This rating shows how much current the main busbar can carry without issues. Typical ratings include 800 A, 1250 A, 2000 A, 2500 A, 3150 A, and 4000 A. For special uses, it can go up to 5000 A. The higher the. Typical ANSI/NEMA (American National Standards Institute, National Electrical Manufacturers Association) switchgear is rated for up to 635 volts with a continuous current main bus rating of up to 10,000 amps (for supplying power from parallel sources). Low-voltage switchgear is often found on the. Interrupting current constant for all voltages less than the maximum voltage. Rated voltage range factor k=1. 5 cycle breakers available at the same %dc ratings Back to back capacitor switching rating is good for 1200, 2000, 3000. This specification describes the metal-enclosed air insulated medium voltage switchgear for indoor applications (i) transformer feeders, (ii) motor starters, (iii) capacitor feeders and (iv) other distribution incoming/outgoing feeders as required for this project as set out in the data sheets and. In the design and operation of power distribution systems, Medium Voltage (MV) switchgear must withstand rigorous challenges under various current conditions.