ATC Diversified Products

SLA Series


The SLA Series is designed to protect three-phase equipment against Phase Loss, Under Voltage, and Phase Reversal conditions.

Any system using 3 phase motors needs Phase Monitor protection.  These monitors operate independently of of motor size or power requirement of the system. 

With normal operating voltages applied in the proper ABC sequence, the internal relay will energize (PICKUP). When incorrect phase sequence or phase loss occurs or the three-phase voltages fall below the drop out voltages, the relay will de-energize (DROPOUT).

Both Delta and Wye systems may be monitored. In Wye systems, connections to neutral are not required.

Here are some typical applications for the SLA series:

  • Air Handlers
  • Conveyor Drive
  • Oil & Gas Pumps
  • Elevator Drives
  • Irrigation Pumps
  • Power Substation Monitoring
  • Lift Station Pumps
  • Robotics Equipment
  • Computer Power Protection
  • Water Waste & Sewage Machinery
  • Sawmill & Woodpump Machinery
  • Automatic Transfer Switching for
  • Emergency Power Supplies
  • Commercial/Industrial Air Conditioning & Refrigeration Compressors
Dropout Voltage 1 Ø Low: 83% of Nominal
3 Ø Low: 90% of Nominal
Response Times Models Up to 300 VAC
Operate: 250 Milliseconds
Release: 0.5 Seconds
  Models Over 300 VAC
Operate: 1.0 Seconds
Release: 2.0 Seconds
Temperatures Operate: 0°C to +55°C
Storage: -45°C to +85°C
Phase Sequence: ABC (Will Not Operate CBA)

CLICK HERE to select the right SLA model. 

Or Contact us at Pacific Parts to help you select the right model for your equipment.