T Tocas E9 150A Waterproof DC Circuit Breaker 12–48V Manual Reset, IP67 Protection

The T Tocas E9 150A is a manual-reset, waterproof DC circuit breaker that protects 12V–48V battery systems while serving as a reliable on/off battery disconnect.

Compact yet rugged, the E9 150A breaker combines a Type III manual reset button with 1/4"-28 threaded studs and an extended surface mount to replace a standard 150A fuse in marine, automotive, RV, and battery-powered audio applications. Constructed from UL 94V-0 thermoplastic and rated IP67 for water resistance, it’s engineered to meet SAE J1625, J1171 and UL1500 ignition-protection standards for demanding environments.

How does this breaker protect my boat or vehicle electrical system?

The E9 trips under overcurrent to prevent wiring damage and resets manually to restore power after the fault is cleared. Its ignition-protected certification reduces spark risk in fuel-handling spaces, while robust studs and housing tolerate heavy DC loads and vibrations.

• 150 amp trip rating for high-current DC circuits
• Type III manual reset button for controlled restoration
• 1/4"-28 threaded studs for secure electrical connections
• UL1500 and SAE certifications for ignition safety

Will it work with my 12V trolling motor, RV, or audio system?

Yes — the E9 operates across 12V to 48V DC systems, making it compatible with most marine trolling motors, RV house banks, truck and bus systems, battery chargers, and DC-powered audio amplifiers. Its compact footprint and extended surface mount make installation straightforward in tight panels or battery compartments.

• Voltage range: 12V–48V DC for broad compatibility
• Compact, lightweight design fits limited spaces
• Extended surface mount eases panel mounting
• Replaces a standard 150A fuse while adding reset capability

How resistant is it to water, heat, and vibration?

The housing meets IP67 water-resistance standards and is molded from UL 94V-0 thermoplastic for flame retardance, so the breaker withstands splashes, brief immersion, and elevated temperatures common in engine bays. Threaded studs and a durable housing reduce the risk of connection loosening from vibration.

• IP67 waterproof rating protects against immersion and moisture
• UL 94V-0 thermoplastic resists flames and heat exposure
• Sturdy studs and mount minimize vibration-related failures
• Ignition-protected for safer use near fuel systems

How do I install and reset the breaker safely?

Installation involves mounting the breaker to a flat surface, wiring to the 1/4"-28 studs with proper torque, and ensuring polarity and grounding follow manufacturer and vehicle guidelines. Resetting is done manually by pressing the clearly visible Type III button after fixing the underlying fault.

• Surface-mount with included screw locations for secure fit
• Use ring terminals sized for 1/4"-28 studs and correct torque
• Confirm correct system voltage (12V–48V) before use
• Reset only after diagnosing and clearing the source of the trip

Who is this for: The T Tocas E9 150A breaker is designed for boat owners, RV and overland vehicle builders, fleet operators, audio installers, and anyone who needs a reliable, resettable 150A DC protection device that stands up to marine conditions and ignition-protection requirements. It’s a practical choice when you want fusible protection with the convenience of a manual reset and the durability to handle wet, hot, or vibrating installations.