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CTG120 – CORE BALANCE TRANSFORMER 120 MM
Carlo Gavazzi CTG120 core balance transformer with a 120 mm internal diameter and 1000/1 ratio designed for earth leakage current detection applications.
£93.46
Why Choose the Carlo Gavazzi CTG120 Core Balance Transformer?
The Carlo Gavazzi CTG120 is a high-sensitivity core balance transformer designed for detecting earth leakage currents in industrial electrical systems. As part of the Carlo Gavazzi CTG series, it detects differences in current flow through conductors passing through the transformer core and provides a secondary output signal for use with compatible residual current monitoring relays.
The CTG120 features a 120 mm internal diameter and is designed for panel mounting in industrial switchboards, electrical distribution systems and control panels where larger conductor arrangements require increased clearance. The CTG series supports both single-phase and three-phase mains applications and is approved for use with Carlo Gavazzi DEA71 and DEB71 earth leakage monitoring relays.
With a 1000/1 current transformer ratio, a 250 A nominal current rating and a 720 V AC maximum system voltage, the CTG120 provides reliable residual current detection for applications including motors, pumps and electrical equipment where earth leakage protection is required.
Key Advantages
- High-sensitivity core balance transformer for earth leakage current detection.
- 120 mm internal diameter suitable for larger cables and conductor assemblies.
- 1000/1 transformer ratio for residual current monitoring applications.
- Compatible with Carlo Gavazzi DEA71 and DEB71 earth leakage monitoring relays.
- Suitable for single-phase and three-phase electrical systems.
- Robust panel mounting design for industrial protection applications.
Key Features
- Carlo Gavazzi CTG series core balance transformer.
- 120 mm internal aperture.
- 1000/1 current transformer ratio.
- 250 A nominal current rating.
- 50–60 Hz operating frequency.
- 720 V AC maximum system voltage.
- 3 kV AC rated insulation level.
- IP20 protection rating for installation inside electrical enclosures.
Reliable Earth Leakage Detection for Industrial Systems
Core balance transformers such as the Carlo Gavazzi CTG120 detect differences between the current flowing through phase conductors and the neutral conductor. When an imbalance occurs due to leakage current, the transformer generates a secondary signal that can be processed by a residual current monitoring device to provide an alarm or protective disconnection.
The CTG series provides a practical solution for improving electrical safety in industrial installations, helping protect motors, pumps and equipment where insulation faults or leakage currents may create hazardous conditions.
Typical Applications
- Earth leakage monitoring systems.
- Industrial motor protection applications.
- Pump and machinery protection systems.
- Electrical distribution panels.
- Industrial equipment protection.
- Automation and power monitoring installations.
Technical Specifications
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| Mounting Type | Panel / base | |
|---|---|---|
| Device Type | Solid-core CT | |
| IP Rating | IP20 | |
| Manufacturer | Carlo Gavazzi | |
| Series | CTG | |
| Model | CTG120 | |
| Product type | Core balance transformer | |
| Internal diameter | 120 mm | |
| Transformer ratio | 1000/1 | |
| Nominal current | 250 A | |
| Overload current | 1500 A | |
| Short-term thermal current | 50 × In | |
| Dynamic current | 2.5 × Ith | |
| Frequency range | 50–60 Hz | |
| Maximum system voltage | 720 V AC | |
| Rated insulation level | 3 kV AC | |
| Protection rating | IP20 | |
| Dimensions (W × H × D) | 155 × 170 × 20 mm | |
| Weight | Approx. 235 g | |
| Mounting | Panel mounting with fixing flange | |
| Secondary connection | Screw terminals 2 × 2.5 mm² | |
| Operating temperature | -5 to +50 °C | |
| Standards | IEC 61869-2 |
Frequently Asked Questions
What is the Carlo Gavazzi CTG120 used for?
The CTG120 is a core balance transformer used to detect earth leakage currents by monitoring current imbalance in electrical conductors.
What is the internal diameter of the CTG120?
The Carlo Gavazzi CTG120 has a 120 mm internal diameter for routing larger monitored conductors through the transformer.
What is the transformer ratio of the CTG120?
The CTG120 has a 1000/1 transformer ratio for residual current monitoring applications.
Which monitoring relays are compatible with the CTG120?
The CTG120 is designed for use with compatible Carlo Gavazzi earth leakage monitoring relays including the DEA71 and DEB71 series.
Can the CTG120 be used on three-phase systems?
Yes, the CTG120 can be used on both single-phase and three-phase mains systems.
Trusted by Industrial Safety Engineers Worldwide
Carlo Gavazzi CTG core balance transformers are widely used by electrical engineers and automation professionals to improve system safety through reliable earth leakage detection and residual current monitoring.
