The Mastervolt CS Neutral Transformer is an IP65 transformer that provides a neutral for CS inverters.
The SunMaster CS15TL and CS20TL ‘standard’ versions have been replaced by SunMaster CS15TL RP and CS20TL RP models, which incorporate grid support functions into the inverter as required by national connection requirements such as CEI 0-21 and VDE4105. The new CS RP versions require a 3-phase 4-wire system (L1, L2, L3, N, PE), unlike the ‘standard’ SunMaster CS versions, which use a 3-phase 3-wire connection (L1, L2, L3, PE).
When updating an existing installation with the ‘standard’ CS version, a neutral wire may not be available. The neutral transformer can be used to prevent the hassle of adding a neutral cable. The neutral transformer is a small box which is installed in the 3-phase AC supply line and provides a neutral connection for the inverter.