ABB 2TLA050005R1140 MKEY6 NPT 2NC, current lifecycle

The 2TLA050005R1140: The 2NC contact configuration means two normally-closed safety channels are wired in series — standard practice for a dual-channel safety circuit that monitors guard position and detects a fault if one channel welds. The NPT thread indicates a North American pipe-thread conduit entry, so the switch body mates directly to NPT fittings without adapters.