Quick verdict
The right soft starter is dictated by the motor you're starting, not by the price tag. If you're protecting a 4-7 ton household AC compressor, the 16-32A AC Soft Starter is the right size. If you're controlling a 3-phase motor up to 40HP, the 3ph 40HP Motor Soft Starter covers the load. Decide by load first, then compare the two price points.
Comparison table
| Feature | 16-32A AC Soft Starter | 3ph 40HP Motor Soft Starter |
| Listed price | $120.89 | $575.00 |
| Current rating | 16-32A | 60A |
| Target use | Residential AC units between 4-7 tons | 3-phase motors up to 40HP |
| Notable extra | Reverse motor protection | Auxiliary contact |
Where each wins
The 16-32A AC Soft Starter wins for residential AC installations. It comes as an install kit and is sized for 4-7 ton compressors. It also fits HVAC systems, EV chargers, generators, and solar power setups, making it a good hookup for backup or off-grid use.
The 3ph 40HP Motor Soft Starter wins for industrial 3-phase loads. It has a wide 200-575V input range, 45-66Hz frequency coverage, and a 40HP capability at 400V. The Kimatek unit also carries cULus and CE IEC 60947-4 marks, which matters in professional settings.
Product notes
16-32A AC Soft Starter w/ Reverse Motor Protection For 4-7 Ton AC Install Kit
If your project is a 4-7 ton residential AC system, this starter is built for that job. The 16-32A current range is the key sizing number, and the install kit includes what you need to get started. Reverse motor protection is the standout feature here: it addresses low-voltage and over-current conditions that can otherwise stress a compressor. The unit is also listed for use with HVAC systems, EV chargers, generators, and solar power, making it a flexible companion for off-grid or backup setups. The main limitation is its narrow current band and residential focus. If your load steps beyond the 4-7 ton AC range, this unit won't have the headroom.
3ph 40HP Motor Soft Starter 60A 200-575V 45-66Hz w/ aux contact ASAC-0/030/5/1
This is the industrial one. With a 60A rating and a 40HP capability at 400V, it is meant for three-phase motors that need a strong start. The 200-575V input range and 45-66Hz frequency coverage give it broad compatibility across different power systems, and the auxiliary contact gives you a clean way to integrate it into a control circuit. The trade-off is the price: at $575.00, it costs more than the 16-32A unit and only makes sense if your motor actually demands that capacity. It measures 4" wide x 8" high x 7.375" deep and can be DIN rail or chassis mounted, so plan your enclosure accordingly.
Final choice by use case
Choose the 16-32A AC Soft Starter for residential AC loads up to 4-7 tons and for generator-backed setups. Choose the 3ph 40HP Motor Soft Starter for three-phase motors up to 40HP.
