Product Description

Siemens 7UG0995 Core Balance Current Transformer (CBCT 310mm) for SENTRON 3VA MCCB

The Siemens 7UG0995 is a high-precision 310 mm Core Balance Current Transformer (CBCT) engineered for advanced earth fault and earth leakage protection systems. Designed specifically to work alongside SENTRON 3VA Moulded Case Circuit Breakers (MCCBs) and Siemens 7UG0842 Earth Leakage Relays, it continuously monitors vector residual currents across power conductors. By detecting micro-ampere to ampere-level leakage currents early, it prevents catastrophic electrical fires, equipment damage, and fatal electric shocks in industrial installations.

Key Features & Technical Details

• Large 310 mm Internal Diameter: Accommodates heavy three-phase power cables, large busbar runs, or high-ampere feeder conductors feeding SENTRON 3VA MCCBs.

• Seamless Relay Compatibility: Specifically engineered to pair with Siemens 7UG0842 series Earth Leakage Relays for accurate signal transformation and fast tripping execution.

• Early Earth Fault Detection: Continuously evaluates vector current balance, sensing insulation degradation and ground leakage before major short-circuit faults occur.

• Industrial-Grade Sensing Accuracy: High magnetic permeability core ensures dependable signal transmission without false tripping from balanced load surges or high-inrush currents.

• Rugged Enclosure Design: Built for extreme thermal and mechanical durability inside low-voltage switchboards, main distribution boards (MDBs), and Motor Control Centers (MCCs).

• Enhanced Facility Safety: Forms a critical component of complete residual current protection (RCD/ELCB) architectures compliant with international electrical safety standards.

Ideal Applications

• SENTRON 3VA MCCB Incomer & Outcomer Feeder Protection

• Main Low-Voltage Distribution Switchboards (MLVDB) & Sub-distribution Panels

• Motor Control Centers (MCCs) & Heavy Industrial Automation Systems

• Data Centers, Hospitals & Commercial Critical Power Infrastructure

• Outdoor/Humid Environments & Processing Plants Prone to Insulation Breakdown

❓ Frequently Asked Questions (FAQs)

Q1: What is the main function of the Siemens 7UG0995 Core Balance Current Transformer (CBCT)?

A: The 7UG0995 CBCT encircles all active power conductors (phases + neutral) to continuously measure vector residual current. When an earth leakage occurs, it detects the unbalanced flux and sends a signal to an Earth Leakage Relay to trip the circuit breaker.

Q2: Which Earth Leakage Relay works with the Siemens 7UG0995 CBCT?

A: It is specifically designed for use with Siemens 7UG0842 series Earth Leakage Relays, forming a complete monitoring and protection unit for SENTRON 3VA MCCBs.

Q3: What does the 310 mm rating represent?

A: The 310 mm measurement refers to the internal window diameter of the CBCT, determining the maximum size/bundle of cables or busbars that can pass through the sensor ring.

Q4: Do I need to pass the Earth ground wire through the CBCT ring during installation?

A: No. Only the active load conductors (L1, L2, L3, and Neutral if present) must pass through the CBCT ring. The protective earth (PE) wire must stay outside the sensor to ensure correct differential current measurement.

🔗 Compatible Accessories & Cross-Selling Products

• Siemens 7UG0842 Series Earth Leakage Relays: Panel-mounted or DIN-rail relays designed to process signals from the 7UG0995 CBCT and trigger MCCB shunt trips.

• Siemens SENTRON 3VA Series MCCBs: Industrial Moulded Case Circuit Breakers compatible with shunt trips driven by earth fault protection systems.

• Siemens 3VA9 Shunt Trips / Undervoltage Releases: Internal MCCB accessories required to automatically trip the 3VA breaker upon receiving a fault signal from the 7UG relay.