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OT
In the realm of industrial automation and electrical distribution, the term "OT" refers to a category of high-performance modular control and protection devices, often encompassing overload relays, thermal protection units, and motor starters. These components are engineered to safeguard motors and electrical circuits against overcurrent, phase ...
In the realm of industrial automation and electrical distribution, the term "OT" refers to a category of high-performance modular control and protection devices, often encompassing overload relays, thermal protection units, and motor starters. These components are engineered to safeguard motors and electrical circuits against overcurrent, phase failure, and thermal stress, typically featuring adjustable current settings, trip classes (e.g., Class 10 or Class 20), and auxiliary contact integration. In different global markets, these may be known as thermal overload relays, motor protection relays, or simply overloads, all designed for DIN-rail mounting in control panels. Key technical parameters include rated operational current (Ie) from 0.1 A to 630 A, rated insulation voltage (Ui) up to 690 V, and compatibility with contactors for coordinated motor starting.
These devices are primarily deployed in motor control centers (MCCs), distribution boards, and automation cabinets across sectors like manufacturing, water treatment, HVAC, and material handling. They ensure reliable protection in environments requiring frequent start-stop cycles, such as conveyor systems, pumps, compressors, and fans. The OT category is integral to IEC and UL standard installations, providing both manual and automatic reset options, and often includes test buttons and trip indicators for easy diagnostics.
Within this category, key subcategories include thermal overload relays (e.g., series like 3RU, LR2, or KTA), electronic motor protection relays (e.g., 3RB or EMR series), and motor starters with integrated protection. Common article codes follow patterns like "OT-XXX-YYY" where XXX denotes current range and YYY indicates trip class or auxiliary contact configuration. For instance, the 3RU2116-1AB0 is a typical thermal overload relay for 0.1-0.4 A, while the LR2-D1310 covers 0.1-10 A. These codes often include suffixes for screw or spring-clamp terminals.
Partnering with Electric Automation Network ensures access to genuine OT devices at competitive prices, with up to 65% discount compared to list prices. Our engineers provide tailored technical support for selecting the correct trip curve and current setting, and we offer express worldwide shipping from stock. Each product includes detailed documentation, including datasheets and wiring diagrams, to streamline integration into your automation projects.
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