The Siemens 7UG09915 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 Breaker (MCCB) protection systems. It forms a critical component of earth fault protection solutions by continuously monitoring current imbalance and detecting fault currents flowing to earth, helping protect personnel, equipment, and electrical installations from potentially dangerous fault conditions.
The 7UG09915 is identified by Siemens as a Core Balance CT for Earth Fault Relay (EFR), 630 Frame, 4 Pole (4P). It is specifically designed to work with the Siemens 7UG0861 Earth Fault Monitoring Relay, providing accurate earth fault detection and monitoring in low-voltage power distribution systems.
Earth fault monitoring plays an important role in modern electrical systems because it helps:
By detecting abnormal fault currents early, the Siemens 7UG09915 CBCT helps prevent serious electrical failures and improves overall system protection.
The CBCT operates by measuring the vector sum of all phase currents passing through its core. Under normal operating conditions, the current sum remains balanced. If an earth fault develops, the resulting imbalance is detected by the CBCT and transmitted to the connected earth fault relay, which can initiate alarm or trip actions depending on system configuration. Siemens specifies that all phase conductors (and neutral in 4-wire systems) must pass through the CBCT while the earth conductor must not pass through the transformer opening.
One of the key advantages of the 7UG09915 is its compatibility with 630 Frame, 4-Pole systems, making it suitable for larger industrial feeders, MCCB installations, motor control centers, power distribution panels, and critical electrical infrastructure. The device is engineered for reliable operation and seamless integration with Siemens protection solutions.
Manufactured to Siemens quality standards, the 7UG09915 CBCT offers dependable long-term performance in industrial environments where reliability and electrical safety are essential. It is commonly used in manufacturing facilities, utility installations, commercial buildings, process plants, and infrastructure projects.
At SB Smart (SBSmart.in), we supply genuine Siemens electrical protection components and accessories for industrial applications. The Siemens 7UG09915 Core Balance Current Transformer delivers accurate earth fault detection and reliable integration with Siemens earth fault monitoring systems.
Whether you are implementing a new earth fault monitoring system or upgrading an existing protection scheme, the Siemens 7UG09915 provides the safety, reliability, and performance expected from Siemens protection products.
| Specification | Details |
|---|---|
| Product Name | Core Balance Current Transformer (CBCT) |
| Part Number | 7UG09915 |
| SKU | 7UG09915 |
| Brand | Siemens |
| Product Family | SENTRON |
| Product Type | CBCT for Earth Fault Relay |
| Function | Earth Fault Monitoring |
| Compatible Relay | Siemens 7UG0861 Earth Fault Relay |
| Frame Size | 630 Frame |
| Pole Configuration | 4 Pole (4P) |
| Application | Earth Fault Protection |
| Compatible MCCB Series | SENTRON 3VA |
| Installation Type | Panel Mounted |
| Monitoring Type | Residual Current / Earth Fault Detection |
| Industrial Use | Yes |
| Country of Origin | India |
| Manufacturer | Siemens |
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