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Contactors & Thermal Overload Relays
Contactors and thermal overload relays are electromechanical switching devices designed for remote control and protection of electrical loads in industrial and commercial power systems. Contactors, available in configurations from 3P to 4P, handle nominal currents ranging from 9A to over 1250A, with coil voltages for AC and DC control circuits. ...
Contactors and thermal overload relays are electromechanical switching devices designed for remote control and protection of electrical loads in industrial and commercial power systems. Contactors, available in configurations from 3P to 4P, handle nominal currents ranging from 9A to over 1250A, with coil voltages for AC and DC control circuits. Thermal overload relays provide motor protection against prolonged overcurrents, featuring adjustable trip classes (Class 10, 20, or 30) and ambient temperature compensation. These components are essential for motor starters, lighting control, and power distribution, ensuring reliable switching and thermal protection in automation networks.
These devices are deployed in motor control centers (MCCs), distribution panels, and automated production lines across sectors like manufacturing, HVAC, water treatment, and material handling. Contactors manage high inrush currents of inductive loads, while thermal overload relays safeguard motors from overheating due to mechanical overload or phase loss. They integrate with PLCs and SCADA systems for remote monitoring and control, supporting DIN rail or panel mounting in enclosures with IP20 to IP65 ratings.
Key subcategories include AC contactors (e.g., 3RT20 series from Siemens, LC1D from Schneider Electric), DC contactors, and thermal overload relays (e.g., 3RU2 series, LR2 series). Article codes typically follow patterns like manufacturer prefix + current rating + coil voltage (e.g., LC1D09M7 for 9A, 220VAC coil). Main articles cover frame sizes from 9A to 630A, with accessories like auxiliary contact blocks and surge suppressors.
Electric Automation Network offers express worldwide shipping and personalized technical support from specialized engineers. We provide real-time pricing, detailed technical documentation per article, and multilingual assistance to ensure optimal selection and integration of contactors and thermal overload relays for your automation projects.
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