SIRIUS 3US Thermal Overload Relay for Reliable Motor Overload Protection – 3US5000-1C8K

🔹 Siemens SIRIUS 3US Thermal Overload Relay – 3US5000-1C8K (Motor Protection Relay)

🔹 Product Description

The Siemens 3US5000-1C8K is a thermal overload relay from the SIRIUS 3US series, designed for reliable protection of low-to-medium current electric motors. It ensures protection against overload, phase failure, and overheating, helping prevent motor damage and unplanned downtime in industrial applications.

This model belongs to the 3US5000 frame range, which is typically used in compact motor starter assemblies for applications such as small pumps, HVAC systems, conveyors, and light industrial machinery. It is generally mounted with Siemens contactors in modular control panel setups.

The relay operates on a bimetal thermal principle, where motor current generates heat through internal elements. If the current exceeds the preset value for a sustained period, the bimetal strip bends and activates the trip mechanism, disconnecting the motor circuit to ensure safe operation.

Based on Siemens 3US series design, this relay provides inverse-time overload protection with phase-loss sensitivity, making it suitable for continuous-duty motor protection in industrial environments.

🔹 Key Features

• Genuine Siemens SIRIUS 3US series thermal overload relay
• Model: 3US5000-1C8K
• 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 detection for added motor safety
• Industrial-grade durability and performance