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Discontinued AC frequency trip relays, adjustable 40 - 70 Hz, with a 12/24VDC auxillary power supply in an 11-pin plug-in case. Standard models were:
UST100 Under speed trip relay, 110 VAC input
UST101 Under speed trip relay, 230 VAC input
OST100 Over speed trip relay, 110 VAC input
OST101 Over speed trip relay, 230 VAC input
Sales Bulletin (M040101; revision date - 09/1998)
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