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Blue Sea 50A 187-Series Panel Mount Thermal Circuit Breaker
Blue Sea 50A 187-Series Panel Mount Thermal Circuit Breaker
Ignition Protected & Weatherproof - 5/16" (M8) Studs - Trip-Free
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$167.82
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DESCRIPTION
Heavy-Duty Switching and Overcurrent Protection for Marine and Off-Grid DC Systems
Managing moderate-to-high-current DC loads requires reliable hardware that can endure harsh, vibration-prone environments. The Blue Sea 187-Series 50A Thermal Circuit Breaker delivers dual-purpose functionality by combining manual circuit switching and precise thermal overcurrent protection into a single, robust unit. Engineered specifically for flush panel mounting, this component streamlines electrical distribution boards on marine vessels, 4WD dual-battery setups, caravans, and industrial off-grid systems by eliminating the need to wire separate isolation switches and fuse holders.
Engineered for Safety: Ignition Protection and Trip-Free Design
When working with enclosed battery compartments or engine bays, safety is paramount. This 187-Series breaker is fully ignition protected, meaning it is sealed to prevent internal electrical arcs from igniting external flammable vapours. This makes it compliant and safe for installation aboard petrol-powered boats and near ventilated battery enclosures.
In addition to its weatherproof housing, the breaker incorporates a trip-free internal mechanism. Unlike standard consumer-grade switches, a trip-free design ensures that the internal contacts cannot be manually held closed while an active fault current is present. If a short circuit or continuous overload occurs, the breaker will trip and remain disconnected until the fault is cleared, reducing the risk of cable overheating, insulation melt, or electrical fires. The large, high-visibility yellow reset lever provides an immediate visual indication of the circuit status and allows for straightforward manual operation even in dimly lit lockers.
Key Features and Technical Benefits
- Dual-Function Operation: Combines heavy-duty manual ON/OFF switching and automatic thermal circuit protection in one compact device.
- Ignition Protected Construction: Safe for installation in marine engine rooms, bilge areas, and compartments aboard petrol-powered vessels.
- Trip-Free Safety Mechanism: Prevents the user from forcing the circuit ON during an active overcurrent fault condition.
- Robust Terminal Hardware: Equipped with heavy-duty 5/16" (Approx. M8) stud terminals designed to support high-torque connections and accept large-gauge cable lugs.
- Weatherproof Housing: Sealed against moisture and salt spray ingress to ensure long-term reliability in coastal and mobile environments.
- Clear Visual Indication: Features a prominent yellow lever that clearly displays tripped or disconnected status at a glance.
Why Upgrade Over Standard Breakers?
Many entry-level thermal breakers suffer from undersized terminal studs, high internal resistance, and brittle housings that fail under thermal cycling or mechanical vibration. The Blue Sea 187-Series solves these common failure points by utilising marine-grade materials and substantial 5/16" (Approx. M8) terminal studs. These larger studs allow you to apply proper fastening torque without stripping threads, ensuring a low-resistance electrical connection that avoids voltage drop and localised heat build-up.
Application Guidelines and Exclusions
This 50A panel mount circuit breaker is well suited for protecting main DC feed wires, medium-duty winches, windlasses, DC-DC chargers, and sub-panel distribution feeds. To ensure optimal longevity of the internal contacts, do not use this breaker as a manual switch where high inrush currents are expected. It is designed to protect the wiring harness and act as a service disconnect rather than a continuous-duty load switch for high-surge inductive motors.
Secure Your Electrical Distribution
Equip your marine switchboard, camper trailer, or custom 12V/24V control panel with dependable overcurrent protection. Select the Blue Sea 187-Series 50A Panel Mount Circuit Breaker for a clean, compliant, and durable electrical installation.
SKU: BS-7039B
SPECIFICATIONS
| Specification | Value |
|---|---|
| Product type | Circuit breaker |
| Mounting / form factor | Panel mount |
| Ignition Protected | Yes |
| Terminal Size | 5/16 (M8) |
| SKU: | BS-7039B |
| Model #: | BS-7039B |
| MPN: | BS-7039B |
| Package weight: | 0.42 kg |
| Package length: | 0.12 m |
| Package width: | 0.1 m |
| Package height: | 0.1 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.
DOCUMENTS
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