ALLEN BRADLEY 100-A24NB3 Automation

( Brand: Allen Bradley ), ( Manufacturer Part Number: 100-A24NB3 )

Review ALLEN BRADLEY 100a24nb3 Used

The **Allen-Bradley 100-A24NB3** (also referenced as **100A24NB3**) is a high-performance, compact industrial motor starter designed for demanding applications in manufacturing, automation, and process control environments. Part of Rockwell Automation s **PowerFlex** series, this motor starter is engineered to provide reliable, efficient control of three-phase AC induction motors ranging from **0.5 to 20 horsepower (0.4 to 15 kW)** at standard voltages of **200 240V AC, 50/60 Hz**. Its robust construction ensures durability in harsh industrial settings, where exposure to dust, moisture, and temperature fluctuations is common. The starter features a **non-fused thermal overload relay**, which protects the motor from overload conditions by monitoring current draw and automatically disconnecting the motor if overheating is detected, thus extending equipment lifespan and preventing costly downtime.

At its core, the **100-A24NB3** incorporates a **magnetic contactor** with **three normally open (NO) main contacts** rated for **240V AC, 20A**, capable of handling continuous duty cycles with minimal arcing or wear. The starter is equipped with a **built-in auxiliary relay**, providing an additional set of **normally open and normally closed (NO/NC) contacts** for control signal applications, such as interlocking with other devices or integrating into PLC-based control systems. Its **compact, DIN-rail mountable design** allows for space-efficient installation in control panels, enclosures, or directly on machinery, making it ideal for applications where footprint is a consideration.

For enhanced safety and operational flexibility, the **100-A24NB3** includes a **manual reset pushbutton station**, which can be configured for **start/stop, stop-only, or auxiliary control functions**, depending on the application requirements. The pushbutton station is designed for easy access and can be mounted separately or integrated into the starter s enclosure, depending on the system layout. Additionally, the starter supports **remote control via auxiliary contacts or external control devices**, enabling seamless integration into larger automation systems where centralized or automated control is necessary.

One of the standout features of this motor starter is its **low-energy consumption design**, which minimizes power draw during idle states, contributing to energy efficiency in industrial operations. The **non-fused thermal overload protection** is calibrated for precise motor current monitoring, reducing the risk of nuisance tripping while still providing robust safeguarding against sustained overloads. The starter also adheres to **NEMA 1 and IP20 protection ratings**, ensuring basic protection against solid objects and limited ingress of dust, making it suitable for indoor applications where environmental hazards are controlled.

The **100-A24NB3** is compatible with a wide range of **Allen-Bradley control devices**, including **PowerFlex variable frequency drives (VFDs), PLCs, and relays**, allowing for seamless integration into modern automation architectures. Its **standard wiring terminals** simplify installation and maintenance, while the **clear labeling and modular design** facilitate quick troubleshooting and component replacement. Whether used in **conveyor systems, pump applications, HVAC controls, or material handling equipment**, this motor starter delivers consistent performance, reliability, and ease of use, making it a trusted choice for industrial control engineers and maintenance technicians alike.

### **Pros and Cons of buying a Allen-Bradley 100-A24NB3 (100A24NB3) Motor Starter**

#### **Overview**

The **Allen-Bradley 100-A24NB3** is a **non-reversing, motor starter** designed for controlling **three-phase AC motors** up to **24 horsepower (HP)** at **208 230V AC**. It is part of the **100 Series** of motor starters, which are widely used in industrial automation, HVAC systems, and general machinery applications.

---

### **Pros**

1. **Reliability and Durability**

- Allen-Bradley products are known for their **high-quality construction** and **long operational lifespan**, making them suitable for **harsh industrial environments**.

- The **100 Series** is designed for **high-cycle operation**, meaning it can handle frequent starts and stops without excessive wear.

2. **Compatibility with PLCs and Control Systems**

- The **100-A24NB3** integrates seamlessly with **Allen-Bradley PLCs (e.g., SLC 500, Micro800, ControlLogix)** and other **industrial control systems**.

- It supports **standard control signals (24V DC or 120V AC)** for easy integration into existing automation setups.

3. **Standardized and Well-Supported**

- As a **legacy but widely available** component, spare parts and replacements are **easy to source** from **Allen-Bradley distributors, Rockwell Automation, or third-party suppliers**.

- Documentation, wiring diagrams, and troubleshooting guides are **readily available** online.

4. **Cost-Effective for Medium-Duty Applications**

- While not the **cheapest** starter on the market, it offers **good value for its performance and reliability**, especially in **commercial and light industrial applications**.

- Avoids the need for **custom or expensive specialty starters** for standard motor control needs.

5. **Overload Protection Built-In**

- Includes **thermal overload protection** to prevent motor damage from **overcurrent conditions**, reducing the risk of equipment failure.

6. **Easy Installation and Maintenance**

- **Modular design** allows for **quick replacement** if components fail.

- **Standard NEMA 1 or NEMA 4 enclosure options** (depending on model variant) provide flexibility for different environmental conditions.

7. **Backward Compatibility**

- Works with **older control systems** and can be retrofitted into existing installations without major modifications.

---

### **Cons**

1. **Limited Horsepower Rating**

- The **24 HP maximum rating** restricts its use to **smaller motors**, making it unsuitable for **high-power industrial applications** (e.g., large pumps, compressors, or conveyors).

- For motors **above 24 HP**, a **larger starter (e.g., 100-A37NB3 or 100-A50NB3)** or a **soft starter** may be required.

2. **No Reversing Capability**

- Unlike **reversing starters (e.g., 100-A24RB3)**, this model **cannot control motor direction**, limiting its use in applications requiring **bidirectional operation**.

3. **Potential for Obsolescence**

- While still in production, the **100 Series is older** compared to newer Allen-Bradley models (e.g., **PowerFlex, Kinetix, or newer 100 Series variants**).

- Some **newer control systems** may have **better efficiency, digital diagnostics, or remote monitoring** features.

4. **Higher Upfront Cost Compared to Basic Starters**

- Cheaper **non-branded or generic motor starters** (e.g., from **Siemens, Schneider, or local manufacturers**) may be available at a **lower price**, though with **potentially shorter lifespans**.

- If buying **new**, the cost may be higher than **refurbished or used units** (though reliability should be verified).

5. **Enclosure Limitations**

- Standard **NEMA 1 (general-purpose)** or **NEMA 4 (weatherproof)** enclosures may not be sufficient for **extreme environments** (e.g., **NEMA 4X for corrosive or explosive hazards**).

- Additional **enclosure upgrades** may be needed for **harsh conditions**.

6. **Manual Operation Option (If Applicable)**

- Some variants may require **manual pushbuttons** for start/stop, which can be a **safety and convenience drawback** compared to **fully automated PLC-controlled starters**.

7. **Limited Advanced Features**

- **Soft start/stop** (requires additional components).

- **Remote monitoring** (no built-in IoT or predictive maintenance capabilities).

- **Energy-saving modes** (unlike newer variable frequency drives).

---

### **Conclusion**

The **Allen-Bradley 100-A24NB3** is a **reliable, well-supported, and widely compatible** motor starter ideal for **medium-duty, non-reversing applications** up to **24 HP**. It excels in **industrial settings where reliability, PLC integration, and standard control are priorities**, but it may be **overkill or too limited** for **high-power, reversing, or highly automated systems**.

For **small to medium industrial motors** where **cost, durability, and ease of integration** matter most, this starter is a **strong choice**. However, if **higher horsepower, reversing capability, or advanced control features** are needed, a **different model (e.g., 100-A37NB3, 100-A50NB3, or a soft starter)** should be considered.

---

### **Recommendation**

- You need a **reliable, standard motor starter** for **24 HP or below**.

- Your application **does not require motor reversal**.

- You are working with **Allen-Bradley PLCs or control systems**.

- You prioritize **long-term availability and support** over the latest features.

- You need **higher horsepower** (e.g., **100-A37NB3 for 37 HP**).

- **Motor reversal is required** (e.g., **100-A24RB3**).

- You want **modern features** like **soft start, energy efficiency, or remote monitoring** (consider **Allen-Bradley PowerFlex drives**).

- Your budget allows for **cheaper, non-branded starters** for **non-critical applications**.

- If possible, **verify compatibility with your existing system** before purchasing.

- Check for **refurbished or used units** to reduce costs while maintaining reliability.

- Ensure **proper overload protection settings** are configured for your motor.

- Store spare parts in case of **component failure** (e.g., thermal overload relays).

Overall, the **100-A24NB3 remains a solid, proven choice** for many industrial motor control needs, but **careful consideration of application requirements** will determine if it is the best fit.

Details:

Call to use a shipping service other than the ones listed. 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. Sells new and surplus product develops channels to purchase such.

part #: 100a24nb3 prices

• $38.88-$200.00

specifications automationjack:

• brand: Allen Bradley
• mpn: 100-a24nb3

shipping automationjack:

• transit: 31-36 Days
• type: Fixed
• service: Standard
• cost: $12.90
• class: Standard

offer automationjack:

• availability: In Stock
• quantity: 1
• options: Ship-to-home
• sold: 0
• started: February 10, 2026

returns automationjack:

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

payments automationjack:

• other
• wallet: Paypal
• credit card: Diners-club

general automationjack:

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

seller automationjack:

• city: 1 Millennium Dr, Willingboro, NJ 08046
• rating: 99.5%
• # reviews: 189502

Allen Bradley 100-A24NB3 Is Similar To:

• Allen Bradley 1489-m1c020 Ser.d 1 Pole 2a Circuit Braker (43.3% similar) New - old stock inventory as pictured not in original box item comes shown and only includes what is the photos, please look over carefully prior to purchase. Allen Bradley 1489-M1C020 sear.d 1 pole 2a circuit breaker. Some items may have slight cosmetic damage which is noted in the condition of ...(October 5th, 2023)
• Allen-bradley 2198-p070 Kinetix 5700 Dc Bus Fw14.001 2198p070 New (41.5% similar) Return police: it will just take you 1 minute. Please leave a telephone number for on-time delivery. 2198-P070 Allen Bradley kinetic 5700 dc bus FW14.001 2198P070 new dear customer, there is one things need to be noticed before placing an order...(October 8th, 2023)
• Allen-bradley Vpl-b0752f-pj12aa Allen-bradley Servo Motor For Parts Repair (31% similar) Please see pictures for more detail. It has not been tested. Sale includes: Allen-bradley VPL-B0752F-PJ12AA servo motor, for parts/ repair. Condition of internal components is unknown. Sorry, no other parts or accessories included. Functionality is unknown. Item has not been opened or disassembled. ...(November 10th, 2023)
• Allen-bradley 800f-x01l Contact Cartridge Bag Of 10 Sa (42.1% similar) They are new in the bag...(November 17th, 2023)
• Allen Bradley 800h-r3ha7 Selector Switch Station New (45.2% similar) It is carefully crafted with premium materials to withstand harsh conditions, ensuring that it will last for years come. The station is designed with a focus on functionality, making it easy to operate and providing you complete control over your equipment...(November 18th, 2023)
• Allen-bradley 2803-cm Series A Camera Mux Module (40.4% similar) Allen Bradley 2803-CM series a camera mix module condition - preowned, GC1-D-MBKY...(November 19th, 2023)
• Allen Bradley 100s-c30udj13bc Motor Controller Combination Rev-starte S 146393 (31.7% similar) Allen Bradley 100S-C30UDJ13BC motor controller combination rev-starter and base, 24 CDC. Manufacturer part number: 100S-C30UDJ13BC...(November 26th, 2023)
• Allen Bradley 800a-h2bw Ser B Maintained Selector Switch Nos Free Fast Ship (37.9% similar) Part #: Allen Bradley 800A-H2BW for sale...(December 20th, 2023)
• Guardmaster Ltd 440k-t11341 Allen Bradley 440kt11341 Series B Safety Interlock Switch (30.2% similar) Allen Bradley 440K-T11341, 440KT11341, series b, safety interlock switch lock: cabinet 2 top shelf 1210...(December 21st, 2023)
• Allen-bradley 2198-h20ck Dsl Converter Kit Sser B Fw 1.18 236757 (34.3% similar) MCSALE25X: : Allen Bradley 1756-IB16 sear a cat rev H01 f/w 3.2 dc input 16PT 24VDCUSED good condition may look different than photo have shelf ware BB61APD1 pd D78 item is sold as where...(January 3rd, 2024)
• Allen-bradley 4963-ds Surge Protector With Dry Contact Indication (28.3% similar) Allen Bradley 4963-DS surge protector with dry contact indication, 277 vac 60 Hz, 420 vac cove, in 20,000 a, CPR 1500 v, these are unused. Offer is for all they are dirty from sitting around, but they unused...(January 8th, 2024)