High amperage DC hydraulic-magnetic circuit breakers providing reliable circuit protection at ambient operating temperatures ranging from -40^o F to 153^o F. Typical uses include battery disconnects and overcurrent protection for inverters and other system components.The F frame breakers are manufactured by AIRPAX and Eaton-Heinemann.  The GJ-H3 has been the popular style of the F-Frame breakers since it is the main breaker used in the Xantrex DC Disconnect enclosure in either the 175 or 250 amperage.  The GJ-B3 is becoming more popular since it is the large inverter/battery disconnect  breaker used in Outback Power products.  Specifically the GJ-B3 is used in the Outback PSDC and PSR in the 175 and 250 amperage.