Blue Sea 50A Medium Duty Push Button Reset-Only Circuit Breaker
Blue Sea 50A Medium Duty Push Button Reset-Only Circuit Breaker
Weatherproof & Ignition Protected - Trip-Free Design with Lock Washers

DESCRIPTION
Reliable Weatherproof and Ignition-Protected 50A Overcurrent Protection
In demanding marine, automotive, and off-grid DC power systems, protecting your electrical cabling and equipment from overcurrent events is essential. The Blue Sea Systems Medium Duty 50A Push Button Circuit Breaker delivers dependable thermal circuit protection specifically engineered for applications where circuit switching is handled elsewhere, or where continuous 24-hour protection is required.
Unlike standard fuses that require replacement parts and tools when an overload occurs, this reset-only circuit breaker allows for rapid power restoration via a prominent manual push button. Its compact footprint enables high-density circuit protection configurations, making it an ideal solution for tight electrical cabinets, marine helm stations, 4WD dual-battery canopies, and caravan power distribution boards.
Engineered for Harsh Environments and Safety Compliance
Standard automotive circuit breakers often suffer from moisture ingress, terminal loosening under vibration, and corrosion when exposed to coastal or off-road conditions. The Blue Sea BS-2142B addresses these vulnerabilities with a fully weatherproof housing that shields internal components from water spray, dust, and salt mist.
Furthermore, this unit is ignition protected, meaning it is engineered to prevent internal sparks from igniting surrounding flammable gases. This makes it safe for installation aboard petrol-powered boats, within vehicle engine bays, or near vented battery compartments. For added safety, the internal trip-free mechanism ensures the breaker cannot be manually held in the closed (ON) position during an active fault-current condition, preventing severe wire overheating and equipment damage while you troubleshoot the underlying issue.
Key Features and Technical Advantages
- Reset-Only Operation: Prevents accidental manual switching off of critical 24-hour circuits such as bilge pumps, security systems, or battery chargers.
- Trip-Free Safety Mechanism: Automatically trips and remains open during an ongoing fault, even if the reset button is held down.
- Weatherproof Construction: Built to withstand exposure to moisture, spray, and harsh marine or off-road environments.
- Ignition Protected: Safe for installation in compartments housing petrol engines or flammable vapour sources.
- Captive Star Lock Washers: Integrated into the terminal studs to meet anti-rotation requirements, resist high-vibration loosening, and prevent dropped hardware during installation in tight spaces.
- Compact, High-Density Format: Reinforced mounting holes and a streamlined body allow multiple breakers to be mounted neatly in confined distribution panels.
Ideal Applications for 50A Reset-Only Protection
The 50A rating sits in a highly versatile middle ground for DC power systems. It is frequently utilised for main, branch, or dedicated circuit protection where separate switches or relays control the load. Common applications include:
- Marine Electrical Systems: Protecting heavy-duty bilge pumps, windlass control circuits, audio amplifiers, and sub-panel feed lines on boats and yachts.
- 4WD and Caravan Setups: Safeguarding DC-DC battery chargers, air compressors, hydraulic pumps, and auxiliary fuse block main feeds.
- Commercial and Industrial Vehicles: Providing vibration-resistant overcurrent protection for warning lights, communication gear, and auxiliary work equipment.
Upgrade Your DC Circuit Protection
Ensure your critical marine, RV, or automotive electrical circuits are safeguarded against overloads and short circuits. Add the Blue Sea Medium Duty 50A Push Button Circuit Breaker to your system today for durable, compliant, and easily resettable power protection.
SKU: BS-2142B
SPECIFICATIONS
| Specification | Value |
|---|---|
| Product type | Circuit breaker |
| SKU: | BS-2142B |
| Model #: | BS-2142B |
| MPN: | BS-2142B |
| Package weight: | 0.18 kg |
| Package length: | 0.1 m |
| Package width: | 0.08 m |
| Package height: | 0.08 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.

