Siemens Overload relay for motor protection, size S2 Part number 3RU2136-4EB0

Product Overview

The Siemens 3RU2136-4EB0 is a SIRIUS thermal overload relay designed for reliable protection of three-phase motors against overload and phase failure. It is intended for direct mounting onto SIRIUS 3RT2 contactors and provides precise thermal protection with adjustable current settings. With Class 10 tripping characteristics, manual and automatic reset options, and integrated auxiliary contacts, this overload relay ensures safe motor operation in industrial control and automation systems.

Key Features

• SIRIUS thermal overload relay for motor protection
• Designed for direct mounting onto SIRIUS 3RT contactors
• Adjustable current setting range: 30 A to 40 A
• Class 10 tripping characteristic for standard motor starting conditions
• Reliable protection against overload and phase failure
• Manual and automatic reset selectable
• Integrated auxiliary contacts for control and signaling
• Compact design for space-efficient motor starter assemblies

Technical Specifications

• Article Number: 3RU2136-4EB0
• Product Family: SIRIUS 3RU21 Thermal Overload Relays
• Device Type: Thermal overload relay
• Current Setting Range: 30 – 40 A
• Tripping Class: Class 10
• Number of Poles: 3
• Auxiliary Contacts: 1 NO + 1 NC
• Mounting: Direct mounting onto SIRIUS 3RT contactors
• Reset Options: Manual or automatic
• Rated Insulation Voltage: 690 V
• Phase Failure Sensitivity: Yes
• Ambient Operating Temperature: −25 °C to +60 °C

Compliance & Standards

• Designed according to IEC 60947-4-1 standards
• Meets Siemens SIRIUS motor protection requirements
• Suitable for global industrial motor control applications

Applications

The Siemens 3RU2136-4EB0 thermal overload relay is used for protecting three-phase motors in motor starters, machinery, pumps, compressors, and industrial automation systems. When combined with a SIRIUS 3RT contactor, it forms a compact and reliable motor starter solution, ensuring motors are safeguarded against overload conditions and phase failure while supporting safe and efficient industrial operation.