Testing electrical safety of 3-phase electrical equipment is no easy task. Such equipment is usually large and requires more robust testing than smaller 1-phase devices and equipment. Additionally, it uses less-common 3-phase plugs, which in addition to the tester require the use of testing adapters.
The A 1830 Active 3-phase adapter, for example. It is specifically designed for testing devices with CEE 3-PH/16A or 3-PH/32A 5-pin plugs, and it enables fast and efficient active leakage testing using instruments originally intended for single-phase equipment.
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