5SY8663-8 SIEMENS

The 5SY8663-8 is a miniature circuit breaker (MCB) manufactured by Siemens, designed for reliable circuit protection in residential, commercial, and industrial applications. This MCB is a 3P+N (three-pole plus neutral) device, meaning it protects three phase lines and a neutral line. It has a D-curve tripping characteristic, making it suitable for circuits with high inrush currents, such as those found in inductive loads like motors and transformers. The MCB is rated for a maximum voltage of 400V AC and has a breaking capacity of 25kA according to EN 60947-2, ensuring it can safely interrupt high fault currents. Its compact design, with a depth of 70mm, allows for easy installation in standard distribution boards and consumer units. The D63 designation indicates a rated current of 63A, meaning it will trip if the current exceeds this value. This MCB provides reliable protection against overloads and short circuits, preventing damage to equipment and reducing the risk of electrical fires. Siemens MCBs are known for their quality, durability, and compliance with international standards, ensuring safe and reliable operation. It is suitable for various applications requiring robust circuit protection.