Siemens 5SY4208-8 Two-Pole 400V Circuit Breaker

Siemens 5SY4208-8 is a SENTRON two-pole miniature circuit breaker designed for 230/400 V AC distribution. It delivers 8 A nominal current with a Type D (curve D) tripping characteristic, making it suitable for circuits with modest inrush like motor starters and contactor-controlled loads. The device is a DIN-rail-mountable MCB, part of the 5SY4 family, with dimensions 90 mm (height) × 36 mm (width) × 76 mm (depth) and a conductor connection range of 1–25 mm². It provides a high short-circuit breaking capacity: up to 10 kA according to EN 60898, up to 20 kA per IEC 60947-2, and a DC breaking capacity rated at 15 kA. The rated operating voltage is 400 V AC, with a DC rating of 60 V. The IP rating is IP20 when conductors are connected. The 5SY4208-8 supports quick assembly mounting on a standard DIN rail and is commonly used to protect individual branch circuits in control panels, switchboards, and other low-voltage electrical installations requiring reliable overcurrent protection.