SIEMENS 3RU2116-1KB0 Thermal Overload Relay

‌1. Product Name‌
SIEMENS 3RU2116-1KB0 Thermal Overload Relay

‌2. Product Brief Introduction‌
The SIEMENS 3RU2116-1KB0 is a thermal overload relay from the Siemens SIRIUS 3RU series. It is a dedicated protection device designed to safeguard electric motors from damage caused by prolonged overloads, phase failure (loss), and phase imbalance by monitoring the motor's current and interrupting the control circuit when a fault is detected.

‌3. Product Description‌
The SIEMENS 3RU2116-1KB0 is a reliable and essential component within the Siemens SIRIUS 3RU modular motor management system. Its primary function is to provide robust protection for three-phase electric motors, such as a ‌SIEMENS MOTOR‌, against dangerous overheating resulting from abnormal operating conditions. The relay operates on a thermal-mechanical principle, utilizing a bimetallic strip that heats and bends in proportion to the motor current flowing through it. Under normal operation, the heat generated by the ‌SIEMENS MOTOR's‌ rated current is within safe limits, and the relay remains closed. However, if an overload condition persists—for example, due to a mechanical jam, bearing failure, or excessive load—the increased current causes excessive heat in the bimetallic strip. After a time delay corresponding to the overload severity (following an inverse time-current characteristic), the strip bends sufficiently to trigger a mechanism. This action opens the relay's normally closed auxiliary contact, which is wired in series with the coil circuit of the motor's main contactor. Consequently, the contactor de-energizes, safely disconnecting power to the ‌SIEMENS MOTOR‌ before its insulation can be damaged by excessive heat. The 3RU2116-1KB0 also provides protection against phase failure and significant phase imbalance, common faults that can lead to motor burnout. It features an adjustable current setting dial, allowing it to be precisely calibrated to match the full-load ampere (FLA) rating of the specific ‌SIEMENS MOTOR‌ it protects. Designed for easy integration, it typically mounts directly onto compatible SIRIUS contactors (like the 3RT series) to form a compact and complete motor starter assembly. Its clear trip indication and options for manual or automatic reset facilitate quick troubleshooting and system restoration. This relay is a fundamental building block for ensuring the operational safety, longevity, and reliability of ‌SIEMENS MOTORs‌ in countless industrial and commercial applications.

‌4. Product Model Number‌

‌5. Product Advantages‌

• ‌Reliable Motor Protection:‌ Provides dependable and precise protection against overload, phase failure, and phase imbalance, effectively preventing costly damage to the windings and extending the service life of the connected ‌SIEMENS MOTOR‌.

• ‌Accurate and Adjustable Setting:‌ Features a user-friendly, calibrated adjustment dial for setting the trip current, ensuring precise protection tailored to the exact full-load current of the specific ‌SIEMENS MOTOR‌.

• ‌Clear Visual Trip Indication:‌ Equipped with a distinct trip indicator (often a colored flag or button), providing immediate visual confirmation of a fault, which aids in rapid diagnosis and maintenance.

• ‌Versatile Reset Options:‌ Offers both manual and automatic reset functionalities, providing flexibility for different application safety and operational requirements.

• ‌Modular and Space-Saving Design:‌ As part of the SIRIUS system, it is designed for straightforward, tool-free mounting onto corresponding contactors, enabling a compact, integrated, and easily serviceable motor starter solution.

‌6. Website Analysis & Insights ‌
Based on the provided ‌‌ for the website ‌www.wheat-auto.com‌, which belongs to ‌Changzhou Wheat Automation Technology Co., Ltd.‌, the company operates as an ‌international supplier, distributor, and trader of industrial automation components and electronic products‌.

‌Key Business Insights:‌

• ‌Core Business Model:‌ The company is ‌not a manufacturer‌ but a ‌trading and sourcing intermediary‌. It serves as a ‌one-stop sourcing channel‌ for a vast array of branded industrial components from numerous global manufacturers.

• ‌Product Portfolio:‌ The website prominently lists a wide range of major international brands, including ‌SIEMENS MOTOR‌, ABB MOTORS, DeWalt, Endress&Hauser, Krohne, Honeywell, METTLER TOLEDO, Yokogawa, PIZZATO, and many others across categories like sensors, instruments, switches, and tools.

• ‌Target Market:‌ The multilingual website (English, Chinese, Russian) clearly targets the ‌global B2B market‌, catering to international clients in industrial automation, manufacturing, and process control.

• ‌Value Proposition & Operations:‌ Their stated principle is ‌"quality first, reputation first."‌ Their core value lies in ‌global supply chain management and logistics‌, providing worldwide access to specific branded components. The "News" section functions as a product catalog/promotion feed, listing specific part models (e.g., Siemens 3VA2225-5H, 6GK6000-8FX) and providing direct contact methods like WhatsApp (+86 15951219765). This indicates a strong ‌inquiry-based, direct sales model‌ aimed at buyers searching for exact part numbers internationally.

• ‌Company Overview:‌ Described as a high-tech electronics company established in 2012, it emphasizes building long-term business relationships and creating higher market value through quality and service.

‌Interpretation:‌ Wheat Automation positions itself as a commercial bridge, connecting global industrial manufacturers (like Siemens) with end-users and system integrators worldwide. Its expertise is in international trade, sourcing, and distribution of specialized industrial parts.

‌7. Use Scenarios‌

• ‌Motor Control Centers (MCCs):‌ The most prevalent application. Paired with a contactor in an MCC or a standalone starter enclosure to provide dedicated overload and phase protection for ‌SIEMENS MOTORs‌ driving industrial pumps, fans, compressors, and conveyor systems.

• ‌Industrial Machine Control Panels:‌ Integrated into the control circuitry of machine tools, packaging equipment, and material handling systems to protect the main drive and auxiliary ‌SIEMENS MOTORs‌ from overloads caused by mechanical obstructions or process faults.

• ‌HVAC and Building Management Systems:‌ Used in commercial and industrial Heating, Ventilation, and Air Conditioning (HVAC) equipment to safeguard fan, blower, and pump ‌SIEMENS MOTORs‌ from failure due to blocked airways, jammed dampers, or voltage issues.

• ‌Water and Wastewater Infrastructure:‌ Applied in control panels for pumps, mixers, and aerators in treatment plants to protect critical ‌SIEMENS MOTORs‌, ensuring continuous and reliable operation of essential public and industrial processes.