Description

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

The PR3-E-36kW is a high-performance three-phase burst fire power controller designed to provide seamless control of resistive heating loads using advanced two-thirds control technology. Engineered for HVAC, industrial heating, and process control applications, it delivers accurate and efficient power regulation through fast pulse zero-voltage switching, minimising flicker while eliminating Radio Frequency Interference (RFI).

Built with integral high-speed semiconductor fuses, automatic thermal protection, and comprehensive fault monitoring, the PR3-E-36kW offers reliable operation in demanding industrial environments. Its compact design, flexible control options, and accessible terminal layout make installation and commissioning straightforward.

Ideal for air curtain heaters, industrial ovens, furnaces, dryers, and other three-phase resistive heating systems, the PR3-E-36kW delivers dependable performance and long service life.

Key Features

• Seamless three-phase control using two-thirds control technology
• Fast pulse zero-voltage switching to reduce flicker and eliminate RFI
• DC signal or manual potentiometer control
• Slow and fast burst firing modes
• Automatic reset over-temperature protection
• Integral high-speed semiconductor fuses
• Built-in alarm relay output
• Phase loss and sensor loss detection
• LED indication for power output and fault status
• Easy-access signal and power terminals
• 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

Voltage Signal

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

Current Signal

• 4–20mA
• Requires:
  • SW I/V set to ON
  • 270Ω (¼W) resistor across signal terminals
  • SW3 set to 0–5V

Manual Control

• 5kΩ potentiometer

Burst Fire Modes

• Slow burst:
  • 1 second proportional time base
• Fast burst:
  • Variable, non-proportional burst firing

Alarm & Monitoring

Alarm Relay

• Voltage-free relay contacts
• Contact rating:
  • 2A @ 125V AC

Alarm Relay Modes

• SW1 OFF:
  • Relay normally energised (normally closed)
  • Trips under fault condition
• SW1 ON:
  • Relay normally de-energised (normally open)
  • Closes during fault condition

LED Indicators

• Output/status LED tracks control signal intensity
• Fault indication via flashing LED patterns

Protection Features

• Automatic over-temperature protection
• Trip temperature:
  • 90°C ±1°C
• Automatic reset:
  • 85°C ±1°C
• Phase loss detection
• Temperature sensor loss detection
• Integral high-speed semiconductor fuse protection

Terminal Connections

Power

• Phase power:
  • 10mm² rising clamp terminal block
• Earth:
  • 10mm² rising clamp terminal block

Control & 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:
  • 2Nm

Fusing

• 63ET (63A) High-Speed Semiconductor Fuse or equivalent

Environmental

• Maximum operating temperature:
  • 65°C

Mechanical

Dimensions

• 200mm (D) × 155mm (W) × 120mm (H)

Mounting

• 4 × 4.5mm keyhole fixing slots
• Fixing centres:
  • 140mm (W) × 150mm (D)

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
• Industrial ovens
• Dryers
• Hot plates
• Process heating equipment
• Commercial heating systems
• Industrial electric heaters
• Temperature-controlled manufacturing processes