The RA4 relay was manufactured by Fujitsu, a relay which became a popular version of the classic telecomms. DS4E type small signal relays. This relay has not been manufactured for many years. it is obsolete and very difficult to source.
The original datasheet for the Fujitsu RA4 relay is available to be downloaded below.
Originally manufactured in coil voltages ranging from 1.5V to 48V dc, the most popular coil voltages used at the time in the telecomms and control industries were 5V, 12V and 24V
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