Bussmann CB185-100 Automotive Circuit Breaker 100A — Resettable Thermal Trip, Compact Rugged Design

The Eaton Bussmann CB185-100 is a 100-amp, CB185-series automotive circuit breaker built to protect vehicle and marine DC circuits from overloads and short conditions.

Compact and rugged, this CB185-100 breaker provides dependable overcurrent protection for automotive, marine, and off-road electrical systems where resettable protection is preferred over fuses. Manufactured by Bussmann in Mexico and designed for repeated trip-and-reset cycles, the CB185 family combines predictable thermal trip behavior with a space-saving footprint suitable for dashboards, engine bays, and equipment panels.

How does the CB185-100 protect my vehicle's electrical system?

The breaker limits current when a circuit draws more than its rated 100 A, opening the circuit to prevent wiring overheating and component damage. After the fault is cleared, it can be manually or automatically reset depending on installation, restoring power without replacing parts.

• Thermal/magnetic-style trip profile for predictable response under overloads
• Resettable design reduces downtime and spare parts needs
• Rated for continuous 100 A service with defined trip thresholds
• Suitable for DC electrical systems commonly found in vehicles and boats

Where and how should I install the CB185-100?

Install the CB185-100 in a dry, accessible location near the distribution point or load it protects, using appropriate mounting hardware and wire terminals. Follow vehicle wiring best practices and torque specs; ensure the breaker’s voltage and current ratings match the circuit.

• Mount on a secure panel or bracket with recommended fasteners
• Use wiring sized for 100 A continuous current and appropriate insulation
• Keep the breaker clear of excessive heat sources and moisture
• Verify polarity and terminal tightness to prevent heat buildup

What maintenance and testing does this CB185 breaker require?

Routine visual inspections and occasional functional checks ensure reliable operation. Look for corrosion, loose connections, or physical damage, and exercise the manual reset to confirm mechanical operation.

• Inspect terminals and housing for corrosion or wear
• Confirm terminal torque and wiring condition annually or after service
• Test trip/reset action under controlled conditions if troubleshooting
• Replace the breaker if mechanical damage, persistent arcing, or heat damage is found

Who is this for? The CB185-100 is ideal for electricians, marine technicians, fleet managers, and DIY vehicle enthusiasts who need a durable, resettable 100 A protection device. It fits situations where repeated resets are likely, spares should be minimized, and dependable thermal trip behavior is required. Because it’s made by Bussmann in Mexico, this breaker is suited to professional maintenance, retrofits, OEM installations, and upgrades across automotive, marine, and specialty equipment applications.