ABB 1SNA645505R0100 Interface Relay

ABB 1SNA645505R0100 is a boxed interface relay from the RBR121G family designed to bridge low‑voltage control logic and higher‑voltage loads in DIN‑rail panels. It provides a single Form C (SPDT) contact set (R600 1c/o) suitable for signaling and light‑to‑moderate load switching, with load ratings from 5 to 250 V AC and a current range of 10 mA to 6 A. The coil is 24 V and accepts either 24 VAC or DC (A1–A2), aligning with ABB’s 24VUC coil designation. The module is intended for DIN‑rail mounting and is packaged in an IP20/NEMA 1 enclosure for panel use in automation environments. The 1SNA645505R0100 part number corresponds to the ABB order code for the RBR121G‑24VUC interface relay, which ABB lists among its interface‑relay offerings designed to couple control circuits with power circuits while providing electrical isolation. Typical applications include PLC or digital‑output signaling to relays, contactors, or indicator devices in machine control, industrial automation, and building management systems where compact form factor and reliable Form C switching are needed.