Siemens Industrial Controls 3RU2116-1EB0 Relay

If you are field-servicing motor control centers, the Siemens 3RU2116-1EB0 is a standard-issue thermal overload relay designed specifically for S00 frame size contactors. This SIRIUS motor protection device operates on an adjustable 2.8 to 4 AMP range, providing precise current-dependent protection for three-phase motors. Built with a Class 10 trip rating, it ensures a reliable response within 10 seconds during overcurrent events, effectively preventing winding damage from phase failure or phase asymmetry. This bimetallic relay features a 3-pole design and integrates seamlessly with 3RT2015 through 3RT2018 contactors via direct mounting. The hardware includes one normally open (NO) and one normally closed (NC) auxiliary contact for fault signaling, along with a selectable manual-automatic reset function. For contractors handling IEC rated motor starters, the IP20 finger-safe screw terminals and integrated TEST/STOP slide make this unit a reliable choice for maintaining system uptime in harsh environments.

• Optimized Compatibility: Direct mounting for SIRIUS S00 contactors reduces panel space and wiring labor.
• Enhanced Motor Safety: Integrated phase loss sensitivity prevents motor burnout during single-phasing conditions.
• Long-Term Stability: The bimetallic tripping characteristic provides consistent performance in ambient temperatures ranging from -40°F to 140°F.
• Versatile Reset Modes: Field-selectable manual or automatic reset allows for tailored control logic in remote or accessible applications.
• Diagnostic Indicators: Visible switching position indicator allows for rapid troubleshooting during circuit inspections.

Which contactors are compatible with the 3RU2116-1EB0?
This relay is engineered for direct connection to Siemens SIRIUS Size S00 contactors, specifically models 3RT2015, 3RT2016, 3RT2017, and 3RT2018.

Can this relay be used for single-phase motor protection?
Yes, although it is a 3-pole device, it can protect single-phase loads by wiring the poles in series to ensure all bimetal strips are heated evenly.

What is the difference between Class 10 and Class 20 tripping?
The Class 10 rating on this relay means it will trip in 10 seconds or less at 6 times the set current, making it ideal for standard motor starts without high-inertia loads.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.