please I need the datasheet/installation manual for the Reyrolle type C21 (Duo-bias) Electromechanical differential relay. I need to identify the terminal M1, M2, L and the R1...R8 terminals. which is for the primary CT, secondary CT, Neutral, trip terminal and alarm?
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Reyrolle type C21 (Duo-bias) Electromechanical relays
- Thread starter Mhobi
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I don't have it, but you could try your local Siemens agent. Siemens bought Reyrolle's relay group out a few years ago.
I think the C21 is called a "mono-bias" relay, then they come out wth the 2C21 and 4C21 which were "duo-bias" versions, so might be worth knowing exactly which one you need.
Siemens Reyrolle still use the Dueo-bias brand name on their modern diff relays.
I think the C21 is called a "mono-bias" relay, then they come out wth the 2C21 and 4C21 which were "duo-bias" versions, so might be worth knowing exactly which one you need.
Siemens Reyrolle still use the Dueo-bias brand name on their modern diff relays.
- Thread starter
- #3
Actually the differential relay is the three number electromechanical(one for each phase) reyrolle type C21 with duobias written on it. I have searched the Siemens site but could only see the recent digital duobias-M relay and not the electromechanical type.
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