1. Automation/Motion Controls For Sale
  2. sku: 15800834566312773
  3. SIEMENS 5SY4204-8

SIEMENS 5SY4204-8 Circuit Breaker 2P 480V 4A

5sy4204-8 Siemens Circuit Breaker 2p 480v 4a

( Brand: Siemens ), ( Manufacturer Part Number: 5SY4204-8 ), ( Part Type: Circuit 480v Breaker ), ( Country Of Origin: United States )

Review SIEMENS Circuit Breaker 2p 480v 4a

The **Siemens 5SY4204-8** is a high-performance, two-pole (2P) circuit breaker designed for medium-voltage applications, offering reliable protection and efficient operation in industrial, commercial, and critical infrastructure settings. Part of Siemens robust **5SY** series, this compact yet powerful device is engineered to safeguard electrical circuits against overloads, short circuits, and other abnormal conditions, ensuring the longevity of downstream equipment while minimizing downtime. With a rated voltage of **480V AC**, it is well-suited for three-phase systems commonly found in manufacturing plants, data centers, and large-scale facilities where consistent power integrity is paramount. The **4A** nominal current rating positions it as a low-interruption device, ideal for applications requiring precise current monitoring without excessive tripping, such as control panels, motor starters, or sensitive electronic systems where minimal power disruption is critical.

Constructed with Siemens signature attention to durability and precision, the **5SY4204-8** features a **vacuum interrupter technology** for superior arc quenching, reducing wear and tear while extending the breaker s operational lifespan. Its modular design allows for easy integration into existing electrical panels, offering flexibility in installation and maintenance. The device incorporates advanced **electromagnetic and thermal trip mechanisms**, ensuring rapid and accurate response to fault conditions while maintaining selectivity in multi-level protection schemes. Additionally, its **compact footprint** and standardized mounting dimensions make it a space-efficient solution for crowded control environments, where every inch counts.

Beyond its technical robustness, the **5SY4204-8** is engineered with user-centric features, including a **clear status indicator** for immediate fault detection and a **mechanical latch** for secure operation. Siemens commitment to safety is evident in its compliance with international standards, including **IEC 62271-100** and **NEMA ICS-R**, ensuring it meets stringent requirements for electrical safety and performance. Whether deployed in a mission-critical facility or a high-demand industrial setting, this circuit breaker delivers dependable protection, operational reliability, and seamless integration making it an indispensable component for maintaining electrical system integrity in demanding environments.

### **Pros and Cons of buying a Siemens 5SY4204-8 (2P, 480V, 4A) Circuit Breaker**

#### **Pros:**

1. **Reliability and Brand Reputation** Siemens is a well-established manufacturer known for high-quality electrical components. Their circuit breakers are designed for durability and consistent performance in industrial and commercial applications.

2. **Precision Current Rating** The 4A rating ensures it is suitable for low-current applications where overcurrent protection is critical without unnecessary tripping. This makes it ideal for sensitive electronics, control panels, or small motor circuits.

3. **Compact and Space-Efficient Design** The 5SY series is part of Siemens modular range, which is designed to fit neatly into standard electrical panels, reducing installation space requirements.

4. **Electronic Trip Mechanism** This model likely features an electronic trip unit, which provides more accurate and adjustable protection compared to magnetic-only breakers. It can be programmed for specific overcurrent thresholds, reducing false trips while still protecting the circuit.

5. **Compatibility with Siemens Systems** If the installation already uses Siemens components, this breaker will integrate seamlessly with existing wiring, control systems, and monitoring solutions.

6. **Long Lifespan** Siemens circuit breakers are built to withstand frequent switching cycles without degradation, making them cost-effective in the long run.

7. **Safety Features** The breaker includes protection against short circuits and overcurrents, helping prevent equipment damage and fire hazards.

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#### **Cons:**

1. **Higher Upfront Cost** Compared to generic or lower-end brands, Siemens circuit breakers are more expensive. For very low-budget applications, this may not be justified.

2. **Limited Availability of Replacement Parts** While Siemens is reliable, finding replacement parts or compatible accessories (e.g., trip units) may be more challenging than with more common brands.

3. **Overkill for Simple Applications** A 4A breaker is extremely low in current rating. If the application only requires basic protection (e.g., a small lighting circuit), a simpler, less expensive breaker (e.g., a thermal-magnetic type) might suffice.

4. **Potential for Overcomplication** The electronic trip mechanism, while precise, adds complexity. If the user lacks experience with electronic trip units, troubleshooting may be more difficult than with a traditional breaker.

5. **Voltage and Current Mismatch Risk** At 480V, this breaker is designed for higher voltage systems. If the actual system voltage is significantly lower (e.g., 240V), the breaker may still function but could be overrated for the application, leading to inefficiency.

6. **Installation Complexity** Electronic trip units require proper wiring and calibration. Incorrect setup could lead to malfunctions or failure to trip when needed.

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### **Conclusion**

The **Siemens 5SY4204-8** is an excellent choice for **precision overcurrent protection in low-current, high-reliability applications**, particularly in industrial or commercial settings where Siemens compatibility is desired. Its electronic trip mechanism ensures accurate protection, reducing the risk of equipment damage from overcurrents. However, for **basic residential or very low-cost applications**, a simpler, less expensive breaker may be more practical.

### **Recommendation**

- **Buy this breaker if:**

- You need **high-precision overcurrent protection** in a Siemens-compatible system.

- The application involves **sensitive electronics or critical control circuits** where false tripping must be minimized.

- You are working in an **industrial or commercial environment** where reliability and brand reputation are priorities.

- **Consider alternatives if:**

- The application is **simple and low-cost**, and a basic thermal-magnetic breaker would suffice.

- You are unsure about **installation or calibration** of electronic trip units.

- The **current rating is too low** for the intended load, and a higher-rated breaker (e.g., 6A or 10A) would be more appropriate.

For most **residential or small commercial uses**, a **generic 4A or 6A breaker** (e.g., from Cutler-Hammer, Square D, or a trusted local brand) may offer similar protection at a lower cost. However, if **long-term reliability, integration with Siemens systems, and precise trip characteristics** are critical, this Siemens breaker is a strong investment.

Details:

CIRCUIT BREAKER, 4A, 2 POLE, 480V. 5SY4204-8: USED IN GOOD WORKING CONDITION. Bin # PPTC3B ML.

part #: 5sy42048 prices

  • $18.00-$140.00

specifications automationjack:

  • brand: Siemens
  • mpn: 5sy4204-8
  • part type: Circuit 480v Breaker
  • country of origin: United States

shipping automationjack:

  • class: Economy
  • cost: $0.00
  • transit: 4-8 Days
  • type: Fixed
  • service: Economy

offer automationjack:

  • quantity: 1
  • sold: 0
  • best offers: True
  • started: May 27, 2026
  • options: Ship-to-home
  • availability: In Stock

seller automationjack:

  • rating: 100.0%
  • city: Greenville, South Carolina
  • # reviews: 7587

payments automationjack:

  • wallet: Apple-pay
  • other
  • credit card: Mastercard

general automationjack:

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

returns automationjack:

  • paid by: Buyer
  • time: 30 Days
  • method: Money back
  • policy: Returns Accepted
part type: circuit 480v breaker, country of origin: united states,
category: business & industrial > industrial automation motion controls > automation equipment, sku: 15800834566312773,
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