MDST Series Three-Phase Rectifier Bridge Thyristor 75A–200A 1600V

Three-Phase Rectifier Bridge Thyristor Module — MDST Series (75A / 100A / 150A / 200A, 1600V)

The MDST Series SCR Three-Phase Rectifier Bridge Module is a high-performance silicon-controlled rectifier (thyristor) power module designed for demanding industrial and commercial applications. Available in 75A, 100A, 150A, and 200A ratings at a maximum forward voltage of 1600V, this module delivers reliable, efficient AC-to-DC conversion in a compact, rugged package. Made in Mainland China.

Key Specifications

• Type: Three-Phase Rectifier Bridge / SCR Thyristor Module
• Available Current Ratings: 75A (MDST75A-16), 100A (MDST100A-16), 150A, 200A
• Max. Forward Voltage: 1600V
• Max. Forward Current: 200A
• Input Voltage: 220V AC
• Condition: New
• Customization: Available upon request

Typical Applications

• AC and DC motor control & static reactive power compensation
• All types of rectifier power supplies
• Electric welding machines
• Industrial heating control
• Frequency converters / variable frequency drives (VFDs)
• Dimming control systems
• UPS (Uninterruptible Power Supply) systems
• Contactless switching circuits
• Battery charge and discharge systems
• Motor soft-start applications

Important Selection & Installation Notes

1. Current Rating Selection
The rated current of this power module represents the average on-state current, not the long-term RMS operating current. Always allow sufficient margin based on your actual working environment:

• Resistive loads: Actual current (A) × 2 to 2.5 = Module nominal current (A)
• Inductive loads: Actual current (A) × 6 to 7 = Module nominal current (A)

2. Heat Sink Requirement
When the actual operating current exceeds 5A, a suitable heat sink must be installed to ensure safe and reliable performance. Failure to do so may result in overheating and reduced module lifespan.

3. Stock & Bulk Orders
Standard models are available in stock for immediate dispatch. For bulk or custom quantity orders, please contact customer service to confirm lead times before ordering.

Why Choose the MDST Series?

• ✔ Wide current range (75A–200A) to suit various industrial power levels
• ✔ High blocking voltage (1600V) for robust, high-voltage circuit protection
• ✔ Compact modular design for easy integration into existing systems
• ✔ Suitable for both new builds and retrofit/upgrade projects
• ✔ Customization available for OEM and specialized industrial requirements

For additional guidance on thyristor and power semiconductor applications in industrial systems, refer to the OSHA Electrical Safety Guidelines for safe installation and handling of high-voltage power components.

Frequently Asked Questions

Q: What is the difference between the MDST75A-16, MDST100A-16, MDST150A, and MDST200A modules?

A: The primary difference is the average on-state current rating — 75A, 100A, 150A, and 200A respectively. All share the same 1600V maximum forward voltage rating and three-phase rectifier bridge topology. Choose your rating based on your load type and apply the appropriate derating factor (2–2.5× for resistive loads, 6–7× for inductive loads).

Q: Does this thyristor module require a heat sink?

A: Yes. Any time your actual operating current exceeds 5A, a properly sized heat sink must be attached to the module. Operating without adequate thermal management at higher currents will reduce performance and may damage the module over time.

Q: Can the MDST Series module be used in a welding machine or frequency converter?

A: Absolutely. The MDST Series is specifically suited for electric welding machines, variable frequency drives (VFDs), UPS systems, motor soft-start circuits, and industrial heating controllers, among other high-power applications.

Q: Is customization available for this SCR rectifier module?

A: Yes, customization is available. For OEM orders or special configurations, please contact customer service with your requirements. Bulk orders should also be confirmed with customer service for accurate lead times and delivery scheduling.