How does a dtdp switch work

The terms pole and throw are also used to describe switch contact variations. A single-throw switch has one pair of contacts that can either be closed or open. A double-throw switch has a contact that can be connected to either of two other contacts; a triple-throw has a contact which can be connected to one of three other contacts, etc. Pole: The amount of circuits controlled by the switch is indicated by poles. Single pole SP switch controls only one electrical circuit. Double pole DP switch controls two independent circuits.

Throw: The number of throws indicates how many different output connections every switch pole can connect its input. When the switch is ON, the two terminals of switch are connected and current flows between them. When the switch is OFF the terminals are not connected, so current does not flow. The power supply to a circuit is switched by the SPST switch. A simple SPST switch is shown in figure below.

These types of switches are also called toggle switches. This switch has two contacts one is input and other output. From the typical light switch diagram, it controls one wire pole and it makes one connection throw.

When the switch is open or off then there is no current flow in the circuit. The single pole double throw SPDT switch is a three terminal switch, one for input and other two for the outputs. It connects a common terminal to one or the other of two terminals. From the circuit, it clearly demonstrates what happens when the SPDT switch is moved back and forth. Here we are controlling the two circuits or paths via one way or source.

Other mounting options are panel mount, often on the front of an electrical box, or DIN rail, as well as several mounting variations for unique situations. There also tends to be a correlation between size and the mounting type, with smaller switches being found on PCBs while larger switches are panel mounted or DIN rail mounted.

Besides the difference between manual and electronic actuation, there are switches designed to be used with bulky gloves while others that require small screwdrivers or specialized tools. Among all the different actuation options, perhaps the most common decision to make will be choosing between a raised or flat actuator level. While some switches are rated for only a few volts and less than a tenth of an amp, others are rated for tens of thousands of volts and hundreds or thousands of amps.

While current and voltage ratings are usually correlated, that is not necessarily always the case. The same design features that allow a switch to survive high currents are not the same features that allow a switch to survive high voltages. Always confirm that the switch can handle both the expected current and voltage ratings of the application. In general, this refers to ingress protection or IP ratings, which indicate the ability to withstand dust or water infiltration.

But it can also include protection from vibration or physical blows. There are vandal-proof or hardened switches that are designed specifically to operate even after direct attacks from users.

There are other features that may be specific for a particular line of switches or applications, but these attributes are found with all switches manufactured. While the variety may seem infinite, most switches fit under a handful of different types. The examples here are mechanically operated and actuated, while being found most frequently in, but not limited to smaller portable or embedded systems.

DIP switches are an array of switches mounted into one through-hole or surface mount package. With through-hole mounting, these are commonly designed to fit into a breadboard but are usually small enough that they can easily be included in finished products.

The array of switches usually consists of a series of SPST switches, where all switches can be used separately or in tandem to create a single number, with low voltage or low current signals. These switches are ideal for situations where users need to make semi-permanent selections but without the potential of losing jumper blocks. They come in a variety of shapes, mainly piano, slide, and rotary, of which rotary switches will be discussed in more depth below.

DIP switches are commonly used in applications where there are option settings on a device, such as a transmitter or receiver and are often found in industrial applications with the same usage. They are also popular on development kits for rerouting signals from a central microcontroller to different peripherals.

They are easier to use than jumpers and have a greater variety of options but are still not designed for constant or frequent use. Despite this, they are easy to use when necessary. This allows a user to select one of many different discrete options, usually between 4 and 16 positions. They can either be actuated with a small screwdriver or with fingers if there is a raised actuator knob. Like the linear DIP switches, they are either through-hole or surface mount, but unlike their linear counterparts, the outputs can either be in BCD or hex.

They share many of the same benefits, with a small footprint and ease of use, but limits users to one output - for better or worse. They are also not designed for continuous use, with lifetime rotation counts in the tens of thousands versus the hundreds of thousands or millions other switches may offer.

Slide switches , as their name implies, are used by sliding the actuator in one direction or the other. When used as power switches, perhaps their most popular usage, these are often found in the SPST configuration. As such, they are usually rated for higher voltages and higher currents than DIP switches as well as for more frequent use. While they are commonly SPST, they can sometimes be available with multiple poles or throws.

However, multiple throws can make it difficult to slide the switch to the desired location. While comparatively larger in their capacity than DIP switches, they are still relatively low power and most often surface or through-hole mounted onto PCBs.

They are sometimes used as more readily accessible DIP switches in consumer electronics, but this application sometimes finds it difficult to balance ease of use and accidental actuation. Tactile switches are buttons that have a click that can be felt, hence the name tactile switches, but the click is also usually heard.

They are quite small and always momentary. Designed for low voltage, low current signals, they make up for their paltry electronic capabilities with physical toughness. Tactile switches are expected to have near continuous use with life cycles measured in the hundreds of thousands, millions, or even tens of millions of actuations.

In addition to this, they can be easily sealed for a high IP rating. They are always mounted on a PCB but can be through-hole, surface mount, or edge mount. While they usually only have one pole, it is not uncommon for them to have multiple throws.

Tactile switches are also extremely common, offering a wide variety of options in both features and manufacturers. Their ubiquity, small size, and toughness have made them very popular with consumer electronics like game controllers, remote controls, garage doors, and even in medical, automotive, or industrial applications that need a simple momentary switch for interfaces. Rocker switches have a pivot in the middle, toggling between two options. These switches can be momentary but are typically not.

They are frequently found operating as power switches for mains level circuits, as they are often rated for higher voltages and currents. Rocker switches can be panel mounted on the outside of a device or cabinet but can also be through-hole or surface mount. They are occasionally illuminated with an LED or, in older models, incandescent bulbs, which are often used to show the status of the switch in the on or off position.

They can also be IP rated, allowing them to be used in harsher environments. Their easily understood interface and actuation is one of the main reasons they have been found so often in consumer electronics.

While they tend to be slightly more expensive than many other switches in this field, it is mostly due to their larger size and additional features. Rocker switches can be found in industrial applications, often in conjunction with toggle switches, and at times have covers to prevent accidental actuation. These types of switches can also be found in vehicles to switch on and off different features, such as four-wheel drive. Push button switches are most often referred to simply as buttons.

When the switch is connected one way, the lamp will turn on, while the LED is off. When connected the other way, the LED then turns on, and the lamp shuts off. We we specialize in manufacturing the highest quality switches for the mmwave industry. We can manufacture you switches to any custom size or specification, please consult Mi-Wave for further information. View More. As the manufacturing source, we have top sales engineers ready to answer all your questions and quote you on product needs.