81 A minimum, 200-480 V — motor starting for ATEX zones
The Siemens 3RW5056-6TB14 is a SIRIUS soft starter with a minimum rated current of 81 A and a rated voltage of 200 to 480 V, making it suitable for medium-sized induction motors in applications requiring controlled acceleration and deceleration. Its Trip Class is preset to CLASS 10A / 10E, with CLASS 20E selectable per IEC 60947-4-2, meaning it protects the motor during start-up by limiting thermal stress — CLASS 10A is typical for standard starts, while CLASS 20E allows longer acceleration for high-inertia loads. The unit carries ATEX and IECEx certification, so it can be installed in potentially explosive atmospheres — a key differentiator from standard soft starters that lack hazardous-area approvals. This makes it a fit for chemical, oil-and-gas, or grain-handling lines where the starter must sit in or near the classified zone.
The 3RW5056-6TB14 mounts via screw fixing to a vertical surface, with the mounting surface rotatable ±90° and tiltable ±22.5° to the front and back. Clearance requirements: 100 mm upwards, 10 mm forwards, 0 mm backwards, 75 mm downwards, and 5 mm at the side — plan these gaps into the panel layout to avoid derating or airflow restriction. Dimensions are 120 mm wide, 198 mm high, and 249 mm deep. Shock resistance is rated at 15 g / 11 ms, dropping to 12 g / 11 ms with potential contact lifting — ensure the mounting bracket and panel are rigid enough to avoid exceeding these limits in high-vibration environments.
Approvals include CE marking, UL approval, and CSA approval, covering the major North American and European regulatory jurisdictions. No official successor or replacement is listed — this is the active variant for new designs.