What it is and where it fits
The Siemens 3RU1116-1HB0-ZX95 is a SIRIUS thermal overload relay in size S00, designed to protect three-phase motors against overload and phase failure. It mounts directly onto a contactor via the fastening method specified as contactor mounting, so it integrates into the motor starter assembly without extra DIN-rail space. Trip Class 10 means it will trip within 10 seconds at 7.2× the current setting — standard for general-purpose motor protection on conveyors, pumps, and fans.
Key ratings and what they mean for fit
The relay carries screw-type terminals for both the main current circuit and the auxiliary/control circuit, accepting solid conductors of 2x (0.5 … 1.5 mm²) and 2x (0.75 … 2.5 mm²) — or AWG equivalents 2x (20 … 16) and 2x (18 … 14) for the auxiliary contacts. That terminal range covers standard motor-control wiring up to 2.5 mm², so it suits panel builds using typical PVC-insulated cable. The IP20 protection on the front makes it finger-safe for open-panel installations, and the ATEX certification (DMT 98 ATEX G 001) allows use in potentially explosive gas atmospheres — a key check for process-area deployment. Surge voltage withstand is rated at 6 kV, which aligns with IEC 60947-1 overvoltage category III for industrial control panels. The operating temperature range of -20 to +70 °C with 100 % relative humidity covers most indoor and sheltered outdoor environments. Shock resistance of 8g / 10 ms ensures the relay holds calibration under moderate vibration — typical for motor-starter panels mounted on pump skids or conveyor frames.
Mounting and clearances
The relay occupies a 45 mm width footprint and 87 mm height, with a depth of 78 mm from the mounting surface. Clearance requirements: 0 mm upwards, 0 mm forwards, 0 mm backwards, 0 mm downwards, and 6 mm at the side. That zero-clearance at five of six faces means it can be packed tight against adjacent components — useful when panel space is tight. The mounting position allows the vertical mounting surface to be rotated ±135° or tilted ±45° front/back, giving flexibility in cabinet layout.
Compliance and documentation
The relay carries ATEX certification (DMT 98 ATEX G 001) for gas atmospheres, and its substance prohibitance date of 07/01/2006 aligns with RoHS compliance. The IP20 front and finger-safe touch protection meet IEC 60529 and IEC 60947-1 requirements. For procurement documentation, the brand provides a declaration of conformity and the ATEX certificate; these are typically included with the shipment or available on request.