176F3494 by Danfoss

The 176F3494 is a power interface module manufactured by Danfoss. Installed inside medium-voltage VLT drives, the card links the rectifier section to the inverter output and allows controlled transfer of high-power energy to the motor phases. It integrates gate-drive logic, current sensing, and fault pathways on one printed circuit assembly for coordinated power switching and monitoring. This role lets the module manage energy transfer between the upstream conversion stage and the motor-side output section during normal drive operation. Because these functions are grouped on one assembly, signal paths between sensing and switching stages remain short and direct.

The card withstands line voltage up to 690 V, so it can operate within higher-voltage drive systems. Operation remains stable down to 525 V, allowing use on installations with lower nominal line voltages inside the same operating window. Its gross mass is 2 kg, and the net mass is the same, indicating a compact assembly without additional packed hardware. The low mass helps keep internal mounting loads modest in high-power cabinets. That compact form also helps the module fit within the available space of the surrounding power section. The geometry follows the footprint used in the VLT PowerCards series, so the module fits the intended drive layout.

The functional envelope aligns with drive sections that carry up to 75 kW of motor load. The overload class is Normal Overload (NO), which suits standard constant-torque applications rather than heavy intermittent surges. The unit is identified as a Power Card, meaning the switching elements, snubber networks, and feedback circuits are arranged on one multilayer board. It also has a ruggedized build with conformal-coated traces, reinforced connectors, and vibration-resistant solder. These features help the module tolerate shock and vibration commonly found near compressors, conveyors, and other floor-level machinery.