Motor Controllers Terminal Terminology Pole The immovable end

Motor Controllers Terminal Terminology Pole: The immovable end, or terminal, of a set of contacts. On a multiple throw device it may be called the common terminal. Throw: The movable end, or terminal, of a set of contacts. Single Pole / Single Throw OFF IN OUT

Motor Controllers Terminal Terminology Pole: The immovable end, or terminal, of a set of contacts. On a multiple throw device it may be called the common terminal. Throw: The movable end, or terminal, of a set of contacts. Single Pole / Single Throw ON IN OUT

Motor Controllers Terminal Terminology Pole: The immovable end, or terminal, of a set of contacts. On a multiple throw device it may be called the common terminal. Throw: The movable end, or terminal, of a set of contacts. Single Pole / Double Throw ON OUT OFF OUT IN (common)

Motor Controllers Terminal Terminology Pole: The immovable end, or terminal, of a set of contacts. On a multiple throw device it may be called the common terminal. Throw: The movable end, or terminal, of a set of contacts. Single Pole / Double Throw OFF OUT ON OUT IN (common)

Motor Controllers Terminal Terminology Pole: The immovable end, or terminal, of a set of contacts. On a multiple throw device it may be called the common terminal. Throw: The movable end, or terminal, of a set of contacts. Double Pole / Single Throw OFF OUT IN IN

Motor Controllers Terminal Terminology Pole: The immovable end, or terminal, of a set of contacts. On a multiple throw device it may be called the common terminal. Throw: The movable end, or terminal, of a set of contacts. Double Pole / Single Throw ON OUT IN IN

Motor Controllers Terminal Terminology Pole: The immovable end, or terminal, of a set of contacts. On a multiple throw device it may be called the common terminal. Throw: The movable end, or terminal, of a set of contacts. Double Pole / Double Throw ON OUT OFF OUT IN IN

Motor Controllers Terminal Terminology Pole: The immovable end, or terminal, of a set of contacts. On a multiple throw device it may be called the common terminal. Throw: The movable end, or terminal, of a set of contacts. Double Pole / Double Throw OFF OUT ON OUT IN IN

Motor Controllers Terminal Terminology Common: Terminal on a controller that brings power in to or takes power out from the movable contacts. Normally Open (NO): Terminal on a controller that is connected to the contacts that are not touching and therefore do not allow current to flow until they are pushed together. . Normally Closed (NC): Terminal on a controller that is connected to the contacts that are touching and therefore allow current to flow until they are pushed apart. . Normally Closed Common Normally Open Spring pushes arm up to make connection at NC contact

Motor Controllers Terminal Terminology Common: Terminal on a controller that brings power in to or takes power out from the movable contacts. Normally Open (NO): Terminal on a controller that is connected to the contacts that are not touching and therefore do not allow current to flow until they are pushed together. . Normally Closed (NC): Terminal on a controller that is connected to the contacts that are touching and therefore allow current to flow until they are pushed apart. . Load pushes arm down to make connection at NO contact 50 lbs Normally Closed Common Normally Open

Motor Controllers and What They Do 24 Hour Timer: Activates a device or system such as a sprinkler or pump to cycle on or off at a given time.

Motor Controllers and What They Do Repeat Cycle Timer: Activates a device or system such as a sprinkler or pump to cycle on or off at a specified interval.

Motor Controllers and What They Do Thermostat: Activates a temperature controlling device such as a heater or fan to maintain a constant temperature.

Motor Controllers and What They Do Humidistat: Activates a humidity controlling device such as a fan or ventilator when humidity levels must be removed from an atmosphere.

Motor Controllers and What They Do Photoelectric Switch: A switch that turns a device on and off when light levels reach a given point. Commonly used on yard and security lights.

Motor Controllers and What They Do Limit or Micro Switch: A switch that will limit movement, sense movement to a preset location or sense a load and then activate a device such as a conveyor motor, a sump pump or an unloading auger. Small and compact in size, they are the most common type of controller found in processing agriculture.

Motor Controllers and What They Do Pressure Switch: A switch that senses pressure in an air or water system and turns the compressor or pump on or off to maintain a constant range of pressure in the system.

Motor Controllers and What They Do Magnetic Contacts or Relays: A fancy switch that uses an electromagnet to open or close its contacts. Rely on an outside source to activate the magnetic. Pole Throw SPST Relay Poles Throws DPDT Relay Poles Throw (internal) 4 PST Relay