The Siemens 3RU1116-0HB1 is a SIRIUS thermal overload relay in Size S00, designed for motor protection in control panels. It uses screw-type terminals for the main current circuit and carries a CLASS 10 trip characteristic, meaning it will trip within 10 seconds at 7.2× the set current — standard protection for standard-start induction motors driving pumps, fans, or conveyors. The relay mounts standalone on a DIN rail or directly to a contactor, with a vertical mounting surface that allows ±135° rotation and ±45° tilt front/back, giving panel-builders flexibility in tight enclosures.
What ships in the carton
The 3RU1116-0HB1 ships as a standalone relay — no auxiliary contact block included (0 auxiliary contacts per the spec). The screw terminals accept solid conductors: 1x (20…16 AWG), 1x (18…14 AWG), 1x 12 AWG for the main circuit, and finely stranded with core-end processing: 2x (0.5…1.5 mm²) or 2x (0.75…2.5 mm²) for the control circuit. The IP20 front protection means it's safe for finger contact inside a closed panel, but not for washdown environments. If you need auxiliary signaling (e.g., a remote trip alarm), you'll add a separate auxiliary contact block — that's a separate line item in the kit.
Key ratings and what they mean for fit
The relay is rated for a maximum operating voltage of 690 V AC-3, which covers 400 V and 480 V line-to-line systems common in industrial panels. The CLASS 10 trip class is the standard choice for general-purpose motor starting — it coordinates with most contactors and starters without nuisance tripping on inrush. The Size S00 frame (45 mm wide, 87 mm tall, 78 mm deep) fits the standard SIRIUS mounting grid and mates directly with S00 contactors like the 3RT2 series. Power dissipation at AC in hot operating state is 4.8 W total (1.6 W per pole), so thermal buildup in a dense panel is manageable — no forced cooling required for a single relay.