ABB soft starter: which series we ship for which motor
We stock ABB in three series: PSR (compact, up to 55 kW), PSE (mid-range up to 132 kW) and PSTX (heavy duty up to 710 kW). Most of our customers are pumping-station technologists or plant chief electricians whose old soft starter has failed and needs a fast replacement with minimal panel rework.
Before we ship we ask four things. First: motor power and FLA from the nameplate (not the installation spec). Second: load type, since a pump or fan is one thing, a crusher or mill is something else. Third: whether the line already has its own bypass contactor, or we need a model with bypass built in. Fourth: supply voltage, because ABB makes one lineup for 208-600 V and a separate one up to 690 V.
PSR: when the cheapest one will do
PSR is what we ship for motors up to 55 kW with a standard start: pump, fan, unloaded conveyor. Bypass is already inside, heat dissipation is minimal. Our most-shipped SKUs are PSR25-600-70 (12 kW), PSR45-600-70 (22 kW) and PSR60-600-70 (30 kW). For an 11 kW well pump this is enough, as long as inrush stays under 3.5×Iн, otherwise PSR will trip.
PSE: when serious motor protection matters
PSE goes to industrial sites where downtime costs money. Overload monitoring, phase imbalance, ground-fault detection, Modbus RTU for SCADA. Range is 7.5-132 kW, typical SKUs in our warehouse: PSE45-600-70, PSE105-600-70 (55 kW), PSE170-600-70 (90 kW). One caveat: from PSE105 up the external bypass is not in the box, ask us separately.
PSTX: heavy duty with adaptive torque
PSTX is the top tier. Adaptive torque control, bypass built in across the whole line, Profinet out of the box, up to 710 kW. In our view, PSTX is worth the money only when you have a crusher, ball mill, or piston compressor; otherwise you overpay. Most often we ship PSTX105-600-70 (55 kW) for screw compressors and PSTX170 for feed grinders.
What else we ask and how long it takes
We ask about panel temperature (ABB holds nominal up to 40°C, above that you need to derate). We ask about starts per hour (PSR likes rare, PSTX handles up to 10 per hour). Two-year warranty, delivery from our Kyiv warehouse in 1-3 days for PSR and PSE; PSTX sometimes ships to order, lead time 5-10 days. Datasheet for any SKU available before payment.
