ALLEN BRADLEY 42185-804-01 Overload Relay Starter 304272

( Brand: Allen Bradley ), ( Manufacturer Part Number: 42185-804-01 ), ( Part Type: Starter )

Review ALLEN BRADLEY Overload Relay Starter #304272

The **Allen-Bradley 42185-804-01 Overload Relay for Starter 304272** is a precision-engineered electrical protection device designed to safeguard three-phase induction motors and other inductive loads from excessive thermal stress caused by overload conditions, phase loss, or stalled rotor scenarios. Part of Rockwell Automation s robust line of motor control components, this overload relay is specifically engineered to integrate seamlessly with the **304272 starter**, ensuring reliable operation in industrial applications where motor protection is critical. Constructed with a durable, high-quality housing, the relay features a robust thermal element that continuously monitors motor current, dynamically adjusting to varying load demands while maintaining optimal protection. Its **three-phase thermal overload design** ensures balanced protection across all phases, preventing uneven heating that could lead to premature motor failure. The relay incorporates a **mechanical trip mechanism** that disengages the starter s contactor upon detecting an overload, effectively isolating the motor from the power source until conditions return to normal. This design minimizes downtime and extends the lifespan of both the motor and associated control equipment. Additionally, the **42185-804-01** is equipped with a **reset button**, allowing for easy manual reset after a trip event, while also offering an optional **auxiliary contact** for signaling or interlocking applications. Its compact yet sturdy construction ensures easy installation within control panels, and its compatibility with the **304272 starter** guarantees a cohesive and efficient motor protection solution. Whether deployed in manufacturing plants, HVAC systems, or material handling applications, this overload relay provides dependable thermal protection, helping to maintain operational continuity and reduce the risk of costly equipment damage.

### **Pros and Cons of buying a Allen-Bradley 42185-804-01 Overload Relay for Starter 304272**

1. **Compatibility** This overload relay is specifically designed for the Allen-Bradley 304272 starter, ensuring proper fit and function without modification. It is a direct replacement part, reducing the risk of installation errors.

2. **Reliability** Allen-Bradley is a well-established brand in industrial automation, known for producing durable and high-quality components. The 42185-804-01 is engineered to withstand frequent thermal cycling and mechanical stress, which is common in motor control applications.

3. **Thermal Protection** The relay includes overload protection, which prevents motor damage by tripping when excessive current flows through the motor. This helps extend the lifespan of both the motor and the starter.

4. **Easy Installation** Since it is a direct replacement, installation is straightforward. It can be swapped in without requiring significant adjustments to the existing wiring or control panel.

5. **Standardized Design** The relay follows industry standards for overload protection, making it compatible with common control schemes and PLC configurations. This simplifies troubleshooting and maintenance.

6. **Long-Term Availability** As an older but widely used component, this relay is likely to remain available through authorized distributors or third-party suppliers, reducing the risk of obsolescence.

7. **Cost-Effective for Replacement** Purchasing a new relay is often more cost-effective than repairing or modifying an existing faulty unit, especially if the original relay has failed due to wear or thermal stress.

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1. **Age of the Product** The 42185-804-01 is part of an older series of Allen-Bradley overload relays. While it remains functional, newer models may offer improved features such as digital communication interfaces, adjustable trip curves, or enhanced diagnostics.

2. **Limited Advanced Features** Unlike modern overload relays, this unit lacks smart features such as remote monitoring, programmable trip settings, or integration with digital control systems. If your application requires advanced diagnostics, you may need to supplement it with additional hardware.

3. **Potential for Counterfeit Parts** Due to its age, there is a risk of purchasing counterfeit or low-quality replicas from untrusted sellers. Always buy from authorized distributors or reputable suppliers to avoid performance issues.

4. **Mechanical Wear** If the original relay was in service for an extended period, the new unit may still be subject to wear if the starter or motor is heavily stressed. Regular maintenance and inspection are recommended.

5. **Compatibility with Modern Systems** If you are integrating this starter into a newer control system (e.g., PLC with HMI), you may need additional interfaces or converters to ensure seamless operation, as the relay does not support digital communication.

6. **Limited Warranty** Allen-Bradley s warranty policies for older components may be less comprehensive than those for newer products. Always check the warranty terms before purchase.

7. **Discontinuation Risk** While still available, there is a possibility that Allen-Bradley may discontinue this specific part in the future. It is wise to purchase spare units if you anticipate long-term use.

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The **Allen-Bradley 42185-804-01 overload relay** is a **reliable and cost-effective solution** for replacing a faulty overload relay in a **304272 starter**. Its direct compatibility, durability, and thermal protection make it a practical choice for industrial applications where immediate replacement is needed. However, if your system requires **advanced diagnostics, digital integration, or future-proofing**, you may need to consider upgrading to a newer model or supplementing the relay with additional components.

For most **basic motor control applications** where simplicity and compatibility are prioritized, this relay remains a **sound investment**. Always ensure you purchase from a **trusted source** to avoid counterfeit parts and verify compatibility with your specific motor and control setup.

- **Buy from an authorized distributor** (e.g., Grainger, Rockwell Automation, or a local industrial supplier) to guarantee authenticity and warranty coverage.

- **Check the condition of the starter and motor** before installation. If the starter shows signs of wear (e.g., burnt contacts, loose wiring), address those issues first.

- **Consider a spare unit** if this relay is critical to your operation, as spares can be harder to source over time.

- **If upgrading your system**, evaluate whether a **modern overload relay with digital features** (e.g., Allen-Bradley 860 series) would provide better long-term benefits despite a higher upfront cost.

For most users, the **42185-804-01 is a solid, functional replacement** that balances cost, reliability, and ease of use. However, if your application demands advanced monitoring or future scalability, weigh the trade-offs carefully.

Details:

ALLEN BRADLEY 42185-804-01. MANUFACTURER PART NUMBER: 42185-804-01. voltage RANGE: 120 - 600V AC. NEMA A600 RATING.

OVERLOAD RELAY for STARTER.

part #: 4218580401 prices

• $12.50-$38.25

specifications automationjack:

• brand: Allen Bradley
• mpn: 42185-804-01
• part type: Starter

returns automationjack:

• policy: No Returns

offer automationjack:

• quantity: 3
• started: May 31, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock
• best offers: True

shipping automationjack:

• cost: $21.96
• service: FedEx Ground / FedEx Home Delivery, UPS Ground, USPS Priority Mail, FedEx Standard Overnight
• type: Calculated
• class: Standard, Expedited, One-day
• carrier: FedEx, UPS, USPS
• transit: 4-6 Days

seller automationjack:

• # reviews: 21922
• rating: 99.9%
• city: Clinton Township, Michigan

general automationjack:

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

payments automationjack:

• wallet: Google-pay
• other
• credit card: Visa

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