SIRIUS 3US Thermal Overload Relay for Reliable Motor Overload Protection – 3US5000-1E8K

🔹 Siemens SIRIUS 3US Thermal Overload Relay – 3US5000-1E8K (Motor Protection Relay)

🔹 Product Description

The Siemens 3US5000-1E8K is a thermal overload relay from the SIRIUS 3US series, designed for reliable protection of electric motors in low-to-medium current industrial applications. It safeguards motors against overload, phase failure, and overheating, ensuring safe operation and preventing equipment damage in continuous-duty environments.

This model belongs to the 3US5000 frame range, commonly used in compact motor starter assemblies such as small pumps, HVAC systems, conveyor systems, and light industrial machinery. It is typically installed with Siemens contactors in control panels for modular motor protection.

The relay operates on a bimetal thermal principle, where motor current generates heat in internal heater elements. When current exceeds the preset limit for a sustained time, the bimetal strip bends and triggers the trip mechanism, disconnecting the motor to prevent damage.

Based on Siemens SIRIUS design philosophy, this relay provides inverse-time delayed overload protection with phase-failure sensitivity, ensuring stable and safe motor operation under fluctuating load conditions.

🔹 Key Features

• Genuine Siemens SIRIUS 3US series thermal overload relay
• Model: 3US5000-1E8K
• 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 performance