With which of the following, a circuit breaker must be equipped for remote operation ?

The correct answer is: E. All of the above

A circuit breaker must be equipped with all of the following for remote operation:

• Inverse time trip: This type of trip provides protection against overloads. The amount of time it takes for the circuit breaker to trip increases as the current increases. This is important because it allows for a small amount of overload current to flow for a short period of time without tripping the breaker. This is necessary for motors and other equipment that start with a high current draw.
• Time-delay trip: This type of trip provides protection against short circuits. The amount of time it takes for the circuit breaker to trip decreases as the current increases. This is important because it allows for a small amount of short-circuit current to flow for a short period of time without tripping the breaker. This is necessary to prevent nuisance tripping of the breaker on transient spikes in current.
• Shunt trip: This type of trip provides remote operation of the circuit breaker. It is a small device that is connected to the circuit breaker’s trip coil. When the shunt trip is activated, it sends a signal to the circuit breaker’s trip coil, which causes the breaker to open. This is important for applications where the circuit breaker needs to be opened from a remote location, such as in a control room.

It is important to note that not all circuit breakers are equipped with all of these features. Some circuit breakers may only have one or two of these features, while others may have all three. It is important to check the circuit breaker’s specifications to determine which features it has.