The CT-CLAMP-AC is a precision AC current transformer clamp designed for non-intrusive measurement of alternating current in circuit breaker testing, protection studies, and field diagnostics.

Based on dual-range current transformer technology, it provides flexible measurement across two selectable ranges: 20 A for high-resolution low-current signals such as coil and control currents, and 200 A for higher current events including inrush and switching transients.

The clamp delivers proportional voltage outputs of 100 mV/A (20 A range) and 10 mV/A (200 A range), ensuring direct compatibility with oscilloscopes, recorders, and acquisition systems. This allows easy adaptation of measurement sensitivity without changing instrumentation.

Operating exclusively on AC, the transformer-based design provides galvanic isolation between the primary conductor and the measurement system, ensuring safe operation, low-noise signals, and stable performance in electrically disturbed environments.

With a bandwidth of up to approximately 10 kHz, the CT-CLAMP-AC captures dynamic current variations associated with switching operations. It is well suited for analysing circuit breaker opening and closing sequences, including coil energisation and auxiliary circuit behaviour.

In breaker timing applications, the clamp is used to monitor AC coil currents and secondary circuits, providing insight into system performance during operation. Its dual-range capability reduces the need for multiple probes, simplifying field setups.

The compact clamp design, combined with integrated 1.5 m leads and shrouded banana connectors, allows easy installation in confined environments. Its rugged construction ensures consistent performance under demanding field conditions.

By combining dual-range flexibility, galvanic isolation, and wide-band AC measurement, the CT-CLAMP-AC is a reliable tool for circuit breaker diagnostics, protection testing, and power system analysis.