Schneider Electric RHN-421B Industrial Control Relay

The Schneider Electric Telemecanique RHN421B is an industrial plug‑in control relay with a 24 V AC, 50 Hz coil and a 1 A contact rating, designed for reliable switching in low‑level control and automation circuits. It features four changeover contacts (4C/O, 4PDT) and uses a plug‑in socket mount with plug‑in connections, making it suitable for installation in industrial control panels, OEM machinery, instrumentation equipment, and process automation where electrical isolation is essential. As part of the Harmony RHN series, the RHN421B is a common OEM direct replacement, with cross‑reference options including Schneider Electric RXM4AB1B7 and Telemecanique RHN421B.