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 | |
|---|---|---|
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.