supply of relay point contactor.relay point contactor., supply of relay point contactor unit, non-ac immune, plug in type, 24v dc and capable of controlling electric point machine operating on 110 v dc conforming to irs:s-46, irs:s-34 & irs:s-23. the unit shall consist of n / r relay ( double wound dc neutral line relay ) , xr relay ( dc neutral relay ) . w ( n ) r / w ( r ) / r mechanically interlocked relay & wcr ( heavy duty contractor relay with 16 ampere breaking capacity ) . all the above relays shall be mounted on pre-wired base plate. [ warranty period: 30 months after the date of delivery ]