Electronic Thermal Overload Relay Symbol

The relay are switching devices activated by signals.

Electronic thermal overload relay symbol.

Thermal olr is based on the principle of deformation of a bimetallic strip on heating and the electronic overload relay is a microprocessor based device. In a wiring diagram the symbol for overload contacts may look like two opposed question marks or an s. Overload relay connection diagram. Although there are several types of overload relays available in the market however the most frequent type of relay is the.

Most of the time a small voltage or current is used to switch other voltages or higher currents that may be electromechanical or fully electronic type. Though there are different types of overload relays the most common type is the bimetallic thermal overload relay. The thermal and magnetic overload detections are typically used together in a motor protection relay. The wiring diagram of an overload relay is shown below and the connections of an overload relay symbol may seem like two opposite question marks otherwise like s symbol.

The overload relay working function is discussed below. Available in svg png jpg dxf dwg formats. Overload trips symbols for use in electrical pneumatic and hydraulic schematic diagrams.