T Tocas E9 300A Manual-Reset DC Circuit Breaker 3/8" Studs IP67 Weatherproof

The T Tocas E9 is a 300 amp manual-reset DC circuit breaker with a switch button and 3/8" studs designed to protect 12–48V systems in marine, automotive, and off-grid applications.

This compact, serviceable circuit breaker replaces single-use fuses and delivers high interrupt capacity in a rugged, weatherproof package. Built to SAE standards and UL-rated materials, the E9 handles heavy loads like winches, inverter feeds, battery banks, and DC sound systems while offering a manual push-to-reset control for quick troubleshooting without part replacement.

How does this breaker protect electrical systems under heavy load?

The E9 interrupts fault currents rapidly to prevent wiring or equipment damage. Its tested interrupt capacities ensure safe operation across common DC voltages so high-current faults are cleared without catastrophic failure.

• 300 amp continuous rating for 12–48V systems
• Interrupt capacity: 2,500A @ 14Vdc and 1,500A @ 48Vdc
• Meets SAE J553, J1248, J1625 standards for performance
• Manual reset button for quick reactivation after fault removal

Is the E9 suitable for wet or outdoor environments?

Yes — the E9 is built with weather resistance in mind. A waterproof IP67 housing and a thermoplastic UL 94V-0 enclosure let it operate in damp or exposed installations while protecting internal components from moisture and dust.

• IP67-rated sealed housing for submersion protection
• Thermal plastic UL 94V-0 for flame retardance and durability
• Operating temperature range from -32ºC to 82ºC
• Protective stud insulator included for safe terminal wiring

What mounting and wiring details should installers know?

Installation is straightforward with the E9's extended surface mount design and standard 3/8"-16 studs. The studs accept heavy gauge lugs and the compact footprint fits tight spaces typical on boats, RVs, and vehicle batteries.

• 3/8"-16 threaded studs for common lug compatibility
• Extended surface mount for easy panel or bulkhead attachment
• Compact dimensions to save space in tight control areas
• Protective stud insulator reduces risk of accidental shorting

Which systems and applications benefit most from this breaker?

The E9 is designed for demanding DC environments where reusable overcurrent protection and ignition safety are important. It is suitable for marine, automotive, recreational, and stationary battery systems that need a high-current, resettable protection device.

• Marine: bilge pumps, house banks, and winches (meets J1171 and UL1500 ignition protection)
• Automotive and truck: starter circuits, auxiliary batteries, and high-current accessories
• RV and trailer systems: inverter inputs, battery chargers, and distribution panels
• Recreational: ATVs, UTVs, DC sound systems, and onboard electronics

Who is this for? The T Tocas E9 300A manual reset breaker is for installers, boat owners, vehicle electricians, and DIY technicians who want a reliable, reusable overcurrent device with strong interrupt capability and environmental protection. Choose the E9 when you need a compact, ignition-protected breaker that simplifies troubleshooting and replacement compared with single-use fuses.