FURNAS ELECTRIC CO 3RB2-113-4SB0 Siemens

( Brand: Furnas Electric Co ), ( Manufacturer Part Number: 3RB2-113-4SB0 )

Review FURNAS ELECTRIC CO Siemens 3rb21134sb0 Used

The **Furnas Electric 3RB2-113-4SB0 (Siemens 3RB21134SB0)** is a high-performance, three-phase, low-voltage motor starter designed for industrial applications requiring robust control, reliability, and efficiency. Part of Siemens well-regarded 3RB2 series, this magnetic contactor is engineered to handle demanding environments while ensuring seamless operation in motor control circuits. Built with a compact yet durable construction, it integrates a robust coil mechanism, high-quality silver-plated contacts, and a sturdy enclosure rated for IP20 protection, making it suitable for indoor installations where moderate environmental exposure is expected. The 4SB0 designation indicates a specific variant within the series, likely featuring a 4-pole configuration with a rated voltage of 110V AC for the control coil, ensuring compatibility with standard industrial power supplies. This starter is equipped with a thermal overload relay, providing built-in protection against motor overloads, short circuits, and phase failures, thereby enhancing operational safety and extending the lifespan of connected equipment. Its modular design allows for easy integration into existing control panels, and the Siemens branding guarantees adherence to stringent quality and performance standards, ensuring consistent performance under heavy loads and prolonged use. Whether deployed in manufacturing plants, HVAC systems, or other industrial settings, the 3RB2-113-4SB0 delivers precise motor control, minimal energy loss, and a reliable solution for automation tasks where dependability is critical.

### **Pros and Cons of buying a Furnas Electric 3RB2-113-4SB0 (Siemens 3RB21134SB0) Circuit Breaker**

#### **Overview**

The **Furnas Electric 3RB2-113-4SB0** (compatible with Siemens 3RB21134SB0) is a **2-pole, 120/240V, 110A circuit breaker** designed for residential and light commercial electrical panels. It is part of the **Siemens 3RB2 series**, a popular choice for modern breakers with advanced trip characteristics.

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### **Pros**

1. **High Amperage Rating (110A)**

- Suitable for **large homes, high-power appliances, or commercial setups** requiring significant electrical load.

- Can handle **electric heaters, well pumps, or subpanels** without frequent tripping.

2. **Siemens 3RB2 Series Reliability**

- The **3RB2 series** is known for **durability and consistent performance**, with fewer issues compared to older breaker models.

- Siemens has a strong reputation for **quality and long-term reliability** in electrical components.

3. **Electronic Trip Mechanism**

- Unlike older **mechanical breakers**, this model uses an **electronic trip unit**, which provides **more precise overload protection** and reduces false tripping.

- Helps prevent **nuisance tripping** from minor surges or inrush currents.

4. **Compatibility with Modern Panels**

- Designed to fit **standard 4-inch breaker slots**, making it easy to install in **Siemens, Square D, or other NEMA 1/2 panels**.

- Works well in **subpanels and main service panels** where high-amperage protection is needed.

5. **Arc-Fault Protection (Optional)**

- Some variants in the **3RB2 series** offer **arc-fault circuit interrupter (AFCI) protection**, reducing fire risks from electrical arcs.

- (Note: Verify if this specific model includes AFCI check with the seller or manufacturer.)

6. **Easy Installation & Replacement**

- Standard **push-in or screw-terminal connections** make wiring straightforward.

- Can be a **direct replacement** for older breakers in the same slot.

7. **Wide Availability & Spare Parts Support**

- Siemens and Furnas are **widely distributed**, so finding replacements or accessories is easier than with niche brands.

- Many **electrical supply stores** stock this model.

---

### **Cons**

1. **Higher Upfront Cost**

- Compared to **generic or older breaker models**, this is a **premium-priced** unit.

- May cost **2-3 times more** than a basic 110A breaker from a lesser-known brand.

2. **Potential Compatibility Issues**

- While designed for **Siemens panels**, some **third-party panels** (especially older or non-standard ones) may have **fitment or electrical compatibility issues**.

- Always **check panel manual** before installation.

3. **Electronic Components Can Fail**

- The **electronic trip mechanism** (while more reliable than older models) can still **fail over time**, especially if exposed to **power surges or voltage spikes**.

- If the breaker **stays closed despite overload**, it may indicate a **faulty trip unit** requiring replacement.

4. **Limited Physical Durability**

- Some users report that the **plastic housing is less sturdy** than metal-clad breakers, making it more prone to **dents or cracks** if the panel is frequently accessed.

- Not ideal for **industrial or high-vibration environments**.

5. **Requires Proper Installation**

- **Improper wiring or loose connections** can lead to **overheating or failure**.

- If installing in a **subpanel**, ensure the **neutral and ground bonding** follows **NFPA 70 (NEC) codes** to avoid issues.

6. **Potential for False Tripping (Rare but Possible)**

- While electronic trip units reduce false trips, **extreme inrush currents** (e.g., from large motors) or **power quality issues** could still cause unexpected disconnections.

7. **Not GFCI or AFCI (Standard Model)**

- The **basic 3RB2-113-4SB0 does not include GFCI or AFCI protection** these require **additional modules** if needed.

- If **GFCI protection is mandatory** (e.g., for outdoor or bathroom circuits), a separate GFCI breaker must be used.

---

### **Conclusion**

The **Furnas Electric 3RB2-113-4SB0 (Siemens 3RB21134SB0)** is a **high-quality, reliable choice** for applications requiring **110A protection** in **residential or light commercial settings**. Its **electronic trip mechanism, Siemens-backed reliability, and compatibility with modern panels** make it a **strong upgrade** over older mechanical breakers.

However, the **higher cost, potential electronic failure risks, and need for careful installation** mean it is **not the best budget option**. If **budget is a concern**, a **reputable generic 110A breaker** (e.g., from Square D or Cutler-Hammer) may suffice for basic use.

For **high-demand applications (electric heaters, subpanels, or commercial use)**, this breaker **excels in performance and longevity**, justifying its price.

---

### **Recommendation**

You need a **reliable, high-amperage breaker** for a **large home, subpanel, or commercial setup**.

You prefer **Siemens/Furnas quality** and are willing to pay for **advanced trip technology**.

Your **electrical panel is Siemens-compatible**, and you want **minimal false tripping**.

You plan to **future-proof** your electrical system with **easy replacement options**.

You are on a **tight budget** consider a **lower-cost generic 110A breaker** instead.

Your **panel is non-standard**, and compatibility is uncertain.

You need **GFCI or AFCI protection** this model does not include them by default.

You are installing in a **high-vibration or industrial environment** where physical durability is critical.

For most **residential high-load applications**, this is a **solid, long-term investment**. If you prioritize **reliability and performance over cost**, it is a **highly recommended choice**. However, **verify panel compatibility and installation requirements** before purchasing to ensure optimal performance.

Details:

Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. 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. Call to use a shipping service other than the ones listed.

part #: 3rb21134sb0 prices

• $89.95-$547.84

specifications automationjack:

• brand: Furnas Electric Co
• mpn: 3rb2-113-4sb0

returns automationjack:

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

payments automationjack:

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

general automationjack:

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

offer automationjack:

• quantity: 1
• started: April 12, 2026
• availability: In Stock
• sold: 0
• options: Ship-to-home

shipping automationjack:

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

seller automationjack:

• city: 1 Millennium Dr, Willingboro, NJ 08046
• rating: 99.6%
• # reviews: 1990 85

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