Wago test plug adaptor 1 pole for 255 257 series pcb terminal blocks 249 series wago 249 110 wago 249 110 test plug adaptor 1 pole for 255 256 257 series pcb terminal blocks pin spacing 5mm 0197 in grey wago 249 110 test plug adaptor 1 pole 255 256 257 pcb terminal blocks grey 100pk