The overload relay working function is discussed below.
Electronic thermal overload relay symbol.
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.
Although there are several types of overload relays available in the market however the most frequent type of relay is the.
Relay symbols and electromagnets.
Olrs are used in combination with the contactors.
Available in svg png jpg dxf dwg formats.
In a wiring diagram the symbol for overload contacts may look like two opposed question marks or an s.
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.
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.
Overload trips symbols for use in electrical pneumatic and hydraulic schematic diagrams.
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.