ABB 9T51B5817

The ABB 9T51B5817 buck-boost transformer is a compact, single-phase dry-type unit designed primarily for insulating and isolating applications. It features dual voltage primaries and secondaries, allowing flexible connections to accommodate various voltage setups. Typically, this kind of transformer is used to slightly adjust the supply voltage—either stepping it up or down by about 5 to 27%. When wired as an autotransformer, it meets the requirements outlined in NEC Article 210-9, Exception 1. Distributed by BSP Automation, this transformer is a reliable choice for fine-tuning voltage levels in industrial settings. In the field, it’s often referred to as the QB AUTO 575-402.5-172.5 2.2KVA—making it the go-to gear for voltage tweaking without a hassle.