What it is and what it does
The Siemens 3RU1116-1JB0-ZW96 is a SIRIUS thermal overload relay — the part that sits between your contactor and motor, watching current and tripping if the load draws too long above rated. It's a CLASS 10 trip, meaning it will open the circuit within 10 seconds at 7.2× the set current, which is the standard for standard-duty induction motors starting under load. The S00 frame size tells you it mates with the S00 contactor family and handles motor FLCs in the lower range of the SIRIUS line.
Where it fits and how it mounts
Mounts directly onto the contactor — the fastening method is contactor mounting, so no DIN rail bracket needed if you're snapping it onto a S00 contactor. The dimensions are compact: 45 mm wide, 87 mm tall, and 78 mm deep. That depth matters when you're calculating gland-plate clearance or panel-door swing. Mounting position is flexible: vertical surface, rotatable ±135° and tiltable ±45° front-to-back, which helps when you're squeezing it into a tight enclosure corner. Side clearance to adjacent devices is 6 mm; zero clearance needed upwards, forwards, backwards, or downwards.
Terminals and wiring
Both main and auxiliary/control circuits use screw-type terminals. The solid wire capacity is 2× (0.5 … 1.5 mm²) and 2× (0.75 … 2.5 mm²); finely stranded with core-end processing matches the same ranges. For AWG on the auxiliary contacts, it accepts 2× (20 … 16) and 2× (18 … 14). That's enough for standard motor-circuit wiring and control-loop conductors. The front is finger-safe per IP20 — touch-safe for the panel builder but not for washdown environments.
Ratings that matter for the panel
Power dissipation is 2.2 W per pole — three poles means 6.6 W total heat to manage inside the enclosure. That's modest, but if you're packing a dozen of these in a sealed box, the thermal rise adds up. Auxiliary contact ratings: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V. These are the currents the built-in auxiliary switch can break — useful for signaling the PLC or a status lamp. Surge voltage resistance is 6 kV, which covers the impulse withstand for most industrial control panels. Shock resistance is 8g for 10 ms — fine for machine-mounted applications with moderate vibration.