What This Part Is and Where It Fits
The Siemens 3RU1116-1DB0-ZW98 is a SIRIUS thermal overload relay in size S00, designed for three-phase motor protection in control panels. It mounts directly onto a contactor via the contactor mounting fastening method, saving DIN-rail space and simplifying wiring in the motor starter assembly.
Key Ratings and What They Mean for Fit
Trip class 10 means the relay will trip within 10 seconds at 7.2× the set current, matching standard induction motor starting profiles — adequate for most pump, fan, and compressor loads that do not require extended acceleration. The 3-pole configuration covers all three phases of the main current circuit, so a single device provides overload and phase-loss protection on a three-phase motor. The relay is ATEX approved under DMT 98 ATEX G 001, which certifies it for use in potentially explosive gas atmospheres. This Ex marking is the deciding factor for oil-and-gas or chemical-plant panels: confirm the Ex marking against your zone classification before specifying, per IEC 60079. Rated surge voltage resistance of 6 kV (per IEC 60947-1) provides adequate insulation coordination for 400 VAC systems with overvoltage category III. The IP20 protection on the front means the relay is touch-safe inside an enclosure but not suitable for washdown or outdoor exposure without a separate cabinet. Operating temperature range of -20 to +70 °C covers most indoor panel environments; storage and transport range extends to -55 to +80 °C. Shock resistance of 8g for 10 ms is typical for industrial panel mounting on a contactor — it will hold calibration under normal vibration but not under repeated hammering.
Mounting and Integration
Size S00 dimensions are 45 mm wide, 87 mm high, and 78 mm deep — compatible with the SIRIUS 3RT2 contactor series of the same frame size. The contactor mounting method clips the relay directly onto the contactor without additional DIN-rail space; the mounting position allows ±135° rotation and ±45° tilt on a vertical surface, giving panel builders flexibility in orientation. Clearance requirements: zero mm upwards, forwards, backwards, and downwards; 6 mm at the side. This tight clearance envelope means the relay can be packed closely with adjacent devices, though the 6 mm side gap must be maintained for heat dissipation during Class 10 tripping events. Screw-type terminals on both main and auxiliary circuits accept solid conductors: 2×(0.5…1.5 mm²) and 2×(0.75…2.5 mm²), with AWG equivalents for the main contacts: 2×(20…16), 2×(18…14), and 2×12. The auxiliary circuit terminals accept 2×(20…16) and 2×(18…14) AWG. Finely stranded conductors with core end processing use the same cross-section ranges.
Lifecycle and Sourcing Reality
Compliance documentation includes ATEX certificate DMT 98 ATEX G 001. The substance prohibitance date of 07/01/2006 aligns with RoHS compliance (EU RoHS effective July 2006). The reference code per IEC 81346-2 is F, used for protection devices in functional system documentation.