The N-frame OPTIM Series C circuit breaker (Figure
1-1) types ND, HND, and NDC are 600 VAC maximum
rated devices with Digitrip OPTIM Models 550, 750 or
1050 trip units rated 800A or maximum continuous

current. They are for AC applications only and can
be reverse fed. They are listed in accordance with
Underwriters Laboratories, Inc. Standard UL 489 and
satisfy the requirements of International Electrotechnical
Commission Recommendations No. IEC OPTIM
750 and 1050 N-Frame circuit breakers are equipped
with zone interlocking and an auxiliary switch and alarm
switch for customer usage. Other internal accessories

are available but must be factory
installed since they are factory sealed. Model 550 is not
sealed and can accommodate field installed accessories,

 including an communications kit.

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