This circuit breaker is a top-of-the-line commercial grade product from Ryefield Electric. It has a maximum amperage of 100 kA and a current rating of 400V, making it perfect for a variety of applications. The SPD-TPN/2TNF Type 2 Surge Arresters are designed with built-in fuses to provide comprehensive protection against surges and short circuits. With 3 phases and a voltage rating of 400V, this circuit breaker is a reliable choice for any business or industrial setup. It offers SPD protection with a protective fuse built into it, ensuring that your equipment is safe from surges and short circuits. Whether you're looking to upgrade your circuit or seeking a replacement for your old circuit breaker, this Ryefield Electric product is a great choice.