The Siemens 3RU1116-1AB0-ZW96 is a SIRIUS thermal overload relay, Size S00, designed for motor protection in control panels. It mounts directly onto a contactor (fastening method: contactor mounting) and protects against overload and phase failure by tripping the contactor coil when the motor current exceeds the set threshold for too long. Trip Class 10 means the relay will trip within 10 seconds at 7.2× the set current — standard for general-purpose motor starting where the inrush is brief and the motor reaches speed quickly. That covers most pump, fan, and conveyor applications without nuisance tripping.
Panel fit and wiring
Size S00 footprint: 45 mm wide, 87 mm tall, 78 mm deep. Mounting clearances are tight — zero clearance upwards, forwards, and backwards, 6 mm at the side. That means you can pack relays side-by-side on the DIN rail without extra spacing, but leave the 6 mm side gap for airflow and wiring access. Main circuit terminals accept solid or finely stranded wire: 2× (0.5…1.5 mm²) and 2× (0.75…2.5 mm²), plus AWG equivalents 2× (20…16) and 2× (18…14). Auxiliary/control circuit terminals take 2× (0.5…1.5 mm²) and 2× (0.75…2.5 mm²) or AWG 2× (20…16) and 2× (18…14). All screw-type — no special tooling needed.
Auxiliary contact ratings
The built-in auxiliary contacts (normally open and normally closed) are rated for switching: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, plus 0.22 A at 110 V or 125 V, and 0.11 A at 220 V. These are the contact ratings for the signal circuit that feeds the contactor coil or a PLC input — keep the load within these limits to avoid welding the contacts.