4‑channel relay I/O module for 3500 machinery monitoring rack, 4 independent Form‑C SPDT relay outputs, contact rating 5A@250VAC /30VDC, programmable AND/OR alarm voting logic, powered by rack back‑plane bus, hot‑swap slot installation, OK / TX‑RX / channel alarm LED indicators, green plug‑in terminal blocks, dimension 241×24.4×99.1 mm, operating temp‑30℃~+65℃, humidity 5‑95% non‑condensing, comply with API‑670, CE certified
