Maximum Voltage Ratings of Phase Monitor Relays

Monday: April 14, 2014 : Three-Phase Monitor Relays


Issue:

What is the maximum voltage that your phase monitors can handle? What about the units that offer overvoltage protection?

Solution/Resolution:

Use the table below to determine the maximum continuous voltage rating of all Macromatic Three-Phase Monitor Relays. Voltages in excess of these values could cause damage or improper operation:

  Catalog Number Maximum Voltage
New
(introduced
April 2014)
PAP208, PAP240, PAP400 & PAP480 550V
PCPU 550V
PLPU 550V
PMP120 152V
PMP575 660V
PMPU & FMPU-FA8 550V
Existing PMD120 144V
PMD600 630V
PMDU 576V
Obsolete
(pre-April 2014)
PAP, PCP & PLP 110% of the line-line voltage rating of the product
PMPU 525V
PMP120 144V

The PMP & PMD Series three-phase monitor relays offer overvoltage protection at 110% of line-line voltage. When the system voltage exceeds 110% of the line-line voltage setting of the product, the unit will trip. However, per the table above, both products have sufficient room above the 110% overvoltage trip setting to allow limited operation beyond the trip point.

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