Siemens 3RU2116-1EB0 Thermal Overload Relay 2.8-4A Class 10

The Siemens 3RU2116-1EB0 is a SIRIUS 3-pole thermal overload relay designed for current-dependent motor protection against overload and phase failure. This Class 10 relay features an adjustable current range from 2.8 to 4.0 amps and trips in 10 seconds or less during overcurrent conditions, making it ideal for protecting motors and electrical loads with normal starting characteristics.

Key Features:

• Adjustable current range: 2.8 to 4.0 amps for precise motor protection
• Class 10 tripping characteristic for fast response to overload conditions
• Size S00 design optimized for direct mounting to Siemens 3RT201 contactors
• Maximum rated operating voltage: 690V AC
• Auxiliary contacts: 1 NO (normally open) and 1 NC (normally closed)
• Screw terminals for both main and auxiliary circuits
• Manual or automatic reset capability after recovery time
• Visual tripping indicator shows relay status at a glance
• TEST function for verifying correct operation after installation
• STOP function for additional control capability
• Suitable for use with variable frequency drives (VFDs)

The relay uses bimetal strip technology with heating elements to detect overcurrent conditions. When an overload or phase failure occurs, the increased current heats the bimetal strips, causing them to bend and trigger the auxiliary contacts through a tripping mechanism. These contacts then disconnect the load via a contactor. The relay can be mounted individually or directly onto compatible Siemens 3RT contactors for space-saving installation. Certified to international standards including ATEX and IECEx for explosion protection applications.