The Siemens 7UG09914 Core Balance Current Transformer (CBCT) is a dedicated earth fault monitoring accessory designed for use with Siemens SENTRON 3VA Moulded Case Circuit Breakers (MCCBs) and the Siemens 7UG0861 Earth Fault Monitoring Relay. This CBCT continuously monitors current imbalance within electrical circuits and enables reliable detection of earth fault currents, helping protect electrical systems, equipment, and personnel from potentially hazardous fault conditions.
The 7UG09914 is specified by Siemens as a Core Balance CT for 630A Frame, 3 Pole (3P) applications. It is designed to work as part of a complete earth fault protection system, where the CBCT senses fault current and communicates with the earth fault relay to trigger alarms or protective tripping when preset fault thresholds are exceeded.
Earth fault monitoring is essential in modern power distribution systems because it helps:
These benefits make the Siemens 7UG09914 CBCT a critical component in industrial and commercial electrical installations.
The CBCT functions 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 due to insulation breakdown, cable damage, moisture ingress, or equipment malfunction, the imbalance is detected by the CBCT and transmitted to the connected earth fault relay for corrective action. Siemens specifies that all phase conductors must pass through the CBCT, while the earth conductor must not pass through it.
One of the major advantages of the 7UG09914 is its suitability for 630A frame 3-pole systems, making it ideal for higher-capacity industrial feeders, MCCBs, motor control centers, switchboards, and power distribution networks. The device integrates seamlessly with Siemens protection systems and delivers reliable long-term monitoring performance.
Manufactured according to Siemens quality standards, the 7UG09914 CBCT offers dependable operation in demanding industrial environments. It is widely used in manufacturing plants, infrastructure projects, utility installations, process industries, commercial facilities, and critical power distribution applications.
At SB Smart (SBSmart.in), we provide genuine Siemens protection and monitoring accessories for industrial electrical systems. The Siemens 7UG09914 Core Balance Current Transformer delivers accurate earth fault detection and seamless integration with Siemens protection relays, helping improve safety and operational reliability.
Whether you are implementing a new earth fault monitoring solution or upgrading an existing protection system, the Siemens 7UG09914 offers the reliability, performance, and safety expected from Siemens SENTRON protection products.
| Specification | Details |
|---|---|
| Product Name | Core Balance Current Transformer (CBCT) |
| Part Number | 7UG09914 |
| SKU | 7UG09914 |
| Brand | Siemens |
| Product Family | SENTRON |
| Product Type | CBCT for Earth Fault Relay |
| Function | Earth Fault Monitoring |
| Compatible Relay | Siemens 7UG0861 Earth Fault Monitoring Relay |
| Frame Rating | 630A Frame |
| Pole Configuration | 3 Pole (3P) |
| Application | Earth Fault Protection |
| Compatible MCCB Series | SENTRON 3VA |
| Installation Type | Panel Mounted |
| Monitoring Type | Residual Current / Earth Fault Detection |
| Industrial Use | Yes |
| Manufacturer | Siemens |
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