The Siemens 7UG09911 Core Balance Current Transformer (CBCT) is a specialized accessory designed for use with Earth Fault Monitoring Relays (EFR) and SENTRON 3VA Moulded Case Circuit Breakers (MCCBs). This CBCT continuously monitors residual current and detects earth fault conditions within electrical installations, helping improve personnel safety, equipment protection, and overall system reliability. Siemens earth fault monitoring solutions are widely used in industrial power distribution systems, commercial facilities, infrastructure projects, and critical electrical networks.
The 7UG09911 is designed as a Core Balance Current Transformer for 160 Frame, 4 Pole (4P) applications, making it suitable for earth fault monitoring in four-pole MCCB systems where accurate residual current detection is required. It works together with Siemens Earth Fault Monitoring Relays such as the 7UG0861 series, forming a complete earth fault protection solution.
Earth fault monitoring is an essential protection function because it helps:
By identifying leakage and fault currents before they escalate into major failures, the Siemens 7UG09911 CBCT helps maintain continuity and safety within 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 and neutral current passing through the transformer remains balanced. If an earth fault occurs due to insulation deterioration, damaged cables, moisture ingress, or equipment malfunction, the resulting imbalance is detected by the CBCT and transmitted to the connected monitoring relay for alarm or trip action.
A major advantage of the 7UG09911 is its compatibility with 160 Frame, 4-Pole MCCB installations, making it suitable for distribution boards, motor control centers, industrial machinery, OEM equipment, commercial electrical systems, and utility applications. Its compact design allows easy integration into switchboards and protection panels while maintaining reliable monitoring performance.
Manufactured according to Siemens quality standards, the 7UG09911 CBCT delivers dependable long-term performance in demanding industrial environments. It is commonly used in manufacturing plants, process industries, infrastructure projects, commercial buildings, data centers, and electrical distribution systems where reliable earth fault protection is critical.
At SB Smart (SBSmart.in), we supply genuine Siemens protection and monitoring accessories that help improve electrical safety and system reliability. The Siemens 7UG09911 Core Balance Current Transformer provides dependable earth fault detection and seamless integration with Siemens SENTRON protection solutions for industrial and commercial applications.
| Specification | Details |
|---|---|
| Product Name | Core Balance Current Transformer (CBCT) |
| Part Number | 7UG09911 |
| SKU | 7UG09911 |
| Brand | Siemens |
| Product Family | SENTRON |
| Product Type | CBCT for Earth Fault Monitoring Relay |
| Function | Earth Fault Monitoring |
| Frame Rating | 160 Frame |
| Pole Configuration | 4 Pole (4P) |
| Compatible System | SENTRON 3VA MCCB |
| Compatible Relay | Siemens 7UG0861 Earth Fault Monitoring Relay |
| Monitoring Type | Residual Current / Earth Fault Detection |
| Installation Type | Panel Mounted |
| Application | Earth Fault Protection |
| Industrial Use | Yes |
| Manufacturer | Siemens |
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