ABB PST37 1SFA894003R7000 Softstarter, 37 A In-Line, 18.5 kW

The 1SFA894003R7000: The 37 A in-line rating governs the standard motor connection — sized for a 18.5 kW motor at 400 V. The 64 A inside-delta rating applies when the starter is wired in the delta legs of a star-delta motor, boosting capacity to 30 kW at 400 V. The 115 % service factor means the starter can run at 115 % of rated current continuously without tripping, useful for high-inertia loads that need a longer acceleration profile. Control supply accepts 100–250 V AC, with a separate 24 V DC control circuit for the logic inputs. The built-in electronic overload eliminates the need for a separate overload relay, saving a DIN-rail slot. Screw terminals on the control circuit accept 1 × 2.5 mm² rigid; main circuit terminals accept 1 × 10–95 mm² rigid, torqued to 0.5 N·m on the control side. Four signal relays — run, fault, bypass, and overload — give the PLC or DCS discrete feedback for each state. The analog output provides a 0–10 V signal proportional to motor current, useful for trending or HMI display. Communication is via the standard FieldBusPlug, meaning an optional fieldbus adapter module plugs in for PROFIBUS, DeviceNet, or Modbus RTU — no separate gateway needed.