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Description
300Amp Circuit Breaker - 3 Pack300Amp 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
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
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 5
Tasty and reasonable
Flavor Name: Ceremony Matcha-1.06oz, Flavor Name: Ceremony Matcha-1.06oz
Very nice and tasty. Very reasonable price.
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Reviewed in the United States on March 7, 2026
★★★★★ 5
Good Value
Color: Black
Good quality SS cup. Not much else to say.
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Reviewed in the United States on February 26, 2026
★★★★★ 5
Absolutely fantastic
Color: Black, Color: Black
Absolutely solid product and would recommend this to anybody as a wide mouth espresso measuring cup.
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Reviewed in the United States on February 7, 2026
★★★★★ 5
Nice cup!
Color: Silver
Nice measuring cup. I appreciate the pretty wooden handle. Using this espresso measuring cup has upped my latte game considerably!
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Reviewed in the United States on November 28, 2025
★★★★★ 4
Decent 3oz measurer
Color: Black, Color: Black
I like it, it works. However it is a bit heavy on the handle side. You think somebody like maestri house would get it correct. Could have used heavier metal on the measuring cup. Anyways I keep it it's nice.
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Reviewed in the United States on January 12, 2026