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Thermal overload protection symbol. The degree of protection that an internal protection device provides is classified in the iec 60034 11 standard. In a wiring diagram the symbol for overload contacts may look like two opposed question marks or an s. In this video we would learn. Different types of thermal protection exist and are identified by a tp code tpxxx which indicates.
Due to such symmetrical distribution when three phase power supply. Subscribe to our channel. Fuses and electrical protection symbols. Tp is the abbreviation for thermal protection.
The type of thermal overload for which the thermal protection is designed 1 digit. What is a thermal overload relay. Though there are different types of overload relays the most common type is the bimetallic thermal overload relay. Fuses are devices containing a small piece of special wire that melts when the intensity of the current flowing through it for a certain period of time exceeds a set value thus protecting the rest of the electrical circuit overloads.
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