Siemens AG 5SY4 311-7 Miniature Circuit Breaker

Siemens AG 5SY4 311-7 is a three-pole miniature circuit breaker from the Siemens 5SY4 protection family, rated for 5 amperes. It provides overload and short-circuit protection for three-phase circuits in low-voltage distribution panels, helping prevent damage to conductors and connected equipment. The 5SY4 family supports multiple-pole configurations up to four poles, and in three-pole installations the series is rated for voltages up to 480 V AC, making it suitable for 3-phase industrial or commercial systems that require a compact, reliable protective device with a 5 A rating. The 311-7 variant identifies the specific model within the 5SY4 lineup, ensuring compatibility with Siemens protection blocks and common panelboard assemblies used in 3-phase installations. This device interrupts all three poles simultaneously under fault conditions, providing coordinated disconnection to minimize damage and maintain system safety. When selecting a protective device, ensure the circuit conductor sizing and load match the 5 A rating and the installation's voltage and phase configuration. This 5SY4 311-7 offers a precise, three-pole solution for applications where a 5 A protection level is required in 3-phase systems.