Safety switch for positive-break guarding
The ABB 2TLA050005R1430 is an MKEY6-series safety switch with 2NC contacts and an NPT conduit entry, designed for positive-break isolation on machine guarding circuits.
What the 2NC contact arrangement means for your safety circuit
Two normally-closed contacts wired in series provide a dual-channel safety input to the safety relay or PLC. This arrangement meets the redundancy requirement for PL d / SIL 2 applications per ISO 13849-1 when the switch is used as part of a properly designed safety function. The NPT conduit entry allows direct connection to rigid or flexible metal conduit in North American installations, eliminating the need for an adapter.