A258B 3-Phase Power Monitor
[A258B]

480VAC, 60Hz, 3.7W, Adjustment Range: 380-480VAC, Automatic Reset

The Time Mark A258B monitors 3 phase power lines for faulty conditions. When the A258B is properly adjusted it will detect phase loss on a loaded motor in the presence of regenerated voltage.

A neutral connection is not needed with the A258B and it can be used with Delta and Wye systems. The A258B can be adjusted to meet existing conditions.

"Trip" and "Norm" indicators are located on the front.