Electrical switch apparatus comprising: at least one lighting arrangement and main apparatus body having at least three connection elements (211, 212, 213, 214), two adjoining connection elements (211, 212, 213, 214) of said connection elements (211, 212, 213, 214) forming a socket, said lighting arrangement comprising at least a signaling means and at least two connectors (131, 132), namely a first connector and a second connector, said first connector and said second connector forming a plug. wherein said plug is connected to said socket to electrically connect said adjoining connection elements (211, 212, 213, 214) forming said socket to said connectors (131, 132) forming said plug, and wherein said lighting arrangement is configured to enable said signaling means to perform a first function when said socket is formed by a first couple of adjoining connection elements (211, 212, 213, 214) and a second function when said socket is formed by a second couple of adjoining connection elements (211, 212, 213, 214) which is distinct from said first couple of adjoining connection elements (211, 212, 213, 214), wherein the lighting arrangement further comprises at least two projections (141, 142, 143, 144), namely a first projection accommodating at least partially said first connector and a second projection accommodating at least partially said second connector, wherein said main apparatus body further comprises at least three recesses (221, 222, 223, 224) in each of which one of said at least three connection elements (211, 212, 213, 214) is arranged, and characterized in that said projections (141, 142, 143, 144) are each inserted in one of said recesses (221, 222, 223, 224) in which said two adjoining connection elements (211, 212, 213, 214) forming said socket are arranged to further mechanically connect said lighting arrangement to said main apparatus body, wherein said main apparatus body comprises at least one latching arrangement (231, 232, 233, 234), each of said latching arrangements (231, 232, 233, 234) being disposed in one of said recesses (221, 222, 223, 224), wherein at least one of said projections (141, 142, 143, 144) comprises a latching means (151, 152, 153, 154) engaged with one of said latching arrangements (231, 232, 233, 234). at least one lighting arrangement and main apparatus body having at least three connection elements (211, 212, 213, 214), two adjoining connection elements (211, 212, 213, 214) of said connection elements (211, 212, 213, 214) forming a socket, said lighting arrangement comprising at least a signaling means and at least two connectors (131, 132), namely a first connector and a second connector, said first connector and said second connector forming a plug. wherein said plug is connected to said socket to electrically connect said adjoining connection elements (211, 212, 213, 214) forming said socket to said connectors (131, 132) forming said plug, and wherein said lighting arrangement is configured to enable said signaling means to perform a first function when said socket is formed by a first couple of adjoining connection elements (211, 212, 213, 214) and a second function when said socket is formed by a second couple of adjoining connection elements (211, 212, 213, 214) which is distinct from said first couple of adjoining connection elements (211, 212, 213, 214), wherein the lighting arrangement further comprises at least two projections (141, 142, 143, 144), namely a first projection accommodating at least partially said first connector and a second projection accommodating at least partially said second connector, wherein said main apparatus body further comprises at least three recesses (221, 222, 223, 224) in each of which one of said at least three connection elements (211, 212, 213, 214) is arranged, and characterized in that said projections (141, 142, 143, 144) are each inserted in one of said recesses (221, 222, 223, 224) in which said two adjoining connection elements (211, 212, 213, 214) forming said socket are arranged to further mechanically connect said lighting arrangement to said main apparatus body, wherein said main apparatus body comprises at least one latching arrangement (231, 232, 233, 234), each of said latching arrangements (231, 232, 233, 234) being disposed in one of said recesses (221, 222, 223, 224), wherein at least one of said projections (141, 142, 143, 144) comprises a latching means (151, 152, 153, 154) engaged with one of said latching arrangements (231, 232, 233, 234).