Car High Current Audio Fuse – 20A to 300A Flat Head Tubular Circuit Breaker with M6 Terminal

This car high current audio fuse circuit breaker provides essential overcurrent protection for automotive electrical systems. Whether you are upgrading a car audio system, repairing a vehicle wiring harness, or installing auxiliary circuits, selecting the correct current rating is crucial to prevent damage from excess current. The range covers 20A, 30A, 40A, 50A, 60A, 70A, 80A, 100A, 120A, 150A, 200A, 250A, and 300A, giving you flexibility to match your circuit requirements. Each unit features a flat head tubular shape with a carbon steel blue and white zinc head and a 16-copper tube terminal fitted with an M6 copper flat pad for secure connections. The breaker can be ordered with or without matching accessories (CB5 type) for different mounting setups.

Features and Construction

The circuit breaker is built from common materials used in automotive electrical components. Understanding the construction helps you decide if it fits your application.

Material and Build

The head is made from carbon steel with a blue and white zinc coating, which provides basic corrosion resistance. The terminal is a 16-copper tube with a copper flat pad (M6X12X1). The flat head tubular shape allows for straightforward push-in or screw-fastened installation in fuse holders or breaker panels.

Size and Practical Fit

Head dimensions are KA4*25X7 (approximately 25mm length, 7mm diameter per typical KA4 sizing). The terminal pad uses an M6 thread (6mm) with a 12mm long copper pad and 1mm pitch. This size is common in automotive fuse blocks and power distribution points.

Uses and Placement

This circuit breaker is intended for automotive circuits requiring resettable overcurrent protection up to 300A. It suits high-current applications such as audio amplifiers, inverter feeds, or main battery fusing.

Car Audio Systems

For car audio installations drawing high current, a properly rated circuit breaker protects the amplifier and wiring from short circuits. The resettable feature avoids the need to replace blown fuses during troubleshooting.

General Automotive Wiring

Use as a main circuit breaker for auxiliary battery banks, lighting upgrades, or winch systems where intermittent high current is expected. The flat head and M6 terminal fit many aftermarket fuse holders.

Benefits and Buying Value

Selecting the correct amperage and matching accessories ensures reliable protection without nuisance tripping.

Reuse and Low Maintenance

Unlike glass fuses that must be replaced after a fault, this circuit breaker can be reset manually (if using the resettable type). This saves time and the cost of spare fuses.

Why Choose This Product

With a broad current range from 20A to 300A and the option to include accessories, you can tailor the breaker to your exact circuit. The flat head tubular design and M6 terminal are standard sizes that fit many existing automotive fuse blocks.