Circuit breaker series 187 - Panel mount 70 A

A BLUE SEA 187 series circuit breaker is an electrical protection device designed for marine applications. Specifically, it is a thermal circuit breaker, meaning it detects overcurrents caused by excessive circuit heating. This model is designed for flush-panel mounting, providing a clean and integrated finish.

The primary function of this circuit breaker is to protect electrical circuits and connected equipment from damage caused by overcurrents or short circuits. In the event of excessive current, it automatically interrupts the circuit to prevent cable overheating and equipment failure. Its 70-ampere capacity makes it suitable for high-load applications.

Yes, the BLUE SEA 187 series circuit breaker is specifically designed to withstand the harsh conditions of a marine environment. It is typically made from corrosion-resistant materials and is often protected against water spray and ignition, making it safe and reliable aboard boats.

The nominal current rating of this specific model is 70 amperes (70 A). This means it is designed to operate continuously with a current up to 70 amperes without tripping, and will trip to protect the circuit if the current exceeds this value for a given period.

This circuit breaker is a manual reset model. After tripping due to an overcurrent, simply press the reset button or lever to return it to the 'ON' position once the cause of the overcurrent has been identified and corrected.

The 'trip-free' feature (or 'trip-free mechanism') means that the circuit breaker cannot be manually held closed if an overload or short-circuit condition persists in the circuit. Even if the operator attempts to keep it in the 'ON' position, it will trip automatically to ensure circuit protection, which is an essential safety feature.

The advantages of a thermal circuit breaker over a fuse include the ability to manually reset, avoiding the need to replace a blown fuse. It also provides more gradual protection against overloads by tripping based on the intensity and duration of the overload, and can function as a switch.

Yes, BLUE SEA 187 series circuit breakers are typically certified «ignition protected» per SAE J1171. This feature is critical for marine applications as it ensures the breaker will not produce sparks or electrical arcs that could ignite fuel vapors in engine compartments.

This circuit breaker is made with robust, corrosion-resistant materials suitable for marine environments. The housing is typically made of thermosetting plastic, and the terminals are often made of tinned copper to ensure excellent conductivity and resistance to oxidation.

This circuit breaker is designed for panel mounting. This means it is recessed into a cutout made in a dashboard or distribution panel, with the front face of the circuit breaker flush with the panel surface.

Installation on a panel is relatively simple for an electrician or a skilled DIYer. It involves making a precise cut in the panel, securing the circuit breaker with screws or a clamping system, then connecting the cables to the appropriate terminals. Detailed instructions are usually provided with the product.

For a 70 A circuit breaker, the cable diameter must be selected based on maximum current, cable length, and allowable voltage drop. It is essential to consult marine electrical standards (such as ABYC standards in the United States or ISO/IEC in Europe) to choose the appropriate cable cross-section to prevent overheating and energy losses. An undersized cable section could lead to excessive heating and a fire risk.

In general, a circuit breaker is a primary protection device and does not require an upstream fuse for the same overcurrent protection function. However, in some complex systems or for specific applications, a main fuse or a higher-capacity circuit breaker may be used upstream to protect the entire circuit or the main wiring leading to the distribution panel.

Turn off the system's electrical power.Choose a suitable location on the panel.Cut the panel according to the dimensions specified by the manufacturer.Insert the circuit breaker into the cutout and secure it firmly.Connect the power and load cables to the circuit breaker terminals, respecting polarity.Check all connections and restore power to test operation.It is always recommended to follow the manufacturer's specific instructions.

This 70 A circuit breaker is ideal for protecting circuits requiring high current in a marine environment. It can be used for equipment such as power inverters, electric windlasses, bow thrusters, high-flow bilge pumps, refrigeration systems, or main distribution circuits for heavy loads.

This Blue Sea Systems circuit breaker is covered by the manufacturer's warranty, which provides protection against material and manufacturing defects. Blue Sea Systems is a reputable manufacturer known for the quality of its products. The exact duration and conditions of this warranty are set by the manufacturer and comply with common industry practices for marine electrical equipment.