Pass-through switch connection diagram: Instruction + Video

Pass-through switch connection diagram: Instruction + Video Pass-through switch: how to connect , features, varieties. Before choosing and deciding on a purchase, you should still find out what a pass-through switch is, why it is required and what is its distinguishing feature from standard one-, two- and three-key switches. A single-key pass-through switch is required in order to control only one line or circuit for lighting from different points, which are located in several parts of an apartment or cottage. It turns out that with one switch when entering a corridor or room, you will turn on the lighting, and with another, located in a different place, you can turn off the same lighting.

Usually this is often practiced in the bedroom, when a person enters the bedroom and turns on the light near the door .

Then you can lie down and turn off the light at the headboard or bedside table. In two-story houses, everything is easier - turn on the light bulb at the first stage, go up the stairs and you can turn off the light from the second floor.

General information

Selection, construction and differences of through-type switches

Before to assemble a similar circuit for control, you need to pay attention to the following points:

  1. For installation work of the switch-through type, a three-core cable is required - NYM 3 * 1. 5 mm 2 or VVGng-Ls 3 * 1. 5 mm 2 .

  2. Do not try to assemble such a circuit on conventional switches.

The main difference between standard and pass-through switches is how many contacts they have. Simple one-keyers have only two terminals to connect wires (output and input), but there are three through-type terminals! On the ordinary, the lighting circuit is either closed or not, and there is simply no third option.

Note, that it is better to name the pass-through variant not as an element to turn off, but as a switch, because it specifically switches the electrical circuit from one working contact to the second.

Pass-through switch connection diagram: Instruction + Video In appearance from the front, they may appear the same, but the key of the transition element may have an icon that consists of their vertical triangles.

Try not to confuse them with flip-flop or cross-type elements (we'll talk about them in more detail later). These triangles look exclusively horizontally. But on the second side, you can notice the difference - the passage element has 1 terminal on top, and two at the bottom are located at once.

Normal has 1 on top and the same on bottom. Most people confuse switches with single-key switches for these parameters, but two-key switches will definitely not work here, although they also have 3 terminals.

There is a significant difference in how contacts work. When one contact is closed, the second type of switch automatically closes, but two-key switches do not have such a function.At the same time, note that there is no preliminary position when two electrical circuits are open at all.

Details of the question

Switch connection

First of all, it is necessary to properly connect the switch itself in the socket, and for it is worth removing the key, and besides them, there is also an overhead frame. Disassembled, you will immediately notice three terminals for contacts.

The most important task is to find common among them. On high-quality products on the inside, there is always a diagram, and if you understand this, you can easily navigate through it. If you purchased a budget model, or any electrical circuit is still that dense forest for you, then an ordinary tester of Chinese origin will come to the rescue in the continuity mode (you can even use a battery indicator screwdriver).

Using the probes on the tester, you should alternately touch all the contacts and look for the one on which the tester starts "beeping" or shows "0" at any positions of the ON and OFF key. everything is much easier to do with an indicator screwdriver.

After the common terminal is found, a phase from the power cable should be connected to it. It is worth connecting the other two wires to the remaining terminals. And which of them goes where does not matter. The switch should be assembled and fixed in the socket. This is one of the stages of connecting the pass-through switch.

With the second, you should do the same - find a common terminal, connect a phase-type conductor to it, which will go to the lighting device and connect other conductors to the remaining ones.

Wiring diagram for a through-type switch in the junction box

Now the most important thing is to correctly assemble the circuit in the junction box. It must contain four three-core cables:

  • Pass-through switch connection diagram: Instruction + Video Power supply from the switchboard lighting switch.
  • Cable for the first switch and the second.
  • Cable for chandelier or other lighting fixture.

When connecting wires, it is more convenient to navigate by color marking. If there is a three-core VVG cable, then its most common colors are white / gray (this is the phase), blue ("zero") and yellow-green (this is the ground). There is another option - the phase is white / gray, "zero" is brown, and the ground is black. Assembly begins with neutral conductors . It is required to connect the zero core from the cable of the input machine and the zero, which goes to the luminaire at one point using the car terminals.

Next, you need to connect all the grounding conductors if you have a conductor for grounding. In the same way as with the neutral wires, the "ground" should be combined with the lead-in cable with the "ground" of the cable that goes to the lighting. This wire must be connected to the luminaire body.

It remains to connect the phase conductors correctly and without errors. The phase from the input cable should be connected to the phase of the outgoing wire to the common terminal of the first switch.

The common wire from the second switch should be connected to the phase conductor of the lighting wire using a separate clamp. When everything is done, all that remains is to connect the outgoing wires from the two switches to each other, and it does not matter how you will connect them. It is even allowed to confuse the colors, but it's still better if you stick to the colors so that you don't get confused in the future. On this we can assume that the circuit is completely assembled, apply voltage and check the lighting.

And now mark yourself the basic rules that are worth remembering for yourself:

  • The phase from the machine must go to the common conductor of the switch No.


  • The same phase must go from the common conductor of the second switch to the lighting fixture.
  • The remaining two auxiliary conductors should be connected together in a junction box.
  • Ground and zero must be supplied directly without switches directly to the lamps.

Now it's worth talking about lighting control using new switches.

Rocker switches - control from three / four places

What to do if you want to control one of three or four lights points? Then there will be a third and fourth switch from the circuit. It seemed that you only need to buy one more pass-through, but it's not that simple. A switch with three terminals will not work here, because there will be four wires to be connected in the junction box. Here, the use of a rocker switch, or as it is also called, a cross / intermediate / cross switch, will be very useful. Its key difference is that it has four outputs - two at the bottom and the same number at the top.

It is installed just in between two checkpoints. It is worth starting with the junction box, in it you should find two secondary wires from the second and first switches. You need to disconnect them and connect a jump cord between them. Connect those wires from the first to the input, and those that go to the second to the output terminals. The connection diagram of the pass-through switch should always be checked, because it often happens that the output and input are located on the same side.

Naturally, there is no need to push the jump wire itself into the junction box, it is enough that you lead the ends from a four-core cable there. And the switch itself should be placed in any place convenient for you - near the bed, in the middle of the corridor, and so on. The light can be switched on and off from all points. The main advantage of the system is that you can change it endlessly and add as many rocker switches as you like. There will be only two checkpoints (at the end and at the beginning), and in the interval between them there will be at least 13 cross-over.

Useful information

Connection errors

At this stage, the search and connection of the main terminal in the pass-through switch are made error. For some reason, many do not check the circuit and naively believe that the common terminal is the one with only one contact. If you assemble the circuit in this way, the switches will not work properly because they are all dependent on each other. Remember that on different switches the common contact can be anywhere! It is best to call him "live" using an indicator screwdriver or a tester. Most often, this problem can be encountered when replacing or installing switches from different companies.

If everything worked before, but after replacing the circuit it stopped functioning, then you have mixed up the wires.

There may also be such an option that the new switch is not at all passable. It is also important to remember that the backlight inside the product cannot influence the switching principle. Another popular mistake is the incorrect connection of the crossover wires, when both cables from the first pass-through switch are shrunk to the upper contacts, and from the second to the upper ones. Meanwhile, with cross switches, the switching mechanism and the circuit are somewhat different, and the wires must be connected crosswise.


The first disadvantage is that there is no specific position of the OFF or ON keys, which are in the standard ones. If the lamp has burned out and should be replaced, then with such a scheme it may not be immediately clear whether the light is on or off. It will be unpleasant when, when replacing the lamp, it can simply explode near the eyes. In this case, the easiest and safest way would be to turn off the automatic lighting in the dashboard. The second disadvantage of is the large number of connections in the junction boxes.

The more light points you have, the more there are in the junction box. Connecting the cable according to the diagrams without junction boxes will reduce the number of connections, but may increase either the cable consumption or the number of cores several times. If your wiring goes to the ceiling, then you will need to lower the wire from there for each switch, and then lift it up. The best option here is to use a pulse-type relay.

( 3 marks, average 3.

67 of 5 )