PR1-E-6kW | 25A Enclosed Single-Phase Thyristor Stack | 230V

Description

The PR1-E-6kW from United Automation is a compact, enclosed thyristor stack designed for precise control of single-phase resistive loads using DC signal control.

Using fast pulse zero-volt burst firing, the PR1 range minimises flicker and eliminates RFI issues, making it ideal for heating and HVAC applications. With integral semiconductor fuses, heatsink, and automatic over-temperature protection, this unit delivers reliable, low-maintenance performance with straightforward installation.

Key Features

• Full DC signal control for single-phase resistive loads
• Fast pulse zero-volt burst firing reduces flicker and eliminates RFI
• Automatic reset over-temperature protection
• Integral semiconductor fuse and heatsink in an enclosed design
• Available across PR1 range: 1.5kW, 3kW, and 6kW variants
• Easy access to power and control terminals
• Robust thermal management for long service life

Technical Specifications

• Power rating: 6.0kW (25A) @ 240V RMS typical supply
• Input voltage: 230V RMS ±10%
• Frequency: 50/60Hz

Control options

• Signal input: 0–10V DC (factory set) or 0–5V DC (SW1 selectable)
• Manual control via 5kΩ potentiometer (not supplied)

Indication & protection

• LED status indicator tracks control signal intensity
• Over-temperature trip at 90°C ±1°C (LED flashes 0.5s on/off)
• Trip out temperature at 85°C ±1°C
• Sensor loss detection (LED flashes 1s on/off)

Cable terminations

• Power & Earth: up to 4mm² cable entry (6kW model)
• Control signal: up to 2.5mm² cable entry
• Terminal torque: 0.5Nm

Fusing

• 30A high-speed semiconductor ferrule fuse (10mm × 38mm)

Environmental

• Maximum ambient temperature: 65°C

Mechanical

• Dimensions: 140mm (L) × 99mm (W) × 80mm (H)
• Fixing centres: 75mm (W) × 120mm (L), 4 × 4.5mm holes (top key-hole slots)
• Weight: 1.1kg

Applications

Ideal for single-phase mains resistive heating loads, particularly in:

• HVAC systems
• Battery heaters
• Hot water tanks
• Heating cables
• Process heating equipment

Optimise your single-phase resistive load control with the reliable and efficient PR1 thyristor stacks. Whether for HVAC applications or industrial processes, the PR1 series delivers robust performance and easy installation, ensuring seamless, safe operation.