Overload relay 110...160 A CT operated Size S6 Class 10 - 3RU2156-5DB10-8K

Product Description

Siemens SIRIUS Thermal Overload Relay – 110–160 A, CT Operated, Size S6, Class 10 – 3RU2156-5DB10-8K

The Siemens 3RU2156-5DB10-8K is a SIRIUS 3RU2 series thermal overload relay designed for reliable protection of three-phase induction motors against overload, phase failure, and overheating conditions. It is widely used in motor control centers (MCC), industrial starter panels, HVAC systems, pumps, compressors, and conveyor systems where dependable motor protection is required.

This relay is designed for Size S6 contactor compatibility and supports a current setting range of 110–160 A, making it suitable for medium to heavy-duty industrial motors. It operates on the bimetal thermal principle, ensuring accurate tripping under sustained overload conditions to prevent motor damage.

Being a CT-operated (current transformer compatible) version, it is suitable for higher current motor applications where external CTs are used for sensing and protection coordination. The relay also follows Class 10 tripping characteristics, ensuring fast response and enhanced motor safety.

Key Features

• Siemens SIRIUS 3RU2 thermal overload relay
• Current range: 110–160 A
• CT operated design for high-current motor applications
• Motor protection against overload and phase loss
• Class 10 tripping characteristic (fast motor protection)
• Compatible with Size S6 contactors (3RT series)
• Direct mounting / panel integration
• Manual / automatic reset selectable
• High reliability bimetal mechanism
• IEC 60947-4-1 compliant