# Siemens 3RV2021-4AA20 Motor Circuit Breaker, 11-16A, Size S0

**URL:** https://aio.lv/en/product--siemens-3rv20214aa20--1802950
**Data updated:** 2026-05-18 02:44 (EEST)
**Category:** Power Sockets
**Manufacturer:** Siemens
**Manufacturer code:** 3RV20214AA20
**EAN:** 4011209724426
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

The Siemens 3RV2021-4AA20 is a high-performance motor circuit breaker designed for reliable protection of electric motors. Featuring a thermal-magnetic release, it covers an adjustment range of 11 to 16A. This size S0 device is engineered for industrial applications, providing effective short-circuit and overload protection. It ensures safe operation and longevity for motor control systems in various electrical installations.

## Long description

The Siemens 3RV2021-4AA20 is a robust motor circuit breaker engineered to provide dependable protection for electric motors in demanding industrial environments. This device features a thermal-magnetic release mechanism that effectively monitors current flow, ensuring that motors are shielded against both short-circuits and thermal overloads. Designed with a compact S0 size, it integrates seamlessly into motor control centers and electrical cabinets, offering a reliable solution for maintaining the operational integrity of machinery.
Advantages
This motor circuit breaker stands out due to its high precision in current detection and its ability to withstand harsh industrial conditions. The thermal-magnetic release provides a dual-layer of safety, reacting quickly to short-circuit events while preventing damage from sustained overcurrents. Its standardized S0 design allows for space-efficient installation, making it an ideal choice for modern electrical systems where panel space is at a premium. The device is built for longevity, ensuring consistent performance and reduced downtime for critical motor-driven applications.
Suitable for
Industrial motor control systems
Protection of three-phase induction motors
Electrical distribution panels
Automation and manufacturing equipment
HVAC system motor protection
When it may not be suitable
This device is specifically calibrated for motor protection within the 11 to 16A range and is not suitable for applications requiring higher current ratings or different protection characteristics, such as standard residential lighting circuits. It should not be used in environments that exceed its specified environmental operating temperature or ingress protection ratings.
Key specifications
Adjustment range: 11 to 16A
Size: S0
Release type: Thermal-magnetic
Protection functions: Short-circuit and overload protection
Phase count: 3-pole
How to use
The device is designed for mounting on standard DIN rails within an electrical enclosure. Installation should be performed by a qualified professional in accordance with local electrical codes. Once mounted, the current setting dial on the front of the unit must be adjusted to match the full-load current rating of the connected motor. After wiring the power input and motor output terminals, the breaker can be manually switched on or off using the front-facing toggle.
What to consider before purchase
Verify that the motor's full-load current falls within the 11-16A range.
Ensure the S0 size is compatible with your existing panel layout.
Confirm that the installation environment meets the technical requirements for this device.
Usage recommendations
Regularly inspect the terminal connections for tightness and ensure the device is free from dust or debris to maintain optimal thermal performance. Periodically test the trip mechanism to ensure continued operational safety.

## FAQ

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Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Siemens products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Siemens service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

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