Description

PR3-E-12kW 415V Three Phase Burst Fire Power Controller

The PR3-E-12kW is a compact and reliable three-phase burst fire power controller designed for seamless control of resistive heating loads using advanced two-thirds control technology. Engineered for HVAC, industrial heating, and process temperature control applications, it delivers precise power regulation while minimising mains flicker and eliminating radio frequency interference (RFI) through fast pulse zero-voltage switching.

The controller supports both DC signal and manual potentiometer control, offering flexibility for integration into a wide range of heating systems. Integrated semiconductor fuse protection, automatic over-temperature monitoring, phase loss detection, and diagnostic LED indicators provide dependable operation and enhanced system protection.

Designed for easy installation and long-term reliability, the PR3-E-12kW is an ideal solution for air curtains, ovens, dryers, furnaces, and other three-phase resistive heating applications.

Key Features

• Seamless three-phase control using two-thirds control technology
• Fast pulse zero-voltage switching
• Minimises flicker and eliminates RFI
• DC signal or manual potentiometer control
• Automatic reset over-temperature protection
• Integral high-speed semiconductor fuse protection
• Phase loss detection
• Sensor loss detection
• LED status indication tracking output level
• Alarm relay output
• Easy-access power and control terminals
• Suitable for floating-star and closed-delta resistive loads
• Compact and robust industrial design

Technical Specifications

Electrical

Power rating: 12kW (17A)

Supply voltage: 415V RMS nominal

Input voltage: 400V RMS ±10%

Frequency: 50/60Hz

Control Input Options

Voltage Signal Input

• 0–10V DC (factory setting)
• 0–5V DC

Current Signal Input

• 4–20mA
• SW3 set to “I” (ON)
• SW4 set to 0–5V mode

Manual Control

• 5kΩ potentiometer

Alarm & Monitoring

Alarm Relay

Relay contact rating:

• 2A @ 125V AC maximum

Status LED

• LED intensity changes according to output level and control signal

Protection Features

Over-Temperature Protection

Trip temperature:

• 90°C ±1°C

LED indication:

• Continuous fast flashing

Phase Loss Detection

LED indication:

• Continuous slow flashing

Sensor Loss Detection

LED indication:

• Fast ON/OFF flashing

Terminal Connections

Phase Power and Earth

• 10mm² rising clamp terminal block

Auxiliary Alarm Relay

• 2.5mm² rising clamp terminal block

Remote Supply

• 2.5mm² rising clamp terminal block

Control Signal

• 2.5mm² rising clamp terminal block

Torque Settings

Power Terminals

• 1.2Nm

Fusing

Recommended Fuse

• 20A high-speed semiconductor ferrule fuse
• 10mm Ø × 38mm

Environmental

Maximum ambient operating temperature:

• 40°C

Mechanical

Dimensions:

150mm (D) × 240mm (W) × 100mm (H)

Fixing centres:

• 220mm (W) × 130mm (D)
• 4 × 5.5mm mounting holes

Weight:

• 2.6kg

Applications

Suitable for 3-wire, three-phase floating-star and closed-delta configured resistive loads, including:

• HVAC air curtain systems
• Industrial furnaces
• Industrial ovens
• Dryers
• Hot plates
• Process heating systems
• Commercial heating equipment
• Temperature control systems
• Manufacturing heating processes
• Industrial thermal management applications

The PR3-E Series provides a reliable and efficient solution for controlling three-phase electric heating loads, offering easy installation and robust performance tailored for industrial HVAC applications.