The SLH Series is designed to protect equipment against PHASE LOSS (single phasing), UNDER VOLTAGE (brown outs), and PHASE REVERSAL (improper sequence). The SLH is unique in that it has a field-adjustable hysteresis.
When correct phase sequence and line voltage are present, the internal relay of the SLH will energize (PICK UP). When there is a phase loss, under voltage or phase reversal condition, the internal relay will de-energize (DROP-OUT). When conditions return to normal, the SLH will automatically reset.
The voltage setting is adjusted to the desired pick-up point indicated by the dial setting. Then, the hysteresis adjustment is set to the desired percentage to achieve the preferred drop-out point. When models up to 300 VAC are set at 0%, they will pick-up and drop-out at the same point, when set at 10%, the drop-out will be an average of the phase-to-phase voltages 10% below the dial setting pick-up point. Models over 300 VAC are adjustable from 0% to 15%.
- Models available up to 480 VAC
- Protects 3-Phase Equipment Against:
- Phase Loss
- Under Voltage
- Phase Reversal
- Lock Shaft Adjustment for:
- Voltage Pick Up
- Drop Out Hysteresis
- Delta or Wye Systems