Reversing starter for ET 200X — PROFIBUS DP, IP65, with brake contact
The Siemens 3RK1300-1DS01-1AA4 is an EM 300 RS electromechanical reversing starter designed for the ET 200X distributed I/O system. It integrates a reversing contactor pair, bimetal overload protection, and a motor brake output into a single IP65 enclosure — meaning it lives directly on the machine, not in a central panel, and handles reversing duty for small motors up to 1.1 kW at 400 V AC-3. The setting range of 2.2…3.2 A covers the full-load current of a 1.1 kW motor at 400 V; the bimetal overload matches the motor thermal curve, so the part is sized for that specific motor power class. The 50 A short-circuit breaking capacity at 400 V means the integrated circuit-breaker-type short-circuit protection clears faults up to that level without upstream coordination issues. PROFIBUS DP is onboard, so the starter communicates directly with the ET 200X backplane — no separate gateway or I/O block needed for the reversing function. The brake contact output is rated DC 500 V / 1 A for internally supplied brakes, which is the typical spec for small holding brakes on geared motors and servo axes.
Integration into ET 200X — dimensions, wiring, and environment
At 134 mm deep × 140 mm wide × 270 mm high, the 3RK1300-1DS01-1AA4 occupies one slot in the ET 200X modular rail system. The main current circuit connects via tab terminals — fast push-on connections that match the ET 200X power distribution bus — while the 9-pole motor feeder and 9-pole power connection handle the motor cable and brake wiring. Rated operating voltage is 400…500 V AC, covering standard 400 V three-phase networks with tolerance for 480 V installations. The IP65 rating means the housing is dust-tight and protected against low-pressure water jets — suitable for washdown areas, machine-side mounting, or outdoor enclosures where a central panel isn't practical. Ambient temperature range is 0…55 °C, so it handles unventilated machine cabinets or warm production floors.