Siemens Industrial Controls 3RU2116-1DB0 Thermal Overload Relay Size Class - 2.2-3.2A S00 10

The Siemens SIRIUS 3RU2116-1DB0 is a 3-pole IEC rated thermal overload relay designed for current-dependent protection of three-phase motors and electrical loads against overload, phase asymmetry, and phase failure. This adjustable relay covers a current range of 2.2 to 3.2 amps and features Class 10 tripping characteristics, providing fast response times under overload conditions.

Key Features:

• Adjustable current range from 2.2 to 3.2 amps for flexible motor protection
• Class 10 tripping: trips in 10 seconds or less during overcurrent situations
• Includes 1 normally open (NO) and 1 normally closed (NC) auxiliary contact
• Manual and automatic reset functionality for convenient operation
• Screw terminal connections on both main and auxiliary circuits for easy installation
• Size S00 design allows direct mounting on Siemens 3RT2015 through 3RT2018 3-pole contactors
• Worldwide approvals including IEC and UL/CSA certifications

The thermal overload relay uses bimetal strips that heat up via integrated heating elements when motor current rises above the set rated current due to overload or phase failure, causing the bimetal strips to deflect and operate the auxiliary contacts through a tripping mechanism. A switching position indicator signals the tripping state, and the relay can be tested for correct function using the integrated TEST slide. This SIRIUS 3RU2 series provides inverse-time delayed protection and is particularly flexible and cost-effective for motor protection applications.