procurement of s and t spare required for s and t system installed at sstpp, mppgcl, dongalia, khandwa ( m.p. ) procurement of s and t spare required for s and t system installed at sstpp, mppgcl, dongalia, khandwa ( m.p. ) , led signal lighting unit for shunt signal. specification as per rdso / spn / 153 / 2011 ( rev 4.1 or latest ) white aspect. , led based signal for main aspect signal with current regulator. specification as per rdso spec no rdso / spn / 153 / 2011 ( rev 4.1 or latest ) shall be suitable as per drg no sa-23002 & as 23024 / m with latest amendment for red aspect. , relay, point contactor unit, non ac immune, plug in type , 24v dc and capable of controlling electronic point machine operating on 110 v dc. specification conforming to irs:s 46, irs:s 34 & irs: s23 ( as applicable ) . 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 contactor relay with 16 ampere breaking capacity ) .all the above relays shall be mounted on pre wired base plate. , electronic magneto telephone desk. specification as per rdso spec no irs:tc 79-2020 version: 1.0-d0