ATEX-rated motor starting for hazardous-area duty
The 3RW5534-2HF14 carries ATEX and IECEx certification, meaning it can be deployed in Zone 1/21 or Zone 2/22 motor control centers without an external isolation barrier — the soft starter itself is the certified interface between the supply and the Ex-rated motor. Rated voltage is 200-480 V, covering the common low-voltage motor systems across 50 Hz and 60 Hz regions; the control supply accepts 110-250 V at either frequency. Trip class is selectable between CLASS 10A (default), CLASS 10E, CLASS 20E, and CLASS 30E per IEC 60947-4-2 — this lets the commissioning engineer match the thermal overload curve to the motor's winding time constant, avoiding nuisance trips on high-inertia starts while still protecting against locked-rotor conditions.
Fieldbus integration and analog feedback
Onboard communication includes Modbus RTU, Modbus TCP, and EtherNet/IP — the soft starter connects directly to a PLC backplane without a separate gateway module, saving a DIN-rail slot and reducing IP address consumption. An analog output configurable as 4-20 mA or 0-10 V provides real-time motor current to a SCADA system or local panel meter, enabling trending of start-up current profiles for predictive maintenance. PROFIBUS and PROFIenergy are supported when paired with the PROFINET communication module, allowing energy monitoring and coordinated shutdown sequences in automated lines.
Advanced starting and stopping profiles
Voltage ramp provides the basic soft-start profile; torque control adds a current-limited acceleration phase for loads that need a constant torque ramp rather than a voltage ramp — relevant for screw compressors and extruders where the load torque increases with speed. Breakaway pulse delivers a short high-torque burst to break static friction before the ramp begins — useful on belt conveyors and positive-displacement pumps that have a high breakaway torque requirement. Pump ramp down decelerates the motor gradually on stop, reducing water hammer in pumping systems; DC braking provides controlled deceleration for high-friction loads without mechanical brake wear.
Panel integration and clearance requirements
Physical dimensions are 306 mm height, 185 mm width, 203 mm depth — this is a panel-mount unit that requires 100 mm clearance above, 75 mm below, 10 mm in front, 5 mm at the sides, and 0 mm behind for airflow and wiring access. Termination is via screw-type terminals (: No indicates spring-clamp or ring-lug connection — confirm the exact termination style from the installation manual before panel layout).
Accuracy class 5 per IEC 61557-12 applies to the integrated current measurement; service factor 1.15 means the soft starter can sustain 115% of rated current continuously without derating — relevant for applications where the motor runs near full load. The safe state is open load circuit, meaning the fail-safe output (: 1 channel) opens the motor circuit on a fault condition, ensuring the motor stops even if the control system loses power.