Electronic Thermal Overload Relay Symbol

Although there are several types of overload relays available in the market however the most frequent type of relay is the.

Electronic thermal overload relay symbol.

In a wiring diagram the symbol for overload contacts may look like two opposed question marks or an s. 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. 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.

The overload relay working function is discussed below. Relay symbols and electromagnets. 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.

Olrs are used in combination with the contactors. 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. Overload relay connection diagram.