300A Waterproof Circuit Breaker (12V-48V DC) - 3 Pack

300A Waterproof Circuit Breaker (12V-48V DC)

Key Features

• 300 amp rated manual-reset circuit breaker for 12V-48V DC systems
• Push-button reset lever also functions as a manual disconnect switch
• Waterproof housing suited to marine, engine compartment, and bilge environments
• Surface-mount design with threaded stud terminals for heavy-gauge wiring
  

Replaces / Cross-Reference Part Numbers

This is a generic, unbranded circuit breaker sold under multiple private-label names with no manufacturer part number. It does not cross-reference to a specific OEM part; compatibility should be confirmed by amperage rating (300A), voltage range (12V-48V DC), and stud/terminal size against the existing breaker or wiring being replaced.

Compatibility & Fitment

• Operating voltage: 12V-48V DC
• Rated current: 300A
• Suitable for boats, yachts, RVs, trailers, trolling motors, winches, and heavy-duty DC electrical circuits
• Stud size varies by supplier at this amperage (commonly 1/4" or 3/8"); confirm stud size and wire gauge compatibility before ordering

When to Replace

• Breaker fails to reset or hold a closed circuit after repeated attempts
• Housing shows cracking, corrosion, or water intrusion at the terminals
• Breaker trips well below its rated 300A load under normal operating conditions
• Terminals show heat discoloration, pitting, or looseness that can't be corrected by tightening

Installation Tips

• Disconnect the battery or power source before installing or replacing any circuit breaker
• Confirm the breaker's amperage rating matches the circuit's wiring gauge and load requirements
• Mount on a flat, stable surface away from direct exposure to fuel, oil, or excessive vibration
• Torque terminal connections to the wire lug manufacturer's specification to prevent loosening over time
• If unfamiliar with high-amperage DC wiring, have the installation checked by a qualified marine or auto electrician