Hazardous Location Relay Module Powers Actuators in Hazardous Locations
Via internal system voltage, Wago Corp.’s new two-channel relay output module directly activates intrinsically safe circuits, powering actuators in hazardous locations. Unlike traditional solid-state hazardous location relays, the 750-538 carries two changeover contacts for activating zone 0/20 and 1/21 devices, such as relays, solenoid valves, contactors and optical/acoustic signal generators. This supports diverse hazardous location applications in oil/gas processing, wastewater treatment, brewing/distillation and more.
The electro-mechanical 750-538’s switching voltage/current is rated 125 VAC/0.5 A and 30 VDC/1 A. The maximum permissible limits depend on the actuator's location per EN 60079-11. The 750-538’s normal open contacts are electrically isolated. On-board LEDs indicate relay switching status. To ensure connection reliability within operating temperatures of 0°C to +60°C, 750-538 employs Cage Clamp spring pressure technology.
The 750-538 joins Wago’s growing EX i portfolio of nearly 20 intrinsically safe modules and power supplies. All EX i devices are compatible with Wago-I/O-System buscouplers, PLCs and IPCs.
The Wago-I/O-System was designed for non-hazardous areas or in Zone 2/22. It integrates Zone 0/22 and 1/21-based sensors and actuators via intrinsically safe Ex i modules without additional devices (e.g., Zener barriers). This safely brings standard fieldbus technology to Ex i applications, befitting process (grain/coal mills, bio-gas/cement plants) and energy industries (petroleum production).