Mitsubishi NF125-HEV Instruction Manual

Mitsubishi NF125-HEV Breaker manual cover
Pages 23
Year 2015
Language(s)
English en

Mitsubishi NF125-HEV Breaker Specification

The Mitsubishi NF125-HEV Breaker is a high-performance electrical circuit breaker designed for advanced circuit protection in various industrial and commercial applications. This breaker is part of Mitsubishi's renowned NF series, known for reliability and robust design. It is engineered to handle a rated current of up to 125 Amperes, making it suitable for medium-scale electrical systems. The NF125-HEV features a highly efficient interrupting capacity, ensuring dependable operation by safely interrupting current flow during overloads or short circuits.

This breaker employs a three-pole configuration, enhancing its versatility across different electrical setups and providing comprehensive protection. Its advanced arc extinguishing technology reduces the risk of electrical fires and equipment damage by swiftly quenching electrical arcs. The NF125-HEV is equipped with thermal-magnetic trip units, which combine thermal protection for overload conditions with magnetic protection for short-circuit scenarios, ensuring prompt and reliable response to electrical faults.

Designed for ease of installation and maintenance, the NF125-HEV has a compact form factor, allowing seamless integration into existing electrical panels. The breaker’s ergonomic design and user-friendly interface provide straightforward operation and accessibility, while its durable construction ensures longevity and consistent performance in demanding environments. Compliance with international safety standards underscores its suitability for global applications. Additionally, it supports optional accessories and features, such as auxiliary contacts and shunt trips, enhancing its functionality and adaptability to specific requirements. Overall, the Mitsubishi NF125-HEV Breaker combines advanced technology with practical design, offering a reliable solution for protecting vital electrical systems.

Mitsubishi NF125-HEV Breaker F.A.Q.

How do I install the Mitsubishi NF125-HEV Breaker?

To install the Mitsubishi NF125-HEV Breaker, first ensure that the power supply is disconnected. Mount the breaker onto the designated panel using the provided screws and ensure it is securely fastened. Connect the input and output wires to the corresponding terminals, following the wiring diagram provided in the manual. Finally, tighten all connections and check for any loose ends before powering on the system.

What should I do if the breaker trips frequently?

If the breaker trips frequently, check for any overload conditions by inspecting the connected circuit. Ensure that the total current does not exceed the breaker's rated capacity of 125A. If the load is within limits, inspect for short circuits or faulty equipment downstream. Reset the breaker after resolving any issues. If the problem persists, consult a professional electrician.

How do I perform routine maintenance on the NF125-HEV Breaker?

Routine maintenance of the NF125-HEV Breaker includes visual inspections for signs of wear or damage, checking for loose connections, and ensuring that the breaker operates smoothly. Regularly clean the breaker and its surrounding area to prevent dust accumulation. Test the breaker's functionality by manually tripping and resetting it.

Can the NF125-HEV Breaker be used in outdoor applications?

The NF125-HEV Breaker is designed for indoor use and should be installed in a controlled environment to protect it from moisture, dust, and extreme temperatures. If outdoor installation is necessary, ensure it is housed in a suitable NEMA-rated enclosure to provide adequate protection.

What are the typical signs of a failing NF125-HEV Breaker?

Signs of a failing NF125-HEV Breaker include frequent tripping without apparent cause, visible damage such as burns or cracks, unusual noises during operation, and difficulty in resetting. If any of these signs are observed, it is recommended to replace the breaker or consult a professional for further inspection.

How can I test the functionality of my Mitsubishi NF125-HEV Breaker?

To test the functionality of the NF125-HEV Breaker, perform a manual trip test by using the test button, if available. Ensure the breaker trips and resets correctly. Additionally, a multimeter can be used to verify continuity and check for any irregular resistance levels when the breaker is closed.

What is the correct procedure to reset a tripped NF125-HEV Breaker?

To reset a tripped NF125-HEV Breaker, first switch the breaker to the "off" position to ensure it is fully disengaged. Then, move the breaker handle firmly to the "on" position. If the breaker does not reset, there may be an ongoing issue with the connected circuit that needs addressing.

Is it possible to upgrade the NF125-HEV Breaker for higher current capacity?

The NF125-HEV Breaker is designed for a specific current rating of 125A and cannot be upgraded for higher current capacity. For applications requiring higher capacity, a different breaker model with the appropriate rating must be selected to ensure safety and compliance.

How do I know if the NF125-HEV Breaker is compatible with my electrical system?

To determine compatibility, check the breaker's voltage and current ratings against your system's requirements. Ensure that the breaker's interrupting capacity meets or exceeds the potential fault current of the system. Consulting the electrical system's specifications or a professional can help confirm compatibility.

What safety precautions should I take when working with the NF125-HEV Breaker?

When working with the NF125-HEV Breaker, always disconnect the power supply before performing any work. Use insulated tools and wear appropriate personal protective equipment (PPE), such as gloves and safety glasses. Be aware of the breaker’s specifications and handle it according to the manufacturer’s guidelines to prevent accidents.