PR3-DIN-12kW | 415V Three-Phase Thyristor Stack | BMS Control

Description PR3-DIN-12kW 415V Three-Phase Thyristor Stack (12kW / 17A) The PR3-DIN range of thyristor stacks offers seamless control of three-phase electric heating loads from a Building Management System (BMS) or similar controller. Utilizing zero volts switching technology, these burst-firing controllers minimise Radio Frequency Interference (RFI) issues. Available in 12kW and 18kW models for a typical AC voltage supply of 415V, they employ a two-thirds control technique. Key features include DIN rail mounting capability, DC voltage signal control, temperature trip with automatic reset, alarm output, and LED ‘OUTPUT-ON’ indication. Additionally, these models provide easy access to internal signal and power terminals and require no additional heatsink for any power rating. Applications The PR3-E Series is ideal for controlling electric heating coils, heating cables, and electric furnaces. Its robust design ensures reliable performance in various industrial heating applications. Key Features Seamless Three-Phase Control: Efficiently manages three-phase electric heating loads. Zero Voltage Switching: Minimizes RFI issues for a smoother operation. Two-Thirds Control Technique: Available in 12kW and 18kW models for 415V AC supply. DIN Rail Mounting: Easy installation on TS35 section DIN rail. Temperature Trip with Automatic Reset: Ensures safety with over-temperature protection. Alarm Output: Provides 24V AC or DC alarm output, indicating over-temperature or power supply failure. LED Indicators: Displays ‘OUTPUT-ON’ status for easy monitoring. No Additional Heatsink Required: Simplifies installation and reduces additional component costs. Technical Specifications Power / Current Ratings: 12kW (17A), 18kW (25A) @ 415V RMS Input Voltage: 3-phase from 24V to 440V AC RMS Frequency: 50/60Hz Input Signal: 0 to 10V DC Power Supply: Remote 24V AC or DC ± 10% @ 40mA (No supplied) (Required) Terminal Ratings: Rising clamp terminal block for 2.5mm² cable entry (Input signal/alarm/24V supply input) Alarm Output: 24V AC or DC (as power supply) drops to 0V in the event of over-temperature or power supply failure Over-Temperature Protection: Trip in temperature at 90°C ± 5°C, trip out temperature at 85°C ± 5°C Status Indicator: T1 and T3 indicate output ratio Power Terminations: Rising clamp terminal block for 6mm² cable entry Terminal Torque Settings: 0.8Nm (Power Terminals Only) Fusing: 12kW: 20A (20ET), 18kW: 30A (32ET) – High-Speed Semiconductor type fuses or equivalent MCBs Max. Ambient Temperature: 40°C Dimensions: 12kW: 217mm (W) x 87mm (H) x 90mm (D) (including DIN clips) – firing circuit terminals front facing 18kW: 217mm (W) x 87mm (H) x 110mm (D) (including DIN clips) – firing circuit terminals front facing Weight: 12kW: 0.6kg 18kW: 0.95kg The PR3-E Series provides a reliable and efficient solution for controlling three-phase electric heating loads, offering easy installation and robust performance tailored for industrial HVAC applications.