VFD9A0MS43AFSAA Variable Frequency Drive MS300 4.0kW 3-ф/380

Delta VFD9A0MS43AFSAA is an MS300 inverter rated 4.0 kW with three-phase 380–480V supply (3×380). The AFSAA build adds a built-in class C3 EMC filter and a built-in brake chopper, so only a brake resistor is needed externally.

Control is V/f and sensorless vector (SVC) for induction motors, with PM support via IM/PM selection and auto-tuning. A built-in Modbus RTU (RS-485) port, STO and a simple on-board PLC are included. Enclosure is IP20.

This is a working frame for mid-power pumps, fans and conveyors. Control is sensorless (no speed feedback device needed), which simplifies installation. A universal in-stock replacement is the Veichi AC310. We will match the part number to your motor.

Delta MS300 — compact AC drive with built-in brake chopper and STO

The MS300 is Delta's standard-compact frequency inverter that succeeds the VFD-E and VFD-M families. In our catalogue the series spans 1.5 to 22 kW across two supply classes: single-phase 230V (1×220 input, three-phase 220V to the motor) and three-phase 380–480V (3×380). It is a ready-to-work drive for machine building, conveyors, fans and pumps where panel compactness matters.

What actually sets the MS300 apart in the compact class

The first thing we point engineers to: the brake chopper is built into every model in the series — per the manufacturer datasheet it is present from 0.2 kW up to 22 kW. In practice this means dynamic braking only requires an add-on brake resistor, not an external braking module. That is a typical Delta advantage over many compact competitors where the chopper disappears at mid power.

Second is motor control. The MS300 runs V/f and sensorless vector control (SVC) for induction motors, and drives permanent-magnet (PM) synchronous motors in sensorless PMSVC mode via a dedicated IM/PM selection and a built-in PM speed estimator. Control is fully sensorless — no encoder is required, which simplifies wiring and commissioning. If you need a hard closed loop with a speed feedback device, choose a higher series that supports a PG card.

Communication, safety, filtering

A built-in RS-485 Modbus RTU port (COM1) is on every MS300, so connecting to a PLC or SCADA needs no extra card. CANopen, Modbus-TCP, EtherNet/IP, PROFIBUS, EtherCAT and PROFINET are added via option cards (for example CMM-COP01 for CANopen). The drive includes STO (Safe Torque Off), simplifying integration into emergency-stop systems without an external contactor.

In the AFSAA build (exactly the part numbers in this catalogue) the EMC filter is built in (class C3 with motor cable up to 30 m). Output frequency reaches 599 Hz per the manufacturer datasheet, and a simple built-in PLC handles basic logic. Enclosure rating is IP20.

When to look our way

The MS300 is a strong pick if you already run a Delta fleet or need a compact all-in-one drive. If the series is unavailable or you want a universal replacement, look at Veichi AC310 — also vector/PM across the same power range; for simple V/f tasks see AC10, and for compact single-phase jobs the AC01. We will help match the exact part number to your motor and duty.