No products
Product successfully added to your shopping cart
Viewed products
-
114X4413 DANFOSS...
OP-MPUC125MLP00E CONDENS. UNIT
-
027H1062 DANFOSS...
ICS3E 25-15 20 DIN
-
1SFA899001R1250 ABB...
PSCT-250 CURRENT TRANSFORMER
-
119M/30 119M30...
UTIL PRESSION ergonomic 30 mm GRAFOPLAST
-
52010410 LAPP...
SKINDICHT EV PG 42 incised seal ring
-
080Z4006 DANFOSS...
System manager
Thermal overload relay
Thermal overload relays are essential protective devices designed to safeguard electric motors and associated circuits from damage caused by prolonged overcurrent conditions, such as overloads or phase failures. These relays operate based on the thermal expansion of bimetallic strips, which bend when heated by the motor current, activating a tri...
Thermal overload relays are essential protective devices designed to safeguard electric motors and associated circuits from damage caused by prolonged overcurrent conditions, such as overloads or phase failures. These relays operate based on the thermal expansion of bimetallic strips, which bend when heated by the motor current, activating a trip mechanism that disconnects the motor from the supply. Key technical parameters include the current setting range (e.g., 0.1 to 630 A), trip class (e.g., Class 10, 20, or 30), and the number of poles (typically 3P for three-phase motors). They are often used in conjunction with contactors and circuit breakers in motor control centers (MCCs) and can include features like ambient temperature compensation, manual or automatic reset, and auxiliary contacts for signaling. In various regions, these devices are also known as motor protection relays, overload heaters, or thermal overload switches.
Thermal overload relays are primarily deployed in industrial environments where electric motors drive machinery, such as in manufacturing plants, pumping stations, conveyor systems, and HVAC installations. They are installed in motor starter assemblies within distribution panels, control cabinets, and automation systems to ensure continuous and safe operation. Common sectors include water treatment, mining, food processing, and automotive manufacturing, where motor reliability is critical to production uptime.
Within our catalog, thermal overload relays are organized into subcategories based on current range and compatibility with specific contactor series. Key article codes include the LR2 series (e.g., LR2-D13, LR2-D33) and the TA series (e.g., TA25, TA42, TA75), which are designed for direct mounting on contactors like the LC1 or DIL series. The code structure typically follows a pattern: prefix (e.g., LR2 or TA) followed by a numeric designation indicating current range and features. For example, LR2-D13 covers a setting range of 0.1-0.16 A, while TA75 covers 48-65 A.
Our thermal overload relays come with comprehensive technical documentation, including datasheets and wiring diagrams, to facilitate selection and installation. We offer express worldwide shipping and personalized support from our team of electrical engineers, who can assist with sizing, coordination studies, and troubleshooting to ensure optimal motor protection.
All ratings we receive from the items we offer are real and verified. A small gesture, but a lot of value. That's why we thank you for that minute you invest in leaving us your opinion and qualification about the products, because it helps us to continue improving and to offer you a service of even higher quality.