The J-frame Series C circuit breaker (Figure 1-1) types JD, JDB, HJD, and JDC are 600 Vac maximum rated devices with inter changeable thermal-magnetic trip units rated 250A maximum continuous current. Circuit breaker types JW, HJW, and JWC are 660 Vac maximum rated devices using interchangeable adjustable thermal/adjustable magnetic or electronic trip units rated up to 250A continuous current. Agency advantages supply the following brands: ①Allen-Bradley( Rockwell Automation)Series ②Square D(Schneider Electric) Series ③Eaton - Cutler Hammer (Westinghouse )Series ④SIEMENS PLC Series,Siemens CNC system ⑤Eaton moller Series