The 5001235 is a 12-pole Terminal Block barrier strip type standard base, 500 series terminal blocks are available in brass and tinned inserts with M3-steel, zinc-plated and chromed screw. Two variations of wire protectors are offered, type HDS have standard protectors and type MDS have barrier protectors. Versions without wire protectors are also offered with barriers in inserts (type SL). Captive screws are fitted as standard.