The 1020180000 is an one circuit feed-through Terminal Block with screw connection, for plug-in cross-connector for screwable cross connection and 4mm² wire cross section area. M2.5 clamping screw and 10mm stripping length. Blue colour, TS 35 rail mount and snap-on mounting. The WDU 4 BL 800V terminal block accepts 26AWG minimum to 10AWG maximum wire size. Hardened steel for mechanical strength and high-quality tinned copper for optimum conductivity. All materials have been tested to current environment guidelines. The W-Series offers solutions for all standard electrical functions. It brings considerable time savings compared to all other screw terminals on the market. Thanks to the patented design of Weidmüller's W-series screw connection technology it is possible for two conductors with the same cross-section to be connected in one and the same clamping yoke without difficulty.