A transformer for low-voltage applications such as landscape lighting, comprising a primary winding and a secondary winding inductively coupled to the primary winding, the primary winding adapted to be energized with a high voltage and the secondary winding adapted to carry a proportionately lower voltage, the secondary winding including a plurality of output taps, each output tap corresponding to a specified output voltage, and at least one common tap for each 300 W of output power up to the full capacity of the transformer, the secondary winding further including an additional common tap for an additional 300 W of output power beyond the full capacity of the transformer. A circuit breaker is associated with the primary winding and a circuit breaker is associated with each common tap and the additional common tap.