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Contactors and overload relays
Contactors and overload relays are fundamental components in any motor control center or industrial automation system. These devices are designed to handle high inrush currents and provide reliable switching for three-phase motors up to several hundred kilowatts. The contactor itself is an electromechanical switch rated for continuous duty, typi...
Contactors and overload relays are fundamental components in any motor control center or industrial automation system. These devices are designed to handle high inrush currents and provide reliable switching for three-phase motors up to several hundred kilowatts. The contactor itself is an electromechanical switch rated for continuous duty, typically available in AC-3 and AC-4 utilization categories, with coil voltages ranging from 24V DC to 690V AC. Overload relays, on the other hand, protect the motor from thermal damage by monitoring current flow through a bimetal strip or electronic sensor. They offer adjustable current settings, usually expressed in amperes, and feature trip classes such as Class 10, Class 20, or Class 30 to match motor starting characteristics. Modern units also include phase loss protection and ambient temperature compensation, ensuring accurate protection even in harsh environments.
These components are predominantly installed in electrical panels, motor control centers (MCCs), and distribution boards within industrial facilities. Common sectors include manufacturing plants, water treatment facilities, HVAC systems, conveyor systems, and pumping stations. They are also found in commercial buildings for elevator controls, compressors, and refrigeration units. The combination of contactors and overload relays forms a motor starter, which is essential for safe and efficient motor operation in both star-delta and direct-on-line configurations.
Within this category, ABB offers several subcategories including the AF series contactors and the T series thermal overload relays. Key article codes include AF09, AF16, AF30, AF38, AF50, AF65, AF80, AF95, AF110, AF145, AF185, AF205, AF260, AF305, AF400, AF460, AF580, AF750, AF900, AF1100, AF1350, AF1650, AF2050, and AF2600 for contactors. For overload relays, common codes are TA25DU, TA42DU, TA75DU, TA110DU, TA200DU, TA450DU, TA600DU, TA800DU, TA1100DU, and TA2000DU. The article code structure typically follows a pattern where the prefix indicates the series (AF for contactors, TA for thermal relays) followed by the rated operational current in amperes at 400V AC-3.
Partnering with Electric Automation Network ensures you receive genuine ABB components with full traceability and manufacturer warranty. Our engineering team provides personalized technical support for selecting the correct contactor and overload relay combination based on your motor specifications, including rated current, starting method, and environmental conditions. We offer real-time pricing and express worldwide shipping, minimizing downtime for your critical operations. All products are accompanied by detailed technical documentation, including wiring diagrams and characteristic curves.
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