Bussmann CB185-100 100A Automotive Resettable Circuit Breaker — Single-Pole, Manual Reset

The Eaton Bussmann CB185-100 is a 100 amp automotive resettable circuit breaker built to protect vehicle electrical circuits from overloads while allowing fast manual or automatic reset.

This single-pole, CB185 series breaker from Bussmann delivers robust overcurrent protection designed for automotive, marine, and light industrial electrical systems. Manufactured to consistent quality standards in Mexico, it offers a compact form factor for panel or inline mounting and a manual trip/reset mechanism for quick serviceability. Ideal for applications where reliable, reusable protection is preferred over fuses, the CB185-100 helps maintain circuit continuity after an overload event without requiring fuse replacement.

How does this breaker protect automotive electrical systems?

The CB185-100 interrupts excessive current flow to prevent wiring and component damage during overloads or short circuits. It trips when current exceeds its thermal-magnetic trip curve, isolating the affected circuit until conditions normalize or the breaker is reset. The reset capability reduces downtime and maintenance cost compared with single-use fuses.

• 100 A thermal-magnetic trip element for overload and short-circuit response
• Manual push-button trip/reset for rapid restoration of service
• Single-pole design suited to 12V–48V vehicle electrical architectures
• Durable construction for repeated cycling and long service life

Where and how can I mount the CB185-100?

The CB185 series is adaptable to common automotive and marine installations, fitting into fuse panels, bulkhead mount arrangements, or inline with battery feeds. Mounting hardware and terminal design allow straightforward connection with ring terminals or distribution blocks. Keep the breaker accessible so it can be manually reset after a trip.

• Panel or bulkhead mounting compatible with standard hole patterns
• Ring terminal-friendly studs for secure power connections
• Compact footprint to fit tight engine-bay or dashboard locations
• Corrosion-resistant materials suitable for marine exposure (verify environment)

What performance and compatibility should I expect?

Built by Bussmann to meet automotive electrical protection needs, the CB185-100 performs consistently under typical operating temperatures and vibration conditions. It pairs with common battery systems and aftermarket accessories, supporting protection for main feeds, alternators, inverters, and heavy accessories. Check system voltage and amp draw to confirm the 100 A rating is appropriate for the circuit.

• Engineered for vehicle and light-industrial electrical systems
• Resettable design reduces parts replacement and downtime
• Works well with alternator outputs, starter circuits, and accessory banks
• Manufactured in Mexico to Bussmann quality standards

Who is this for: technicians, fleet managers, boat owners, and DIY installers who need dependable, reusable overcurrent protection for 12V–48V circuits will find the Eaton Bussmann CB185-100 a practical choice. It’s suited to maintenance, repairs, custom electrical builds, and OEM replacements where a rugged, serviceable 100 amp breaker is required. Before installing, verify electrical load, mounting space, and environmental exposure to ensure the CB185-100 matches your system requirements.