What It Is and What It Does
The Siemens 3RU2116-0KC1 is a SIRIUS-brand thermal overload relay, size S00, with a Class 10 trip characteristic. The auxiliary switch is integrated into the body, so there's no separate add-on block needed for the trip/alarm signal. The note "for message 'Tripped'" on the listing refers to this integrated contact — it changes state when the relay trips, giving the PLC or annunciator a clean signal.
Key Ratings and What They Mean for Fit
Rated insulation voltage is 690 V, and the relay is rated for AC-3e switching up to that same voltage. At 400 V it's good for 0.37 kW motor load; at 690 V it handles 0.75 kW. Those power figures are the practical selection guide — match them to the motor nameplate, not the contactor rating. Auxiliary contact ratings cover both AC and DC control circuits: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, 0.75 A at 690 V. That means the trip signal contact can switch a 24 VDC PLC input directly without an interposing relay, as long as the load stays under 2 A. Spring-loaded terminals accept 2x (0.5 to 2.5 mm²) solid or stranded wire. No screw-clamping — just strip, insert, and push the spring. That saves time on the panel build but means you need the right screwdriver (3 mm diameter, 3.0 x 0.5 mm tip) to release the spring. Dimensions are 45 mm wide, 79 mm deep, 102 mm tall. Size S00 is the smallest Siemens overload relay footprint — it clips directly onto the matching S00 contactor or can be mounted stand-alone. It fits any mounting position, which helps when you're squeezing it into a tight enclosure.
Environmental and Lifecycle Reality
Operating temperature range is -40 to +70 °C, with temperature compensation active from -40 to +60 °C. Storage and transport range is -55 to +80 °C. That covers most industrial environments short of a foundry or freezer tunnel. The substance prohibitance date of 10/01/2009 indicates RoHS compliance is in place. MTTF with high demand rate is listed at 2,280 years.
Where It Goes in a Panel
The relay is sized for the S00 contactor footprint and can be mounted stand-alone. Spring-loaded terminals face forward. Wire range of 0.5 to 2.5 mm² per clamp. The 45 mm width matches standard DIN-rail spacing.