Mercury MerCruiser Quicksilver Circuit Breaker 11178A01
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Mercury / MerCruiser Quicksilver Circuit Breaker — 11178A01
The Mercury Quicksilver 11178A01 is a genuine OEM 50-amp marine circuit breaker used on many Mercury outboard and MerCruiser sterndrive electrical systems. It protects engine wiring and electrical components from overloads by automatically interrupting the circuit if excessive current is detected.
Key Specifications
-
Part Number: 11178A01 (also listed as 88-11178A01)
-
Current Rating: 50 amps
-
Connection Type: Dual threaded stud / nut terminals
-
Includes: Mounting hardware
-
OEM Brand: Mercury Marine / Quicksilver
Function
The circuit breaker protects the engine’s main electrical system by:
-
Interrupting power if current exceeds 50 amps
-
Preventing wiring damage or electrical fires
-
Resetting after the overload condition is corrected
These breakers are typically installed in the engine wiring harness or power distribution circuit.
Typical Applications
Commonly used on various marine engines including:
-
Mercury outboards
-
MerCruiser sterndrives
-
Some inboard marine engines
It replaces earlier part numbers such as 88-11178, and is widely used across multiple marine electrical systems requiring a 50-amp protected circuit.
Cross-Reference / Replacement Numbers
-
88-11178
-
88-11178A01
-
806950 (some catalogs)
-
Aftermarket equivalents available from Sierra and other marine parts brands.
⚠️ Fitment Tip:
Always confirm compatibility with the engine model and serial number. Mercury uses several different amperage breakers depending on the engine electrical load and wiring configuration.
Shipping: Ships same or next day for fast Canada wide shipping.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.