On off button symbols12/13/2022 Mechanical switches can be classified into different types based on several factors such as method of actuation (manual, limit and process switches), number of contacts (single contact and multi contact switches), number of poles and throws (SPST, DPDT, SPDT, etc.), operation and construction (push button, toggle, rotary, joystick, etc.), based on state (momentary and locked switches), etc.īased on the number of poles and throws, switches are classified into following types. These are activated by semiconductor action. Mechanical Switches are physical switches, which must be activated physically, by moving, pressing, releasing, or touching its contacts.Įlectronic Switches, on the other hand, do not require any physical contact in order to control a circuit. Latched Switches on the hand, maintain the contact until it is forced to the other position.īasically, Switches can be of two types.Momentary Switches (like push buttons, for example) are used to make momentary contact (for a brief time or as long the button is pressed). Another important characteristic of a switch is its action i.e., whether it is a Momentary or Latched action.For example, a three pole six throw switch is often represented as 3P6T. If the number of poles or throws are greater than 2, then the number is often directly used.Some standard numbers of poles and throws are Single (1 pole or 1 throw) and Double (2 poles or 2 switches).Number of poles and throws are used to describe a switch. A pole represents a contact and a throw represents a contact-to-contact connection.
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