CUTLER HAMMER 9-642-21 Eaton

( Brand: Cutler Hammer ), ( Manufacturer Part Number: 9-642-21 )

Review CUTLER HAMMER Eaton Corporation 964221 Used

The **Cutler-Hammer 9-642-21 (Eaton 964221)** is a robust, high-performance **air circuit breaker** designed for industrial and commercial electrical distribution systems, offering reliable protection against overloads, short circuits, and other fault conditions. Part of Eaton s trusted **PowerXpert** line, this breaker is engineered with precision to meet stringent industry standards, ensuring dependable operation in demanding environments. Its compact yet durable construction features a **molded case** built to withstand harsh conditions, including exposure to dust, moisture, and temperature fluctuations, making it ideal for applications in manufacturing plants, commercial buildings, and industrial facilities where uptime is critical.

The **9-642-21** operates on a **magnetic trip mechanism**, providing fast and accurate fault interruption to prevent equipment damage and minimize downtime. Its **adjustable trip settings** allow for customizable protection curves, accommodating a wide range of load requirements while maintaining safety. The breaker is equipped with a **clear, easy-to-read trip indicator**, enabling quick visual confirmation of fault conditions, which is essential for rapid troubleshooting and maintenance. Additionally, its **interrupting rating of 10,000 amps** ensures it can safely handle severe fault currents, further enhancing its suitability for high-demand electrical systems.

Designed for ease of installation and maintenance, the **Cutler-Hammer 9-642-21** features a **standard NEMA 1 enclosure**, compatible with most industrial panel configurations. Its **quick-disconnect terminals** simplify wiring and reduce installation time, while the **auxiliary contact** option allows for remote monitoring and control integration. The breaker s **long service life** is backed by Eaton s reputation for quality, with components built to endure millions of operations without degradation. Whether used in motor control centers, switchgear, or distribution panels, this breaker delivers consistent performance, ensuring the integrity of electrical systems while adhering to strict safety protocols.

### **Pros and Cons of buying a Cutler-Hammer 9-642-21 (Eaton 964221) Circuit Breaker**

#### **Overview**

The **Cutler-Hammer 9-642-21 (Eaton 964221)** is a **200-amp, 4-pole molded case circuit breaker (MCCB)** designed for industrial and commercial electrical panels. It is part of the **PowerFlex** series and is commonly used in motor control centers, switchgear, and distribution boards. Below is a detailed breakdown of its advantages and disadvantages.

---

### **Pros**

1. **High Reliability and Durability**

- Built with robust construction, this breaker is designed for heavy-duty applications, making it suitable for continuous industrial use.

- Features a **mechanical trip unit** that ensures consistent operation even under harsh conditions.

2. **Wide Voltage and Current Ratings**

- Rated for **240V or 480V AC**, it can handle high-power loads, including large motors and transformers.

- The **200-amp rating** provides ample capacity for most medium-sized industrial and commercial setups.

3. **Adjustable Trip Settings**

- Allows for **instantaneous and time-delay trip adjustments**, enabling fine-tuning for different load profiles.

- Useful in applications where **motor starting currents** or **transient surges** are common.

4. **Modular and Expandable Design**

- Fits into standard **NEMA 3 or 4 enclosure panels**, making it easy to integrate into existing systems.

- Can be paired with **auxiliary relays and accessories** for remote monitoring and control.

5. **Thermal and Magnetic Protection**

- Provides **overload protection** (thermal) and **short-circuit protection** (magnetic), reducing the risk of equipment damage.

- The **instantaneous trip curve** helps clear faults quickly, minimizing downtime.

6. **Long Lifespan and Low Maintenance**

- Designed for **millions of operations**, reducing the need for frequent replacements.

- Minimal moving parts mean **lower wear and tear** compared to some alternatives.

7. **Compatibility with Eaton s E-Series**

- Part of Eaton s **PowerFlex MCCB family**, which is widely trusted in industrial applications.

- Easily interchangeable with other **Eaton 964221-compatible breakers** if upgrades are needed.

8. **Good Availability and Support**

- Widely stocked by electrical distributors, ensuring easy replacement if needed.

- Eaton provides **technical support and spare parts** for extended equipment life.

---

### **Cons**

1. **Higher Upfront Cost**

- Compared to **generic or aftermarket MCCBs**, this Eaton/Cutler-Hammer breaker is **more expensive**.

- May require a larger budget for installation in new systems.

2. **Complex Installation and Wiring**

- Requires **proper alignment and secure mounting** due to its modular design.

- Incorrect wiring or installation can lead to **false trips or malfunctions**, necessitating skilled labor.

3. **Limited Availability of Replacement Parts**

- While Eaton supports this model, **some auxiliary components or specific accessories** may be harder to find than on more common breakers.

- Older stock may require **backordered parts**, causing delays.

4. **Potential for False Trips in Certain Conditions**

- If not properly **set for the load**, the breaker may trip due to **inrush currents** (e.g., motor starts) or **transient spikes**.

- Requires **careful calibration** to avoid nuisance tripping.

5. **Size and Enclosure Space Requirements**

- As a **4-pole breaker**, it occupies more space in a panel than single-pole or dual-pole alternatives.

- May require **larger NEMA enclosures**, increasing installation complexity.

6. **Dependence on Eaton s Brand Loyalty**

- Some electrical contractors and facilities prefer **brand-specific solutions**, which can limit flexibility if switching suppliers.

- If moving to a **non-Eaton system**, compatibility may require additional verification.

7. **Potential for Obsolescence**

- Eaton has **phased out some older models** in favor of newer **PowerFlex or PowerFlex Plus** series.

- Future **spare parts or upgrades** may become more difficult to source.

---

### **Conclusion**

The **Cutler-Hammer 9-642-21 (Eaton 964221)** is a **high-quality, reliable, and durable** circuit breaker well-suited for **industrial and commercial applications requiring high current handling and adjustable trip settings**. Its **modular design, thermal/magnetic protection, and long lifespan** make it a strong choice for **motor control, distribution panels, and switchgear**.

However, its **higher cost, complex installation requirements, and potential for false trips if misconfigured** may be drawbacks for smaller budgets or simpler applications. Additionally, **long-term availability of parts** could be a concern if the system remains in service for decades.

For **medium to large industrial facilities** where **reliability and performance** are critical, this breaker is an **excellent investment**. For **smaller setups or cost-sensitive projects**, alternatives like **Siemens, Schneider Electric, or lower-cost generic MCCBs** may be more practical.

---

### **Recommendation**

- You need a **high-performance, adjustable-trip MCCB** for **industrial motor control or distribution**.

- Your application requires **200-amp, 4-pole protection** with **thermal and magnetic trip curves**.

- You have **skilled electricians** available for proper installation and calibration.

- Long-term **reliability and Eaton s support network** are priorities.

- Budget constraints make this breaker **too expensive** compared to other brands.

- The application is **low-voltage or low-current**, where a **simpler breaker** would suffice.

- You prefer **more widely available or newer models** (e.g., Eaton s **PowerFlex Plus** series).

- The system is **small-scale or commercial**, where **cost-effective generic breakers** may work.

For **industrial applications demanding durability and adjustability**, the **Eaton 964221 is a strong, well-supported choice**. However, weigh the **initial cost and installation complexity** against your specific needs before purchasing. Always ensure **proper sizing, wiring, and calibration** to maximize performance and minimize false trips.

Details:

All products are guaranteed to be working but may show signs of use if purchasing a used product. 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. Sells new and surplus product develops channels to purchase such.

EATON CORPORATION 9-642-21 / 964221 USED MAGNET COIL.

part #: 964221 price

• $60.00

specifications automationjack:

• brand: Cutler Hammer
• mpn: 9-642-21

returns automationjack:

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

general automationjack:

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

shipping automationjack:

• cost: $12.90
• class: Standard
• type: Fixed
• transit: 27-32 Days
• service: Standard

seller automationjack:

• city: 1 Millennium Dr, Willingboro, NJ 08046
• rating: 99.6%
• # reviews: 193526

offer automationjack:

• quantity: 1
• sold: 0
• options: Ship-to-home
• started: March 8, 2026
• availability: In Stock

payments automationjack:

• wallet: Paypal
• other
• credit card: Mastercard

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