UL standards are used in North America as well as in several other countries. this is of particular importance to European exporters of electrical switchboard assemblies and equipment for machines who export to the USA, as their products will only be accepted if they meet the relevant UL standards. A wide range of low voltage circuit protection devices from Siemens comply with UL standards and are therefore suitable for implementation worldwide in both IEC/EN and UL applications within the framework of their specified use. miniature circuit breakers certified to UL 489 permit use as an all-round solution for protection tasks in distribution boards, control cabinets and control systems to UL 508A as "branch protectors". in particular, they are also approved for the protection of electrical circuits in heating, ventilating and cooling systems (HVAC), as well as for DC applications up to 60/125 VAC. this covers a wide range of protection tasks, in residential and non-residential buildings, as well as in industry. the tripping characteristics B, C and D to EN/IEC 60898-1 have been adapted so that they fall in the permissible tripping range according to UL 489, as well as for applications at 25 deg C and 40 deg C. this means that the devices are approved for use according to both standards. the enclosure dimensions of the devices correspond to DIN format. this means that the device series are suitable for universal use worldwide according to IEC or UL standards.