Universal 3 phase line monitor, PLMU Series, replaces over 100 competitive products

The most significant benefit of the PLMU11, universal octal plug-in 3 phase line (voltage) monitor, as it applies to plant maintenance, is one part number replaces all popular competitive products. The universal input voltage, 200 to 480 VAC and industry standard octal base wiring eliminates confusion and time lost finding an exact replacement part for OEM equipment or custom control panels. The universal nature of voltage based sensing eliminates questions of proper sizing and adequate protection in the installation. It means the PLUM can protect 3 phase motors from 1 to 1200 hp at 200 to 460 VAC. A user adjustable percent unbalance range and trip delay makes the versatility of this model a complete package which goes beyond the standard features of typical OEM plug-in line monitors. The universal design allows plant maintenance personnel to save significant time and expense whether they stock this item or pull from local distribution shelves. A listing of over 100 competitive part numbers the PLMU replaces is included in the "Related Links" on this page.

3 Phase Motor Protection Provided
The PLMU series provides protection against premature equipment failure caused by voltage faults on the three phase line. Replacing a typical OEM 3 phase line monitor with the PLMU actually improves and extends the level of protection provided. Many of the typical low cost OEM line monitors provide protection based on a voltage averaging design. This design does not provide adequate protection against single phasing when regenerated voltages are present. Regenerated voltages occur whenever a three phase motor is rotating and single phase is lost. The PLMU three phase line monitor uses a second generation microcomputer circuit design that senses under and over voltage, voltage unbalance, phase loss, and phase reversal. Protection is provided even when regenerated voltages are present. The unique autoranging circuitry automatically selects the nominal operating voltage when connected to the incoming supply. The PLMU11 is UL recognized and CSA certified, and backed by an exclusive 10 Year Warranty.

Product of the Year Finalist:
From among the hundreds of entrants for over 14 categories of plant engineering marketplace products, ABB SSAC's PLMU series Universal Three Phase Line Monitor Relay was chosen as a finalist in the Plant Engineering Magazine 11th Annual Product of the Year Awards competition. The PLMU was selected by a special panel of plant engineers from 150 of the years newest and most innovative products. Winners in each category are determined by a mail-in ballot provided with the November issue of the magazine. Each finalists product is featured along with a brief description of the product and it's application. The PLMU series was entered in the category of Electric Motors, Drives & Controls.

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