Protection Relays Voltage Monitoring Relays PLR SERIES Description The PLR Series provides a cost effective means of preventing 3-phase motor startup during adverse voltage conditions. Proper A-B-C sequence must occur in order for the PLRs output contacts to energize. In addition, the relay will not energize when an undervoltage or phase loss condition is present. The PLR Series protects a motor against undervoltage operation. The adjustment knob sets the undervoltage trip point. 8-PIN Operation The output relay is energized and the LED glows when all voltages are acceptable and the phase sequence is correct. Undervoltage must be sensed for a continuous dropout delay period before the relay de-energizes. Reset is automatic upon correction of the fault condition. The output relay will not energize if a fault condition is sensed as power is applied. Wiring Diagram Field Adjustment: Turn the adjustment knob fully counterclockwise and apply three-phase power. The LED should be ON. Increase adjustment until the LED goes OFF. Decrease F = Fuses adjustment until LED glows again. If nuisance tripping occurs, A = Phase A = L1 decrease the adjustment slightly. B = Phase B = L2 C = Phase C = L3 NO = Normally Open NOTE: When properly adjusted and operating in an average system, a voltage unbalance of 10% NC = Normally Closed or more is required for phase loss detection. When a phase is lost while the motor is running, a voltage will be induced into the open phase nearly equal in magnitude to the normal phase-to- phase voltage. This condition is known as regeneration. When regenerated voltages are present, Relay contacts are isolated the voltage unbalance during single phasing may not exceed 10% for some motors. The PLR Series may not provide protection under this condition. For systems that require superior phase 2A fast acting fuses recommended for loss protection, select the PLMU Series. safety (not required). Features & Benefits FEATURES BENEFITS Prevents 3-phase motor startup when undervoltage Continuous monitoring or phase loss condition is present Industry standard 8-pin Eliminates need for special connectors octal plug connection Quick visual indication of output status and correct LED indication phase sequence Ordering Information MODEL LINE VOLTAGE PLR120A 95 to 140VAC PLR240A 190 to 270VAC PLR380A 340 to 450VAC PLR480A 380 to 500VAC If you dont find the part you need, call us for a custom product 800-843-8848 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062716 wwwwww.littelfuse.com/.littelfuse.com/plrProtection Relays Voltage Monitoring Relays PLR SERIES Accessories Specifications Line Voltage BZ1 Front Panel Mount Kit Type 3-phase delta or wye with no connection Provides an easy method of through-the-panel to neutral mounting of 8- or 11-pin plug-in timers, flashers, Nominal Voltage Undervoltage and other controls. Dropout Adj. Range Line Voltage Max. 120VAC 85 to 130VAC 143VAC OT08PC Octal 8-pin Socket 240VAC 170 to 240VAC 270VAC 8-pin 35mm DIN rail or surface mount. Rated at 380VAC 310 to 410VAC 480VAC 10A 600VAC. Surface mounted with two 6 480VAC 350 to 480VAC 530VAC screws or snaps onto a 35 mm DIN rail. AC Line Frequency 50/60Hz Phase Sequence ABC LPSM003ZXID (Indicating), Response Times LPSM003Z (Non-indicating) Fuse Holders Pull-in 400ms Littelfuse POWR-SAFE Dead Front holders Drop-out 100ms provide optimum protection to personnel for Hysterisis Class CC and Midget-Style fuses. 600 VAC/DC Pull-in/Drop-out 2% 0KLK002.T Midget Fuse (2 Amp) Output 10 x 38 fast acting, high-interrupting capacity, Type Electromechanical relay, energized when all current-limiting type fuse. 600 Vac/500 Vdc voltages are acceptable Form SPDT C103PM (AL) DIN Rail Rating 5A resistive 240VAC, 1/4 Hp 120VAC 35 mm aluminum DIN rail available in a 36 in. Maximum Voltage 250VAC (91.4 cm) length. Protection Phase Reversal/Failure ASME A17.1 Rule 210.6 Motors and Generators NEMA MG1 14:30, 14:35 Surge IEEE C62.41-1991 Level B Isolation Voltage 120 & 240VAC 1500V RMS input to output 380 & 480VAC 2500V RMS input to output Mechanical Dimensions H 81.3 mm (3.2) W 60.7 mm (2.39) D 45.2 mm (1.78) Mounting* Plug-in socket Termination Octal 8-pin, plug-in Environmental Operating/Storage Temperature 0 to 55C / -40 to 85C Weight 6 oz (170 g) *CAUTION: Select an octal socket rated for 600VAC operation. 2016 Littelfuse Protection Relays & Controls Rev: 1-A-062716 wwwwww.littelfuse.com/.littelfuse.com/plr