Techna panel mounting circuit breakers techna tr11c80 panel mount circuit breaker thermal over current 240vac voltage rating 8a current rating 1 pole 1ka interrupting capacity pushbutton reset quick connect tabs terminal central nut mount 94 x 102mm panel 15kv dielectric strength 100m insulation resistance 20degc to 60degc standards iec ul csa vde 19mm long 42mm high 10g weight techna tr11 series panel mounting thermally operated circuit breakers single pole pu