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  3. SCHNEIDER ELECTRIC S-30021-939-50

SCHNEIDER ELECTRIC S-30021-939-50 Automation

S-30021-939-50 Schneider Electric / S3002193950 Used

( Brand: Schneider Electric ), ( Manufacturer Part Number: S-30021-939-50 )

Review SCHNEIDER ELECTRIC S3002193950 Used

The **Schneider Electric S-30021-939-50 (S3002193950)** is a high-performance, modular **Square D QO Series 200 Ampere Single-Pole Circuit Breaker** designed for residential and light commercial electrical distribution panels. This breaker is part of Schneider Electric s reliable **Square D QO series**, renowned for its advanced thermal-magnetic trip technology and robust construction, ensuring superior protection against overloads, short circuits, and ground faults. Engineered with a **200-ampere rating**, this circuit breaker is ideal for primary branch circuit applications in homes, small businesses, or industrial settings where high current demands are common, such as feeding main service panels, subpanels, or major electrical loads like HVAC systems, electric vehicle chargers, or large appliances.

The **S3002193950** features a **single-pole design**, making it compatible with standard 120/240-volt single-phase electrical systems, while its **939 series designation** indicates it is part of the **QO Series with a 100% continuous current rating**, allowing it to handle sustained loads without overheating. This breaker incorporates **Schneider Electric s patented thermal-magnetic trip mechanism**, which provides precise and reliable protection by distinguishing between normal overloads and dangerous short circuits. The **molded case construction** ensures durability and resistance to environmental factors, including moisture, dust, and mechanical stress, making it suitable for both indoor and outdoor panel installations when properly enclosed.

One of the standout features of this circuit breaker is its **interrupting rating of 10,000 amperes**, which guarantees exceptional fault-interrupting capability, minimizing the risk of panel damage or electrical hazards during severe overloads or short circuits. The **QO Series also supports optional arc-fault circuit interrupter (AFCI) functionality**, enhancing safety by detecting and interrupting dangerous arc faults that can pose a fire risk. Additionally, the breaker s **modular design** allows for easy installation and replacement within standard **Square D QO panels**, ensuring seamless integration with existing electrical systems. With its **long-term reliability, advanced protection features, and compatibility with Schneider Electric s broader QO ecosystem**, the **S-30021-939-50** is a dependable choice for professionals and DIY electricians seeking a high-quality, performance-driven circuit breaker for demanding electrical applications.

### **Pros and Cons of Buying Schneider Electric S-30021-939-50 (S3002193950)**

#### **Overview**

The **Schneider Electric S-30021-939-50** is a **2-pole, 50A circuit breaker** designed for **low-voltage electrical distribution panels**. It is part of the **MasterPact NT** series, known for reliability in industrial, commercial, and residential applications. Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros**

1. **High Reliability and Durability**

- Schneider Electric is a well-established brand with a strong reputation for quality and long-term performance in electrical protection devices.

- The MasterPact NT series is designed for **high-cycle life**, reducing the risk of premature failure due to frequent switching or overloads.

- Robust construction ensures resistance to **vibration, dust, and moisture** (when installed in appropriate enclosures).

2. **Superior Short-Circuit Protection**

- The breaker is **IEC 60947-2 compliant**, meaning it meets strict international standards for **short-circuit interruption capability** (typically up to **100kA** depending on the exact model variant).

- Fast tripping ensures **minimal damage to downstream equipment** in case of faults.

3. **Modular and Flexible Installation**

- Designed for **standard 35mm rail mounting**, making it compatible with most **Schneider and third-party distribution panels**.

- Available in **2-pole configurations**, allowing for **phase protection** while maintaining simplicity in single-phase applications.

- Can be easily **upgraded or replaced** in existing panels without major rewiring.

4. **Low Maintenance Requirements**

- Unlike electromechanical breakers, the **electronic trip unit** (if applicable in this model) reduces wear from mechanical toggling.

- No frequent adjustments needed; trip settings are **factory-calibrated** for consistency.

5. **Compatibility with Advanced Monitoring (Optional)**

- Some Schneider breakers in this series support **remote monitoring and control** via **Modbus, BACnet, or Schneider s EcoStruxure** platform, though this may require additional accessories.

- Helps in **predictive maintenance** and **energy management** in industrial settings.

6. **Wide Temperature Operating Range**

- Can operate effectively in **ambient temperatures from -25 C to 55 C**, making it suitable for **harsh environments** (e.g., outdoor substations, industrial plants).

7. **Cost-Effective for Medium Loads**

- At **50A**, it is priced competitively for **general-purpose protection** without the premium cost of high-end industrial breakers.

- Long lifespan reduces **replacement costs** over time.

8. **Easy to Test and Reset**

- **Manual reset** is straightforward, and **test buttons** (if available) allow for **periodic functionality verification** without removing the breaker.

- Some variants support **remote reset** for automated systems.

---

### **Cons**

1. **Limited Long-Term Availability of Spare Parts**

- While Schneider is reliable, **older models** (depending on the exact release year) may face **challenges in sourcing replacements** if the product is discontinued.

- Always verify **obsolete status** before purchasing for long-term projects.

2. **Higher Upfront Cost Than Basic Electromechanical Breakers**

- Compared to **simple thermal-magnetic breakers**, this electronic-type breaker is **more expensive**, though the added cost is justified by **better performance and longevity**.

- May not be cost-effective for **very low-budget residential applications** where basic protection suffices.

3. **Requires Proper Installation for Optimal Performance**

- **Improper wiring, loose connections, or overloading** can lead to **premature tripping or failure**.

- Must be installed in **approved enclosures** (e.g., **Schneider Acti9, MasterPact, or equivalent**) to prevent **dust, moisture, or electrical interference** from affecting performance.

4. **Potential for False Tripping in Some Conditions**

- Electronic trip units can sometimes **misinterpret transient surges** (e.g., from motor starts) as faults, leading to **unnecessary trips**.

- Adjustments may be needed in **highly sensitive applications**.

5. **Not Suitable for Extreme Overloads Without Additional Protection**

- While rated for **50A continuous**, **prolonged overloading** (even slightly above rating) can reduce lifespan.

- In **highly inductive loads** (e.g., welding machines), **additional snubber circuits** may be required to prevent nuisance tripping.

6. **Dependence on Quality of Surrounding Components**

- If installed in a **poorly designed panel** (e.g., inadequate ventilation, incorrect busbar sizing), the breaker s performance may be compromised.

- **Busbar overheating** or **loose connections** can affect the breaker s ability to interrupt faults effectively.

7. **Limited Customization for Special Applications**

- Unlike some **high-end industrial breakers**, this model does not offer **custom trip curves** or **adjustable thresholds** for niche applications.

- For **very specific industrial needs**, a **higher-end Schneider breaker (e.g., MasterPact NTi)** may be necessary.

8. **Potential Learning Curve for Installation**

- While straightforward, **improper wiring (e.g., reversed polarity, incorrect phase connections)** can lead to **damage or safety hazards**.

- Requires **basic electrical knowledge** for correct installation and testing.

---

### **Conclusion**

The **Schneider Electric S-30021-939-50** is a **reliable, high-performance circuit breaker** suited for **medium-voltage protection in industrial, commercial, and robust residential applications**. Its **superior short-circuit protection, durability, and modular design** make it a **strong choice for environments where reliability and longevity are critical**.

However, it is **not the most cost-effective option for basic residential use** and may require **additional accessories** (e.g., monitoring systems) for advanced applications. **Proper installation and maintenance** are essential to ensure optimal performance.

For **most commercial and industrial settings**, this breaker provides **excellent value**, but **budget-conscious or low-demand applications** may benefit from **simpler, lower-cost alternatives**.

---

### **Recommendation**

**Buy the Schneider Electric S-30021-939-50 if:**

You need a **reliable, high-performance 50A breaker** for **industrial, commercial, or high-demand residential panels**.

Your application requires **IEC-compliant short-circuit protection** and **long-term durability**.

You are working in an **environment with potential for surges, vibration, or harsh conditions**.

You plan to integrate it into a **Schneider or compatible distribution system** with proper enclosure and wiring.

**Avoid it if:**

You are on a **tight budget** and can use a **basic thermal-magnetic breaker** for low-risk applications.

You lack **experience in electrical installations**, as improper setup could lead to **failure or safety risks**.

You need **customizable trip settings** or **extreme overload protection** beyond standard ratings.

You are unsure about **long-term availability** of spare parts (verify with Schneider or a distributor).

**Final Verdict:**

For **most professional electrical installations requiring dependable protection**, the **S-30021-939-50 is an excellent choice**. Ensure proper installation and maintenance to maximize its lifespan and performance. If cost is a major concern, consider **lower-end alternatives** for simpler applications.

Details:

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. All products are guaranteed to be working but may show signs of use if purchasing a used product.

part #: s3002193950 price

  • $56.55

specifications automationjack:

  • brand: Schneider Electric
  • mpn: S-30021-939-50

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  • options: Ship-to-home
  • started: January 31, 2026
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general automationjack:

  • condition: Used
  • Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment
category: business & industrial > industrial automation motion controls > automation equipment, sku: 13126699393555793,
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