In the context of molded case circuit breakers (MCCBs), the "400A frame size" refers to the physical size and configuration of the MCCB suitable for handling currents up to 400 amperes.

Here's what the "400A frame size" typically entails:

1. Rated Current (630A):
   • The "400A" designation indicates the maximum rated current capacity of the MCCB. This means the circuit breaker is designed to handle electrical loads with currents up to 400 amperes without tripping.
2. Frame Size:
   • The frame size of an MCCB represents its physical dimensions, including width, height, depth, and overall construction. A 400A frame size MCCB would have larger physical dimensions compared to smaller frame sizes, accommodating the higher current rating.

For an MCCB with a 400A frame size, the physical dimensions and configuration would be appropriate for use with electrical systems and loads requiring currents up to 400 amperes. This frame size typically offers higher breaking capacities and may have additional features compared to smaller frame sizes.

As with other MCCBs, it's essential to consult the manufacturer's documentation, datasheets, or product specifications for detailed information about the 400A frame size MCCB offered by a particular manufacturer. This ensures compatibility with specific application requirements and electrical systems.