What does the ATEX and IECEx certification mean for this soft starter?
The 3RW5074-6TB15 carries ATEX and IECEx certification, meaning it is approved for use in potentially explosive atmospheres — not just the starter itself, but the motor circuit it controls, when installed per the relevant standards. This is a differentiator from standard soft starters that lack hazardous-area approval; if your line runs in a Zone 1 or Zone 2 gas environment, or a Zone 21/22 dust environment, this part meets the certification requirement without needing an external isolation barrier.
What is the operating window and how does it govern motor fit?
Rated for a minimum 135 A at 200-600 V, the 3RW5074-6TB15 covers medium-to-large induction motors in the 75-150 kW range depending on line voltage and duty cycle — the 135 A floor is the lowest continuous current you can set, so the motor full-load current must be at or above that.
Lifecycle and compliance — still in active production
It carries UL, CSA, and CE marking, so it is accepted in North American and European panels without additional agency review for the starter itself.
Dimensions are 282 mm deep, 160 mm wide, 230 mm high — this is a screw-fixed device, not a DIN-rail snap-on, so plan for four mounting holes on the back panel and leave the specified clearances: 100 mm upwards, 10 mm forwards, 0 mm backwards, 75 mm downwards, and 5 mm at the sides. Mounting position is flexible — the unit can be rotated ±90° on a vertical surface and tilted ±22.5° forward or backward, which helps when fitting into existing enclosures with non-ideal mounting planes.
Fieldbus and control features
Built-in support for PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP means this starter can be dropped into most common industrial networks without an external gateway — the fieldbus interface is integrated, not an add-on module. It includes voltage ramp, soft torque, and pump ramp-down profiles — the pump ramp-down is specifically useful for preventing water hammer in pumping applications, while soft torque helps with high-friction loads like conveyors. Remote reset is available by cycling the control supply voltage — useful for unattended restart after a fault, though the auto-reset function is also present if the application allows automatic re-start.