Product Description:

The NV 21/1V is a line wiring module from Bosch Rexroth Indramat within the VM Amplifier Drives series. Classified as a power interface component, it channels three-phase mains energy into interconnected VM servo amplifier racks and combines switching, protection, and distribution functions in one mechanical frame for industrial automation cells. By managing the incoming supply and providing standardized bus connections, the module simplifies cabinet layout, supports organized power routing across multiple axes, and gives downstream inverter sections a stable source for precise motion control. This arrangement also helps separate line-side wiring from amplifier sections, making the power path easier to follow inside dense drive cabinets.

Electrically, the module is designed for a nominal input of 400 VAC at a grid frequency of 50 Hz. Under those conditions, it can deliver up to 24 kVA of apparent power to the DC bus, which is suitable for medium-size multi-axis stations that require shared incoming power. When connected to a UL-listed network segment, it draws 25 A (460 V), so the supply branch must support that continuous current. The supply connection expects a 3-phase AC source, which helps balance line currents and reduces the need for neutral conductors in the incoming feed. Heat is removed by natural convection through the finned housing, eliminating the need for fan-based cooling while keeping internal components within their normal operating range.

Mechanically, the unit is a line wiring module with primary fuses, bus bars, and plug-in terminals for wiring multiple amplifiers in parallel. An integrated power contactor enables remote startup sequencing without an external relay, and its coil can be driven directly from the control system for controlled power connection to the rack. The housing weighs 10.6 kg, which suits installation in a standard 19-inch enclosure and helps keep handling demands moderate during panel assembly. Its terminal arrangement also supports orderly mains distribution inside the enclosure, which is useful where several amplifier sections share a common supply path.