SIEMENS SIRIUS 3RU2136-4EB0 Thermal Overload Relay 22-32 A Class 10

Protect three-phase motors from overheating and phase failure with the SIEMENS SIRIUS 3RU2136-4EB0 thermal overload relay. This compact size S0 device offers a current setting range of 22 to 32 A and Class 10 tripping, making it suitable for normal motor starting duties. It mounts directly onto a contactor or as a standalone unit, providing reliable protection in industrial control panels.

Who is it for

Electrical engineers, panel builders, and maintenance technicians who need dependable motor protection in industrial applications. Ideal for protecting motors up to 32 A in conveyors, pumps, fans, and other machinery.

Main features

• Adjustable current setting from 22 A to 32 A
• Class 10 tripping characteristic for standard motor loads
• Phase failure sensitivity prevents motor damage from single-phasing
• Manual or automatic reset selectable
• 1 NO + 1 NC auxiliary contacts for signaling and control
• Direct mounting to contactors or standalone installation
• Screw terminals for secure wiring

Specifications

• Relay type: Thermal overload relay
• Current setting range: 22 - 32 A
• Size: S0
• Tripping class: CLASS 10
• Number of poles: 3
• Mounting type: Direct mounting to contactor / Stand-alone installation
• Auxiliary contacts: 1 NO + 1 NC
• Reset function: Manual / Automatic
• Phase failure sensitivity: Yes
• Rated insulation voltage (Ui): 690 V
• Rated operational voltage (Ue): 690 V AC
• Connection type: Screw terminals
• Degree of protection: IP20
• Ambient operating temperature: -20 to +60 °C
• Power loss at rated current: 7.2 W
• Product series: SIRIUS 3RU21

Tips

Set the current dial to the motor's full load current for accurate protection. For automatic reset, ensure the control circuit can safely restart the motor after a trip.