Sizing the C200 for a 3.7 kW load
The Delta VFD037CB43A-20 is the 3.7 kW / 5 HP frame in the C200 family of economy vector-control drives, specified for a 460 V 3-phase input and built for IP20 / UL Open Type panel mounting in a wall-mount (version A) chassis. That puts it on pumps, fans, conveyors, and small compressors where 5 HP of variable-speed control is the load envelope — sized to the motor, not above it, so the drive's continuous current and the motor's full-load amps line up at the same point on the torque curve.
Input current, output range, and torque headroom
The drive draws 14 A on the 460 V 3-phase input, with a maximum output frequency of 0.00–600.00 Hz under normal duty and 0.00–300.00 Hz under heavy duty — the wider normal-duty band is what makes the C200 usable for high-speed spindle or pseudo-servo applications, not just fans. A 200% torque-current limit gives the C200 the starting punch needed for conveyors and mixers where the breakaway load is well above the running load — the headroom is what lets the drive hold the motor through the first second without stalling. V/F, SVC, V/F+PG, and FOC+PG control modes are all available, so the same drive runs in plain volts-per-hertz for a simple fan, in sensorless vector for torque-sensitive loads, or in closed-loop vector with an encoder for the most demanding speed-holding applications.
Where the C200 sits in the Delta line
Inside the C200 family, the 3.7 kW VFD037CB43A-20 sits between the 230 V-class VFD037CB23A-20 — same power, different input voltage — and the 460 V VFD040CB43A-20 / VFD055CB43A-20 frames at 4.0 kW and 5.5 kW, which step input current from 14 A up to 15.5 A and 17 A respectively while keeping the same chassis, IP20 rating, and output envelope.