These are contactors that can switch electrical connections to very high currents. We can also classify them as a special kind of relay switch.
To switch to the high currents, they utilize a drive circuit that has coil drives with low power. If you’re keen on minimizing space, then placing the contactor near your load will reduce your wiring requirements.

Applications Of High Current DC Contactors
High-Current DC Contactors are used in regulating and arc in electrical connections. Such arcs occur as a result of the interruption of current from heavy motors.
These contactors are capable of handling currents of 5000A and above when handling heavy current motors.