Siemens HHFD Series circuit breakers are designed to protect industrial machinery and equipment from damages caused by short-circuit and overload occurrences. These UL-listed breakers come with a molded case to hold the current-carrying components, trip devices and other mechanisms within a compact space. The thermal-magnetic trip mechanism of these devices overrides mild current overloads but instantly responds to heavy fluctuations for user safety. They further come with a bolt-on mounting facility to offer compatibility with panelboards and switchboards. Choose from a wide range of these Siemens circuit breakers available in current ratings ranging from 110 to 250A, on Raptor Supplies.