SIRIUS 3US Thermal Overload Relay for Reliable Motor Overload Protection – 3US5600-8M8K

Product Description

🔹 Siemens SIRIUS 3US Thermal Overload Relay – 3US5600-8M8K (Motor Protection Relay)

🔹 Product Description

The Siemens 3US5600-8M8K is a thermal overload relay from the SIRIUS 3US series, designed for reliable protection of medium-current electric motors in industrial applications. It safeguards motors from overload, phase failure, and overheating, ensuring safe operation and preventing costly equipment damage.

This model belongs to the 3US5600 frame range, which is typically used in motor starter assemblies and control panels for industrial machinery such as pumps, compressors, conveyors, HVAC systems, and automation equipment. It is commonly mounted with Siemens contactors as part of a modular motor protection system.

The relay operates on a bimetal thermal principle, where motor current passes through heater elements that warm up bimetal strips. When the current exceeds the preset limit for a sustained period, the strip bends and activates the trip mechanism, disconnecting the motor circuit. This provides inverse-time overload protection, meaning higher overload results in faster tripping.

Based on Siemens SIRIUS design standards, this relay is engineered for precise current adjustment, phase-loss protection, and high reliability, making it suitable for continuous-duty industrial motor applications.

🔹 Key Features

• Genuine Siemens SIRIUS 3US series thermal overload relay
• Model: 3US5600-8M8K
• Designed for medium-current motor protection applications
• Bimetal thermal overload protection technology
• Protection against overload and phase failure
• Suitable for industrial motor starter systems
• Compatible with Siemens contactor-based assemblies
• Reliable inverse-time tripping mechanism
• Phase-loss protection for enhanced motor safety
• Industrial-grade durability and long service life