Bulletin 1321 Line/Load Reactors

The Allen-Bradley Bulletin 1321 family encompasses isolation transformers and line/load reactors designed to protect variable-frequency drives and other industrial equipment from voltage transients, line disturbances, and harmonic-related stress. With 187 products in this family, the Bulletin 1321 line covers a wide range of kVA ratings and voltage configurations — from compact 7 kVA units such as the 1321-3TW007-BB up to large 880 kVA transformers like the 1321-3TH880-BC, making them suitable for everything from small machine-level drives to heavy industrial power distribution. Within the catalog-number structure, the characters following the bulletin prefix encode the winding type (TW = wound, TH = high-capacity), the kVA rating (e.g., 051 = 51 kVA, 440 = 440 kVA), and a two-character suffix indicating primary and secondary voltage classes (e.g., BB = 460V primary / 460V secondary, BA = 460V primary / 230V secondary, CB = 575V primary / 460V secondary). Popular mid-range options include the 1321-3TW051-CB (51 kVA, 575V-to-460V step-down) and the 1321-3TH275-BB (275 kVA, 460V-to-460V isolation). Consult the Bulletin 1321 Technical Data Sheet for complete selection tables and application guidelines.