The Siemens compact circuit breaker 3VA2225-6JQ42-0AA0 belongs to the SENTRON 3VA2 series and is designed for use in low-voltage switchgear. It is a 4-pole circuit breaker with a rated current of 250 A and a breaking capacity of 85 kA at 415 V. The ETU560 tripping unit provides LSIG protection functions, including overload, short-circuit, selective short-circuit, and earth fault protection. The breaker is suitable for fixed mounting as well as plug-in and withdrawable applications and features a screw flat connection. Its modular design allows for flexible adaptation to different requirements through a unified accessory system.

Applications
This circuit breaker is intended for use in industrial and commercial electrical installations where safe and reliable system protection is required. It protects electrical systems against overloads and short circuits and ensures disconnection in case of faults. The 4-pole configuration makes it particularly suitable for systems with a neutral conductor, where neutral conductor protection is adjustable (OFF to 100 %). The integrated earth fault protection can be switched off and offers a protection range of 0.2 to 1 x In with a response time of 0.05 to 0.8 seconds.

Functions and Features in Detail
The electronic tripping unit ETU560 enables precise adjustment of protection functions. The overload protection (L) is adjustable in the range of 100 A to 250 A. The short-circuit protection (S) is defined by the setting value Isd from 0.6 to 10 x In and the tripping current Ii from 1.5 to 10 x In. The selective short-circuit protection function (I) ensures targeted disconnection under selective fault conditions. The integrated earth fault protection (G) can be optionally activated or deactivated. The breaker is designed for use in IEC frame 250 and offers a high switching capacity class H.

Technology Explained Simply
The breaker operates as a Molded Case Circuit Breaker (MCCB) and is designed for use in low-voltage switchgear. The 4-pole design protects all conductors, including the neutral conductor, whose protection can be configured via a separate setting (OFF to 100 %). The ETU560 tripping unit enables electronic control of protection functions, allowing precise adaptation to the specific installation. The screw flat connections provide a secure and robust connection to the conductors.

Compatibility and Accessories
Accessories for the 3VA2225-6JQ42-0AA0 are modular and uniformly designed for the entire 3VA2 series. Various components can be added, such as cylinder locks (3VA9980-0VL10), DIN rail extensions (3VA9987-0GL30), auxiliary switches (e.g., 3VA9988-0AA11, 3VA9988-0AA12, 3VA9988-0AA13), time delay devices (e.g., 3VA9988-0BF22, 3VA9988-0BF23), voltage release units (3VA99880BM10), signaling switches (e.g., 3VA9988-0AB22, 3VA9988-0AB12, 3VA9988-0AB13), interlocking devices (3VA9088-0VM30), cable pull rods (e.g., 3VA9980-0VC30, 3VA9980-0VC20), and rear interlocks (e.g., 3VA9088-0VK10, 3VA9088-0VM10). These components extend the functionality of the breaker, for example, for mechanical interlocking, status indication, or remote control.

Mounting and Installation
The breaker is designed for fixed mounting as well as plug-in and withdrawable applications. Installation is done via screw flat connections, ensuring a secure mechanical connection to the conductors. The modular design enables easy installation and maintenance. Accessories are added according to the requirements of the installation, taking into account the installation conditions of each component.

Operational Advantages
The breaker offers high reliability and safety thanks to its integrated protection functions. Its modular expandability allows flexible adaptation to different requirements. The ETU560 tripping unit ensures precise and reliable disconnection in case of faults. The 4-pole design with adjustable neutral conductor protection makes it particularly suitable for complex installations. The screw flat connections ensure a robust and durable connection.