The Siemens 7UG09910 Core Balance Current Transformer (CBCT) is a dedicated accessory designed for earth fault monitoring and protection systems used with SENTRON 3VA Moulded Case Circuit Breakers (MCCBs). Working in combination with Siemens Earth Fault Monitoring Relays, the CBCT continuously measures residual current and detects earth fault conditions, helping improve electrical safety, equipment protection, and system reliability. Siemens earth fault monitoring solutions are widely used across industrial facilities, commercial buildings, infrastructure projects, and critical power distribution networks.
The 7UG09910 is designed as a Core Balance Current Transformer for 160 Frame, 3 Pole (3P) applications. It forms an essential part of a complete earth fault protection system by detecting current imbalance in three-phase circuits and transmitting fault information to the connected Earth Fault Monitoring Relay for alarm or trip initiation. The 7UG0991x CBCT family is specifically intended for use with Siemens earth fault monitoring solutions.
Earth fault monitoring plays a critical role in modern electrical installations because it helps:
These advantages make the Siemens 7UG09910 CBCT an important component in low-voltage power distribution systems.
The operating principle of the CBCT is based on residual current measurement. Under normal operating conditions, the vector sum of all phase currents passing through the transformer remains balanced. If leakage current flows to earth because of insulation deterioration, cable damage, moisture ingress, or equipment malfunction, the CBCT detects the imbalance and signals the earth fault relay, enabling rapid protective action. Siemens specifies that the protective earth conductor must not pass through the CBCT opening to ensure accurate fault detection.
A major advantage of the 7UG09910 is its suitability for 160 Frame, 3-Pole MCCB installations, making it ideal for industrial feeders, motor control centers, switchboards, manufacturing facilities, utility installations, and commercial electrical systems. Its compact construction allows seamless integration into electrical panels while maintaining reliable monitoring performance.
Manufactured according to Siemens quality standards, the 7UG09910 CBCT delivers dependable long-term performance in demanding industrial environments. When used alongside Siemens SENTRON protection systems, it helps provide enhanced fault detection and improved 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 7UG09910 Core Balance Current Transformer offers dependable earth fault detection and seamless compatibility with Siemens protection systems for industrial and commercial applications.
Whether you are implementing a new earth fault monitoring solution or upgrading an existing protection scheme, the Siemens 7UG09910 delivers the reliability and performance expected from Siemens electrical protection products.
| Specification | Details |
|---|---|
| Product Name | Core Balance Current Transformer (CBCT) |
| Part Number | 7UG09910 |
| SKU | 7UG09910 |
| Brand | Siemens |
| Product Family | SENTRON |
| Product Type | CBCT for Earth Fault Monitoring Relay |
| Function | Earth Fault Monitoring |
| Frame Rating | 160 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 |
| Industrial Use | Yes |
| Manufacturer | Siemens |
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