Thermal Overload Relay, Size S00 — CLASS 10, ATEX Rated
The Siemens 3RU1116-1HB0-ZW97 is a SIRIUS brand thermal overload relay (product designation per) in size S00. It provides CLASS 10 trip protection for three-phase motor circuits, with screw-type terminals for both main and auxiliary/control circuits. The part carries ATEX certification DMT 98 ATEX G 001, confirming suitability for use in potentially explosive atmospheres — per IEC 60079, this marking covers Group II gas environments. Mounts directly to a contactor via the fastening method, saving DIN-rail space in the panel.
Key Ratings and What They Mean for Your Panel
CLASS 10 trip class means the relay will trip within 10 seconds at 7.2× the thermal current setting — standard for standard-duty motor starting where the start-up transient is brief. For conveyors or pumps with longer acceleration, CLASS 10 is the correct choice; for high-inertia loads you would step to CLASS 20 or 30. The 3 poles for the main current circuit match a standard three-phase motor. Power loss per pole is 2.2 W, so total dissipation in the enclosure is about 6.6 W under full load — factor that into your panel thermal budget. Surge voltage resistance rated at 6 kV gives the relay a solid coordination level for industrial mains with moderate transient exposure.
Mounting and Environmental Constraints
Mounts on the contactor, not on DIN rail directly. The mounting position allows ±135° rotation and ±45° tilt front/back from a vertical surface — confirm orientation clearance in your enclosure layout. Dimensions: 45 mm width, 87 mm height, 78 mm depth. Clearances required: 0 mm upwards, 0 mm forwards, 0 mm backwards, 0 mm downwards, but 6 mm at the side for air circulation and arc flash separation. Operating temperature range -20 to +70 °C; storage and transport -55 to +80 °C. Shock resistance rated at 8g for 10 ms — adequate for most industrial panels but verify if mounting on a vibrating machine frame. Relative humidity during operation up to 100 % — no derating needed for condensing environments. Protection class IP20 on the front means finger-safe but not washdown-rated; keep the front face out of direct spray.
Wiring and Termination
Solid wire capacities for main contacts: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and 2x 12 AWG. For auxiliary contacts: 2x (20... 16 AWG) and 2x (18... 14 AWG). Finely stranded with core end processing: same as solid. Use ferrules on stranded conductors for reliable termination. The auxiliary contact ratings are given at multiple voltages: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, plus control-circuit values at 110 V (0.22 A,), 125 V (0.22 A,), and 220 V (0.11 A,) — these govern the signal load you can switch through the relay's auxiliary contact block.
Lifecycle and Sourcing
Lifecycle stage is listed as current, meaning the manufacturer has not flagged this order code for discontinuation or phase-out. The part is sourced to order against an RFQ through independent distribution channels — availability and current pricing confirmed at quote time. Substance prohibition date of 07/01/2006 aligns with RoHS compliance; the relay carries ATEX certification and the reference code per IEC 81346-2 is F for protective devices. No official successor order code is published, so the 3RU1116-1HB0-ZW97 remains the direct BOM fit.