Inverse time circuit breakers are pre-programmed to trip at common configurable settings and have both thermal and instantaneous trip characteristics. Trip Curve of MCB: The Trip Curve is a graphical representation of the circuit protection devices. Fuse, MCB’s, MCCB’s, supplementary protectors, motor protection circuit breakers, overload relays, electronic fuses, and air circuit breakers are all examples of circuit protection devices. The multiples of the current going through the miniature circuit breaker are represented on the horizontal X-axis. […] What is Auxiliary contact? Auxiliary contacts (or switches) are supplementary contacts that are added to a circuit to protect the main contact. This accessory allows you to check the status of a Miniature Circuit Breaker or Supplementary Protector from a remote. Simply explained, it aids in remotely determining whether the breaker is open or closed. This device can be used for a variety of purposes other than remote status indication. Since this circuit breaker is connected to the 15kV side of the transformer and the one-line doesn’t say anything different, you can assume it can handle 15kV. After the transformer’s draw out circuit breaker (A1), it is connected to a heavier, horizontal line. This horizontal line is an electrical bus.
