Mitsubishi WS NF400-HEW-MDU Instruction Manual

Mitsubishi WS NF400-HEW-MDU Breaker manual cover

Pages 34

Year 2021

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of 34

Mitsubishi WS NF400-HEW-MDU Breaker Specification

The Mitsubishi WS NF400-HEW-MDU Breaker is a compact and efficient circuit breaker designed for high-performance electrical systems. It is engineered to accommodate a wide range of applications in both commercial and industrial settings. This breaker features a rated current of up to 400 Amperes, making it suitable for medium to high-load circuits. Its interrupting capacity is optimized to ensure reliable protection against overloads and short circuits, enhancing safety and operational continuity.

The WS NF400-HEW-MDU is equipped with advanced electronic trip units that offer precise measurement and monitoring capabilities. These units support adjustable settings for long-time, short-time, and instantaneous trip functions, allowing for customizable protection parameters to suit specific system requirements. The breaker is designed with a compact form factor, facilitating ease of installation in space-constrained environments while maintaining robust performance.

In terms of construction, the WS NF400-HEW-MDU utilizes high-quality materials to ensure durability and longevity under demanding conditions. Its design complies with international standards, ensuring compatibility and reliability across various electrical systems. The breaker is also engineered with user-friendly features such as clear status indicators and accessible connection points, simplifying maintenance and operation tasks.

Overall, the Mitsubishi WS NF400-HEW-MDU Breaker combines advanced technological features with practical design elements to deliver efficient performance and reliable protection in diverse electrical applications. Its adaptability and robust construction make it a versatile choice for ensuring safety and efficiency in electrical systems.

Mitsubishi WS NF400-HEW-MDU Breaker F.A.Q.

How do I properly install the Mitsubishi WS NF400-HEW-MDU Breaker?

To install the Mitsubishi WS NF400-HEW-MDU Breaker, ensure that the breaker is correctly rated for your system. Secure it on the mounting plate, connect the power leads to the input and output terminals, and tighten the screws to the manufacturer's specified torque. Verify all connections are correct before powering on.

What steps should I follow for routine maintenance of the breaker?

Routine maintenance includes visual inspections for signs of wear or damage, checking the tightness of all connections, and testing the breaker operation by performing a trip test. Ensure the breaker is cleaned of dust and debris regularly.

How can I troubleshoot a breaker that frequently trips?

If the breaker frequently trips, check for overloaded circuits, faulty wiring, or a malfunctioning breaker. Verify that the load does not exceed the breaker's rated capacity. If issues persist, consult a professional electrician to inspect the system.

What are the safety precautions to take when handling this breaker?

Always turn off the power supply before performing any maintenance or installation. Use insulated tools and wear protective equipment. Follow all local electrical codes and guidelines to ensure a safe working environment.

Can the Mitsubishi WS NF400-HEW-MDU Breaker be used for both AC and DC applications?

The Mitsubishi WS NF400-HEW-MDU Breaker is designed primarily for AC applications. Refer to the manufacturer's specifications to confirm compatibility with DC applications.

How do I reset the breaker after a trip?

To reset the breaker, first ensure the cause of the trip is resolved. Move the breaker handle to the "OFF" position, then back to the "ON" position. If it does not reset, check for underlying issues or consult a professional.

What should I do if the breaker won't stay in the ON position?

If the breaker won't stay in the ON position, it may indicate a persistent fault or overload. Inspect the connected devices and wiring. If the problem persists, the breaker may be faulty and require replacement.

How often should the breaker be tested for functionality?

It is recommended to test the breaker's functionality at least annually or as per the manufacturer's maintenance schedule. More frequent testing may be necessary in critical applications.

What indications suggest that a breaker needs replacement?

Signs that a breaker may need replacement include visible damage, burning smell, frequent tripping at normal loads, or inability to reset. Inspect and replace as necessary to maintain system safety.

Are there any environmental conditions that can affect breaker performance?

Extreme temperatures, high humidity, dust, and corrosive environments can affect breaker performance. Ensure the breaker is installed in a suitable environment or use protective enclosures if necessary.