Lifecycle and sourcing reality
The NX-SIH400 is discontinued. No official successor is listed in the available evidence. Sourcing is limited to surplus or broker channels — submit an RFQ for current availability and pricing.
Functional safety and I/O
Rated Safety Category 4, PLe, SIL3 — suitable for the highest risk reduction requirements in machine safety circuits. Provides 4 digital inputs, spring terminal termination, and a Test Output feature for diagnostic coverage.
Mounting and approvals
DIN Rail mount, spring terminal connections. Approved by CE, C-Tick, cULus, KC, TUV, UL. Operating temperature 0°C to 55°C.