Trip class and what it means for motor protection
The 3RU2136-4JD0: The thermal bimetallic release tracks motor heating, not instantaneous peaks, so it rides through inrush and catches sustained overloads that would cook the winding insulation.
Auxiliary contact ratings for the control loop
At 230 V the rating drops to 2 A; at 400 V it is 1 A. Match the control voltage to these limits — the switch is rated for the full 690 V main circuit, but the auxiliary contacts are the bottleneck on higher-voltage control schemes.
Fastens directly onto the contactor via the integrated mounting mechanism — no separate base or adapter bracket needed. The screwdriver spec is Pozidriv PZ2 with a 5–6 mm shaft diameter — no special tooling required. Dimensions are 90 mm high, 55 mm wide, 105 mm deep — the S2 footprint fits standard Siemens SIRIUS contactor assemblies without encroaching on adjacent wiring ducts.
Lifecycle and compliance documentation
The substance prohibitance date is October 15, 2014, confirming RoHS compliance for the current manufacturing batch. Temperature compensation is active from -40 to +60 °C, so the trip curve stays accurate across the panel ambient range.