Softstarters, Type PST/PSTB


PST30......PST72 PST85....PST142


PST30.......PST172 PST85.......PST142
Normal start, 400 V kW 15kW 18.5kW 22kW 25kW 30kW 37kW   45kW 55kW 75kW
Inline connected
Inside Delta connected
kW 25kW 30kW 37kW 45kW 55kW 59kW   75kW 90kW 132kW
Type PST30 PST37 PST44 PST50 PST60 PST72   PST85 PST105 PST142
Rated current le,A 30 37 44 50 60 72   85 105 142
Fuse Protection  400V, 65 kA
Bussmann Type 170M1366 170M1368 170M1369 170M1369 170M1370 170M1371   170M1372 170M3019 170M3020
Switch Fuse
Type OS160RD0380 ----------- ---------- ---------- ------------ -----------   ------- OESA250R03D80 ------------
Line Contactor
Type A30 A40 A50 A50 A63 A75   A95 A110 A145
By - Pass Contactor 
Type A16 A26 A26 A30 A40 A50   A50 A63 A75


How to select correct size

By using the guide below, you can quickly select a suitable softstarter for the most common
if a more precise selection is required, you can use prosoft, a selection software available at

Quick guide for selection
Normal start Class 10 Heavy duty start Class 30
Ordering - see page 22 - 23 Ordering - see page 24 - 25
Typical applications Typical applications
Bow thruster Centrifugal pump Centrifugal fan Conveyor belt (long)
compressor Conveyor belt (short) Crusher Mill
Elevator Escalator Mixer Stirrer

if more than 10 starts / h

select one size larger than the standard selection