Industrial 120SN50 Lamp Ballast

BBC Brown Boveri’s 120SN50 lamp ballast is an electronic ballast identified by the model number 120SN50, with the V35 designation and the adjacent 40-120 notation appearing in listings. It is described in product listings as an electronic ballast used in lighting fixtures to regulate current to the connected lamp. Electronic ballasts, by design, provide ignition and then maintain a controlled current to the lamp, which helps stabilize light output and protect lamp life. This model sits in BBC’s lineage of industrial ballast technology and is referenced in listings as part of the 120SN50/V35 family, enabling buyers to source compatible replacements for fixtures specified to accept that configuration. The accompanying designation 40-120 in listings suggests a range commonly associated with this ballast configuration.