55A 21V Brushless Angle Grinder Control Board | Power Tool

55A 21V Brushless Motor Controller Board for Angle Grinders & Polishers

Upgrade or restore your brushless power tools with this high-performance 55A 21V Control Board — a compact, efficient motherboard designed for brushless lithium-powered angle grinders, polishing machines, and electric wrenches. Whether you're a DIY hobbyist or a seasoned tradesperson, this replacement controller delivers reliable, smooth motor management to keep your tools running at peak efficiency.

Key Features

• High Current Capacity: Rated at 55A and 21V, this control board provides robust driving force for demanding grinding and polishing tasks.
• Efficient Brushless Motor Control: Engineered for brushless motors, delivering quieter operation and extended tool longevity compared to brushed alternatives.
• Strong Noise Suppression: Advanced noise control circuitry ensures smooth, efficient operation — making grinding and polishing work faster and more consistent.
• Wide Compatibility: Adapts to various brands and models of angle grinders and polishing machines, making it a versatile replacement part for your workshop.
• Intuitive & User-Friendly: Simple interface design — no deep technical expertise required. Suitable for all skill levels.
• Compact & Portable: Lightweight and small form factor, easy to install and transport.

Specifications

• Voltage: 21V
• Current: 55A
• Compatible Tools: Brushless angle grinders, polishing machines, electric wrenches
• Package Contents: 1 x Control Board
• Material: Electronic PCB components
• Size: As shown in product images

Made in Mainland China.

Please Note

• Due to manual measurement, please allow a dimensional tolerance of 1–3mm.
• Colors may vary slightly from product images due to differences in monitor calibration. Please refer to the actual item received.

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Helpful Resource

For safety guidance when working with power tools and electrical components, refer to the OSHA Electrical Safety Standards to ensure safe handling and installation practices.

Frequently Asked Questions

Q: What types of power tools is this 55A 21V control board compatible with?

A: This brushless motor control board is compatible with a wide range of 21V brushless angle grinders, polishing machines, and electric wrenches from various brands. Always verify your tool's voltage and current specifications before installation to ensure compatibility.

Q: Is this control board easy to install without professional knowledge?

A: Yes. The board features a simple and intuitive interface design, making it accessible for users without deep technical expertise. However, basic familiarity with power tool electronics is recommended. If unsure, consult a qualified technician for installation.

Q: What is included in the package?

A: Each package contains 1 x 55A 21V Brushless Angle Grinder Control Board. No additional accessories are included.

Q: Can this board handle heavy-duty grinding and polishing tasks?

A: Absolutely. With a 55A current rating and 21V operating voltage, this controller is built to deliver strong, stable power output for demanding grinding, polishing, and cutting applications, ensuring efficient and consistent tool performance.