When a motor doesn't start smoothly or you need to match speed to the job, you're looking at two different motor-control devices. One is a variable frequency drive (VFD) that changes the frequency and phase of the power going to a motor. The other is a soft starter that limits the inrush current during startup and makes shutdown gentler. If you're on a 220V single-phase supply, the 1 to 3 Phase Variable Frequency Drive Inverter 2.2 KW VFD 220 V 3 HP and the 220V Single Phase Motor Soft Starter Module Controller 2KW4KW6KW8KW(SSR-40WA-R1 are priced within a few dollars of each other, but they're built for different tasks.
Quick Verdict
Choose the VFD if you need to run a three-phase motor from a single-phase line, want adjustable motor speed, or need to control acceleration and deceleration through frequency. Choose the soft starter if your motor is single-phase, you only want to reduce startup stress and avoid mechanical shock, and you don't need speed control.
At a Glance
| Product | Price | Use for | Key details |
|---|---|---|---|
| 1 to 3 Phase Variable Frequency Drive Inverter 2.2 KW VFD 220 V 3 HP | USD 65.83 | Running a 3-phase motor from 220V single-phase with variable speed | 2.2 kW, 3 HP, 1-phase input, 50-60 Hz |
| 220V Single Phase Motor Soft Starter Module Controller 2KW4KW6KW8KW(SSR-40WA-R1 | USD 67.67 | Smooth start/stop for single-phase motors without speed adjustment | Supports 2-8 kW motors, compact controller module |
Where the VFD Wins
The 1 to 3 Phase Variable Frequency Drive Inverter is the only one of the two that converts a single-phase 220V input into three-phase output. It's a true frequency inverter, meaning you can vary the motor speed by changing the output frequency. It has a narrow body with an independent air duct for heat dissipation, and the keyboard can be mounted externally, which matters if you're installing it in a tight cabinet. This VFD is rated for 3 HP and draws 23A input at 50-60 Hz, so it's aimed at driving a 3 HP three-phase motor.
Where the Soft Starter Wins
The 220V Single Phase Motor Soft Starter Module Controller is for single-phase motors and is available in power ratings from 2 kW to 8 kW, so it covers a wider range of motor sizes than the VFD's fixed 2.2 kW rating. It is easy to install and includes protection features that react to prevent motor damage. It's meant to reduce the current impact and mechanical stress when a motor starts and stops. If you already have a single-phase motor and just need smoother operation, this soft starter is the simpler, more direct solution.
Product Notes
1 to 3 Phase Variable Frequency Drive Inverter 2.2 KW VFD 220 V 3 HP
This VFD from marddpair is a compact frequency drive that takes 220V single-phase input and outputs three-phase power to run a 2.2 kW motor. The design includes a narrow body and independent vertical air duct for efficient heat dissipation, and the keyboard can be external, which helps when space is tight. It accepts 50-60 Hz input at 23A and handles humidity up to 95% relative without dew. Consider it if you need variable speed control and a true three-phase output from a single-phase source. The trade-off is that it's not a general soft starter for single-phase motors; it's intended for a 3 HP three-phase motor, and you'll need to wire the output accordingly.
220V Single Phase Motor Soft Starter Module Controller 2KW4KW6KW8KW(SSR-40WA-R1
This LVSEDTAL soft starter module is built for single-phase motors and covers motor ratings from 2 kW to 8 kW, making it more flexible in power range than the VFD above. Its job is to ease motors into motion and bring them to a smooth stop, cutting down on current spikes and mechanical stress during startup. It is easy to install and designed with protection measures to help prevent motor damage. Choose it when your priority is protecting an existing single-phase motor and you don't need to adjust speed. Just keep in mind that a soft starter doesn't vary motor speed; it only manages the start and stop cycle, so it's not a substitute for a variable frequency drive.
Which One Should You Buy?
If your motor is three-phase and you only have single-phase power at 220V, the 1 to 3 Phase Variable Frequency Drive Inverter is the right choice. It gives you speed control and lets you run a 3 HP motor from a standard single-phase line. If your motor is single-phase and you want to protect it from startup surges and mechanical stress, the 220V Single Phase Motor Soft Starter Module Controller is the better pick. The two products are separated by less than $2 in price, but they serve different needs: a VFD changes how the motor spins, while a soft starter changes how it gets going and slows down.
