The Siemens 3RU1116-0HB0 is a SIRIUS thermal overload relay in size S00, designed for three-phase motor protection. It mounts directly onto a contactor (contactor mounting per) and uses screw-type terminals for both main and auxiliary circuits. Trip Class 10 means it will trip within 10 seconds at 7.2× the set current — standard for standard-start induction motors driving pumps, fans, or conveyors where the rotor isn't locked for long.
The 3RU1116-0HB0 is the overload relay sibling to the 3RT1023-1AL20 contactor — same S00 frame, same screw-terminal pattern, same mounting footprint. If your panel was laid out for that contactor, this relay clips on without extra drilling or re-termination. The auxiliary contact ratings (1 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V —,) match the typical PLC or relay interface in a standard motor starter.
Mounting position is flexible: vertical surface with ±135° rotation and ±45° tilt front-to-back. Shock rated at 8g / 10 ms — fine for most industrial panels, not for high-vibration mobile equipment without additional support. Temperature range during operation is -20 to +70 °C; storage and transport handle -55 to +80 °C. Power dissipation is 1.6 W per pole — three poles total 4.8 W, negligible for panel thermal budgeting. Wire sizes: solid 2x (0.5…1.5 mm²) and 2x (0.75…2.5 mm²) for main and auxiliary; AWG equivalents 2x (20…16) and 2x (18…14) plus 2x 12 for main.