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CIBRE-L3, 3-Contact Circuit Breaker Analyser is designed using advanced engineering technology to test contact timings of circuit-breakers. CIBRE-L3 has fast, easy and accurate measurement features by its user-friendly software. CIBRE-L3 is a battery-powered device (optional feature), which allows users to perform tests even without power supply during field tests.

https://www.hightest.co.uk/product/cibre-l3-3-contact-circuit-breaker-timer-with-built-in-printer/