The Megger PSI410 (1001-612) Phase Sequence Tester is an ideal addition to any electrician’s tool kit where currently owned test instruments do not feature phase rotation. The unit provides a quick and simple means of checking phase sequence on motor, pump, and three-phase air conditioning supplies. Electrical work on commercial and industrial installations often requires working on motorized machinery with three phase supplies. Correct sequence of the phases is crucial with certain motors and pumps as damage to brakes and valves will occur in minutes with incorrect phasing.

The PSI410 lets the user know quickly if the phase sequence is correct by using a triple bi-colored LED display and a specific audible tone. The triple bi-colored LED display indicates that all three phases are present. A green LED indicates that the phase is present, while a red LED shows a missing phase connection. Clockwise rotation is indicated by the clockwise rotating green LEDs with a continuous tone and counter-clockwise rotation has counter-clockwise rotating red LEDs and a warbling tone. To avoid the display rotating at the supply frequency, the unit has been designed to provide a slow rotational speed of the display to allow easy indication of rotation.

The unit has a tough rugged case designed for an industrial environment and is supplied with long fused test leads with crocodile clips and prods. The prods have insulated tips that provide less than four millimeters of exposed tip. Dual-phase color-coding has been adopted for the PSI410 to allow ease of use on either brown, black, and gray or red, yellow, and blue color-coded supplies. The PSI410 is self-powered from the supply and requires no batteries.