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Systems that use batteries as a power source, such as an uninterruptible power supply (UPS), require special consideration when specifying overload protection. PowerPact 500 Vdc molded case circuit breakers are designed per UL Supplement SC for use in an ungrounded dc system using an uninterruptible power supply (UPS), with a nominal voltage of 500 Vdc or a maximum (floating) voltage of 600 Vdc.