--- product_id: 65447756 title: "BAOMAIN Bridge Rectifier, MDQ-300A 300A 1600V Single Phase AC to DC Full Wave Diode Module, 4 Terminals with Isolated Mounting Base for DC Motor & PWM Converters" brand: "baomain" price: "฿3232" currency: THB in_stock: true reviews_count: 8 category: "Baomain" url: https://www.desertcart.co.th/products/65447756-baomain-bridge-rectifier-mdq-300a-300a-1600v-single-phase-ac store_origin: TH region: Thailand --- # BAOMAIN Bridge Rectifier, MDQ-300A 300A 1600V Single Phase AC to DC Full Wave Diode Module, 4 Terminals with Isolated Mounting Base for DC Motor & PWM Converters **Brand:** baomain **Price:** ฿3232 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** BAOMAIN Bridge Rectifier, MDQ-300A 300A 1600V Single Phase AC to DC Full Wave Diode Module, 4 Terminals with Isolated Mounting Base for DC Motor & PWM Converters by baomain - **How much does it cost?** ฿3232 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/65447756-baomain-bridge-rectifier-mdq-300a-300a-1600v-single-phase-ac) ## Best For - baomain enthusiasts ## Why This Product - Trusted baomain brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Baomain MDQ-300A Industrial Single Phase Bridge Rectifier (300A 1600V) The Baomain MDQ-300A is a heavy-duty single-phase bridge rectifier designed for professional-grade AC to DC power conversion. Featuring a robust four-diode bridge configuration, this module provides stable full-wave rectification for high-power electrical systems, ensuring maximum efficiency and reliability in industrial environments. Technical Specifications:Model: MDQ-300AMax. Average Forward Rectified Current: 300ARepetitive Peak Reverse Voltage (VRRM): 1600VPhase: Single PhaseConfiguration: 4-Diode Bridge for Full-Wave RectificationTerminals: 4 Heavy-Duty Screw TerminalsModule Dimensions: 108 x 67 x 35mm (4.25" x 2.64" x 1.6")Mounting Hole Diameter: 6.5mm (0.26")Mounting Hole Distance: 87mm (3.42")Net Weight: 526gCore Features:Superior Protection & High Reliability: Engineered with unique glass passivation technology, this module offers exceptional stability and resistance to moisture and oxidation for a significantly longer service life.Isolated Mounting Base: Features an electrically isolated base for enhanced safety during high-voltage installations, paired with a robust metal casing designed for optimal heat transfer.Efficient Power Conversion: The standardized bridge circuit configuration minimizes energy loss and voltage drops, making it ideal for continuous industrial duty cycles.Standardized Industrial Build: Precision dimensions and mounting hole specifications allow for easy integration or replacement in existing power cabinets and CNC control panels.Typical Applications:This versatile power module is engineered for a wide range of DC power supply requirements, including:DC Power Supplies: Ideal for industrial instrument equipment and high-current battery charging systems.Motor Control: Perfect for DC motor excitation power supplies and input rectification for PWM frequency converters.Power Conversion: Widely used in switch power supplies, auxiliary current inverters, and automated manufacturing systems.Note: To maintain component longevity and prevent overheating during high-current operation, the use of an appropriately sized heat sink and thermal grease is mandatory. Review: Works great to convert older AC buzzbox welders to DC - I bought this BR to convert my older Century AC “BuzzBox” welder to DC, as other buyers have done & as shown on several YouTube videos. I chose to retain the AC welding connections and tied the bridge rectifier into the existing system using new 2-gauge welding cable and adhesive-type heat shrink. It works! And it works great! Really makes welding with 7018 rod a breeze (cleaner welds, easier to keep burning rods, less splatter, less current required). Keep in mind that for clean 7018 welding, you will need to use a POSITIVE ground; this didn’t work so well for me with 6011 so I switched back to Negative ground for 6011 and it worked great that way. I installed Riverweld Tig-welding plugs/connectors so I can easily switch between Positive/Negative ground depending upon which type of rod I am using. Very happy with this Bridge Rectifier! Review: When you need to convert a AC welder to DC..reach for these!! - I have done plenty of AC to DC welders with these..Everytime I need one for a welder..I reach for these!! ## Features - 【High Capacity 300A 1600V】 Engineered for heavy-duty industrial performance, the MDQ-300A bridge rectifier supports a maximum average forward rectified current of 300A and a repetitive peak reverse voltage of 1600V - 【Full Wave Single Phase Efficiency】 This full bridge rectifier features a high-efficiency configuration with four diodes connected in a single-phase bridge setup, providing stable and reliable power conversion for instrument equipment - 【Superior Isolation & Reliability】 Built with an isolated mounting base and unique glass passivation technology, this diode module rectifier ensures high reliability and enhanced safety during high-power operations - 【Universal Industrial Applications】 Versatile enough for DC motor excitation, PWM frequency converter inputs, and switch power supply auxiliaries, making it an essential rectifier bridge for various electrical systems - 【Precision Dimensions & Easy Install】 Compact footprint at 108 x 67 x 35mm (4.25" x 2.64" x 1.6") with standard 87mm mounting hole distance, allowing for seamless integration into existing industrial cabinets and hardware setups ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07CH9NN59 | | Date First Available | April 19, 2018 | | Item Weight | 1.17 pounds | | Item model number | MDQ-300A | | Manufacturer | Baomain Electric Co.,Ltd | | Package Dimensions | 4.37 x 3.54 x 2.64 inches | ## Images ![BAOMAIN Bridge Rectifier, MDQ-300A 300A 1600V Single Phase AC to DC Full Wave Diode Module, 4 Terminals with Isolated Mounting Base for DC Motor & PWM Converters - Image 1](https://m.media-amazon.com/images/I/61sdZbPYjzL.jpg) ## Available Options This product comes in different **Model** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great to convert older AC buzzbox welders to DC *by S***5 on August 23, 2023* I bought this BR to convert my older Century AC “BuzzBox” welder to DC, as other buyers have done & as shown on several YouTube videos. I chose to retain the AC welding connections and tied the bridge rectifier into the existing system using new 2-gauge welding cable and adhesive-type heat shrink. It works! And it works great! Really makes welding with 7018 rod a breeze (cleaner welds, easier to keep burning rods, less splatter, less current required). Keep in mind that for clean 7018 welding, you will need to use a POSITIVE ground; this didn’t work so well for me with 6011 so I switched back to Negative ground for 6011 and it worked great that way. I installed Riverweld Tig-welding plugs/connectors so I can easily switch between Positive/Negative ground depending upon which type of rod I am using. Very happy with this Bridge Rectifier! ### ⭐⭐⭐⭐⭐ When you need to convert a AC welder to DC..reach for these!! *by G***Y on March 14, 2025* I have done plenty of AC to DC welders with these..Everytime I need one for a welder..I reach for these!! ### ⭐⭐⭐⭐⭐ Does the job. *by L***N on October 5, 2024* I used this to turn a cracker jack lincoln AC stick welder into a DC which makes a HUGE difference. Now I just need to add an internal fan to up the duty rating. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.th/products/65447756-baomain-bridge-rectifier-mdq-300a-300a-1600v-single-phase-ac](https://www.desertcart.co.th/products/65447756-baomain-bridge-rectifier-mdq-300a-300a-1600v-single-phase-ac) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-30*