Reliance Electric 45C40 USNT Industrial Control Relay

Reliance Electric 45C40 USNT is a two‑channel input module for Reliance AutoMax/AutoMate digital I/O rails used in DCS‑5000 and related industrial control configurations. It accepts 120 VAC field signals and feeds corresponding digital inputs to the controller, enabling reliable reads from sensors, pushbuttons, and limit switches wired to the control panel. The module is designed for DIN‑rail mounting and is compatible with the AutoMax family, often paired with other input/output modules such as 45C43 and 45C44 to expand input capacity for more complex machinery. Electrically, it is specified for 120 V input operation, with low standby current and modest per‑channel power draw, and it accommodates long field wiring runs up to 1000 ft. In practical terms, the 45C40 provides a rugged, straightforward means to interface external 120 VAC devices with Reliance Electric automation systems, delivering clean digital inputs to the AutoMax controller for reliable sequence control and interlocks.