A solid-state alternating current, AC, power switch circuit for connection between an AC input and an AC load, the solid-state AC power switch circuit comprising: a first solid-state switch connected to block a first half-cycle of the AC input when OFF; a second solid-state switch connected in series with the first solid state switch to block a second half-cycle of the AC input when OFF; and a controller comprising: a detection means comprising a zero-cross detector circuit arranged to monitor the AC input to determine zero-crossings of the monitored AC input at which the AC input equals zero; and a controller means arranged to generate control signals in response to determined zero-crossings of the monitored AC input, the control signals being configured to turn ON the first solid-state switch and the second solid-state switch according to a turn-on sequence in which the first solid state switch is turned ON first during a first detected zero-crossing in which the voltage of the monitored AC input is zero and the second solid state switch is turned ON subsequently during a second detected zero-crossing in which the voltage of the monitored AC input is zero, so as to provide the AC source to the AC load; characterised in that the solid-state AC power switch circuit further comprises a first bias resistor connected in parallel with the first solid-state switch; and a second bias resistor connected in parallel with the second solid-state switch. a first solid-state switch connected to block a first half-cycle of the AC input when OFF; a second solid-state switch connected in series with the first solid state switch to block a second half-cycle of the AC input when OFF; and a controller comprising: a detection means comprising a zero-cross detector circuit arranged to monitor the AC input to determine zero-crossings of the monitored AC input at which the AC input equals zero; and a controller means arranged to generate control signals in response to determined zero-crossings of the monitored AC input, the control signals being configured to turn ON the first solid-state switch and the second solid-state switch according to a turn-on sequence in which the first solid state switch is turned ON first during a first detected zero-crossing in which the voltage of the monitored AC input is zero and the second solid state switch is turned ON subsequently during a second detected zero-crossing in which the voltage of the monitored AC input is zero, so as to provide the AC source to the AC load; a detection means comprising a zero-cross detector circuit arranged to monitor the AC input to determine zero-crossings of the monitored AC input at which the AC input equals zero; and a controller means arranged to generate control signals in response to determined zero-crossings of the monitored AC input, the control signals being configured to turn ON the first solid-state switch and the second solid-state switch according to a turn-on sequence in which the first solid state switch is turned ON first during a first detected zero-crossing in which the voltage of the monitored AC input is zero and the second solid state switch is turned ON subsequently during a second detected zero-crossing in which the voltage of the monitored AC input is zero, so as to provide the AC source to the AC load; characterised in that the solid-state AC power switch circuit further comprises a first bias resistor connected in parallel with the first solid-state switch; and a second bias resistor connected in parallel with the second solid-state switch.