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Old 03-10-2019, 15:59   #1
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Perkins Prima 50 Relays

I am currently replacing some of the wiring on my Perkins Prima 50, there are 3 relays mounted on the rear of the engine that I am looking to replace. I have the part numbers but can anyone help with any specs on the relays that would help in identifying an after market replacement that I can use to keep the cost down.
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Russell.
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Old 03-10-2019, 16:57   #2
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Re: Perkins Prima 50 Relays

Most relays are off the shelf items and have functional diagrams/specs scribed right on the housing. Got pics?
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Old 05-10-2019, 02:02   #3
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Re: Perkins Prima 50 Relays

Thank you for the response, The relay is mad by Lucas and only other markings are 2 sets of numbers as follows 33RA 24V 1NT, 33452B 4887 no other markings. It has 4 terminals on the base.
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Old 10-10-2019, 13:22   #4
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Re: Perkins Prima 50 Relays

You won't find them at the auto parts store. By the part number, yours are the larger Lucas 33ra relays and not the smaller 28ra relays commonly found on automobiles. They are also 24 volt. Probably 40 amp. Google and that part number will take you to a seller of originals or a cheaper replacement. If you wanted to go to the trouble, you could rewire with the cheaper and much more common 28ra 4 or 5 pin relays. These are SIMILAR to those used in automobiles to control heat and A/C and horn. You would need 24 volt versions of the relay. Which area available, but not common to automobiles.
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Old 10-10-2019, 14:50   #5
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Re: Perkins Prima 50 Relays

Lucas 33RA SRB632 24V Normally open (Intermittent) Relay. 40A Capacity. 4 Terminals.
85 & 86 are the coil connections (6.3mm blade).
30, feed in and G, load out are screw connections.
When energised terminals 30 and G are connected. (Replaces Lucas relay 33452)
https://www.autoelectricsupplies.co....ta_sheet_3.pdf
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Old 11-10-2019, 15:53   #6
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Re: Perkins Prima 50 Relays

Thank you for the responses, you have giving me the info I need.
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