The Siemens 7UG09912 Core Balance Current Transformer (CBCT) is a dedicated accessory designed for use with Siemens Earth Fault Monitoring Relays (EFR) and SENTRON 3VA Moulded Case Circuit Breakers (MCCBs). It continuously monitors residual current and detects earth fault conditions, helping protect electrical installations, equipment, and personnel from hazardous fault currents. The CBCT is specifically designed to operate with Siemens 7UG0861 Earth Fault Monitoring Relays, providing reliable fault detection and system protection.
The 7UG09912 is identified by Siemens as a Core Balance CT, 250 Frame, 3 Pole (3P) model. It is intended for 3-phase, 3-wire systems, where conductors L1, L2, and L3 pass through the CBCT opening. Siemens specifies that the protective earth conductor must not pass through the transformer to ensure accurate earth fault monitoring.
Earth fault protection is an essential safety function in modern power distribution systems because it helps:
By continuously monitoring current imbalance, the Siemens 7UG09912 CBCT helps identify developing faults before they become critical system failures.
The CBCT functions by measuring the vector sum of all currents flowing through the conductors enclosed within its core. Under normal operating conditions, the sum remains balanced. If current leaks to earth because of insulation breakdown, cable damage, moisture ingress, or equipment malfunction, the imbalance is detected and transmitted to the connected Earth Fault Monitoring Relay, which can initiate alarms or trip actions based on configured settings.
One of the key advantages of the 7UG09912 is its suitability for 250 Frame, 3-Pole MCCB installations, making it ideal for industrial feeders, switchboards, motor control centers, commercial electrical systems, and manufacturing facilities. Its compact design enables easy integration into existing protection schemes while maintaining reliable monitoring performance.
Manufactured according to Siemens quality standards, the 7UG09912 CBCT delivers dependable long-term performance in demanding industrial environments. It forms an important part of Siemens SENTRON protection solutions, helping improve system safety and operational continuity.
At SB Smart (SBSmart.in), we provide genuine Siemens protection and monitoring accessories designed to improve safety, reliability, and operational efficiency. The Siemens 7UG09912 Core Balance Current Transformer offers accurate earth fault detection and seamless compatibility with Siemens earth fault monitoring systems.
Whether you are implementing a new earth fault monitoring solution or upgrading an existing protection system, the Siemens 7UG09912 delivers the performance and dependability expected from Siemens electrical protection products.
| Specification | Details |
|---|---|
| Product Name | Core Balance Current Transformer (CBCT) |
| Part Number | 7UG09912 |
| SKU | 7UG09912 |
| Brand | Siemens |
| Product Family | SENTRON |
| Product Type | CBCT for Earth Fault Monitoring Relay |
| Function | Earth Fault Monitoring |
| Frame Rating | 250 Frame |
| Pole Configuration | 3 Pole (3P) |
| Compatible Relay | Siemens 7UG0861 Earth Fault Monitoring Relay |
| Compatible MCCB Series | SENTRON 3VA MCCB |
| System Type | 3 Phase, 3 Wire |
| Monitoring Type | Residual Current / Earth Fault Detection |
| Installation Type | Panel Mounted |
| Application | Earth Fault Protection |
| Country of Origin | India |
| Manufacturer | Siemens |
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