Quick take
When you start shopping for VFDs, soft starters, and motor controls, the first fork in the road is the type of control you need. A PWM controller, a soft starter, and a VFD are not interchangeable, and the four units here show that clearly. The SANYO DENKI San Ace PWM Controller is aimed at OEM fan and motor speed control. The Stellar SR22-09 is a soft starter. The Leeson Adjustable Speed AC Motor Control is the one VFD in the group. The Tiuan US425-02D-SM Digital Speed Control Pack tops the price spread at $375.00 with only the model number and used condition as identifiers.
Listed-price comparison
| Product | Listed price | Price bar |
|---|---|---|
| San Ace PWM Controller - SANYO DENKI - Industrial Fan / Motor Control - OEM Lase | USD 50.00 | |
| SR22-09 Stellar Soft Starter 9 FLA 480VAC 50/60Hz Motor Control Industrial PLC | USD 94.99 | |
| Leeson Adjustable Speed AC Motor Control 174264.00 Industrial VFD | USD 229.99 | |
| Tiuan US425-02D-SM Digital Speed Control Pack Industrial Motor Controller | USD 375.00 |
A $325.00 range separates the least and most expensive units, so the decision should be driven by motor voltage, current, and control style rather than price alone.
Decision matrix
| Product | Choose it if | Keep in mind |
|---|---|---|
| San Ace PWM Controller | You need a compact PWM fan or motor control and want the lowest price in this group. | Used condition; it suits a known replacement job better than a new build. |
| Stellar SR22-09 Soft Starter | You need soft starting for a 480V AC motor rated at 9 FLA. | The 9 FLA rating is a fixed target; this is not a general-purpose VFD. |
| Leeson Adjustable Speed AC Motor Control | You want a VFD for a 120V, 1/2 HP AC motor. | New-open-box condition; rated output is limited to 2.4 A at 0-230V. |
| Tiuan US425-02D-SM | You are replacing a Tiuan US425-02D-SM digital speed pack. | Used condition; only the model number is given, so there are no additional specifications to compare. |
Product notes
San Ace PWM Controller - SANYO DENKI - Industrial Fan / Motor Control - OEM Lase
The San Ace PWM Controller is the inexpensive way into adjustable speed for an industrial fan or small motor. It is a SANYO DENKI PWM controller, which means it modulates power to control speed rather than starting a motor gradually or varying frequency like a VFD. If you have an OEM laser application or a fan setup that already uses this style of controller, the price makes it an easy replacement choice. The trade-off is the used condition, so treat it as a replacement for a known PWM fan or motor rather than a universal first-time controller.
SR22-09 Stellar Soft Starter 9 FLA 480VAC 50/60Hz Motor Control Industrial PLC
The Stellar SR22-09 is the only unit here with a concrete current and voltage rating in its product title: 9 FLA at 480V AC 50/60Hz. That makes it the straightforward choice when you are wiring a soft starter into a 480V motor control circuit and you need a device that fits a 9-amp load. It is also the only soft starter in the group, so it belongs in applications where you want reduced starting current rather than continuous speed variation. The limitation is that the whole value of the unit depends on your motor matching that 9 FLA and 480V rating; if your motor is a different size, the controller will not serve you well.
Leeson Adjustable Speed AC Motor Control 174264.00 Industrial VFD
Leeson brings the only true VFD to this comparison. The product is an adjustable speed AC motor control rated for 120V input, 0-230V output, and 2.4A output, which matches a 1/2 HP AC motor. If you need to change speed continuously on a small AC motor, this is the one to pair with that motor. Its condition is new-open-box, so the unit itself is new but the packaging was opened. The practical ceiling is the motor size: at 1/2 HP and 120V, this VFD is intended for light-duty applications rather than large industrial motors.
Tiuan US425-02D-SM Digital Speed Control Pack Industrial Motor Controller
The Tiuan US425-02D-SM is the highest-priced unit and the only one labeled a digital speed control pack. If you already have this model in an existing system, a matching replacement is useful, especially in a production environment where a controller failure can stop a machine. The available identifiers are the Tiuan brand, the US425-02D-SM model, and a used condition. That means the pack is easiest to recommend when you already know this specific model from your current setup. For a first-time purchase with no prior experience, the other three units offer more concrete electrical information to work from.
Final recommendation by use case
- Known PWM fan or motor replacement on a budget: SANYO DENKI San Ace PWM Controller.
- Motor soft starting with a Stellar unit: Stellar SR22-09 Soft Starter.
- Small AC motor with adjustable speed: Leeson Adjustable Speed AC Motor Control 174264.00.
- Matching a Tiuan US425-02D-SM already in your system: Tiuan US425-02D-SM Digital Speed Control Pack.
