Thermal circuit-breaker with Led indicator - Reset button - Baywatt - Marine-grade IP66 with stainless steel studs

Disjoncteur thermique marin à voyant LED et réarmement manuel, montage en surface. Disponible en 60A à 300A pour systèmes 12-48V. Protection IP66 pour bateaux et véhicules.

Circuit breaker with LED reset indicator - surface mount. 12/48V 60 to 300A continuous rating

Thermal Circuit Breaker 60A-300A with LED | Surface Mount

SKU: CBL60

$24.00 USD; $24.00 USD
Unit price: per

Rated Current: 60A 60A 120A 200A 250A 300A

Product variants

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Description
Specification
How to use
FAQ
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BAYWATT — Marine DC Thermal Circuit Breaker

BAYWATT
60A–300A
12V–48V DC by Rating
Manual Reset + LED
IP66 Waterproof
See Specs ↓

Protect high-current 12V, 24V and 48V DC circuits with a resettable marine thermal circuit breaker. Designed for battery banks, inverters, windlasses, anchor winches, bow thrusters and main DC distribution, it automatically opens the circuit in the event of a sustained overload or short circuit.

Available from 60A to 300A, this surface-mount DC breaker is a practical, reusable alternative to a high-current fuse. The illuminated reset button makes a tripped circuit easy to identify, then restores power manually once the cause has been corrected.

Purpose-built protection for high-power DC circuits. Use it as a battery circuit breaker, inverter circuit breaker, windlass circuit breaker or main DC overload protection.

Automatic thermal trip with manual reset
LED illuminates when the breaker has tripped
IP66 enclosure for exposed marine environments
Stainless-steel connection studs: M6 or M10 depending on rating
Ignition protected to ISO 8846 for suitable petrol-engine compartments

Useful sizing rule: where the equipment manufacturer does not prescribe a breaker, choosing a rating approximately 25–30% above the known continuous load is generally suitable. It allows normal running current and brief motor or inverter surges without compromising correct cable protection—provided the selected rating remains within the safe ampacity of the cable and the breaker is rated for the system voltage.

Built for Marine Battery, Inverter & Winch Circuits

Automatic DC Overcurrent Protection A thermal trip disconnects the circuit during sustained overloads, helping protect the positive cable, battery bank and connected equipment.

Clear LED Fault Indication When the breaker trips, its LED indicates the open circuit. The push-button reset makes fault finding and restoration straightforward.

Marine-Grade Construction IP66 protection, corrosion-resistant studs and an operating range from −32°C to +82°C suit battery lockers, engine spaces and exposed onboard installations.

Choose the Correct Circuit Breaker Rating

60A / 120A

12V, 24V or 48V DC systems
DC distribution feeds
Small and medium inverter inputs
Charging and auxiliary battery circuits
Equipment with a manufacturer-recommended rating in this range

200A

12V or 24V DC systems
High-current inverter supply
24V anchor winch or windlass circuits
House-battery main feeds
High-output charging circuits

250A / 300A

12V DC systems only
Heavy-duty windlasses and anchor winches
12V bow thrusters
Large 12V inverter inputs
Main 12V battery protection

Application examples are a starting point only. Always check the maximum current specified by the equipment manufacturer, cable cross-section and installation conditions before selecting the breaker.

How to Select & Install a DC Circuit Breaker

Check the maximum system voltage. Select 60A or 120A for 48V systems; use ratings up to 200A at 24V, or up to 300A at 12V.
Identify the actual continuous load. Use the equipment data sheet or measure the normal current under load. Consider permitted startup surge for motors and inverters.
Select the breaker rating. Follow the manufacturer's specified protection rating. If none is given, a rating around 25–30% above the expected continuous load is normally appropriate.
Protect the cable first. The selected breaker must never exceed the safe current rating of the smallest conductor it protects.
Install on the positive supply conductor. Position the breaker as close as practical to the battery or other power source, keeping the unprotected cable length short.
Use correct cable lugs and torque. Use marine-grade tinned-copper lugs, heat-shrink protection and the specified stud torque. Check connections periodically for heat, corrosion and looseness.

Important: Do not increase the breaker size simply because it trips. A repeated trip can indicate an overload, incorrect cable sizing, a loose connection, excessive motor load, an inverter fault or a short circuit. Isolate the battery and diagnose the cause before resetting the system.

Essential DC Protection for Onboard Power

High-current DC systems can deliver enough energy to overheat cable insulation, damage battery equipment or cause fire within seconds. A correctly selected marine DC circuit breaker protects the conductor and provides a local, resettable isolation point for service and fault diagnosis.

Battery banks: main positive-cable protection for lithium, AGM and lead-acid batteries.
Inverters: DC input protection between the battery bank and a 12V, 24V or 48V inverter.
Windlasses and winches: overload protection for anchor winches and other high-current DC motors.
Bow thrusters: suitable high-current protection for correctly rated 12V or 24V installations.
DC distribution: protection for switch panels, charging equipment and high-power auxiliary feeds.

Frequently Asked Questions

Can I use this breaker for a windlass or anchor winch?

Yes, provided the breaker rating, system voltage and cable size are correct for the windlass. Check the manufacturer's recommended circuit protection first. The 250A and 300A versions are for 12V systems only.

Can I use it between a battery and an inverter?

Yes. It is designed for high-current DC battery-to-inverter protection, as long as the breaker is selected according to the inverter's maximum DC input current, the cable rating and the system voltage.

Is 30% oversizing acceptable?

For an accurately known continuous load, allowing approximately 25–30% headroom is normally acceptable and helps avoid unnecessary trips from brief permitted surges. The breaker must still be below the protected cable's safe current rating and must not override a manufacturer-specified value.

Why has the LED come on?

The LED indicates that the thermal circuit breaker has tripped and the circuit is open. Correct the cause of the overload or fault before manually resetting it.

Can I use a 300A breaker in a 48V system?

No. At 48V, use only the 60A or 120A versions. The 200A version is suitable up to 24V, while 250A and 300A versions are suitable for 12V systems only.

View Specifications Review Installation

Need help choosing a battery, inverter or windlass circuit breaker? BAYWATT support can help you identify the appropriate rating.

Specification

Marine DC Thermal Circuit Breaker — Technical Specifications

BAYWATT
CBL60 to CBL300
Surface Mount
IP66
Rating Guide ↓

Specification	CBL60	CBL120	CBL200	CBL250	CBL300
Current rating	60A	120A	200A	250A	300A
Maximum system voltage	12V / 24V / 48V DC	12V / 24V / 48V DC	12V / 24V DC	12V DC	12V DC
Connection stud	M6	M6	M10	M10	M10
Weight	69 g	69 g	103 g	103 g	103 g

Type	Single-pole thermal DC circuit breaker, manual reset, class T3
Mounting	Surface mount
Terminal torque	11.3 Nm (M6 versions) / 17 Nm (M10 versions)
Interrupting capacity	3.5 kA at 48V DC / 5 kA at 18V DC
Operating temperature	−32°C to +82°C
Protection rating	IP66
Ignition protection	ISO 8846
Dimensions	74 × 48.4 × 46 mm
Stud centre distance	57 mm
Warranty	1 year

Voltage & Amperage Selection Overview

System voltage	Available breaker ratings	Typical high-current DC applications
12V DC	60A, 120A, 200A, 250A, 300A	Battery banks, inverters, windlasses, anchor winches, bow thrusters and main distribution
24V DC	60A, 120A, 200A	Inverters, battery banks, 24V windlass circuits and high-power DC distribution
48V DC	60A, 120A	48V battery systems, inverter inputs, charging circuits and auxiliary distribution

Selection reminder: breaker choice depends on actual continuous current, permitted surge, conductor ampacity, cable length, ambient temperature, system voltage and the equipment manufacturer's instructions. The breaker protects the cable as well as the connected equipment.

Safety warning: A battery bank can deliver extremely high fault current. Before installing, servicing or resetting a high-current DC circuit, isolate the battery and all charging sources. If you are unsure about the installation, use a qualified marine electrician.

Installation Guidelines

For selection help, contact BAYWATT with your system voltage, equipment current and cable cross-section.

How to use

How to use :

Discover tips, tricks, and detailed instructions on using our product in our dedicated blog post. Learn about setup, operation, and optimization to get the most out of your purchase.

Link to the blog

FAQ

Frequently Asked Question

What's the difference between a Thermal Breaker and a Differential Breaker?

Thermal Breaker: This device protects your electrical equipment from damage caused by overloads and short circuits. It operates by sensing excessive heat generated by high current flow and automatically trips to open the circuit.
Differential Breaker (RCD): An RCD is a critical safety device that protects people from electric shock and prevents fires caused by current leakage. It works by detecting an imbalance in current and is typically used in AC (alternating current) systems.

How do I choose the correct size for my thermal breaker?

To choose the correct thermal breaker size, you need to determine the maximum continuous amperage of the electrical device you want to protect. The breaker's amperage rating should be slightly higher than the device's normal operating current to prevent nuisance tripping, but low enough to protect the circuit from damage.

Key Principle: The thermal breaker should be sized to protect the weakest link in the circuit, which is usually the smallest gauge wire.

Recommendation: A good rule of thumb is to choose a breaker that is about 15-20% larger than the expected continuous current draw of the device.

How to Test a Thermal Breaker?

To check if your thermal breaker is working correctly, you can use the built-in features of your model.

Check the LED: Your thermal breaker is equipped with an integrated LED. When the breaker is triggered due to an overload or short circuit, the LED will light up, visually confirming that the circuit is open. If the breaker trips and the LED does not light up, this indicates a power issue on the input side of the breaker.
Verify Power Supply: If the LED does not light up after a trip, check your battery switch to ensure it is on and verify that the battery is properly connected to the breaker's input. The breaker requires power to illuminate the LED, so an unlit LED can be a simple diagnostic for power loss.

How to Install Thermal Breaker?

A thermal breaker should always be installed on the positive (+) signal of the circuit you want to protect. The most effective placement is as close as possible to the power source (e.g., the battery) to safeguard the entire length of the cable running to the device.

For example:

For an Inverter: Place the breaker on the positive cable directly before the inverter's input terminal.
For a Windlass: If the cable runs across the boat, install the breaker close to the battery to protect the entire cable run from any potential fault.

Why is the "Ignition Protected" feature important for a boat?

The Ignition Protect ISO 8846 certification is a crucial safety standard for any electrical component installed in an enclosed space where gasoline vapors might be present, such as an engine compartment. This certification guarantees that the product will not generate a spark or heat that could ignite flammable gases, thus significantly reducing the risk of fire or explosion on board.

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