ALLEN BRADLEY 100-A09NA3 Automation

( Brand: Allen Bradley ), ( Manufacturer Part Number: 100-A09NA3 )

Review ALLEN BRADLEY 100a09na3 Used

The **Allen-Bradley 100-A09NA3** is a high-performance, compact motor starter designed for reliable control and protection of three-phase induction motors in industrial, commercial, and automation applications. Part of Rockwell Automation s **PowerFlex** series, this motor starter is engineered to deliver robust performance in demanding environments while ensuring operational efficiency and safety. With a **90-ampere (A) continuous current rating**, it is well-suited for controlling motors ranging from fractional horsepower to approximately 15 horsepower, depending on the motor type and ambient conditions. The starter features a **thermal overload protection** mechanism that safeguards the motor from excessive current, preventing overheating and potential damage, while its **magnetic contactor** provides fast, reliable switching with minimal arcing, extending the lifespan of both the starter and connected equipment.

Constructed with **durable, corrosion-resistant materials**, the 100-A09NA3 is built to withstand harsh industrial environments, including exposure to dust, moisture, and temperature fluctuations, making it ideal for applications in manufacturing plants, food processing facilities, HVAC systems, and material handling equipment. Its **compact, modular design** allows for easy integration into control panels, saving valuable space while maintaining accessibility for maintenance and troubleshooting. The starter incorporates **Allen-Bradley s proven contactor technology**, featuring **silver-cadmium oxide contacts** that ensure low contact resistance and superior wear resistance, reducing the risk of failure over extended operational cycles. Additionally, the **auxiliary contacts** provide versatile signaling capabilities, enabling seamless integration with PLCs, relays, or other control systems for advanced automation sequences.

For enhanced safety and operational flexibility, the 100-A09NA3 includes **auxiliary overload relays** that can be configured for remote monitoring or interlocking functions, allowing operators to track motor health and respond proactively to potential issues. The starter s **NEMA 1 or NEMA 4X enclosure options** (depending on the specific variant) provide protection against solid objects, oil, and cooling liquids, ensuring reliability in both indoor and outdoor settings. Its **low-profile mounting design** simplifies installation in tight spaces, while the **clear labeling and color-coded terminals** facilitate quick and accurate wiring, reducing setup time and minimizing human error. Whether used in a new installation or as a replacement for aging equipment, the 100-A09NA3 combines **durability, precision, and ease of use** to meet the rigorous demands of modern industrial automation.

### **Pros and Cons of buying a Allen-Bradley 100-A09NA3 (100A09NA3) Motor Control Relay**

#### **Overview**

The **Allen-Bradley 100-A09NA3** is a **100-ampere motor control relay (MCR)** designed for industrial applications, particularly in **motor starters, control panels, and automation systems**. It is part of Rockwell Automation s **100 Series** of motor starters, which are widely used in manufacturing, HVAC, and process control environments.

---

### **Pros**

1. **High Reliability and Durability**

- Built to **industrial standards**, the 100-A09NA3 is designed for **long-term, high-cycle operation** in harsh environments.

- Uses **high-quality contact materials** (e.g., silver or silver-plated contacts) that resist **arcing, welding, and wear**, reducing failure risk over time.

- **Sealed construction** protects against **dust, moisture, and contaminants**, making it suitable for **dirty or corrosive environments**.

2. **Wide Voltage and Current Ratings**

- Supports **AC voltages up to 600V** and **DC voltages up to 600V**, making it versatile for different power systems.

- **100-ampere rating** allows it to control **medium to large motors** (e.g., 3-phase motors in the **10-50 HP range**, depending on voltage and power factor).

- **Overload protection** (via thermal overload relays) helps prevent motor damage from **overcurrent conditions**.

3. **Easy Installation and Integration**

- **Standard NEMA 1 or NEMA 4/4X enclosures** (depending on model variant) allow for **quick mounting** in control panels.

- **Modular design** can be paired with **Allen-Bradley overload relays, contactors, and auxiliary relays** for complete motor control solutions.

- **Compatible with PLCs** (e.g., **Rockwell Automation s ControlLogix, CompactLogix, or Micro800**) for **automated control sequences**.

4. **Low Maintenance Requirements**

- **Minimal moving parts** reduce the need for frequent adjustments or replacements.

- **Self-cleaning contacts** (due to arcing) help maintain performance over time.

- **Long lifespan** properly maintained units can operate for **decades** with minimal issues.

5. **Cost-Effective for Industrial Use**

- While **not the cheapest option**, it offers **better long-term value** than lower-quality relays due to its **durability and reliability**.

- **Widely available** (new and used markets), reducing procurement lead times.

- **Spare parts and replacements** are easy to find, lowering downtime costs.

6. **Safety Features**

- **Arc-resistant design** minimizes the risk of **electrical fires or explosions** during switching.

- **Overload protection** helps prevent **motor burnout** from sustained overcurrent.

- **Mechanical interlocking** (if used with complementary relays) improves **safety in automated systems**.

7. **Backward and Forward Compatibility**

- Works with **older Allen-Bradley systems** and can be integrated into **modern automation setups**.

- **Standardized mounting and wiring** make retrofitting easier in existing control panels.

---

### **Cons**

1. **Higher Upfront Cost Compared to Basic Relays**

- More expensive than **generic or non-branded motor control relays**, which may be sufficient for **low-budget applications**.

- **Used units** can be found at a discount, but **new units** are pricier than some competitors (e.g., **Siemens, Schneider Electric, or TE Connectivity**).

2. **Limited to Specific Voltage and Current Ranges**

- **Not suitable for very high-power applications** (e.g., **>100 HP motors** without additional components like **soft starters or variable frequency drives**).

- **DC applications** require careful selection of variants (some 100 Series units may not be ideal for DC control).

3. **Physical Size and Space Requirements**

- **Bulkier than some modern solid-state relays**, which may be a constraint in **space-limited control panels**.

- **NEMA enclosures** add to the **footprint** compared to compact electronic alternatives.

4. **Potential for Contact Wear Over Time**

- While durable, **frequent switching (e.g., in high-cycle applications)** can lead to **contact erosion**, requiring eventual replacement.

- **Arcing** during switching can, in rare cases, **damage contacts** if the relay is not properly sized for the load.

5. **Dependence on Proper Installation and Maintenance**

- **Improper wiring, loose connections, or lack of lubrication** (if applicable) can reduce lifespan.

- **Overloading beyond rated capacity** can cause **premature failure**, so **correct sizing is critical**.

- **Environmental factors** (e.g., **extreme temperatures, high humidity**) may require **additional protection** (e.g., **enclosure upgrades**).

6. **Limited Digital Communication Features**

- Unlike **modern smart relays**, the **100-A09NA3 lacks built-in digital communication** (e.g., **Modbus, Ethernet, or IoT connectivity**).

- Requires **external PLCs or SCADA systems** for advanced monitoring and control.

7. **Potential Availability Issues for Rare Variants**

- While **common**, some **specific variants or older stock** may be **harder to find** in the used market.

- **Longer lead times** for **custom or discontinued models** compared to mass-produced alternatives.

---

### **Conclusion**

The **Allen-Bradley 100-A09NA3** is a **high-quality, reliable motor control relay** ideal for **industrial applications requiring durability, safety, and ease of integration**. Its **strong points reliability, overload protection, and compatibility with Rockwell Automation systems make it a preferred choice** for **manufacturing, HVAC, and process control** environments where **long-term performance is critical**.

However, **higher upfront costs, physical size, and lack of advanced digital features** may make it **less suitable for budget-conscious or high-tech applications**. If **cost is a major concern**, alternatives like **Siemens 3RT or Schneider Electric TE** may offer similar performance at a lower price. If **space and digital integration are priorities**, **solid-state relays or smart motor starters** could be worth considering.

For **most traditional industrial motor control needs**, the **100-A09NA3 remains a strong, dependable choice** especially when paired with **proper overload protection and maintenance practices**.

---

### **Final Recommendation**

You need a **reliable, long-lasting motor control relay** for **industrial applications**.

Your system **requires compatibility with Rockwell Automation PLCs** (e.g., ControlLogix, CompactLogix).

You operate in a **harsh environment** (dust, moisture, temperature fluctuations) where **durability is critical**.

You prioritize **overload protection and safety features** over advanced digital controls.

You can **justify the higher upfront cost** based on **reduced maintenance and downtime**.

You are working with **tight budgets** and can find a **similarly rated generic relay** at a lower cost.

Your application requires **high-speed switching or digital communication** (e.g., Modbus, Ethernet).

**Space is extremely limited**, and a **smaller solid-state relay** would suffice.

You need **very high-power control** (>100 HP) without additional components like **VFDs or soft starters**.

- **Verify the exact variant** (e.g., **NEMA 1 vs. NEMA 4 enclosure**) to ensure it matches your environmental needs.

- **Pair it with the correct overload relay** (e.g., **100-A09NA3 with a 100-A09NA3 overload unit**).

- **Follow Allen-Bradley s wiring and maintenance guidelines** to maximize lifespan.

- **Check for used/refurbished units** if cost is a concern, but ensure they are **tested and in good condition**.

For **most traditional industrial motor control scenarios**, the **100-A09NA3 is a sound investment** that balances **performance, reliability, and compatibility** effectively.

Details:

Call to use a shipping service other than the ones listed. The product is used surplus. All products are guaranteed to be working but may show signs of use. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection.

part #: 100a09na3 prices

• $19.80-$97.00

specifications automationjack:

• brand: Allen Bradley
• mpn: 100-a09na3

offer automationjack:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: April 30, 2026
• quantity: 1

payments automationjack:

• credit card: Diners-club
• other
• wallet: Google-pay

shipping automationjack:

• class: Standard
• cost: $12.90
• transit: 2-5 Days
• type: Fixed
• service: Standard

returns automationjack:

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

general automationjack:

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

seller automationjack:

• rating: 99.7%
• city: 1 Millennium Dr, Willingboro, NJ 08046
• # reviews: 2018 12

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