Blue Sea 50A C-Series Double-Pole Toggle Circuit Breaker
Blue Sea 50A C-Series Double-Pole Toggle Circuit Breaker
Magnetic Hydraulic Overcurrent Protection with Trip-Free Operation

DESCRIPTION
Reliable Magnetic Hydraulic Circuit Protection and Switching
The Blue Sea C-Series 50A Double-Pole Toggle Circuit Breaker combines high-capacity circuit switching and accurate overcurrent protection into a single, robust device. Engineered for demanding marine, RV, caravan, and off-grid electrical systems, this breaker simplifies panel design by eliminating the need for separate switches and fuses. Its double-pole configuration allows simultaneous control and isolation of two circuits or both conductors of a single circuit, ensuring comprehensive safety and operational convenience.
Why Choose Magnetic Hydraulic Technology?
Unlike standard thermal breakers that rely on heat to trigger a trip, a magnetic hydraulic circuit breaker uses a precise mechanical and magnetic mechanism. Standard thermal breakers can suffer from nuisance tripping in hot engine bays, enclosed electrical cabinets, or harsh Australian summer conditions because ambient temperature affects their trip point. The Blue Sea C-Series is unaffected by ambient temperature variations, delivering consistent 50A current carrying capacity while still tripping rapidly during genuine overload or short-circuit events.
Key Features and Benefits
- Combined Switching and Protection: Acts as both a heavy-duty manual isolation switch and an automatic overcurrent protection device.
- Magnetic Hydraulic Design: Provides temperature-stable performance, preventing nuisance trips in hot environments while maintaining precise fault response.
- Trip-Free Operation: Enhances system safety by ensuring the internal contacts cannot be manually held closed during an active fault or overcurrent condition.
- Double-Pole Configuration: Mechanically linked poles trip simultaneously if an overcurrent occurs on either line, making it suitable for AC main circuit protection or dual-conductor DC isolation.
- Heavy-Duty Rear Stud Terminals: Designed to accommodate robust cable lugs for secure, low-resistance high-current connections.
- Front-Panel Mounting: Equipped with threaded brass inserts for secure, straightforward installation into custom switchboards and distribution panels.
- Clear Visual Indication: Features a high-visibility white toggle switch for effortless manual control and immediate status recognition.
Enhanced Safety with Trip-Free Operation
Electrical safety in mobile and off-grid environments is paramount. This breaker features a fail-safe trip-free mechanism. If a short circuit or dangerous overload persists on the line, the breaker will trip open even if the white toggle handle is physically held in the "ON" position. This critical safety feature reduces the risk of wire insulation melting, equipment damage, and electrical fires caused by operators attempting to force a faulted circuit to stay live.
Versatile Applications for Marine, RV, and Off-Grid
Built to handle the rigours of mobile and marine power distribution, the C-Series double-pole breaker is a trusted component for professional installers and DIY builders alike. The heavy-duty rear stud terminals ensure cables remain tightly secured despite the constant vibrations experienced in 4WDs, caravans, and marine vessels.
Common applications include:
- AC Main Breakers: Isolating both active and neutral conductors simultaneously in shore power, inverter, or generator systems.
- High-Amperage DC Systems: Protecting and switching 50A loads such as windlasses, hydraulic pumps, bow thrusters, or sub-panels.
- Battery Bank and Solar Isolation: Providing reliable manual disconnection and overcurrent protection in 12V, 24V, or 48V off-grid battery setups.
Upgrade Your Electrical Distribution Panel
Protect your high-draw appliances and wiring infrastructure with professional-grade circuit management. Add the Blue Sea C-Series 50A Double-Pole Toggle Circuit Breaker to your system today for dependable, temperature-stable overcurrent protection.
SKU: BS-7251B
SPECIFICATIONS
| Specification | Value |
|---|---|
| Product type | Circuit breaker |
| SKU: | BS-7251B |
| Model #: | BS-7251B |
| MPN: | BS-7251B |
| Package weight: | 0.54 kg |
| Package length: | 0.11 m |
| Package width: | 0.09 m |
| Package height: | 0.14 m |
WARRANTY
Blue Sea Warranty Policy
Blue Sea Systems products sold by us are supplied with a warranty against defects for the warranty period shown below, subject to the product type, application and the terms of this warranty policy.
The express warranty provided by us is limited to a maximum of 5 years from the original date of purchase, unless otherwise required under Australian Consumer Law.
Blue Sea Systems may offer longer manufacturer support on some products at their discretion
Warranty Lengths by Product Range
| Blue Sea Product Range | Warranty Length | Application / Notes |
|---|---|---|
| Most Blue Sea Systems Products | 5 years | Applies to most Blue Sea Systems products found to be defective in materials or manufacture. |
| P12 Battery Chargers | 5 years | Warranty period starts from the original date of purchase. |
| P12 Remote Displays | 5 years | Warranty period starts from the original date of purchase. |
| Digital Meters | 3 years | Warranty period starts from the original date of purchase. |
| Vessel System Monitors | 3 years | Warranty period starts from the original date of purchase. |
Warranty Assessment and Remedy
If a Blue Sea Systems product is found to be defective in materials or manufacture within the applicable warranty period, we will, at our discretion, arrange a repair, replacement, store credit or refund, depending on the nature of the fault and the requirements of Australian Consumer Law.
Products may need to be returned for assessment before a warranty claim can be approved. Where required, the product must be returned with dated proof of purchase and a clear description of the fault.
Labour costs for removing, replacing, reinstalling or diagnosing a product are not covered by this express warranty unless otherwise required under Australian Consumer Law.
Making a Warranty Claim
To make a warranty claim, please contact us with your dated proof of purchase, product details and a description of the fault.
The product may need to be returned for inspection before the claim can be assessed. If the product is confirmed to be faulty and covered by this warranty, we will advise the available remedy.
What This Warranty Does Not Cover
This warranty does not cover faults or damage caused by incorrect installation, incorrect application, misuse, abuse, neglect, unauthorised modification, accidental damage, normal wear and tear, environmental damage, or failure to use the product in accordance with the manufacturer's instructions.
- Incorrect installation or wiring
- Incorrect product selection or application
- Misuse, abuse or neglect
- Physical or accidental damage
- Water ingress or environmental damage outside the product's intended use
- Unauthorised modification or repair
- Normal wear and tear
- Labour costs for removal, replacement, reinstallation or diagnosis
- Freight, travel or call-out costs unless otherwise required by law
- Products not returned for assessment when reasonably required
Manufacturer Support
Blue Sea Systems may provide additional manufacturer support on some products beyond the warranty period listed above. Where available, we may assist customers in contacting the manufacturer, but any manufacturer support beyond the express warranty period is subject to the manufacturer's own terms and continued availability.
Australian Consumer Law
This warranty is in addition to other rights and remedies available at law. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

