CUTLER HAMMER CN55KN3A Eaton

( Brand: Cutler Hammer ), ( Manufacturer Part Number: CN55KN3A )

Review CUTLER HAMMER Eaton Corporation Used

The **Cutler-Hammer CN55KN3A** is a robust, medium-voltage motor control center designed for demanding industrial applications, offering unmatched reliability, flexibility, and safety in electrical distribution systems. Part of Eaton s renowned **Power Xpert** lineup, this compact yet powerful motor control center is engineered to control, protect, and monitor three-phase AC motors in a wide range of industrial environments, including manufacturing plants, mining operations, water treatment facilities, and commercial buildings. With a **55 kA (symmetrical) short-circuit withstand rating**, the CN55KN3A is built to endure extreme electrical faults, ensuring continuous operation even under severe stress conditions. Its **knockdown (KN) construction** allows for easy installation in tight spaces, while the **drawout design** enables quick maintenance without disrupting power flow, minimizing downtime and enhancing operational efficiency.

This motor control center features a **modular architecture**, accommodating a variety of Eaton s **Power Xpert** circuit breakers, contactors, and auxiliary relays, which can be configured to suit specific motor control requirements, such as soft-starting, variable frequency drive (VFD) compatibility, or overload protection. The **integrated busway system** ensures efficient current distribution, reducing voltage drops and improving overall system performance. Additionally, the CN55KN3A incorporates **advanced safety features**, including **arc-resistant design elements** to minimize the risk of explosive faults, and **IP21-rated** enclosures that provide protection against solid objects and limited water ingress, making it suitable for both indoor and outdoor applications with proper shielding.

For enhanced monitoring and control, the CN55KN3A can be integrated with **Eaton s Power Xpert digital protection and control systems**, enabling real-time diagnostics, remote monitoring, and predictive maintenance capabilities. This connectivity allows operators to receive alerts for potential issues before they escalate, improving system uptime and reducing maintenance costs. The center s **compact footprint** and **standardized mounting dimensions** simplify installation and integration with existing infrastructure, while its **high-quality materials**, including corrosion-resistant coatings and durable buswork, ensure long-term durability even in harsh industrial environments. Whether deployed in a high-demand manufacturing facility or a critical infrastructure application, the **Cutler-Hammer CN55KN3A** delivers a balance of performance, safety, and reliability, making it an indispensable component for modern electrical distribution systems.

The **Cutler-Hammer CN55KN3A** is an Eaton-branded motor starter, specifically a **3-phase, 55 kW (75 HP), AC motor starter** designed for industrial applications. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of buying a Cutler-Hammer CN55KN3A (Eaton)**

1. **Reliability and Brand Reputation**

- Eaton (formerly Cutler-Hammer) is a well-established manufacturer in industrial electrical components, known for durable and high-performance products. The CN55KN3A is part of their proven line of motor starters, which are widely used in manufacturing, HVAC, and other industrial sectors.

2. **Proper Ratings for Common Applications**

- The 55 kW (75 HP) rating makes it suitable for a wide range of motors in industrial settings, including pumps, compressors, conveyors, and fans. It can handle standard 3-phase, 480V or 600V applications, depending on the voltage rating of the motor.

3. **Overload Protection**

- The starter includes built-in **thermal overload protection**, which helps prevent motor damage from overheating due to overloads or stalling. This is a critical safety feature in industrial environments.

4. **Easy Installation and Maintenance**

- The CN55KN3A is designed for straightforward installation, with standard mounting configurations and clear wiring diagrams. Eaton provides detailed documentation, and replacement parts are readily available, reducing downtime.

5. **Compatibility with Control Systems**

- It integrates well with PLCs, relays, and other control systems, making it versatile for automated processes. The starter can be controlled manually or via remote signals.

6. **Energy Efficiency Considerations**

- While not a direct energy-efficient component, the starter s reliability helps minimize motor failures, which can reduce energy waste from frequent repairs or replacements.

7. **Long Lifespan**

- Eaton s motor starters are built to last decades with proper maintenance, offering a strong return on investment for industrial facilities.

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### **Cons of buying a Cutler-Hammer CN55KN3A (Eaton)**

1. **Cost**

- Eaton motor starters are premium-priced compared to some generic or aftermarket alternatives. For budget-conscious buyers, this may be a significant upfront investment.

2. **Potential for Overkill in Some Applications**

- If the motor is frequently started under light loads or in applications where soft-starting is not critical, a simpler starter (e.g., a basic magnetic starter without advanced features) might suffice, reducing costs.

3. **Limited Advanced Features**

- **Soft-start capabilities** (for reduced inrush current).

- **Variable frequency drive (VFD) compatibility** (though it can be used with VFDs, it s not designed for direct VFD integration).

- **Remote monitoring or smart diagnostics** (Eaton offers higher-end models with these features).

- If these features are needed, a more expensive or specialized starter (e.g., Eaton s **SoftStarter** or **VFD-compatible starters**) would be required.

4. **Maintenance Requirements**

- **Contact wear** (contacts may need cleaning or replacement over time).

- **Overload relay calibration** (to ensure proper protection).

- **Coil and wiring checks** (to prevent failures).

- Neglecting maintenance can lead to unexpected downtime.

5. **Space and Installation Constraints**

- The starter is a **hard-wired, panel-mounted unit**, meaning it requires dedicated space in an electrical panel. For applications with limited panel space, a more compact or modular solution might be preferable.

6. **Dependence on Eaton s Support**

- While Eaton has strong support, some buyers may prefer local distributors or aftermarket brands that offer quicker turnaround times for parts or service.

7. **Potential for Compatibility Issues**

- If the motor or control system has non-standard requirements (e.g., unusual voltage, frequency, or control signals), the CN55KN3A may not be a perfect fit without additional components (e.g., contactors, relays, or converters).

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### **Conclusion**

The **Cutler-Hammer CN55KN3A (Eaton)** is a **reliable, robust, and well-suited** motor starter for standard industrial applications where **basic overload protection and straightforward operation** are required. It excels in environments where **durability, brand trust, and ease of maintenance** are priorities. However, it may not be the best choice if:

- **Budget constraints** are a major concern (cheaper alternatives exist, though with trade-offs in reliability).

- **Advanced starting features** (e.g., soft-start, VFD compatibility) are needed.

- **Space is limited**, and a more compact solution is desired.

- **Custom or non-standard motor control** requirements exist.

For most **general-purpose, 3-phase motor applications** (e.g., pumps, fans, conveyors), the CN55KN3A is a **solid, long-term investment** that balances performance and cost effectively. If additional features are required, Eaton offers higher-end alternatives (e.g., soft starters or smart motor controllers) that may justify the extra cost.

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### **Recommendation**

You need a **reliable, standard 55 kW (75 HP) motor starter** for a **basic industrial application**.

**Overload protection and simplicity** are your primary concerns.

You value **Eaton s brand reputation** and **long-term availability of parts**.

Your motor does **not require soft-start, VFD, or advanced control features**.

You need **soft-start or VFD compatibility** (opt for Eaton s **SoftStarter** or a **VFD-compatible starter**).

You are on a **tight budget** (look for **generic or aftermarket starters**, though with potential trade-offs in reliability).

Your application has **space constraints** (consider a **modular or compact starter**).

You require **remote monitoring or smart diagnostics** (Eaton s **Smart Motor Starter** or **VFD solutions** may be better).

The **Eaton CN55KN3A is a strong, no-frills choice** for standard motor control needs. For applications with specialized requirements, explore Eaton s broader product line or consult an electrical engineer to ensure the best fit.

Details:

All products are guaranteed to be working but may show signs of use if purchasing a used product. Sells new and surplus product develops channels to purchase such. Part Number CN55KN3A. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection.

Call to use a shipping service other than the ones listed.

part #: cn55kn3a prices

• $1499.99-$2000.00

specifications automationjack:

• brand: Cutler Hammer
• mpn: Cn55kn3a

offer automationjack:

• best offers: True
• quantity: 1
• sold: 0
• options: Ship-to-home
• started: March 31, 2026
• availability: In Stock

payments automationjack:

• wallet: Paypal
• other
• credit card: Mastercard

seller automationjack:

• city: 1 Millennium Dr, Willingboro, NJ 08046
• rating: 99.6%
• # reviews: 197274

shipping automationjack:

• service: Standard
• class: Standard
• cost: $12.90
• transit: 30-35 Days
• type: Fixed

returns automationjack:

• method: Money back
• policy: Returns Accepted
• time: 30 Days
• paid by: Buyer

general automationjack:

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

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