A modular electromechanical switching system comprising: a plurality of modular single pole, single current carrying path switching devices (82, 82') configured to selectively switch between conducting and non-conducting states, and wherein one or more pairs of the switching devices are positioned side-by-side, and wherein one or more other pairs of the switching devices are positioned side-by-side with an interlock provided therebetween; a wiring and/or control base, each of the switching devices being pluggable into the base to receive at least control signals for controlling switching of the devices between their respective conducting and non-conducting states; control circuitry configured to provide control signals to the switching devices to cause at least one of the single-phase switching devices to open or close the single current carrying path at a time coordinated with a current zero-crossing or a predicted current zero-crossing of a phase of three-phase power in accordance with a point-on-wave, POW, switching scheme; and the one or more interlocks disposed between and mechanically coupled to the one or more other pairs of switching devices of the switching devices are configured to prevent the simultaneous closing of the respective pair of switching devices, and wherein each interlock of the one or more interlocks comprises: a housing; and a first lever arm and a second lever arm mounted pivotally within the housing, wherein each lever arm carries a respective actuating element, wherein each actuating element interfaces mechanically with a side auxiliary actuator of the switching devices, and wherein each lever arm includes an integral cam arrangement (214, 216) that contact one another to prevent one of the lever arms from moving in a downward position when the other lever arm is already in a downward position, and wherein the housing consists of two parts, wherein the housing is symmetrical about a vertical center line, and wherein the housing includes a window opening on both sides through which the actuating elements are accessible. a plurality of modular single pole, single current carrying path switching devices (82, 82') configured to selectively switch between conducting and non-conducting states, and wherein one or more pairs of the switching devices are positioned side-by-side, and wherein one or more other pairs of the switching devices are positioned side-by-side with an interlock provided therebetween; a wiring and/or control base, each of the switching devices being pluggable into the base to receive at least control signals for controlling switching of the devices between their respective conducting and non-conducting states; control circuitry configured to provide control signals to the switching devices to cause at least one of the single-phase switching devices to open or close the single current carrying path at a time coordinated with a current zero-crossing or a predicted current zero-crossing of a phase of three-phase power in accordance with a point-on-wave, POW, switching scheme; and the one or more interlocks disposed between and mechanically coupled to the one or more other pairs of switching devices of the switching devices are configured to prevent the simultaneous closing of the respective pair of switching devices, and wherein each interlock of the one or more interlocks comprises: a housing; and a first lever arm and a second lever arm mounted pivotally within the housing, wherein each lever arm carries a respective actuating element, wherein each actuating element interfaces mechanically with a side auxiliary actuator of the switching devices, and wherein each lever arm includes an integral cam arrangement (214, 216) that contact one another to prevent one of the lever arms from moving in a downward position when the other lever arm is already in a downward position, and wherein the housing consists of two parts, wherein the housing is symmetrical about a vertical center line, and wherein the housing includes a window opening on both sides through which the actuating elements are accessible. a housing; and a first lever arm and a second lever arm mounted pivotally within the housing, wherein each lever arm carries a respective actuating element, wherein each actuating element interfaces mechanically with a side auxiliary actuator of the switching devices, and wherein each lever arm includes an integral cam arrangement (214, 216) that contact one another to prevent one of the lever arms from moving in a downward position when the other lever arm is already in a downward position, and wherein the housing consists of two parts, wherein the housing is symmetrical about a vertical center line, and wherein the housing includes a window opening on both sides through which the actuating elements are accessible.