The purpose of contactor 2M is to _____.

The purpose of contactor 2M is to energize motor leads T4, T5, and T6 during running to connect the motor windings in a delta configuration. This is important in three-phase motor systems, particularly for motors designed for dual-voltage applications. When a motor is started, it may initially be configured in a star (or wye) configuration for reduced voltage starting, and then switched to a delta configuration for normal running conditions. Contactor 2M plays a crucial role in this switching process, bringing the appropriate windings into play to allow the motor to operate efficiently at its rated power and speed.

In contrast, other options relate to different functionalities that contactors do not perform. For example, energizing the control circuit for overload protection does not directly involve the motor windings' configuration but rather protects the motor from conditions that lead to overheating. Activating the emergency stop mechanism is related to safety features, which are separate from the motor's operational configuration. Controlling the speed of the motor typically involves variable frequency drives or other speed control methods that are distinct from the mere connection of the windings through contactors. Thus, the role of contactor 2M specifically aligns with connecting the motor leads in the delta