fixed contact การใช้

• Fixed contacts are inexpensive but prone to loss of electrical connection.
• Fixed contacts may be backed up with a spring.
• The majority of the wire spring relays manufactured in the 1960s had twelve fixed contacts.
• Battery contacts may be fixed contacts, flexible contacts, or some combination of the two.
• When the switch is closed, current flows through the hinged pivot and blade and through the fixed contact.
• The moving contacts are held away from the fixed contacts by a phenolic paper pattern called a " card ".
• Power supply studs are the fixed contact elements of a stud / skate or stud / ski collector electrical connection system.
• The moving contact is propelled by the moving core; the force developed by the electromagnet holds the moving and fixed contacts together.
• Knife switches consist of a flat metal blade, hinged at one end, with an insulating handle for operation, and a fixed contact.
• A normally open ( make ) contact, a normally closed ( break ) contact, or both can be provided for each fixed contact.
• Each contact is either a fixed contact, which does not move, or is a moving contact, and is made from a short piece of wire.
• In an overcurrent condition, a value of current will be reached that overcomes the control spring pressure on the spindle and the braking magnet, causing the metal disc to rotate towards the fixed contact.
• :It seems obvious to me that when the relay is not energized ( no current in the coils ) the armature ( moving contact ) is touching the left hand fixed contact ( because of the spring ).
• Providing the relay is free from dirt, the metal disc and the spindle with its contact will reach the fixed contact, thus sending a signal to trip and isolate the circuit, within its designed time and current specifications.
• In most applications, such as telephony, it is desirable to be able to return the wipers to a " home " position; this is at the beginning of rotation, at one end of the array of fixed contacts.
• When an electric current is passed through the coil it generates a magnetic field that activates the armature, and the consequent movement of the movable contact ( s ) either makes or breaks ( depending upon construction ) a connection with a fixed contact.
• Combination of fixed and flexible contacts are a better solution, but this is subject to an open circuit upon movement in the direction away from the fixed position; the spring contact compresses and allows the battery to move away from the fixed contact.