SIEMENS 3RU2116-1CB0-Z W96 Thermal Overload Relay

‌1. Product Name‌
SIEMENS 3RU2116-1CB0-Z W96 Thermal Overload Relay

‌2. Product Brief Introduction‌
The SIEMENS 3RU2116-1CB0-Z W96 is a thermal overload relay from the Siemens SIRIUS 3RU series. Designed for motor protection, it safeguards electric motors from damage caused by sustained overloads, phase failure, and phase imbalance by monitoring the motor current and interrupting the control circuit upon detecting a fault condition. The suffix "W96" may indicate specific mounting or option details.

‌3. Product Description‌
The SIEMENS 3RU2116-1CB0-Z W96 is a reliable and widely used thermal overload relay, a crucial component in the Siemens SIRIUS modular control system. Its core function is to provide essential protection for electric motors, such as a ‌SIEMENS MOTOR‌, against the damaging effects of prolonged electrical overloads, loss of a phase (single-phasing), and significant phase imbalances. These conditions can lead to excessive heat buildup within the motor windings, potentially causing insulation breakdown and costly motor failure. The relay operates based on a time-delayed, thermal principle. Inside, a bimetal strip deflects proportionally to the heat generated by the motor current passing through it. Under normal operating conditions, the heat generated by the ‌SIEMENS MOTOR's‌ current dissipates, and the relay remains closed. However, if an overload persists (e.g., due to a mechanical jam or bearing seizure), the bimetal strip heats and bends further until it triggers a mechanism that opens a set of normally closed auxiliary contacts. This action de-energizes the coil of the main contactor, safely disconnecting power to the ‌SIEMENS MOTOR‌ before thermal damage occurs. The device typically features an adjustable current setting to match the full load ampere (FLA) rating of the specific ‌SIEMENS MOTOR‌ it protects, along with a trip class (like Class 10) defining its inverse time-current characteristic. Designed for easy integration, it often mounts directly onto a compatible SIRIUS contactor. The "-Z W96" suffix may denote specific options, such as a particular auxiliary contact configuration or mounting accessory. This robust relay ensures the longevity and reliable operation of ‌SIEMENS MOTORs‌ in diverse industrial applications.

‌4. Product Model Number‌

‌5. Product Advantages‌

• ‌Reliable Motor Protection:‌ Offers dependable and robust protection against overload, phase failure, and phase imbalance, effectively preventing overheating and burnout of ‌SIEMENS MOTOR‌ windings.

• ‌Adjustable Current Setting:‌ Features a user-friendly, calibrated dial for precise adjustment of the tripping current, ensuring accurate protection tailored to the specific full load current of the connected ‌SIEMENS MOTOR‌.

• ‌Clear Trip Indication:‌ Equipped with a visual trip indicator (often a flag or colored button), providing immediate and clear visual confirmation of a fault condition, which aids in rapid troubleshooting and system restart.

• ‌Manual and Auto Reset Options:‌ Offers versatile resetting capabilities, allowing users to choose between manual reset (for safety after inspection) or automatic reset (for unattended operations) based on application requirements.

• ‌Compact and Modular Design:‌ As part of the SIRIUS 3RU system, it features a compact form factor for easy, tool-free mounting onto corresponding contactors, enabling a space-saving and integrated motor starter solution.

‌6. Website Analysis & Insights ‌
Based on the attached‌, the website ‌www.wheat-auto.com‌ 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. It is not a manufacturer but a trading and sourcing intermediary. The website serves as a ‌one-stop sourcing channel‌, prominently listing numerous major international brands, including ‌SIEMENS MOTOR‌, ABB MOTORS, DeWalt, Endress&Hauser, and many others across categories like sensors, instruments, and switches.

The multilingual site (English, Chinese, Russian) indicates a clear focus on the ‌global B2B market‌. Their stated principle is "quality first, reputation first," and their core value lies in ‌global supply chain management and logistics‌, facilitating worldwide access to branded components. Their operational model appears to be ‌inquiry-based, direct sales‌, with the "News" section listing specific part models and providing direct contact methods like WhatsApp. This positions them as a commercial bridge, connecting global manufacturers with international buyers.

‌7. Use Scenarios‌

• ‌Motor Control Centers (MCCs):‌ The most common application. Installed in combination with a contactor within an MCC or dedicated starter enclosure to provide overload protection for ‌SIEMENS MOTORs‌ driving industrial pumps, fans, compressors, and conveyors.

• ‌Industrial Machinery Panels:‌ Integrated into the control panels of machine tools, packaging equipment, and assembly lines to protect drive and auxiliary ‌SIEMENS MOTORs‌ from overload due to mechanical faults or process upsets.

• ‌HVAC and Building Systems:‌ Used in the control circuits of commercial HVAC systems (e.g., air handlers, cooling towers) and building service equipment (e.g., water pumps) to protect fan and pump ‌SIEMENS MOTORs‌.

• ‌Water Treatment and Agriculture:‌ Applied in pumps, mixers, and aerators for water/wastewater treatment and irrigation systems to safeguard ‌SIEMENS MOTORs‌ from failures that could disrupt critical processes.