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Electronic overload relay
Electronic overload relays are solid-state protection devices designed to safeguard motors and electrical circuits against prolonged overcurrent conditions caused by overloads, phase loss, or phase imbalance. Unlike traditional thermal bimetallic relays, these units use current transformers and microprocessor-based electronics to provide precise...
Electronic overload relays are solid-state protection devices designed to safeguard motors and electrical circuits against prolonged overcurrent conditions caused by overloads, phase loss, or phase imbalance. Unlike traditional thermal bimetallic relays, these units use current transformers and microprocessor-based electronics to provide precise, adjustable tripping curves (Class 5, 10, 20, or 30) and high repeatability. They typically feature a wide setting range for the full-load current (FLC), manual or automatic reset modes, and integrated test and stop functions. Many models include a trip class selector, ambient temperature compensation, and communication capabilities via Modbus RTU or PROFIBUS for integration into industrial automation networks. The rated operational current (Ie) can vary from 0.1 A up to 630 A depending on the model, with rated insulation voltage (Ui) up to 690 V AC. These relays are available in standalone units or as add-on modules for contactors, with screw or spring-cage terminals for secure wiring.
Electronic overload relays are deployed in motor control centers (MCCs), distribution panels, and automated production lines across industries such as manufacturing, water treatment, HVAC, mining, and oil and gas. They are ideal for applications requiring high switching frequencies, frequent starts, or harsh environments where thermal drift could affect accuracy. Common installations include conveyor systems, pumps, compressors, fans, and machine tools. Their compact design allows mounting directly on contactors or on DIN rails within control cabinets, ensuring efficient space utilization and simplified wiring.
Key subcategories include standalone electronic overload relays and those designed for direct mounting on specific contactor series. Main article codes often follow a pattern like "3RB" for Siemens Sirius series (e.g., 3RB20, 3RB21, 3RB30) or "LRD" for TeSys models from Schneider Electric (e.g., LRD07, LRD12, LRD22). For ABB, codes such as "EF" or "EP" (e.g., EF19, EP205) are common, while Eaton uses "ZB" or "ZE" prefixes (e.g., ZB12, ZE100). These codes typically include digits indicating the current range and trip class, such as "3RB2066-1NC1" where the first digits denote the frame size and current setting.
At Electric Automation Network, we provide a comprehensive range of electronic overload relays from leading global brands, all with real-time pricing and availability. Our engineering team offers personalized technical support to help you select the correct relay based on motor full-load current, trip class, and communication requirements. We ensure express worldwide shipping, so your critical components arrive on time for your project deadlines.
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