Need a heat sink or mounting on steel cover on my 130 amp welder good enough?

For this product, I recommend an aluminum heat sink with heat sink paste, sheet metal is a poor heat sink.

Since a heat sink is to be attached on the bottom, how are you to attach a heat sink AND mount the rectifier?

In my case. I used the metal body of my welder as a mounting surface (bridge rectifier inside, heatsink outside). Also used thermal paste for a better heat transfer.

Is the current rated per one diode?

Generally in a DC circuit they are called diodes as the block and conduct in one direction. When (4) are connected in a full wave bridge in a single-phase circuit they are called a rectifier bank and in a car alternator there are (6) diodes in their full wave bridge. All the diodes in this full wave single-phase rectifier are rated for 1,600 volts and 200 amps.

Will this work in reverse dc to ac and how?

This would not work to convert dc to ac. A rectifier uses diodes to allow the ac current to only flow in one direction, which results in a, basically, pulsating dc current. What you would need is an inverter, to convert dc to ac current, rather than a rectifier

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MDQ-200A

Product ID: 225228363

Details

Brand
Baomain
Color
Black
Noise Control
None
Model Name
MDQ-200A
Connectivity Technology
Wireless

⚡200A High-Current Output

🔄Single-Phase Full-Wave Rectification

🔋1600V Peak Reverse Voltage

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13.41 OMR

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Description

⚡ Convert with Confidence: Power your projects with industrial-grade precision!

BUILT TO LAST - Durable metal-plastic hybrid design with secure 4-terminal connections.
VOLTAGE GUARDIAN - 1600V rating ensures robust safety in high-voltage setups.
PLUG PLAY READY - Compact 95x75x31mm size fits effortlessly into your power systems.
SEAMLESS CONVERSION - Full-wave rectification delivers smooth, efficient DC output.
POWERHOUSE PERFORMANCE - Handles heavy-duty 200A current for industrial-grade reliability.

The Baomain MDQ-200A Bridge Rectifier is a high-performance single-phase diode module designed for reliable AC to DC conversion. With a robust 200A output current and a 1600V peak reverse voltage rating, it ensures efficient full-wave rectification in demanding industrial environments. Its compact, durable design with 4 secure terminals makes it ideal for power supplies, DC motor drives, and automation equipment.

Specifications

Unit Count	1.0 Count
Water Resistance Level	Not Water Resistant
Is Electric	Yes
Antenna Location	Power Supply
Compatible Devices	Single-phase power supplies, DC motors, and other 1600V DC-compatible devices
Additional Features	Lightweight
Enclosure Material	Plastic
Specific Uses For Product	Business
Color	Black
Connectivity Technology	Wireless
Noise Control	None

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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