1. Automation/Motion Controls For Sale
  2. sku: 15797250876312773
  3. SIEMENS 3RV1021-0KA15

SIEMENS 3RV1021-0KA15 Circuit Breaker 1.25A 3P

3rv1021-0ka15 Siemens Circuit Breaker 1.25a 3p

( Brand: Siemens ), ( Manufacturer Part Number: 3RV1021-0KA15 ), ( Part Type: Circuit Breaker ), ( Country Of Origin: United States )

Review SIEMENS Circuit Breaker 1.25a 3p

The **Siemens 3RV1021-0KA15** is a high-performance, three-pole (3P) miniature circuit breaker designed for reliable protection in low-voltage electrical installations, making it an ideal choice for both residential and light commercial applications. Part of Siemens trusted **3RV1** series, this compact yet robust device is engineered to safeguard electrical circuits from overcurrents, short circuits, and other fault conditions, ensuring the safety of connected equipment and preventing potential fire hazards. With a **1.25A** rated current, it is perfectly suited for protecting smaller branch circuits, such as those powering lighting systems, control panels, or sensitive electronic devices where precise current management is essential. The **3RV1** series is renowned for its **high interrupting capacity (10kA at 230V AC)**, which allows it to handle severe fault conditions with exceptional efficiency, minimizing downtime and reducing the risk of equipment damage.

Constructed with **high-quality materials**, including a durable molded case and precision-engineered internal components, the **3RV1021-0KA15** offers long-term reliability and resistance to environmental stressors such as moisture, dust, and temperature fluctuations. Its **compact and modular design** allows for easy installation in standard DIN rail enclosures, making it a space-efficient solution for panel builders and electrical contractors. The circuit breaker features a **thermal-magnetic trip mechanism**, which provides both **long-term overcurrent protection** (via thermal tripping) and **instantaneous short-circuit protection** (via magnetic tripping), ensuring optimal performance across a wide range of operating conditions. Additionally, its **low operating voltage (230V AC)** compatibility makes it versatile for use in standard European and global electrical systems.

Beyond its technical superiority, the **Siemens 3RV1021-0KA15** is designed with **user convenience in mind**, offering a **clear and intuitive trip indicator** that quickly alerts operators to fault conditions. The device also incorporates **Siemens advanced trip characteristic curve**, which balances sensitivity and selectivity, reducing unnecessary nuisance tripping while still providing robust protection. Whether integrated into a new installation or used for retrofitting existing systems, this circuit breaker delivers **consistent performance, extended service life, and peace of mind** for electrical engineers and end-users alike. With Siemens reputation for innovation and quality, the **3RV1021-0KA15** stands as a dependable choice for professionals seeking a reliable, high-performance protective device.

### **Pros and Cons of buying a Siemens 3RV1021-0KA15 Circuit Breaker (1.25A, 3P)**

#### **Pros:**

1. **Reliability and Brand Reputation** Siemens is a well-established manufacturer known for high-quality electrical components, ensuring durability and consistent performance in residential and light commercial applications.

2. **Standardized Compatibility** The 3RV1021 series is part of Siemens modular range, making it compatible with standard DIN-rail mounting systems and other Siemens circuit protection devices, simplifying panel integration.

3. **Overcurrent and Short-Circuit Protection** The 1.25A rating provides adequate protection for low-current circuits (e.g., lighting, small appliances, or control circuits), preventing damage from overloads or faults.

3. **Compact Design** The 3-pole (3P) configuration fits neatly into electrical panels, saving space while protecting three-phase or balanced single-phase circuits.

4. **Thermal-Magnetic Trip Mechanism** The built-in trip mechanism offers both thermal (long-term overload) and magnetic (short-circuit) protection, reducing the risk of fire or equipment damage.

5. **Easy Installation** Designed for straightforward mounting on DIN rails, with clear labeling and standard screw terminals for wiring.

6. **Long Lifespan** Siemens components are engineered for extended service life with minimal maintenance, reducing replacement costs over time.

7. **Compliance with Standards** Likely meets international safety standards (e.g., IEC, UL, or regional equivalents), ensuring legal compliance in most installations.

---

#### **Cons:**

1. **Limited Current Rating** A 1.25A breaker is suitable only for very low-power circuits (e.g., control wiring, sensors, or small lighting loads). For general household or high-power applications, higher-rated breakers (e.g., 16A, 25A) would be more appropriate, making this model underutilized in most cases.

2. **Potential Overkill for Simple Circuits** If the application is extremely low-power (e.g., a single LED strip or a small motor), a fuse or a cheaper, simpler protective device might suffice, reducing unnecessary complexity.

3. **Cost Relative to Use Case** For specialized or niche applications, the price of a Siemens breaker may not justify its use compared to alternatives like fuses or lower-cost brands.

4. **No Built-In Arc Fault Protection** Unlike some higher-end Siemens breakers, this model does not include arc fault protection, which is a safety feature required in certain residential wiring codes (e.g., NFPA 70 in the U.S.).

5. **Replacement Parts Availability** While Siemens parts are widely available, older or discontinued models may require sourcing from specialized distributors, potentially increasing costs or lead times.

6. **No Digital or Smart Features** This is a basic mechanical breaker without smart monitoring (e.g., remote tripping, digital diagnostics), which may be a drawback for modern, IoT-enabled electrical systems.

7. **Potential for Misapplication** Incorrect sizing (e.g., using a 1.25A breaker for a circuit requiring 10A ) could lead to nuisance tripping or inadequate protection, requiring careful circuit design.

---

### **Conclusion**

The **Siemens 3RV1021-0KA15 (1.25A, 3P)** is a **high-quality, reliable circuit breaker** suited for **low-current, specialized applications** such as control wiring, sensor circuits, or minimal lighting loads where precise protection is critical. Its strengths lie in **durability, brand trust, and modular compatibility**, but its **narrow current rating and lack of advanced features** make it impractical for most standard electrical installations.

For **general residential or commercial use**, higher-rated breakers (e.g., 16A 63A) would be more appropriate. However, if your application **strictly requires a 1.25A, 3-pole breaker** (e.g., for a specific industrial control system or low-voltage circuit), this Siemens model is a **solid, long-term choice** due to its reliability.

---

### **Recommendation**

- **Buy if:**

- You need a **low-current, 3-pole protective device** for a specialized circuit (e.g., control wiring, sensors, or minimal lighting).

- You prioritize **Siemens reputation for quality and longevity** over cost savings.

- Your installation requires **modular DIN-rail compatibility** with other Siemens components.

- **Avoid if:**

- You need a breaker for **standard household or high-power circuits** (opt for 16A 32A instead).

- Your budget allows for **simpler or cheaper alternatives** (e.g., fuses or basic breakers from other brands).

- You require **arc fault protection or smart monitoring features**.

- **Alternatives to Consider:**

- For **higher current needs**, explore Siemens **3RV2 or 3VA series** breakers.

- For **cost-sensitive applications**, check **ABB, Schneider Electric, or generic DIN-rail breakers** with similar ratings.

- If **low-voltage control circuits** are the focus, verify if a **fuse or a smaller-rated breaker** (e.g., 0.5A 2A) would suffice.

In summary, this breaker is **best for niche, low-power applications** where Siemens reliability is a priority, but it is **not ideal for general electrical work**. Always ensure the breaker s rating matches the circuit s actual load to avoid operational issues.

Details:

Bin # PPTC2B ML. 3RV1021-0KA15: USED IN GOOD WORKING CONDITION. CIRCUIT BREAKER, 1.25A, 3 POLE.

part #: 3rv10210ka15 prices

  • $40.50-$67.54

specifications automationjack:

  • brand: Siemens
  • mpn: 3rv1021-0ka15
  • part type: Circuit Breaker
  • country of origin: United States

offer automationjack:

  • started: May 26, 2026
  • sold: 0
  • quantity: 1
  • availability: In Stock
  • best offers: True
  • options: Ship-to-home

payments automationjack:

  • wallet: Google-pay
  • credit card: Discover
  • other

shipping automationjack:

  • transit: 3-8 Days
  • type: Fixed
  • class: Economy
  • cost: $0.00
  • service: Economy

general automationjack:

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

seller automationjack:

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

returns automationjack:

  • method: Money back
  • paid by: Buyer
  • policy: Returns Accepted
  • time: 30 Days
part type: circuit breaker, country of origin: united states,
category: business & industrial > industrial automation motion controls > automation equipment, sku: 15797250876312773,
Siemens 3RV1021-0KA15 Is Similar To:
automationjack logo
5 offers $40.50–$67.54 USD
  • Used. Offer #1 priced at $63.22 + $0.00 shipping estimate = $63.22* total. USED IN GOOD WORKING CONDITION. CIRCUIT BREAKER.FREE SHIPPING
  • Used. Offer #2 priced at $40.50 + $9.65 shipping estimate = $50.15* total. DISCONTINUED BY MANUFACTURER SIGMA Surplus is a division of SIGMA Group.+$9.65 shipping
  • Used. Offer #3 priced at $67.54 + $12.90 shipping estimate = $80.44* total. +$12.90 shipping
  • Used. Offer #4 priced at $70.61 + $36.20 shipping estimate = $106.81* total. +$36.20 shipping
  • Used. Offer #5 priced at $45.00 + $21.96 shipping estimate = $66.96* total. THIS ITEM WAS REMOVED UNDER WORKING CONDITIONS. SIRIUS CIRCUIT BREAKER for MOTOR PROTECTION.+$21.96 shipping

Copyright © automationjack.com