Siemens QS Series circuit breakers are best suited for use in panelboards, industrial enclosures, busway plug-in units, switchboards and motor control centres for protection against short-circuit conditions and current overloads. These devices feature a thermal magnetic trip unit offering long-time and instantaneous current limiting protection and plug-in configuration which comfortably mounts into all kinds of panelboards. Choose from a wide range of these circuit breakers available in 10, 22 and 42kA interrupt ratings on Raptor Supplies.