ABB RXHL411 1MRK001894‑AA Relay Module

The ABB RXHL411 1MRK001894‑AA Relay Module is designed to interface digital control signals with industrial relays. It accepts eight isolated 24 V DC inputs that draw under 5 mA each. When an input is active, a corresponding output relay closes, switching loads up to 5 A at 250 V AC or 30 V DC. The relays are form A (SPST) type with silver alloy contacts for long life in industrial environments. The module’s compact housing measures 100 × 80 × 25 mm and weighs just 180 g. It mounts easily on a standard DIN rail or in a panel cutout. All connections use screw‑clamp terminals that lock wiring in place, preventing loose connections under vibration.

This relay module runs on a 24 V DC supply with typical consumption of 2 W. Four green LEDs on the front panel indicate input status, and four yellow LEDs show relay output activation. A red LED flashes if an internal fault such as coil burnout or contact weld is detected. For advanced users, an optional RS‑485 port provides remote diagnostics and status polling. The onboard microcontroller performs self‑tests every 200 ms to ensure reliable operation. If a fault occurs, the module disables the affected channel and flags the error LED. Test points on the PCB allow technicians to measure input voltage and relay coil current without removing the unit. The module’s conformal coating and IP20 rating protect against dust and minor spills.

Industrial reports highlight a growing need for simple relay interface modules with built‑in diagnostics as factories adopt predictive maintenance. A 2025 automation industry survey shows that using modules with status LEDs and remote monitoring cuts troubleshooting time by up to 30 percent. The RXHL411 meets this need by combining basic relay switching with fast fault detection and clear visual indicators. Its compact size saves space in crowded control cabinets. Zhangzhou Fengyun Electric Equipment Co., Ltd. is a leading supplier of ABB and other top automation brands. The company stocks a full range of PLC and DCS modules, I/O cards, drives, sensors, and control boards. With strong import/export channels and a skilled technical team, Fengyun Electric ensures fast delivery and expert after‑sales service. For more details visit their official site or explore the product page.

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