MITSUBISHI NF50-CP Pole Fuse Circuit Breaker 50A 600V 3-POLE 130A145PR2

( Brand: Mitsubishi ), ( Manufacturer Part Number: NF50-CP ), ( Part Type: Fuse Circuit Breaker ), ( Country Of Origin: Japan )

Review MITSUBISHI 50a 600v Pole No fuse Circuit Breaker #130a145pr2

The **Mitsubishi Electric NF50-CP 50A 600V Pole No-Fuse Circuit Breaker (Model 130A145PR2)** is a high-performance, compact-molded case circuit breaker (MCB) designed to provide reliable protection for electrical circuits in industrial, commercial, and residential applications. Part of Mitsubishi s advanced NF series, this breaker combines precision engineering with robust functionality to ensure optimal safety and operational efficiency in demanding environments. With a rated current of **50 amps** and a voltage rating of **600 volts**, it is engineered to handle medium to high-power loads while maintaining exceptional thermal and magnetic trip characteristics for superior fault detection. The **no-fuse variant** eliminates the need for additional fuse protection, simplifying installation and reducing maintenance requirements while still delivering fast, accurate interruption of overcurrents and short circuits. Its **compact design** allows for efficient panel integration, making it ideal for applications where space is limited without compromising performance. The breaker features a **magnetic trip mechanism** for instantaneous protection against short circuits and a **thermal trip mechanism** for gradual overload protection, ensuring both immediate and sustained fault clearance. Built with high-quality materials, the NF50-CP is resistant to environmental stressors such as moisture, dust, and temperature fluctuations, making it suitable for both indoor and outdoor installations in controlled or harsh conditions. The **PR2 designation** indicates a specific trip characteristic curve, optimized for applications requiring balanced protection against both short circuits and prolonged overloads, such as motor circuits, lighting systems, and general-purpose power distribution. With its **durable mechanical construction**, the breaker offers a long operational lifespan with minimal wear, ensuring consistent reliability over extended periods. Additionally, its **modular design** allows for easy retrofitting into existing electrical panels, reducing downtime and installation complexity. Whether used in industrial machinery, commercial buildings, or residential wiring, the Mitsubishi NF50-CP 50A 600V no-fuse circuit breaker delivers a perfect blend of performance, safety, and convenience, making it a trusted choice for electrical professionals seeking dependable circuit protection.

The **Mitsubishi NF50-CP 50A 600V Pole No-Fuse Circuit Breaker (130A145PR2)** is a specialized circuit breaker designed for industrial and commercial applications, particularly in motor control and high-power circuits. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High Current Rating and Motor Protection**

The 50A rating (with a 130A magnetic trip setting) makes this breaker suitable for protecting motors, transformers, and other high-inrush current loads. The adjustable trip curve (PR2 curve) allows for fine-tuning to match motor starting characteristics, reducing nuisance tripping during startup.

2. **No-Fuse Design**

Unlike traditional fuses, this circuit breaker can be reset after tripping, making it more cost-effective and convenient for applications where frequent overloads or short circuits may occur. It eliminates the need for replacement fuses, reducing downtime.

3. **Compact and Space-Efficient**

The NF50 series is designed for modular applications, fitting into standard electrical panels (e.g., NEMA or IEC enclosures). This is beneficial for installations where space is limited.

4. **Thermal and Magnetic Protection**

The breaker combines thermal protection (for sustained overloads) and magnetic protection (for short circuits), providing comprehensive fault protection. The PR2 curve is optimized for motor loads, offering a balance between sensitivity and tolerance for inrush currents.

5. **Compatibility with Mitsubishi s E-Series and Other Systems**

This breaker is part of Mitsubishi s NF series, which is widely used in industrial automation, HVAC systems, and motor control applications. It integrates well with Mitsubishi s E-Series contactors, starters, and PLCs, making it ideal for existing Mitsubishi-based systems.

6. **Long Lifespan and Reliability**

Mitsubishi is known for durable electrical components, and this breaker is built to withstand frequent cycling (e.g., in motor control applications) without degrading performance. It typically has a long operational lifespan with proper maintenance.

7. **Easy Installation and Maintenance**

The breaker is designed for quick installation in standard panel configurations. Resetting after a trip is straightforward, and it does not require specialized tools for basic operation.

8. **Wide Voltage Rating (600V)**

The 600V rating makes it suitable for medium-voltage industrial applications, including three-phase systems commonly found in factories, data centers, or large commercial buildings.

9. **Low Operating Cost**

Since it is a resettable breaker, the long-term cost of ownership is lower compared to fuse-based systems, which require frequent replacements.

10. **Compliance with Standards**

Mitsubishi products generally comply with international safety standards (e.g., UL, IEC, CSA), ensuring reliability and legal compliance in most markets.

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### **Cons**

1. **Limited to Specific Applications**

While excellent for motor control and high-inrush loads, this breaker may not be ideal for general-purpose residential or light commercial applications where lower current ratings (e.g., 15A 30A) are more common. It is overkill for non-industrial uses.

2. **Adjustable Trip Setting Requires Knowledge**

The PR2 curve and adjustable trip setting (130A magnetic trip) require understanding of motor load characteristics. Improper adjustment can lead to either frequent tripping (if set too low) or inadequate protection (if set too high). This may necessitate consultation with an electrician or engineer.

3. **Higher Upfront Cost**

Compared to standard fuses or lower-end circuit breakers, this breaker is more expensive. The cost may not be justified for applications where simpler protection is sufficient.

4. **Not Suitable for All Panel Configurations**

While it fits standard modular panels, compatibility depends on the specific enclosure and wiring setup. Some older or non-standard panels may require additional adapters or modifications.

5. **Potential for False Tripping in Non-Motor Loads**

The PR2 curve is optimized for motor loads, which have high inrush currents. Using it for non-motor loads (e.g., lighting or heating) without proper adjustment could lead to unnecessary tripping due to the breaker s sensitivity to inrush.

6. **Replacement Parts Availability**

While Mitsubishi is a reputable brand, replacement breakers or parts may be harder to source in remote or less industrialized regions compared to more universally available components like GE or Siemens breakers.

7. **Physical Size Constraints**

The 50-pole configuration is larger than smaller breakers (e.g., 1-pole or 2-pole). In very compact panels, this may limit installation flexibility.

8. **Requires Proper Wiring and Grounding**

Like all high-current breakers, improper wiring or grounding can lead to malfunction or safety hazards. This breaker demands careful installation to avoid issues like arcing or overheating.

9. **Limited to Mitsubishi Ecosystem**

While it integrates well with Mitsubishi systems, it may not be as easily compatible with non-Mitsubishi contactors or control panels without additional components or modifications.

10. **Potential for Overload in Non-Adjusted Use**

The 130A magnetic trip setting is high, which may not be suitable for all motors or loads. If used without adjusting the trip curve or for loads below 50A, the breaker may not provide adequate protection, leading to overheating or equipment damage.

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### **Conclusion**

The **Mitsubishi NF50-CP 50A 600V Pole No-Fuse Circuit Breaker (130A145PR2)** is a robust, high-performance breaker tailored for industrial motor control and high-power applications. Its adjustable trip curve, resettable design, and compatibility with Mitsubishi systems make it a strong choice for factories, HVAC systems, and other environments with demanding electrical loads. However, its complexity, higher cost, and specificity to motor loads mean it is not suitable for general-purpose or non-industrial uses. It is best suited for professionals or facilities with existing Mitsubishi infrastructure and a need for precise motor protection.

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### **Recommendation**

- You are working with **Mitsubishi E-Series contactors, motor starters, or PLCs** in an industrial or commercial setting.

- Your application involves **high-inrush current loads (e.g., motors, transformers, compressors)** where a PR2 curve is beneficial.

- You require a **resettable, modular breaker** that can handle frequent cycling without fuse replacements.

- You have the **technical knowledge or support** to properly adjust the trip setting for your specific load.

- You need a **general-purpose breaker** for residential, light commercial, or non-motor loads.

- Your budget is tight, as the upfront cost is higher than standard breakers or fuses.

- You lack experience with **adjustable trip curves** or motor protection settings.

- Your panel setup is **non-standard** and may not accommodate the 50-pole configuration easily.

- You prefer **universally available breakers** (e.g., from GE, Siemens, or Square D) with broader compatibility.

- For **simpler motor protection**, a **standard 50A motor circuit protector (MCP)** with a built-in PR curve (e.g., from Square D or Siemens) may suffice.

- For **non-motor loads**, a **standard 50A thermal-magnetic breaker** (e.g., 1-pole or 3-pole) would be more appropriate.

- If working with **non-Mitsubishi systems**, verify compatibility with your existing contactors or starters before purchasing.

In summary, this breaker is a **specialized, high-quality industrial component** best suited for experienced users in the right application. For most other cases, a more general-purpose breaker would be a better fit.

Details:

part #: nf50 prices

• $19.99-$123.48

specifications automationjack:

• brand: Mitsubishi
• mpn: Nf50-cp
• part type: Fuse Circuit Breaker
• country of origin: Japan

seller automationjack:

• # reviews: 21531
• city: Scottsburg, Indiana
• rating: 99.9%

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• class: Standard
• service: Standard
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• type: Fixed

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general automationjack:

• Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment
• condition: Used

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offer automationjack:

• quantity: 1
• sold: 0
• availability: In Stock
• started: May 23, 2026
• options: Ship-to-home

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