UVR, OVR, CVR, PFR, POR AC Voltage Relays

A discontinued range of DIN-rail/surface mounted AC voltage relays, for monitoring and protection of mains and generator power systems. There is no direct Murphy equivalent.

Sales Bulletin (ms6261)

Standard models:

Single-phase and neutral monitoring:
UVR100: under voltage relay, 160-240V AC ph-N trip setting, 2-26V AC reset differential
OVR100: over voltage relay, 200-280V AC ph-N trip setting, 2-26V AC reset differential
CVR100: combined under/over voltage relay, UVR100 & OVR100 in a single case
UVR101: under voltage relay, 90-130V AC ph-N trip setting, 1-13V AC reset differential
OVR101: over voltage relay, 110-150V AC ph-N trip setting, 1-13V AC reset differential
CVR101: combined under/over voltage relay, UVR101 & OVR101 in a single

Three-phase and neutral (4-wire) monitoring:
UVR500: under voltage relay, 160-240V AC ph-N trip setting, 2-26V AC reset differential
OVR500: over voltage relay, 200-280V AC ph-N trip setting, 2-26V AC reset differential
CVR500: combined under/over voltage relay, UVR500 & OVR500 in a single case
UVR501: under voltage relay, 90-130V AC ph-N trip setting, 1-13V AC reset differential
OVR501: over voltage relay, 110-150V AC ph-N trip setting, 1-13V AC reset differential
CVR501: combined under/over voltage relay, UVR501 & OVR501 in a single case 

Three-phase, no neutral (3-wire) monitoring (phase failure relays):
PFR500: under voltage relay, 320-420V AC ph-ph trip setting
PFR500-R: as above plus phase rotation monitoring
PFR501: under voltage relay, 170-230V AC ph-ph trip setting
PFR501-R: as above plus phase rotation monitoring
POR500: over voltage relay, 380-480V AC ph-ph trip setting
POR501: over voltage relay, 210-270V AC ph-ph trip setting

Non-standard variants were also produced.

See also:
UFR/OFR series AC frequency relays
OLR600 series AC overload relays