Phase Sequence Insensitive
Operates normally regardless of the phase sequence.
Three Phase Thyristor Power Controller
Product Overview
The Three Phase AC Power Controller is a high-performance thyristorised module designed for precise, stepless control of high-power resistive and inductive loads. Available in current ratings up to 500 A, with higher-current configurations available on request, it is built for demanding industrial furnaces, ovens, kilns and process heating systems. Phase-sequence insensitive operation eliminates the need to check or correct phase rotation during wiring, while built-in single-phase fault detection helps identify phase-loss conditions during operation. Instantaneous overcurrent protection helps safeguard heaters, wiring and production uptime under continuous industrial duty.
Request QuoteTechnical Specifications
AC Input Voltage / Frequency (Range)
- 110V ±10%
- 230V ±10%
- 380V ±10%
- 415V ±10%
- 480V ±10%
- 50Hz / 60Hz ±5%
Supply System
- 3 Phase
Control Method
- P / PI / PD / PID
Current Rating
- 20A – 500A
- Higher ratings available on request
Isolation
- 2.5KV RMS between Power Circuit and Control Circuit
Control Signal
- 4–20mA DC
- 0–10V DC
- 10k Potentiometer
Features
Designed with advanced thyristor technology to deliver precise control, industrial reliability, comprehensive protection, and seamless integration for demanding heating applications.
External Interlock Facility
Links plant safety chains before power is applied.
PLL for Firing Pulse Synchronization
Phase lock loop keeps firing stable on noisy supplies.
Immune to Line Distortions & Fluctuations
Consistent output despite disturbed supply conditions.
Stepless Power Control
Smooth 0–100% regulation with no stepping.
RC Snubber (MOV) Protection
Suppresses transients across the thyristor stack.
SCRs Rated for 1400V PIV or Above
Generously rated devices for long service life.
Maximum Voltage Limit Facility
Sets a hard ceiling on delivered output voltage.
Heat Sink Over Temperature Protection
Thermal supervision of the engineered heat sink - for force cooled units.
Can Take 10% Overload for 2 Hours
Sustained overload capacity for demanding cycles.
Output Voltage Linear to Input Signal
Predictable, linear response across the full range.
Instantaneous Over Current Trip Protection
Fast-acting overcurrent shutdown to protect the thyristor stack and load.
Fault / Single Phase / Overcurrent LED Indications
Clear LED annunciators for fault, single-phase and overcurrent status.
Trip Relay Potential-Free Contact
Potential-free relay contact for integrating plant interlocks and alarms.
External Trip Reset Facility
Remote reset input for clearing trips without opening the enclosure.
Separate Bias Settings for Voltage & Current Signals
Independent bias trims for accurate voltage and current scaling.
Current Limit Facility
User-set current ceiling to safeguard heaters and cabling.
Applications
Heat Treatment Furnaces
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FAQs
It is used across heat treatment, ceramics, glass, plastics, food processing, textiles and general process heating plants wherever accurate temperature or power regulation is required.
Standard modules are offered from 20A to 500A. Higher ratings and custom panel builds can be engineered on request.
Yes. The controller accepts 4–20 mA, 0–10 V or 10k potentiometer commands from any standard P, PI, PD or PID temperature controller.
It integrates directly with PLC and DCS systems through analog command inputs, external trip/reset and interlock terminals.
Share your load rating, supply voltage and control signal type with our team and we will respond with a technical proposal and pricing.
