A switching apparatus allows coupled coils to be dynamically switched in or out of a circuit using small control currents. The apparatus includes at least one latching circuit, one or more control circuits and diodes. The latching circuit may have two bipolar transistors connected in a transistor latch configuration with at least two diodes, such that at least one diode may be connected in series with a base of the each bipolar transistor. The control circuits may be connected to the latch circuit for operating the bipolar transistors. The diodes may be connected in the circuit for protecting the latching and control circuits from being exposed to high voltages and currents during the turn-off or turn-on of the inductor coils. This allows overall efficiency levels to be maintained while changing the inductance of the circuit as per requirements. The circuits may be used in switch mode power supplies (SMPS).