A relay is an electrical control device. It is an electrical appliance that causes the controlled quantity to undergo a predetermined step change in the electrical output circuit when the change in the input quantity (excitation quantity) meets the specified requirements. It has an interactive relat... read more
How to choose a relay:1. First understand the necessary conditions ①The power supply voltage of the control circuit, the maximum current that can be provided; ②Voltage and current in the controlled circuit; ③How many sets and types of contacts are needed for the controlled circuit. When selecti... read more
Relay test ①Measure contact resistance: Use the electrical barrier of a multimeter to measure the resistance of the normally closed contact and the moving point. The resistance value should be 0; and the resistance value of the normally open contact and the moving point is infinite. From this, it c... read more
Although solid-state relays are not as popular as electromagnetic relays, they are also commonly used electrical devices. They are both relays. What are the differences? Let’s talk briefly today. Electromagnetic relay is an electronic control device, which plays the role of automatic adjustment, sa... read more
1. The role of ordinary shunt resistors Ordinary current transformers can convert a primary current with a larger value into a secondary current with a smaller value through a certain transformation ratio, which is used for protection, measurement and other purposes. For example, a current transfor... read more
The difference between solid state relay and ordinary relay The comparison between traditional relays and solid-state relays is related to many types. The difference between electromagnetic relays and corresponding solid-state relays is explained below: 1. Structural difference: The electromagnetic... read more
It is mainly composed of iron core coil, armature (moving iron core), spring, moving contact, static contact and some terminals. Static contacts include normally closed contacts and normally open contacts. Under normal conditions, the moving contact is closed to the normally closed contact. As long... read more
The Latching Relays is an automatic switching element with isolation function. When the change of the excitation amount in the input loop reaches a specified value, the automatic circuit control device can make the controlled electric quantity in the output loop undergo a predetermined step change.... read more
1. The task of relay protection In order to ensure the safe operation of the power supply and distribution system and avoid the impact of overcurrent caused by overload and short circuit on the system, different types of overcurrent protection devices should be installed in the power supply and dis... read more
Copyright © Zhejiang Great Electrical Co., Ltd. All Rights Reserved.
