED status indicator (tracks control signal intensity)

• Fault indication via flashing patterns

Connections

• Power terminals: 16mm² rising clamp

• Control & auxiliary: 2.5mm² rising clamp

• Terminal torque: 2.5Nm (power terminals)

Fusing

• 100A high-speed semiconductor fuse (54kW model)

Environmental

• Maximum operating temperature: 65°C

Mechanical

• Dimensions: 250mm (D) x 155mm (W) x 120mm (H)

• Fixing centres: 140mm (W) x 150mm (D)

• Weight: 3.5kg