一、是一種集軟啟動、軟停車、輕載節(jié)能和多功能保護(hù)于一體的裝備。實現(xiàn)在整個啟動過程中無沖擊而平滑的啟動電機(jī)，而且可根據(jù)電動機(jī)負(fù)載的特性來調(diào)節(jié)啟動過程中的各種參數(shù)，如限流值、啟動時間等。
二、（Variable-frequency Drive，VFD）是應(yīng)用與微電子技尸通過改變電機(jī)工作電源頻率方式來控制的電力控制設(shè)備。
三、和軟啟動的區(qū)別
1、頻率方面： 的輸出頻率固定為電源頻率，頻率不可調(diào)；是輸出頻率可調(diào)。
2、電壓方面： 通過控制（或其他電力電子元件）導(dǎo)通角來控制輸出電壓，其輸出電壓由0V慢慢升到；變頻器的電壓是可調(diào)的。
3、電機(jī)速度方面：
軟啟動器不可調(diào)節(jié)電機(jī)速度；變頻器可以調(diào)節(jié)電機(jī)在任何速度運行。

CPSS18/30-500L

PSS30/52-500L
PSS37/64-500L
PSS44/76-500L
PSS50/85-500L
PSS60/105-500L
PSS72/124-500L
PSS85/147-500L
PSS105/181-500L
PSS142/245-500L
PSS175/300-500L
PSS250/430-500L
PSS300/515-500L
PSTEK
PSTM-2
PSTHM-26/16
PSTHM-44/16
PSTHM-56/16
PSTHM-95/16
PSTP-280/16
PSTP-280/18
PSTP-370/16
PSTP-370/18
PSTP-540/16
PSTP-540/18
PSTP-600/16
PSTP-760/18
PSTP-990/16
PSTHM-132/16
PSTHM-162/16
PSTHM-200/16
PSTHM-312/16
PSTHM-501/16
PST 30-600-70
PST 30-690-70
PST 37-600-70
PST 37-690-70
PST 44-600-70
PST 44-690-70
PST 50-600-70
PST 50-690-70
PST 60-600-70
PST 60-690-70
PST 72-600-70
PST 72-690-70
PST 85-600-70
PST 85-690-70
PST 105-600-70
PST 105-690-70
PST 142-600-70
PST 142-690-70
PST 175-600-70
PST 210-600-70
PST 210-690-70
PST 250-600-70
PST 250-690-70
PST 300-600-70
PST 300-690-70
PST 30-600-70T
PST 30-690-70T
PST 37-600-70T
PST 37-690-70T
PST 44-600-70T
PST 44-690-70T
PST 50-600-70T
PST 50-690-70T
PST 60-600-70T
PST 60-690-70T
PST 72-600-70T
PST 72-690-70T
PST 85-600-70T
PST 85-690-70T
PST 105-600-70T
PST 105-690-70T
PST 142-600-70T
PST 142-690-70T
PST 175-600-70T
PST 175-690-70T
PST 210-600-70T
PST 210-690-70T
PST 250-600-70T
PST 250-690-70T
PST 300-600-70T
PST 300-690-70T
PSEEK
PSEHMI-1
PSEHMI-2
PSEHMI-3
PSE Demo box
PSE18-600-70
PSE25-600-70
PSE30-600-70
PSE37-600-70
PSE45-600-70
PSE60-600-70
PSE72-600-70
PSE85-600-70
PSE105-600-70
PSE105-600-70
PSE170-600-70
PSE210-600-70
PSE250-600-70
PSE300-600-70
PSE370-600-70
PSR3-600-11
PSR3-600-70
PSR6-600-11
PSR6-600-70
PSR9-600-11
PSR9-600-70
PSR12-600-11
PSR12-600-70
PSR16-600-11
PSR16-600-70
PSR25-600-11
PSR30-600-11
PSR30-600-70
PSR37-600-11
PSR37-600-70
PSR45-600-11
PSR45-600-70
PSR60-600-11
PSR60-600-70
PSR72-600-11
PSR72-600-70
PSR85-600-11
PSR85-600-70
PSRC3-600-70
PSRC6-600-70
PSRC9-600-70
PSR105-600-11
PSR105-600-70
PSRC12-600-70
PSRC16-600-70
PSRC25-600-70
PSRC30-600-70
PSRC37-600-70
PSRC45-600-70
PSRC60-600-70
PSRC72-600-70
PSRC85-600-70
PSR-Fan(3-45)
PSRC105-600-70
PSR-Fan(60-105)
PSTB 370-600-70
PSTB 370-690-70
PSTB 470-600-70
PSTB 470-690-70
PSTB 570-600-70
PSTB 570-690-70
PSTB 720-600-70
PSTB 720-690-70
PSTB 840-600-70
PSTB 840-690-70
PSTB 1050-600-70
PSTB 1050-690-70
PSTB 370-600-70T
PSTB 370-690-70T
PSTB 470-600-70T
PSTB 470-690-70T
PSTB 570-600-70T
PSTB 570-690-70T
PSTB 720-600-70T
PSTB 720-690-70T
PSTB 840-600-70T
PSTB 840-690-70T
PSTB 1050-600-70T
PSTB 1050-690-70T
PSTX30-600-70
PSTX30-690-70
PSTX37-600-70
PSTX37-690-70
PSTX45-600-70
PSTX45-690-70
PSTX60-600-70
PSTX60-690-70
PSTX72-600-70
PSTX72-690-70
PSTX85-600-70
PSTX85-690-70
PSTX105-600-70
PSTX105-690-70
PSTX142-600-70
PSTX142-690-70
PSTX170-600-70
PSTX170-690-70
PSTX210-600-70
PSTX210-690-70
PSTX250-600-70
PSTX250-690-70
PSTX300-600-70
PSTX300-690-70
PSTX370-600-70
PSTX370-690-70
PSTX470-600-70
PSTX470-690-70
PSTX570-600-70
PSTX570-690-70
PSTX720-600-70
PSTX720-690-70
PSTX840-600-70
PSTX840-690-70
PSTX1050-600-70
PSTX1050-690-70
PSTX1250-600-70
PSTX1250-690-70