Control Relay
In industrial environments, continuous monitoring of electrical parameters is a major challenge to guarantee…
What are control relays used for in industrial environments?
Industrial control relays provide a critical function in protecting installations and monitoring industrial equipment. These devices intervene to:
- Detect AC/DC voltage variations likely to damage industrial machinery
- Control temperature in installations via integrated thermal probes
- Monitor high and low liquid levels in tanks to prevent liquid leaks
They effectively protect electric motors, fans, pumps, and HVAC control systems against overloads and malfunctions. The mechanical actuator coupled with the coil's magnetic field ensures a fast and precise response. Industrial relays with LED indicators facilitate instant diagnostics, optimize maximum equipment lifespan, and enable secure remote commands. Proper installation of these relay varieties ensures overload protection and reduces unexpected production shutdowns.
The different varieties of control relays available
Control relay systems come in several technological families adapted to the specific needs of industrial applications.
Schneider Electric's Zelio Control RM35 and RM22 coil-based electromechanical relays ensure reliable switching on high-power loads, with AC/DC voltage monitoring from 15 V to 600 V.
Pre-mounted miniature relays facilitate integration in compact enclosures.
Multifunction control relays simultaneously monitor multiple parameters: overcurrent, undercurrent, phase sequence, asymmetry, and neutral faults on three-phase networks from 208 V to 480 V.
Switching devices for frequency control verify electrical network stability between 40 Hz and 70 Hz. The Harmony RM35-T range notably integrates combined voltage and motor temperature monitoring, ideal for protecting critical industrial machinery.
EMC signaling modules and time-delay relay supports complete the offer for advanced automation applications.
Selection criteria and technical characteristics
To select the appropriate control relay, several technical criteria must be evaluated based on your low-power control circuit and the high-power electrical load to be protected.
- AC/DC supply voltage is the first parameter, with compatible models ranging from 24 V to 240 V for flexible integration.
- The number of output contacts determines the capacity to manage multiple switching devices simultaneously.
- The modular format with DIN rail mounting facilitates installation in industrial enclosures, while screw and push-in terminals allow quick and reliable circuit connection.
Industrial relays with LED indicators provide instant visualization of operating status. Certifications and compliance with industrial standards guarantee maximum lifespan in demanding environments. The choice between electromechanical relays and solid-state relays depends on switching frequency constraints and the operating environment.
Find on One-Elec our complete catalog of Schneider Electric industrial control relays, with a wide selection of relay systems available in stock for fast delivery within 24/48h in mainland France. Our complete range of mounting accessories, EMC signaling modules, and time-delay relay supports guarantees you a turnkey solution for all your automation and installation protection projects. Our teams are at your disposal to support you in selecting the control equipment best suited to your technical constraints and industrial applications.