The Siemens 7UG0994 Core Balance Current Transformer (CBCT) is a specialized accessory designed for earth fault and earth leakage protection systems used with SENTRON 3VA Moulded Case Circuit Breakers (MCCBs). The CBCT works alongside Siemens Earth Leakage Relays (ELRs) to continuously monitor residual current and detect leakage currents flowing to earth, helping prevent electrical hazards, equipment damage, and fire risks.
The 7UG0994 is a 210 mm diameter CBCT designed specifically for use with Siemens earth leakage monitoring relays. It forms an essential component of a complete earth leakage protection system by sensing imbalance currents and transmitting the signal to the monitoring relay, which can then initiate protective tripping of MCCBs, ACBs, MCBs, or other protective devices when leakage current exceeds the configured threshold.
Earth leakage protection plays a critical role in modern electrical installations by helping to:
These benefits make the Siemens 7UG0994 CBCT an important component in industrial, commercial, and infrastructure power distribution systems.
The operating principle of the 7UG0994 is based on residual current monitoring. Under normal conditions, the vector sum of all currents passing through the CBCT is zero. If a leakage current develops due to insulation breakdown, moisture ingress, damaged cables, or equipment faults, the CBCT detects the imbalance and signals the connected earth leakage relay. The relay can then trigger protective action to isolate the faulty circuit.
A major advantage of the Siemens 7UG0994 is its 210 mm internal diameter, which makes it suitable for medium-to-large cable bundles, feeder circuits, distribution panels, and industrial power systems where smaller CBCTs may not provide sufficient conductor clearance.
The CBCT is designed for compatibility with Siemens Earth Leakage Relays including the 7UG0842 Series. Siemens specifies that all phase conductors and neutral conductors must pass through the CBCT, while the protective earth conductor must never pass through the transformer opening. This ensures accurate residual current measurement and reliable fault detection.
Manufactured to Siemens quality standards, the 7UG0994 delivers dependable long-term performance and seamless integration with SENTRON protection systems. It is widely used in industrial facilities, motor control centers, commercial buildings, process plants, utility installations, and critical infrastructure projects where enhanced electrical safety is required.
At SB Smart (SBSmart.in), we supply genuine Siemens electrical protection products designed to improve safety, reliability, and operational efficiency. The Siemens 7UG0994 CBCT provides accurate earth leakage detection and seamless integration with Siemens SENTRON protection solutions.
Whether you are implementing a new earth leakage protection system or upgrading an existing MCCB installation, the Siemens 7UG0994 delivers the reliability, performance, and protection expected from Siemens electrical safety products.
| Specification | Details |
|---|---|
| Product Name | Core Balance Current Transformer (CBCT) |
| Part Number | 7UG0994 |
| SKU | 7UG0994 |
| Brand | Siemens |
| Product Family | SENTRON |
| Product Type | CBCT for Earth Leakage Relay |
| Function | Earth Leakage Monitoring |
| Application | Earth Fault & Earth Leakage Protection |
| Internal Diameter | 210 mm |
| Current Monitoring Range | 10 mA – 30 A |
| Compatible Relay Series | Siemens 7UG0842 Earth Leakage Relay |
| Compatible MCCB Series | SENTRON 3VA MCCB |
| Installation Type | Panel Mounted |
| Certification | CE, RoHS |
| Color | Black |
| Country of Origin | India |
| Manufacturer | Siemens |
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