Electronic Thermal Overload Relay Symbol

The overload relay working function is discussed below.

Electronic thermal overload relay symbol.

Overload relay connection diagram. Overload trips symbols for use in electrical pneumatic and hydraulic schematic diagrams. 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.

Citation needed electronic overload protection relays measure motor current and can estimate motor winding temperature using a thermal model of the motor armature system that can be set to provide more accurate motor protection. Available in svg png jpg dxf dwg formats. Olrs are used in combination with the contactors. The relay are switching devices activated by signals.

Though there are different types of overload relays the most common type is the bimetallic thermal overload 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 thermal and magnetic overload detections are typically used together in a motor protection relay.