In the context of Molded Case Circuit Breakers (MCCBs), the "100A" designation refers to the maximum rated current capacity of the circuit breaker, while "frame size" typically denotes the physical size and configuration of the MCCB. However, different manufacturers may use varying terminology for frame sizes.

Here's a general breakdown:

1. Rated Current (100A):
   • The "100A" indicates the maximum rated current capacity of the MCCB, which means the circuit breaker can handle electrical loads with currents up to 100 amperes.
2. Frame Size:
   • The frame size of an MCCB represents its physical dimensions, including the width, height, and depth, as well as the overall construction. Different frame sizes are designed to accommodate different current ratings and breaking capacities.

Given that you specifically mentioned a "100A MCCB frame size," it's likely you're inquiring about the physical dimensions and configuration of an MCCB designed to handle a maximum current rating of 100 amperes.

Specific frame size terminology can vary between manufacturers, so it's essential to refer to the manufacturer's documentation or datasheet for detailed information about the frame size corresponding to a 100A MCCB. The frame size typically determines the mounting requirements, accessories, and overall compatibility of the MCCB within an electrical distribution system.