What the 81 A minimum setting and 200-480 V range mean for motor starting
The 3RW5056-6TB04: The 81 A minimum setting on the 200-480 V rated range means this soft starter covers the common low-voltage motor sizes from about 37 kW at 400 V up to roughly 55 kW at 480 V, depending on the service factor and starting duty. The voltage ramp, soft torque, and pump ramp down profiles give you tailored starting curves — soft torque reduces the initial current spike on belt-driven loads, pump ramp down eliminates water hammer on discharge lines. These are set via the integrated keypad or the fieldbus interface.
Fieldbus and hazardous-area certifications — one part for global panels
This soft starter carries ATEX, UKEX, and IECEx certification — that is the full set for explosive atmospheres under the ATEX 2014/34/EU directive, UK SI 2016/1107, and the IECEx Scheme. It also holds UL and CSA approval, so it is accepted in North American panels without a separate evaluation. Same part, different passports — genuine is genuine regardless of which region's stock it came from. On the fieldbus side it speaks PROFIBUS, PROFINET standard with PROFIenergy support, Modbus RTU, Modbus TCP, and EtherNet/IP. That covers the five most common industrial Ethernet and serial protocols — no gateway needed for a Siemens S7-1500, Rockwell CompactLogix, or Modbus TCP controller.
Mounting, clearance, and operating temperature — panel-fit constraints
The unit measures 249 mm deep, 120 mm wide, and 198 mm high — a standard DIN-rail footprint with screw fixing. The clearance requirements are specific: 100 mm upwards, 10 mm forwards, 75 mm downwards, 5 mm at the sides, and 0 mm backwards. That upward clearance is the tightest constraint — plan the gland plate and cable duct accordingly. The mounting position allows vertical surface mounting with ±90° rotation and ±22.5° tilt front-to-back, which gives flexibility in tight enclosures.
Same genuine Siemens part, different passport: the unit carries the same certifications regardless of which authorized region's stock it ships from.