Overload Relays Three Pole Teaching Equipment Vocational Educational Equipment

SR6117E Overload Relays Three Pole Teaching Equipment Vocational Educational Equipment For College
1.Working principle and usage
The thermal element of the thermal overload relay is directly or through the current transformer connected to the motor circuit. When the motor is overloaded, the main bimetallic strip is heated to the action temperature, which makes the relay move, and the power circuit of the power failure motor is divided, so that the motor is not damaged by overload. Thermal overload relay action time and the relation of the size of the overload current according to the inverse time, therefore, its thermal characteristic is easy to cooperate with the thermal characteristics of the motor, but also has simple structure, low price, stable performance, convenient use, etc. Therefore, in the 1990s, most squirrel cage rotor motors and partial winding rotor motors still used thermal overload relay as protection of overload, break phase and current imbalance operation. Thermal overload relay can also be used for other electrical equipment to control the heating status of electrical appliances.
2.Technical data
Overload relay (3 – pole 28A & 45A)
Maximum voltage: 600V AC,240VDC.
3.Application range
Thermal overload relay of the scope of application: thermal overload relay for ac 50 hz, rated insulation voltage 660 v, current 0.1 ~ 630 a circuit, it is mainly used for three-phase ac motor overload and phase failure protection. It can also form a starter with an adaptive ac contactor, such as an overview of the diagram thermal relay configuration.
4.Structure and feature
There is a current regulating CAM to adjust the setting current.
There is a temperature compensation device to ensure that the action characteristics are basically unchanged within the ambient temperature range of -20℃ ~ 60℃.
There are reset adjusting knob to adjust the reset mode, manual and automatic two reset state.
There is a stretch spring to make sure the contact action is fast and reliable.
There is a differential phase/three phase unbalance protection device.
The slider/switch position indicator is used to simulate the trip of the thermal relay and display the action status. Through this simulation check and ensure that the auxiliary circuit wiring is correct. When the marking line on the slider is located at the “0” sign, the trip is displayed at the “l” mark.
There is a disconnect button, press the disconnecting button, the normally closed contact opens the serial contactor open circuit, disconnects the load, releases the disconnecting button, and the load is reworked through the contact device.