Bussmann CB185 150A Type III Circuit Breaker — Ignition-Protected, Sealed Flush-Mount

The Bussmann Series CB185 150A Type III circuit breaker is a flush-mount, ignition-protected high-amperage breaker designed to protect auxiliary and battery charging circuits in trucks, RVs, buses and marine installations.

This genuine Bussmann CB185 is built for demanding vehicle and marine environments where dependable overcurrent protection, corrosion resistance and ignition protection are required. The sealed, waterproof housing and flush-mount design let you install the breaker in instrument panels, battery compartment areas and accessory boxes while meeting SAE J1171 ignition-protection requirements. It’s engineered to work with multi-battery systems, battery isolators and charging circuits, helping prevent damage from overloads or short circuits in auxiliary circuits and charging pathways.

How does this breaker perform in wet or harsh environments?

The CB185’s sealed, waterproof housing protects internal components from moisture, dust and road spray so it continues to operate reliably in marine and off-road conditions. Its construction reduces the chance of corrosion and electrical faults caused by ingress.

• Sealed enclosure designed for water resistance and long-term durability
• Flush-mount form reduces exposure to impact and contaminants
• Materials chosen to resist corrosion from salt and road chemicals

What vehicles and systems is the CB185 suitable for?

The CB185 Type III is intended for auxiliary and accessory circuits in commercial vehicles, RVs, buses, trucks and boats. It’s commonly used in systems with battery isolators and multi-battery charging arrangements where reliable high-current protection is needed.

• Auxiliary power circuits for lighting, inverters, and accessories
• Battery charging circuits with isolators in multi-battery setups
• Marine and ignition-protected installations that follow SAE J1171

What electrical specifications and safety standards does it meet?

The CB185 Type III is a high-amperage device engineered to protect circuits up to its published rating and to meet applicable ignition-protection standards. It complies with SAE J1171 for ignition protection, ensuring safer use around fuel-vapor environments in marine and vehicle applications.

• Type III design for robust, repeatable trip performance
• Meets SAE J1171 ignition protection standard
• Flush-mount style for secure panel installation and tidy wiring

How easy is it to install and maintain?

Installation is straightforward for technicians and DIYers familiar with vehicle electrical systems. The flush-mount housing and clear terminal access simplify wiring, while the sealed construction minimizes routine maintenance related to corrosion or moisture intrusion.

• Flush-mount design installs neatly into instrument panels or boxes
• Accessible terminals for standard ring or lug connections
• Sealed design reduces need for periodic cleaning or resealing

Who this product is for: The Bussmann Series CB185 150A Type III circuit breaker is for fleet managers, marine electricians, RV owners and anyone installing or upgrading high-current auxiliary or charging circuits. Choose this breaker when you need a proven, ignition-protected device with a sealed, flush-mount housing that integrates with battery isolators and multi-battery charging systems. It’s ideal for environments that demand water resistance, corrosion resistance and compliance with SAE J1171, providing reliable overcurrent protection where safety and durability matter.