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Thermal relays
Thermal relays, also known as overload relays or motor protection relays, are essential electromechanical devices designed to safeguard electric motors against sustained overcurrents, phase loss, and phase imbalance. These components operate on the principle of thermal expansion, using bimetallic strips or electronic sensors to mimic the motor's...
Thermal relays, also known as overload relays or motor protection relays, are essential electromechanical devices designed to safeguard electric motors against sustained overcurrents, phase loss, and phase imbalance. These components operate on the principle of thermal expansion, using bimetallic strips or electronic sensors to mimic the motor's thermal behavior. Our range includes compact sizes S00, S0, S2, and S3, covering power ratings from 5.5 kW to 45 kW and current settings from 0.25 A to 100 A. Key technical features include adjustable current setting dials, automatic or manual reset modes, temperature compensation for ambient variations, and high long-term stability. They are typically mounted directly onto contactors via dedicated connection kits, ensuring a compact and reliable assembly for motor control centers.
These thermal relays are predominantly deployed in industrial motor control panels, conveyor systems, pumps, compressors, fans, and HVAC equipment. They are integral to distribution boards and automation cabinets where three-phase induction motors require robust protection against overload conditions. Their ability to detect phase failure and unbalance makes them critical in continuous process industries such as water treatment, manufacturing, and material handling. The devices are designed for panel mounting and can be integrated into motor starter assemblies with contactors and circuit breakers for comprehensive motor management.
Our catalog includes subcategories such as standard thermal overload relays (e.g., 3RU2 series), electronic overload relays (e.g., 3RB3 series), and accessories like mounting kits and terminal blocks. Key article codes follow the pattern 3RU2116-1AB0 for size S00, 3RU2126-1AB0 for S0, 3RU2136-1AB0 for S2, and 3RU2146-1AB0 for S3, with variations indicating current range and reset mode. These relays are available with screw or spring-loaded terminals, and optional auxiliary contact blocks for remote signaling.
Partnering with us ensures access to genuine Siemens thermal relays with real-time pricing and global express shipping. Our team of specialized electrical engineers provides personalized technical support for selection, sizing, and integration into your motor protection schemes. We offer detailed documentation including datasheets, wiring diagrams, and application notes for every article, ensuring you have the technical resources needed for a successful installation.
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