PLS120A - PLS Series

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Littelfuse Voltage Monitoring Relays
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The PLS Series is a low cost phase sensitive control that provides an isolated contact closure when the proper A-B-C phase sequence is applied. Protects sensitive 3-phase equipment and equipment operators from reverse rotation. Designed to be compatible with motor overloads or other 3-phase equipment protection devices. Protection for equipment control centers where frequent reconnection or electrical code makes reverse rotation protection essential. Examples include: mobile refrigerated containers, construction equipment, hoists, pumps, conveyors, elevators and escalators.


Operation
The internal relay and LED are energized when the phase sequence is correct. The output relay will not energize if the phases are reversed. Reset is automatic upon correction of the fault.

Property (Mouseover for details) Value
Input Voltage (V) 95 to 135VAC
Input Type 3-phase delta or WYE with no connection to neutral
Input AC Line Frequency (Hz) 50/60Hz
Input Phase Sequence ABC
Maximum Output Voltage (V) 250VAC
Output Type Electromechanical relay energized when the phase sequence is correct
Output Form Isolated SPDT
Output Load Rating (VA) 120 and 240VAC: 10A resistive @ 240VAC; 380 and 480VAC: 8A resistive @240VAC
Drop_out Response Time (ms) ≤50ms
Pull-in Response Time (ms) ≤300ms
Isolation Voltage (V) ≥1500V RMS input to output
Termination Type Octal 8-pin plug-in
Mounting Method Plug-in socket
Operating Temperature -40° to 55°C (-40°F to 131°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Dimensions 3.20 x 2.39 x 1.78 in. (81.3 x 60.7 x 45.2mm)
Weight (lbs/g) ≅6.0oz (170g)