300Amp Circuit Breaker - Pack of 3

Key Features

• Current Rating: 300 Amps
• Voltage Range: DC 12V - 48V
• Trip Mechanism: Thermal
• Reset Type: Manual push-button reset switch; also functions as a master disconnect
• Housing: High-temperature rated, water-resistant enclosure
• Terminals: #10-32 stainless steel threaded studs
• Mounting: Surface mount with two mounting holes
• Quantity: Includes three individual 300A circuit breakers

Replaces / Cross-Reference Part Numbers

• Can be used as a direct replacement for Bussmann CB285-300 and CB185-300
• Interchangeable with Blue Sea Systems 7189 and 187-Series 300A breakers
• Replaces similar style surface-mount, manual reset breakers used in automotive and marine applications

Compatibility & Fitment

• Designed for high-current DC electrical systems
• Automotive: Car audio amplifiers, secondary battery systems
• Marine: Trolling motors, anchor winches, bow thrusters
• Recreational Vehicles (RV): Inverter connections, battery banks, solar charge controllers
• Industrial: Heavy equipment, DC motor circuits

When to Replace

• Existing breaker fails to trip during an overcurrent or short-circuit event
• Breaker trips repeatedly under a known, safe load (nuisance tripping)
• The manual reset lever or button is physically broken or will not stay engaged
• Visible signs of heat damage, melting, or cracks in the housing
• Terminals are heavily corroded, preventing a secure electrical connection

Installation Tips

• Disconnect the main power source (battery negative terminal) before beginning installation
• Install the breaker as close to the power source as possible for maximum protection
• Use correct wire gauge (AWG) rated for 300A to prevent wire overheating
• Ensure all cable lug connections are clean and torqued securely to the studs
• Mount in a location that provides protection from direct, high-pressure water spray and excessive engine heat