PR3-E-36kW SPM | 50A Three-Phase Burst Fire Controller | 415V

Description

PR3-E-36kW SPM 415V Three Phase Burst Fire Power Controller

The PR3-E-36kW SPM is a high-performance three-phase burst fire power controller engineered for seamless control of resistive loads using advanced two-thirds control technology. Designed for HVAC, industrial heating, and process control applications, it delivers precise power regulation while minimising flicker and eliminating RFI through fast pulse zero-voltage switching.

The SPM (Standard Plus Monitoring) version provides enhanced system protection and diagnostics with integrated SCR and high-speed fuse monitoring, making it ideal for critical heating installations where uptime and reliability are essential.

Featuring automatic thermal protection, integrated semiconductor fuses, flexible control options, and a built-in enable/trip input, the PR3-E-36kW SPM offers a complete solution for high-power heating control applications.

Key Features

• Seamless three-phase control using two-thirds control technology
• Fast pulse zero-voltage switching to reduce flicker and eliminate RFI
• SPM version with integrated SCR and high-speed fuse monitoring
• DC signal or manual potentiometer control
• Automatic reset over-temperature protection
• Integral high-speed semiconductor fuses
• Built-in volt-free enable/trip 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: 36kW (50A)
• 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 fault monitoring (SPM version)
• Volt-free enable/trip input for external safety circuits

Terminal Connections

• Phase power:
  • 10mm² rising clamp terminal block
• Earth:
  • 10mm² rising clamp terminal block
• Remote supply, alarm relay, enable input and control signal:
  • 2.5mm² rising clamp terminal blocks

Torque Settings

• Power terminals:
  • 1.2Nm

Fusing

• 63ET (63A) high-speed semiconductor fuse or equivalent

Environmental

• Ambient operating temperature:
  • Up to 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

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.