The 3VL9800-1UP00 is a circuit breaker manufactured by Siemens. It is a three-pole, one-position, no-load-break, vacuum circuit breaker that can be used as a main switch, in a circuit disconnect, or as a distribution switch in medium-voltage applications. It has an adjustable thermal and magnetic trip unit which can be used to set trip ranges of 0.1-0.9A or 0.1-20A with a breaking capacity of up to 31.5kA at 500V AC. The 3VL9800-1UP00 also features a wireless communication interface, a digital display, a timer function, and manual operation. It is a robust and reliable breaker with a high short-circuit interruption capacity.