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Siemens 3RV2021-4AA25 S0 Breaker with Aux Contacts

Siemens 3RV2021-4AA25 S0 motor protection circuit breaker with aux contacts.

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ManufacturerSiemens

Part number3RV2021-4AA25

Size S0

Trip Class CLASS 10

Adjustable Current 10-16 A

Fixed Current 208 A

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Motor protection CLASS 10 rating Integrated auxiliary switches (1 NO/1 NC) Spring-type terminals Size S0 Standard switching capacity

Product description

The Siemens 3RV2021-4AA25 is a size S0 motor protection circuit breaker offering robust protection for motors. It features a CLASS 10 thermal release adjustable from 10-16A and a 208A magnetic trip. This unit is equipped with spring-type terminals for quick installation and includes transverse auxiliary switches (1 NO + 1 NC) for enhanced control and signaling capabilities.

This circuit breaker is widely used in industrial settings to protect motors from overloads and short circuits. Its suitability extends to automation systems, control panels, and various types of machinery where reliable motor operation and status feedback are required.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 3RV2021-4AA25. We guarantee quality components at competitive prices, backed by fast shipping and excellent customer service, ensuring your operational continuity.

Technical specifications

Size	S0
Trip Class	CLASS 10
Adjustable Current	10-16 A
Fixed Current	208 A
Terminal Type	Spring-type
Switching Capacity	Standard
Auxiliary Contacts	1 NO + 1 NC

Common applications

Motor control

Industrial automation

Control panels

Machine protection

Conveyor systems

Factory automation

Compatible systems

Siemens Sirius 3RV2 series

Also known as

Siemens 3RV2021-4AA25 breaker Siemens S0 breaker with aux contacts 3RV20214AA25 Siemens

Replaces / compatible with

This part is a Siemens 3RV2021-4AA25. For specific replacement guidance, please refer to the manufacturer's technical documentation.

Technical note

Expert tip

The spring-type terminals on the 3RV2021-4AA25 are designed for tool-free installation, allowing for faster setup and maintenance in industrial environments.

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Frequently asked questions

What is the purpose of the 1 NO + 1 NC auxiliary contacts on the 3RV2021-4AA25?

The auxiliary contacts on the Siemens 3RV2021-4AA25 (1 NO, 1 NC) are used to provide status feedback to control systems or PLCs, indicating whether the main circuit breaker is tripped or closed, and can also be used for interlocking purposes.