Description

PR3-E-30kW SPM 415V Three Phase Burst Fire Power Controller

The PR3-E-30kW SPM is a high-performance three-phase burst fire power controller designed for seamless control of resistive loads using advanced two-thirds control technology. Developed for demanding HVAC and industrial heating applications, it delivers precise power regulation while minimising flicker and eliminating RFI through fast pulse zero-voltage switching.

The SPM (Standard Plus Monitoring) version enhances operational reliability with integrated SCR and fuse monitoring, providing advanced diagnostics and fault indication for critical heating systems. With built-in semiconductor fuses, automatic thermal protection, and flexible control options, the PR3-E-30kW SPM is ideal for installations where uptime and safety are essential.

Key Features

• Seamless three-phase control using two-thirds control technology
• Fast pulse zero-voltage switching to minimise flicker and eliminate RFI
• SPM monitoring version with SCR and high-speed fuse monitoring
• DC signal or manual potentiometer control
• Automatic reset over-temperature protection
• Integrated high-speed semiconductor fuses
• Built-in volt-free trip/enable input for external thermal protection circuits
• Power, status, and fault LED indicators
• Easy access signal and power terminals for straightforward installation
• Suitable for floating-star and closed-delta resistive load configurations

Technical Specifications

Electrical

• Power rating: 30kW (42A)
• Supply voltage: 415V RMS nominal
• Input voltage: 400V RMS ±10%
• Frequency: 50/60Hz

Control Input Options

• 0–5V DC
• 1–5V DC
• 0–10V DC
• 2–10V DC
• 0–20mA
• 4–20mA
• Manual control via 5kΩ potentiometer

Alarm & Monitoring

• Alarm relay contact rating:
  • 2A @ 125V AC
• Power LED indicates controller power status
• Status LED tracks output activity and burst firing operation
• Fault LED provides diagnostic indication

Protection Features

• Over-temperature trip activates at:
  • 90°C ±1°C
• Automatic reset temperature:
  • 85°C ±1°C
• Phase loss detection
• Sensor loss detection
• SCR and fuse monitoring (SPM version)
• Volt-free enable/trip input for external safety circuits

Terminal Connections

• Phase power:
  • 10mm² rising clamp terminals
• Earth:
  • 10mm² rising clamp terminal
• Alarm relay, enable input, remote supply and control signal:
  • 2.5mm² rising clamp terminals

Torque Settings

• Power terminals:
  • 1.2Nm

Fusing

• 30kW model:
  • 56ET (56A) high-speed semiconductor fuse or equivalent

Environmental

• Ambient temperature:
  • 45°C without derating

Mechanical

• Dimensions:
  • 152mm (D) × 241mm (W) × 115mm (H)
• Fixing centres:
  • 220mm (W) × 130mm (D)
  • 4 × 5.5mm mounting holes
• Weight:
  • 2.6kg

Applications

The PR3-E-30kW SPM is suitable for 3-wire, three-phase floating-star or closed-delta configured resistive loads, including:

• HVAC air curtain systems
• Industrial furnaces
• Ovens
• Dryers
• Hot plates
• Process heating equipment
• Commercial heating systems
• Industrial temperature control applications

The PR3-E Series SPM models are the ideal solution for managing high-power HVAC systems and other industrial heating applications, ensuring reliability, efficiency, and safety.