MTX Bidirectional Thyristor 40A–350A 1600V Voltage Regulation Module

MTX High-Power Bidirectional Thyristor — Precision Voltage Regulation for Industrial & Commercial Use

The MTX Series Bidirectional Thyristor is a robust, high-performance power semiconductor module engineered for reliable AC voltage regulation and switching across a wide range of industrial applications. Available in current ratings from 40A to 350A with a 1600V voltage rating, this module delivers the switching precision and thermal stability that demanding electrical systems require.

Made in Mainland China.

Key Features

• Wide Current Range: Available in 40A, 55A, 70A, 90A, 100A, 110A, 200A, 300A, and 350A ratings to match your specific load requirements
• High Voltage Rating: 1600V blocking voltage ensures safe operation in high-demand AC circuits
• Bidirectional Operation: Controls current flow in both directions — ideal for AC switching and voltage regulation without rectification
• Low On-State Losses: Efficient conduction minimizes heat generation and energy waste
• Versatile Form Factor: Standard bolt-down / module packaging for easy integration into existing control panels and heat sinks
• Industrial Grade Reliability: Built to withstand continuous duty cycles in high-temperature environments

Typical Applications

• Electronic switching circuits
• AC motor speed control
• Rectifier power supplies
• Industrial electric furnaces & kilns
• Resistance wire, heating rod, and electric heating element control
• Electric water heaters & industrial induction cookers
• Transformer & frequency converter control
• Generator excitation control
• Cutting machine power stages
• Coil drivers & electric vehicle (EV) charging systems

Important Selection Guidelines

The nominal current printed on the module is the average on-state current, not the continuous RMS operating value. Always apply adequate safety margins when selecting your module:

• Resistive Loads: Actual current (A) × 2.0–2.5 = Module nominal current (A)
• Inductive Loads: Actual current (A) × 6–7 = Module nominal current (A)

Thermal Management

When operating at actual working currents exceeding 5A, a properly rated heat sink must be fitted to the module. Adequate thermal dissipation is essential for long-term reliability and safe operation.

Availability & Bulk Orders

Standard MTX ratings are stocked and available for immediate dispatch. For bulk or large-quantity orders, please contact customer service to confirm stock levels and lead times before placing your order.

Technical Specifications at a Glance

For reference information on power semiconductor safety standards and industrial electrical component guidelines, visit the OSHA Electrical Safety Resource Center.

Frequently Asked Questions

Q: What is a bidirectional thyristor and how does it differ from a standard thyristor?

A: A bidirectional thyristor (often called a TRIAC-type module) can conduct and switch current in both directions of an AC cycle, making it ideal for AC voltage regulation and switching. A standard (unidirectional) thyristor only conducts in one direction and is better suited for DC or rectifier circuits. The MTX series bidirectional modules are specifically designed for AC load control applications such as heaters, motors, and lighting dimmers.

Q: How do I choose the right current rating for my application?

A: Always derate the module from its nominal current rating based on load type. For resistive loads (heating rods, resistance wires), multiply your actual operating current by 2.0–2.5 to find the minimum nominal module rating. For inductive loads (motors, coils, transformers), multiply by 6–7. For example, a 10A resistive load requires at least a 20–25A rated module; a 10A inductive load requires a 60–70A rated module.

Q: Do I need a heat sink with this thyristor module?

A: Yes — whenever your actual working current exceeds 5A, a suitably rated heat sink is required. Without proper thermal management, the junction temperature will rise and can significantly reduce device lifespan or cause failure. Always match your heat sink's thermal resistance to the module's power dissipation at your maximum load current.

Q: What voltage rating do I need for a standard 220V AC application?

A: For 220V AC mains (peak voltage ~311V), a 1600V-rated module like the MTX series provides substantial margin above peak line voltage and transient spikes, making it a safe and reliable choice for 110V–440V AC industrial applications.

Q: Is the MTX thyristor module suitable for EV charging systems?

A: Yes. The MTX series is commonly used in electric vehicle (EV) charging equipment where high-current, high-voltage AC switching and regulation are required. Select the appropriate current rating based on your charger's maximum load current, applying the recommended inductive-load safety margin.