Phase Sequence Monitor/Relays

ALE Surface Mount
 

ASA Socket Mount


Phase SLA Manual

 

MONITOR/RELAY OVERVIEW

The ATC Diversified SLA Series is designed to protect 3-phase equipment against Phase Loss, Under Voltage and Phase Reversal conditions.  With normal operating voltages applied in the p[roper ABC sequence, the internal realy will energize (pick-up).  When incorrect phase sequence or phase loss occurs or the 3-phase voltages fall below the drop out voltages, the relay will de-energize (drop-out).  An LED indicator glows when all line conditions are normal.  Both Delta and Wwye systems may be monitored.  In Why systems, connections to neutral are NOT required.

Note:  When a phase is lost while the motor is running, a condition known as regeneration occurs where a voltage is induced into the open phase nearly equal in magnitude to the normal phase-to-phase voltage.  However, with the exception of lightly loaded motors, enough change is detected by the SLA to provide the required protection when properly adjusted.

 

PURCHASE MONITOR/RELAYS

ITEM NUMBER DESCRIPTION PRICE

QTY SLA230ASA

Socket Mount Phase/Volt Monitor, 190-270 VAC
$83.00

QTY SLA440ASA

Socket Mount Phase/Volt Monitor, 430-480 VAC
$96.00

QTY RB08

8-Pin Socket Base
$7.00

QTY SLA230ALE

Surface Mount Phase Monitor, 190-270 VAC
$167.00

QTY SLA440ALE

Surface Mount Phase Monitor, 430-480 VAC
$174.00

SPECIFICATIONS

Drop-Out Voltage 90% of Normal
Phase Sequence ABC (Will Not Operate on CBA Sequence)
Reset Automatic
Relay SPDT, 10A Resistive, 345 VA Inductive
Indicator LED (Glows on all normal condition)
Response Times Up to 300 VAC: 250 ms operate, 0.5 sec release
Over 300 VAC: 1.0 sec operate, 2.0 sec release
Temperature Ratings Operate: 30 to 131 degrees F (0-55 C)
Storage: -49 to 185 degrees F (-45 to 85 C)
Enclosure Lexan Dust Cover
Dimensions Style A: 3.10 H x 2.38 W x 1.75 D (inches)
Style E: 3.00 H x 3.25 W x 4.00 D (inches)