What this relay is and where it fits
The Siemens 3RU1116-1GB1 is a SIRIUS thermal overload relay, size S00, designed to protect three-phase motor circuits against overload and phase failure. It is a CLASS 10 trip device, meaning it will trip within 10 seconds at 7.2× the current setting — the standard for standard-duty induction motor starting where the start time is under 10 seconds. This relay mounts stand-alone on a DIN rail or directly to a panel, with zero clearance required upwards, forwards, backwards, and downwards; only 6 mm side clearance is needed. The IP20 front protection means it is suited for enclosed panel installation where tools are required to access live parts.
Key ratings and what they mean for your BOM
The 3-pole main current circuit uses screw-type terminals accepting solid wire 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), or AWG 1x (20...16), 1x (18...14), 1x 12. The auxiliary and control circuit also uses screw terminals with the same wire ranges. Each pole dissipates 2.2 W, so for a three-pole relay the total thermal dissipation is 6.6 W — factor that into your enclosure thermal budget. 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, which aligns with IEC 60947-1 overvoltage category III for industrial control panels.
Environmental and compliance
The 3RU1116-1GB1 carries ATEX approval DMT 98 ATEX G 001, permitting use in potentially explosive gas atmospheres. Operating temperature range is -20 to +70 °C, with storage and transport from -55 to +80 °C. It withstands 100 % relative humidity during operation and shock of 8g for 10 ms. The mounting position is flexible: it can be mounted on a vertical surface with ±135° rotation and ±45° tilt front-to-back. RoHS compliance is indicated by a substance prohibitance date of 01.07.2006. The reference code per IEC 81346-2 is F (protective device).