What the Class 10E rating means for motor protection
The 3RB3016-1PB0 is a solid-state overload relay from the Siemens SIRIUS family, designed to protect three-phase motors against overcurrent and phase imbalance. Its Class 10E trip class means it will open the circuit within 10 seconds at a 7.2× overload — a tight window that keeps the motor winding from overheating during a stall or jam, while allowing enough headroom for normal starting inrush on most pump, fan, and conveyor drives. The thermal current rating is 4 A continuous, with a rated insulation voltage of 690 V and maximum AC-3e operational voltage of 690 V. This covers standard 400 V and 480 V motor circuits with headroom to the 600 V class. Auxiliary contacts are integrated — the relay signals a tripped state via a dedicated message contact. The contact ratings span common control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, plus DC ratings at 0.55 A at 60 V, 0.3 A at 125 V, and 0.11 A at 220 V. This covers most PLC input modules and contactor coils in the same panel.
Panel footprint and environmental limits
Size S00 overload relay, 45 mm wide × 79 mm high × 73 mm deep — fits the standard SIRIUS S00 contactor footprint and mounts directly onto the contactor via the integrated fastening method, saving DIN-rail space. The screw terminals accept 1× (0.5 to 4 mm²) or 2× (0.5 to 2.5 mm²) solid or stranded wire; the screwdriver shaft diameter is 5 to 6 mm, Pozidriv PZ2 tip. Operating temperature range is -25 to +60 °C with temperature compensation built in; storage and transport range is -40 to +80 °C. The relay withstands 15 g shock at 11 ms (signalling contact 9 g at 11 ms when tripped) and vibration per IEC 60068-2-27: 1–6 Hz at 15 mm amplitude, 6–500 Hz at 20 m/s² for 10 cycles. Mounting position is unrestricted.