Product pictures Product Overview: Emerson SP3401 Parameter Specification Manufacturer Emerson Order Number SP3401 Product Name High-performance AC drive / variable speed inverter Series / Family Unidrive SP (neighbouring codes include SP3402, SP3403, SP2401 and SP4401) Application & Fault Scenarios Suitable for 400V three-phase motors on paper machines, steel processing lines, cement plants, heavy conveyors, large fans and pumps requiring stable speed and high torque.