The Siemens 7UG09913 Core Balance Current Transformer (CBCT) is a specialized accessory designed for earth fault monitoring and protection systems used with SENTRON 3VA Moulded Case Circuit Breakers (MCCBs). The CBCT works together with compatible Siemens Earth Fault Monitoring Relays to detect residual current imbalances and identify earth fault conditions before they cause equipment damage, operational downtime, or safety hazards. Siemens protection solutions are widely used across industrial, commercial, and infrastructure applications to improve electrical system safety and reliability.
The 7UG09913 is designed as a Core Balance CT for Earth Fault Relay (EFR), 250 Frame, 4 Pole (4P) applications. It forms an essential part of a complete earth fault monitoring system by continuously measuring the vector sum of currents passing through the conductors enclosed within the transformer core. When an earth fault occurs, the CBCT detects the imbalance and transmits a signal to the monitoring relay for alarm or trip initiation.
Earth fault monitoring is an important protection function because it helps:
These benefits make the Siemens 7UG09913 CBCT a valuable component in modern power distribution systems.
The CBCT is intended for use with Siemens earth fault monitoring relays and SENTRON protection systems. During normal operation, the sum of all phase currents and neutral current (where applicable) remains balanced. If leakage current flows to earth because of insulation failure, damaged cables, moisture ingress, or equipment malfunction, the resulting imbalance is detected by the CBCT and communicated to the relay for corrective action.
One of the key advantages of the 7UG09913 is its suitability for 250 Frame 4-Pole MCCB installations, making it ideal for industrial distribution boards, motor control centers, commercial electrical systems, OEM machinery, and critical infrastructure applications. Its design supports accurate earth fault detection while ensuring seamless integration with Siemens protection architectures.
Manufactured to Siemens quality standards, the 7UG09913 CBCT delivers dependable long-term performance in demanding industrial environments. It is commonly installed in manufacturing plants, commercial buildings, utility facilities, process industries, data centers, and electrical switchboards where reliable earth fault protection is essential.
At SB Smart (SBSmart.in), we provide genuine Siemens protection and monitoring accessories for industrial electrical systems. The Siemens 7UG09913 Core Balance Current Transformer offers reliable earth fault detection and seamless integration with SENTRON protection systems, helping improve safety, reliability, and operational efficiency.
Whether you are implementing a new earth fault monitoring system or upgrading an existing protection scheme, the Siemens 7UG09913 delivers the performance and dependability expected from Siemens electrical protection products.
| Specification | Details |
|---|---|
| Product Name | Core Balance Current Transformer (CBCT) |
| Part Number | 7UG09913 |
| SKU | 7UG09913 |
| Brand | Siemens |
| Product Family | SENTRON |
| Product Type | CBCT for Earth Fault Relay |
| Function | Earth Fault Monitoring |
| Frame Size | 250 Frame |
| Pole Configuration | 4 Pole (4P) |
| Compatible System | SENTRON 3VA MCCB |
| Monitoring Type | Residual Current / Earth Fault Detection |
| Installation Type | Panel Mounted |
| Application | Earth Fault Protection |
| Industrial Use | Yes |
| Manufacturer | Siemens |
No reviews yet.