F.S.P 50A Push-Button Circuit Breaker for MerCruiser Mercury Volvo Penta — Weatherproof, Dual-Voltage Replacement (3854164)

The F.S.P push-button circuit breaker is a 50-amp, weatherproof replacement designed to restore electrical protection in compatible MerCruiser, Mercury and Volvo Penta marine engines.

If a tripped breaker or a corroded original part is interrupting power on your boat, this F.S.P replacement gives you a direct-fit, durable solution. Engineered to match common OEM dimensions and terminal layouts, it works with many MerCruiser / Mercury and Volvo Penta models listed in the fitment, and includes mounting hardware so you can install it right away.

Which engine models and serial ranges will this breaker fit?

This breaker covers a broad selection of MerCruiser, Mercury Quicksilver and certain Volvo Penta applications across multiple engine families and serial ranges. The full fitment list includes crate, inboard, sterndrive and remanufactured engines — check your engine’s model and serial to confirm compatibility.

• Covers 3.0L through 8.6L engines in specific serial ranges for Quicksilver and MerCruiser listings.
• Includes many 5.7L, 6.2L, 6.3L and 8.1L variants, including MPI, Bravo, Alpha and tow configurations.
• Replaces OEM part numbers such as 3854164, 88-11178A01, 18-69550 and related cross-references.

How does this breaker handle marine conditions and electrical load?

Built for the marine environment, the unit is weatherproof and trip-free to prevent nuisance resets under fault conditions. Rated for 50 amps, it supports both 120V AC and 32V DC systems commonly found in marine electrical setups.

• Weatherproof housing resists moisture and salt exposure for longer service life.
• Trip-free design ensures it stays open during sustained faults until manually reset.
• Dual-voltage rating (120V AC / 32V DC) fits a range of onboard circuits.

What’s included and what do I need to install it?

The package arrives ready for swap-in installation: one circuit breaker with the matching fasteners, nuts and washers. You’ll only need basic hand tools and to verify terminal torque and secure grounding when replacing an old or damaged breaker.

• Included: 1x circuit breaker, 2x screws, 2x nuts, 2x washers for mounting.
• Direct OEM replacements: part numbers 88-11178A01, 3854164, 18-69550 and others.
• Recommended tools: screwdriver, wrench for terminals, and a multimeter to verify connections.

Will this replacement match the original breaker’s fit and function?

Yes — the F.S.P unit is manufactured to match common OEM dimensions and terminal arrangements so it installs where the original breaker sat. Always compare physical dimensions and terminal placement before final installation to ensure an accurate fit.

• Designed as a direct replacement for referenced OEM part numbers.
• Hardware included to replicate original mounting and secure electrical connections.
• Inspect original breaker panel and wiring for corrosion before installation.

Who is this for: This F.S.P 50A push-button circuit breaker is intended for marine owners, boat mechanics and service technicians who need a reliable replacement for worn or tripped breakers in MerCruiser, Mercury/Quicksilver and compatible Volvo Penta engines. It’s suitable for DIY installers comfortable with basic electrical work and professionals seeking a parts match for engine maintenance or panel repairs. Always verify your engine model and serial range against the fitment list before ordering and follow safe electrical practices during installation.