4‑channel SPDT relay control module for 3500 machinery monitoring rack, powered by rack back‑plane bus, typical power consumption 5.8W, 4 independent programmable relay outputs, support voting & AND/OR alarm logic, relay contact rating 5A@24VDC / 240VAC, epoxy sealed relay unit, OK / TX‑RX status LED indicators, full‑height rack slot installation, hot‑swap capable, dimension 241×24.4×242 mm, operating temp‑30℃~+65℃, API‑670 & CE certified, configure via 3500 rack software
