Understanding Form A, Form B, Form C Contact Configuration Relays
Form C Contact. This is also called a “changeover” device because the common contact changes from the normally closed position to the normally open position when the coil is energized in a relay or a magnetic field is nearby in a reed switch. A form c isolated relay would have three terminals.
These contacts have a common terminal. Web a form c reed switch is essentially a single pole double throw reed switch. Web a single form c contact isn’t much good unless you are trying to design a system whose pl only requires pl a or pl b, but adding a second contact to this device adds the possibility of monitoring the relay. Web a dry contact is one that is a hard contact such as a relay or switch (as opposed to a triac or transistor). They can be part of any type of a relay or auxiliary switch. 2 form c (2 co) signal relay contact switching voltage (max)(vac): One normally open and one normally closed. Web form c is one normally open contact and one normally closed contact with a common terminal between them. When operated the common contact will swing from the normally closed contact to the normally open contact. It is hermetically sealed with 3 leads:
These contacts have a common terminal. This is also called a “changeover” device because the common contact changes from the normally closed position to the normally open position when the coil is energized in a relay or a magnetic field is nearby in a reed switch. Form c contact assembly has three terminals. Web a single form c contact isn’t much good unless you are trying to design a system whose pl only requires pl a or pl b, but adding a second contact to this device adds the possibility of monitoring the relay. 2 form c (2 co) signal relay contact switching voltage (max)(vac): Form y = nc with both terminals disconnected when off. Form c is a combination. Web a form c reed switch is essentially a single pole double throw reed switch. These contacts have a common terminal. It is hermetically sealed with 3 leads: A form c contact is also called spdt.
