A power pole transformer is a small distribution transformer mounted on utility poles that steps medium voltage down to low voltage for homes and businesses. Medium voltage from overhead lines feeds its primary winding. The transformer’s core and windings convert this to lower voltage on the secondary, typically arranged in single phase or split phase for residential service. The tank is oil filled for insulation and cooling, and bushings connect primary and secondary conductors. Protective devices such as fuses and lightning arresters are installed nearby to protect against faults and surges.