What it is and what it does
The Siemens 3RU1116-1AB1-ZX95 is a SIRIUS thermal overload relay in size S00, designed to protect three-phase motors against overcurrent and phase failure. Its Class 10 trip characteristic means it will trip within 10 seconds at 7.2× the set current, matching the thermal curve of standard induction motors during a locked-rotor event. The relay mounts directly to a SIRIUS contactor or stands alone via screw terminals, and the IP20 front protection keeps live parts behind the panel door.
Where it fits in the panel
The S00 frame measures 45 mm wide, 87 mm tall, and 78 mm deep — a compact footprint that leaves room for adjacent contactors and auxiliary blocks on the DIN rail. Stand-alone installation is the intended fastening method, so no adapter plate is needed. The mounting position allows ±135° rotation on a vertical surface and ±45° tilt front-to-back, giving flexibility in tight enclosures. Zero clearance is required upwards, forwards, backwards, and downwards; only 6 mm side clearance is needed.
Ratings that matter for the wire-up
The main circuit uses screw-type terminals accepting 1x (20–16), 1x (18–14), or 1x 12 AWG. Auxiliary and control circuits also use screw terminals, taking 2x (20–16) or 2x (18–14) AWG. For metric builds, the solid and finely stranded ranges are identical: 2x (0.5–1.5 mm²) and 2x (0.75–2.5 mm²). 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. Each pole dissipates 1.9 W, so total heat in the enclosure is 5.7 W for the three poles — factor that into your thermal budget.