The Siemens 3RU1116-0JB0-ZW98 is a SIRIUS thermal overload relay in Size S00, Trip Class 10, designed for direct mounting onto a matching contactor. It protects three-phase motor circuits against overload and phase failure by monitoring the current draw and tripping the contactor coil when the thermal model exceeds the trip threshold. The screw-type terminals on both the main and auxiliary circuits accept solid conductors up to 2.5 mm² per the listed wire ranges.
Mounting and Clearance
This relay fastens directly onto the contactor via the contactor mounting method, with no additional DIN-rail footprint required. The mounting position allows rotation of ±135° on a vertical surface and tilting of ±45° forward and backward, which gives panel builders flexibility in tight enclosures. Clearance requirements are zero mm upwards, forwards, and backwards, 6 mm at the side, and zero mm downwards — meaning it can sit flush against adjacent components on three sides provided the 6 mm side gap is maintained.
Auxiliary Contact Ratings and Trip Class
The auxiliary contact circuit carries a rated current of 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V — these are the making and breaking capacities for the control circuit that signals the contactor coil. Trip Class 10 means the relay will trip within 10 seconds at 7.2× the set current, which is the standard for standard-duty motor starting applications where the start-up transient is brief. The per-pole power dissipation is 1.6 W, a figure to include in enclosure thermal calculations when the relay is enclosed.
Environmental and Compliance
The relay is rated for operation from -20 to +70 °C and storage/transport from -55 to +80 °C, with 100 % relative humidity permissible during operation. Shock resistance is 8 g for 10 ms. The IP20 protection on the front means it is finger-safe against accidental contact but not protected against moisture ingress — it belongs inside a panel, not exposed to washdown. The product carries an ATEX type protection designation (DMT 98 ATEX G 001) for use in potentially explosive atmospheres when installed per the applicable system certificate. The lifecycle status is current production.