Description

PR3-DIN-18kW 415V Three Phase DIN Rail Burst Fire Power Controller

The PR3-DIN-18kW is a compact three-phase burst fire power controller designed for seamless control of electric heating loads in industrial and commercial applications. Engineered for easy integration with Building Management Systems (BMS) and other control systems, it utilises advanced zero-voltage switching technology to minimise Radio Frequency Interference (RFI) while providing reliable and efficient power control.

Designed for DIN rail mounting, the PR3-DIN-18kW offers a space-saving solution for control panels and electrical enclosures. It features automatic over-temperature protection with reset functionality, alarm output monitoring, LED status indication, and robust semiconductor fuse protection. The controller is ideal for electric heating coils, heating cables, furnaces, and other resistive heating applications.

Key Features

• Seamless three-phase burst fire control for electric heating loads
• Two-thirds control technique for efficient power regulation
• Zero-voltage switching technology minimises RFI issues
• DIN rail mounting for fast and simple installation
• Compatible with Building Management Systems (BMS)
• 0–10V DC signal control input
• Automatic reset over-temperature protection
• Integrated alarm output for fault monitoring
• LED output status indicators (T1 and T3)
• No additional heatsink required
• Compact enclosure for control panel integration
• Suitable for industrial heating applications

Technical Specifications

Electrical

• Power rating: 18kW (25A)
• Supply voltage: 415V RMS nominal
• Input voltage range: 24V to 440V AC RMS, three-phase
• Frequency: 50/60Hz

Control Input

• Input signal: 0–10V DC
• Remote power supply:
  • 24V AC or DC ±10%
  • 40mA required
  • External supply required (not included)

Alarm Output

• 24V AC or DC alarm output
• Normally present during healthy operation
• Drops to 0V during:
  • Over-temperature condition
  • Power supply failure

Status Indicators

• T1 and T3 LED indicators display output ratio and operating status

Protection Features

• Automatic over-temperature protection
• Trip temperature:
  • 90°C ±5°C
• Reset temperature:
  • 85°C ±5°C
• High-speed semiconductor fuse protection

Terminal Connections

• Input signal, alarm and 24V supply:
  • 2.5mm² rising clamp terminal blocks
• Power connections:
  • 6mm² rising clamp terminal blocks

Torque Settings

• Power terminals:
  • 0.8Nm

Fusing

• 30A (32ET) High-Speed Semiconductor Fuse or equivalent MCB

Environmental

• Maximum ambient operating temperature:
  • 40°C

Mechanical

• Dimensions:
  • 217mm (W) × 87mm (H) × 110mm (D)
• DIN rail mounting:
  • TS35 DIN rail
• Weight:
  • 0.95kg

Applications

Suitable for controlling three-phase resistive heating loads, including:

• Electric heating coils
• Heating cables
• Industrial furnaces
• Process heating systems
• HVAC electric heating systems
• Air handling unit heaters
• Commercial heating equipment
• Industrial ovens and dryers
• Building Management System (BMS) controlled heating 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.