PR3-E-6kW | 8A Three-Phase Burst Fire Power Controller | 415V

Description

PR3-E-6kW 8A Three-Phase Burst Fire Power Controller

The PR3-E Series of thyristor stacks provides seamless control of three-phase resistive loads using a two-thirds control technique. Control is achieved via a DC signal or manual control using a 5kΩ potentiometer. These burst firing control stacks utilise fast pulse zero-volt switching technology to minimise flicker and eliminate RFI problems. The controller also features an auto-reset temperature trip, integral semiconductor fuses, and a heatsink. Designed for natural air cooling, the PR3-E Series offers easy access to signal and power terminals for simple installation.

A compact thyristor stack engineered for precise, seamless control of three-phase resistive loads using a two-thirds control technique. The PR3-E uses fast pulse zero-voltage switching to minimise flicker and eliminate RFI, making it ideal for sensitive industrial heating environments. With integral semiconductor fuses, auto-reset thermal protection, and simple terminal access, it’s designed for reliable performance and easy installation.

Key Features

• Seamless control of three-phase resistive loads (two-thirds control method)
• Fast pulse zero-voltage switching to reduce flicker and remove RFI
• DC signal control or manual control via 5kΩ potentiometer
• Auto-reset over-temperature trip for added safety
• Integral high-speed semiconductor fuses
• Naturally air-cooled with integrated heatsink
• Easy access to signal and power terminals
• Compact, panel-friendly design
• Alarm relay output and LED diagnostic indication
• Phase loss and sensor loss detection

Technical Specifications

• Power rating: 6kW (8A) controlling 2 phases of a typical 415V supply
• Input voltage: 400V RMS ±10%
• Frequency: 50/60Hz

Control inputs

• 0–10V DC (standard) or 0–5V DC (SW3 selectable)
• Manual control via 5kΩ potentiometer
• 4–20mA supported (SW I/V ON + 270Ω resistor across SIG+/-, SW3 to 0–5V)

Protection & diagnostics

• Auto-reset over-temperature trip at 90°C ±1°C
• Reset temperature 85°C ±1°C
• Phase loss detection (LED slow pulse)
• Sensor loss detection (LED fast pulse)
• LED intensity tracks control signal
• Alarm relay: 2A @ 125V AC
• SW1 selectable relay behaviour (NO/NC in fault)

Terminations

• Phase power: 10mm² rising clamp
• Earth: 10mm² rising clamp
• Control signal: 2.5mm² rising clamp
• Auxiliary alarm: 2.5mm² rising clamp
• Terminal torque (power): 1.2Nm

Fusing

• 16A high-speed semiconductor ferrule fuse (6×32mm)

Environmental & mechanical

• Max ambient: 65°C
• Dimensions: 105mm (D) × 193mm (W) × 68mm (H)
• Fixing centres: 178mm horizontal, 2 × 5mm Ø
• Weight: 770g

Applications

Suitable for 3-wire, 3-phase floating-star or closed-delta resistive loads:

• HVAC systems and air curtains
• Furnaces
• Ovens
• Dryers
• hot plates