The Siemens 3RB3016-1PB0-ZX95 is a SIRIUS solid-state overload relay in size S00, designed to protect motors against overload and phase failure. The relay mounts directly onto a contactor (fastening method: contactor mounting), saving DIN-rail space in the panel. Rated for 690 V and carrying a thermal current of 4 A, this relay handles the control and signaling side of motor circuits in the S00 frame class — think small conveyors, pumps, and fans up to about 1.5 kW at 400 V. The auxiliary switch is integrated, and the relay provides a dedicated "tripped" message signal (Note: for message "tripped"), which can be wired directly into a PLC input or annunciator panel for remote fault indication.
Size S00 means a compact footprint: 45 mm wide, 79 mm high, 73 mm deep. It fastens directly onto the contactor — no separate DIN-rail base needed, which simplifies panel layout and reduces wiring distance to the power stack. Screw-type terminals on the main circuit accept 1× (0.5 to 4 mm²) or 2× (0.5 to 2.5 mm²) solid or stranded wire; use a Pozidriv PZ2 screwdriver with a 5–6 mm diameter shaft. Mounting position is any, so horizontal or vertical panel orientation works. The signaling contact (97/98) carries 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V — enough to drive a small relay or PLC input directly. Vibration resistance is 1–6 Hz at 15 mm amplitude and 6–500 Hz at 20 m/s² for 10 cycles; shock resistance is 15g for 11 ms. That holds up on a contactor mounted inside a panel on a machine frame.