The Autonics TC4S-N4N is a compact DIN-rail temperature controller with a DIN size of W48 × H48 mm and a 4-digit 7-segment LED display for clear process readouts. It supports multiple control methods, including ON/OFF, P, PI, PD, and PID, and accepts inputs from thermocouples K (CA), J (IC), and L (IC), as well as RTDs such as DPt100 Ω and Cu50 Ω, with a sampling cycle of 100 ms. The control output is presented by a dedicated indicator, providing a quick visual status of the process. Power is supplied from 100–240 VAC at 50/60 Hz. It features a proportional band from 0.1 to 999.9 °C/°F, an integral time from 0 to 9999 seconds, a derivative time from 0 to 9999 seconds, a control period between 0.5 and 120.0 seconds, and a manual reset adjustable from 0.0 to 100.0%. Environmental operating conditions specify an ambient temperature range of -10 to 50 °C with storage from -20 to 60 °C, and ambient humidity of 35 to 85% RH with storage in the same 35 to 85% RH range. The TC4S-N4N’s combination of flexible input options, versatile control strategies, and clear indication makes it well-suited for reliable temperature control across a range of industrial applications.