SIRIUS Size S00 thermal overload relay — 3RU1116-1JB0-ZX95
The Siemens 3RU1116-1JB0-ZX95 is a SIRIUS thermal overload relay in the Size S00 frame, designed for contactor mounting on the 3RT2 series. It provides Class 10 trip protection for three-phase motor circuits, with screw-type terminals on both the main and auxiliary/control circuits. The IP20 front protection keeps panel internals safe during operation, and the DMT 98 ATEX G 001 approval qualifies it for use in potentially explosive atmospheres — a key differentiator from standard overload relays.
Mounting and integration — direct-fit on 3RT2 contactors
Fastening method is contactor mounting, meaning it snaps directly onto the matching SIRIUS 3RT2 contactor without additional DIN rail space. The 45 mm width matches the S00 contactor footprint, keeping the assembly compact. Mounting position is flexible: vertical mounting surface with ±135° rotation and ±45° tilt to front/back, so panel layout isn't locked into a single orientation. Clearance requirements are minimal — 0 mm upwards, forwards, backwards, and downwards — with only 6 mm needed at the side. This zero-clearance design lets you pack assemblies tight on the DIN rail.
Electrical ratings and trip performance
Rated for 3-pole main current circuits with a per-pole power loss of 2.2 W. The auxiliary contact ratings cover common control voltages: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V. Surge voltage resistance is rated at 6 kV, giving solid isolation for industrial control panels. The Class 10 trip characteristic means it will trip within 10 seconds at 7.2× the set current — standard for standard-duty motor starting where the start-up transient is brief.
Environmental and mechanical robustness
Operating temperature range is -20 to +70 °C, with storage and transport range of -55 to +80 °C. Relative humidity during operation can reach 100 % — suitable for unconditioned enclosures. Shock resistance is rated at 8g for 10 ms, so it holds up to vibration from contactors and motor starters in the same panel.
Wiring and terminal capacity
Screw-type terminals on both main and auxiliary circuits. Solid wire capacity is 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), with the same spec for finely stranded with core end processing. AWG equivalents: main contacts accept 2x (20... 16), 2x (18... 14), and 2x 12; auxiliary contacts accept 2x (20... 16) and 2x (18... 14). The 78 mm depth and 87 mm height fit standard S00 panel layouts.