NV 21/1V

The NV 21/1V belongs to the VM Amplifier Drives series produced by Bosch Rexroth Indramat. It is installed ahead of amplifier sections to provide incoming mains connection, protection, and switching functions, so it forms a power interface between the plant supply and the drive electronics used in industrial automation cells.

This module is cooled solely by Natural Convection; heat is dissipated through its metal surface without fans or liquid circuits, which simplifies maintenance and lowers audible noise. It draws up to 25 A at 460 V from the mains, indicating the maximum line current that downstream circuit components must accommodate. The supply connection expects 3-Phase AC, allowing balanced power delivery and lower conductor currents than single-phase feeds. With a mass of 10.6 kg, cabinet rail or plate mounting must provide adequate structural support for vibration in drive enclosures. The device is classified as a Line Wiring Module, meaning it handles fusing, isolation, and distribution rather than motor control or energy regeneration.

For contactor functionality, a starter is already Integrated, so external line contactors are unnecessary and wiring density is reduced. The rated network frequency is 50 Hz, aligning with most European industrial grids and ensuring correct magnetic core performance. Continuous apparent power capability reaches 24 kVA, defining how much drive-side load can be fed without exceeding thermal limits. Nominal operation requires a line voltage of 400 VAC; deviation from this value impacts current draw and component stress. Together, these electrical ratings let system designers select compatible circuit breakers, conductors, and amplifier sections while confirming that the module remains within temperature limits when installed in sealed cabinets.