The VFD004EL21A is a model of inverter manufactured by Delta Electronics. It is a variable frequency drive (VFD) designed for controlling the speed of three-phase induction motors. This specific model is part of Delta's VFD-EL series.

Here are some specifications of the VFD004EL21A Delta inverter:

- Power Rating: 0.4 kW (0.5 HP)

- Input Voltage: Single-phase 200-240V AC ±10%

- Output Voltage: Three-phase 0-Input Voltage

- Input Frequency: 50/60 Hz

- Output Frequency Range: 0.1-400 Hz

- Control Method: V/F (Voltage/Frequency) Control

- Built-in Potentiometer: Yes

- Communication Protocols: RS-485 Modbus