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UFR500 / UFR501 / OFR500 / OFR501 AC Frequency Relays

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Product Archive Notice

This page refers to older or legacy products that may be discontinued.

The sales and technical literature on this page are made available for download as a service to our customers. Archived documentation may contain telephone numbers and/or addresses that are no longer valid. Please refer to our Contact Us page for up-to-date contact information. Terms and conditions of sale stated in these documents, including warranty coverage, are subject to change.

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The UFR and OFR series are a discontinued range of AC frequency trip relays for generator monitoring & protection. No direct Murphy equivalent. Standard models were:

UFR500
AC under frequency relays, 40-55Hz or 50-65Hz, in 110VAC or 230VAC variants.

UFR501
Similar to UFR500 but with 48 - 51 Hz or 325 - 400 Hz adjustment ranges.

OFR500
AC over frequency relays, 50-65Hz, in 110VAC or 240VAC variants.

OFR501
Similar to OFR500 but with 49 - 52 Hz or 400 - 475 Hz adjustment ranges.

Sales Bulletin (ms5734)

 

See also:
UVR/OVR/CVR/PFR/POR series AC voltage relays
OLR600 series AC overload relays

Note: These attachments may also be linked in the above article.

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