Question 281Electricity & Electronics - Assistant Engineer

The correct answer is A) KA1. The KA1 contactor or relay has a timing function for the transition from start to run. This is because the KA1 contactor is typically used to control the starting and running circuits of an electric motor. The timing function allows for a smooth transition from the starting windings to the running windings, preventing damage to the motor. The other options, KM1, KM2, and KM3, are general-purpose contactors or relays that do not have a specific timing function for the start-to-run transition. They may be used in various motor control applications, but they do not have the specialized timing feature that the KA1 contactor provides.