Starting a single-phase motor without a soft starter can slam the shaft into full speed the moment power is applied. A soft starter ramps the voltage up over a short interval instead. For anyone shopping soft starters and motor controls, choosing between two similar single-phase units-one sold as a 1/2/4/6/8KW motor soft starter, the other as a single-phase soft-starting module-comes down to price, part-number clarity, and the motor size you need to match.
Quick verdict
Both are new single-phase soft starters with potentiometer-adjustable starting voltage and soft-start time. The 1/2/4/6/8KW Soft Starter is the lower-priced option, with a B-1.5KW kilowatt label and a title that covers 1/2/4/6/8KW motor sizes. The Single-Phase Soft-Starting Module is specified as SSR-60WA-R1（2KW） with a 550g weight. Choose the first if you want the lower price and a multi-size motor reference. Choose the second if a direct 2KW specification matters more than the $2.40 price gap.
Comparison at a glance
| Product | Price | Key spec reference | Start adjustment |
|---|---|---|---|
| 1/2/4/6/8KW Soft Starter | USD 48.59 | B-1.5KW; title covers 1/2/4/6/8KW | Potentiometer-adjustable |
| Single-Phase Soft-Starting Module | USD 50.99 | SSR-60WA-R1（2KW）; 550g | Potentiometer-adjustable |
Where each product wins
The 1/2/4/6/8KW Soft Starter wins on price and motor-size reference. It is $2.40 less than the module, and its title gives you a 1/2/4/6/8KW range to work with.
The Single-Phase Soft-Starting Module wins on spec clarity. It states an SSR-60WA-R1（2KW） reference and gives a 550g weight, so there is no multi-size label to sort through.
Product notes
1/2/4/6/8KW motor Soft Start Soft Starter Single Phase Soft Starter AC 220V
At USD 48.59, this is the lower-priced pick. It is a single-phase soft starter designed to bring a motor up to speed gradually, and the title names 1/2/4/6/8KW motor sizes as a reference point. The product also specifies a B-1.5KW kilowatt setting, and the description gives adjustment examples for 220V and 380V supplies. The start potentiometer sets the starting voltage and the soft-start potentiometer sets the ramp time up to about 30 seconds. The limitation is that the kilowatt information sits in two places: a multi-size title and a single B-1.5KW specification. You need to match the variant you actually have when you make the call.
Single Phase Motor Soft Starter Single-phase Soft Starting Module Soft Start
At USD 50.99, the module costs $2.40 more but it is the more direct part number. It is specified as SSR-60WA-R1（2KW）, so the 2KW rating is stated upfront, and it also lists a 550g weight as a physical reference. It shares the same single-phase soft-start approach as the other unit: a potentiometer for starting voltage, another for soft-start time, and the description includes 220V and 380V adjustment examples. If you already know your motor is in the 2KW range and you want a named specification instead of a multi-size reference, this unit is the cleaner choice. The trade-off is simply that it costs a little more.
Final choice by use case
Pick the 1/2/4/6/8KW Soft Starter if you want the lower price and a product title that points to common single-phase motor sizes from 1KW to 8KW.
Pick the Single-Phase Soft-Starting Module if you prefer a clear SSR-60WA-R1（2KW） specification and want the 550g weight reference, and you are comfortable spending a bit more.
Both smooth out motor startup with adjustable voltage and ramp time. The final call is whether a multi-size reference or a single clear kW rating matters more to you.
