Carlo Gavazzi CTG035 core balance transformer with a 35 mm internal diameter and 1000/1 ratio designed for earth leakage current detection applications.
£42.57
The Carlo Gavazzi CTG035 is a sensitive core balance transformer designed for detecting earth leakage currents in single-phase and three-phase electrical systems. As part of the Carlo Gavazzi CTG series, it monitors current imbalance through conductors passing through the transformer core and provides a secondary signal for use with compatible earth leakage monitoring relays.
The CTG035 features a compact 35 mm internal diameter and is designed for easy installation in electrical panels and industrial control systems. It is approved for use with Carlo Gavazzi DEA71 and DEB71 earth leakage monitoring relays, providing reliable protection against potentially hazardous current leakage conditions.
With a 1000/1 transformer ratio, an 80 A nominal current rating and support for systems up to 720 V AC, the CTG035 provides accurate residual current detection for applications including motors, pumps and electrical equipment installed in metallic structures.
Core balance transformers such as the Carlo Gavazzi CTG035 detect differences between 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 an earth leakage 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.
| Manufacturer | Carlo Gavazzi |
|---|---|
| Series | CTG |
| Model | CTG035 |
| Product type | Core balance transformer |
| Internal diameter | 35 mm |
| Transformer ratio | 1000/1 |
| Nominal current | 80 A |
| Overload current | 480 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) | 64 × 74 × 20 mm |
| Weight | Approx. 80 g |
| Mounting | Panel mounting / DIN rail adapter |
| Secondary connection | Screw terminals 2 × 2.5 mm² |
| Operating temperature | -5 to +50 °C |
| Standards | IEC 61869-2 |
The CTG035 is a core balance transformer used to detect earth leakage currents by monitoring current imbalance in electrical conductors.
The Carlo Gavazzi CTG035 has a 35 mm internal diameter for routing monitored conductors through the transformer.
The CTG035 has a 1000/1 transformer ratio for residual current monitoring applications.
The CTG035 is designed for use with compatible Carlo Gavazzi earth leakage monitoring relays including the DEA71 and DEB71 series.
Yes, the CTG035 can be used on both single-phase and three-phase mains systems.
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.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...