SIRIUS 3US Thermal Overload Relay for Reliable Motor Overload Protection – 3US5000-2S8K

Product Description

🔹 Siemens SIRIUS 3US Thermal Overload Relay – 3US5000-2S8K (Motor Protection Relay)

🔹 Product Description

The Siemens 3US5000-2S8K is a thermal overload relay from the SIRIUS 3US series, designed for reliable protection of electric motors in low-to-medium current applications. It safeguards motors from overload, phase failure, and excessive heating, ensuring safe and efficient operation in industrial control systems.

This model belongs to the 3US5000 frame range, commonly used in compact motor starter assemblies for small industrial machines, pumps, HVAC systems, and automation panels. It is typically mounted with Siemens contactors for modular motor protection setups.

The relay operates on a bimetal thermal principle, where motor current heats internal bimetal strips. When the temperature exceeds the set limit for a sustained period, the strip bends and activates the trip mechanism, disconnecting the motor to prevent damage. This provides inverse-time overload protection, meaning higher overload results in faster tripping.

According to Siemens 3US series design, this relay is engineered for precise current matching and phase-failure sensitivity, making it suitable for continuous-duty motor protection in industrial environments.

🔹 Key Features

• Genuine Siemens SIRIUS 3US series thermal overload relay
• Model: 3US5000-2S8K
• Designed for low-to-medium current motor protection
• Bimetal thermal overload protection technology
• Protection against overload and phase failure
• Suitable for compact motor starter systems
• Compatible with Siemens contactor-based assemblies
• Reliable inverse-time tripping mechanism
• Phase-loss protection for improved motor safety
• Industrial-grade durability and long service life