KCD4 Rocker Switch

Types of the KCD4 rocker switch

What is a KCD4 rocker switch?

KCD4 rocker switch is a common type of circuit switch hardware products, is a small high-capacity power switch that is suitable for many home appliances and office equipment, which is more applicable than other switches. KCD4 rocker switch is generally used in water dispenser, treadmill, computer speakers, battery car, motorcycle, ion television, coffee pot, platoon insert, massage machine, etc., mainly for household appliances.

KCD4 rocker switches are popular in many kinds of systems because of their ease of use. Because the function usually turns off when the button is released or when a timer automatically turns off, they don’t require the same attention as other switches, such as a toggle switch.

A KCD4 rocker switch is also known as a Ship-shaped Switch or Seesaw Switch. Internally, its mechanical structure is similar to a toggle switch, but the actuator is boat-shaped. Boat-shaped switches are often used as power switches for electronic equipment.

KCD4 rocker switches are electrical switches that are equipped with a spring-loaded button. When the button is pressed in one position, a circuit is completed. If the button is released, the spring-loaded operation pushes the button back to its resting position and the circuit is open.

Some rocker switches operate more than one circuit on the same button. An excellent example is a power door lock switch. When the lock button is pressed, the power lock actuator is commanded to lock. When the button is released, the switch springs back to the resting position, and power no longer is sent to the lock actuator to lock the door, though it remains in the locked position. The other end of the rocker switch is the unlock button. When it is pressed and released, the same function occurs with the lock actuator for the unlocked position.

Some rocker switches activate a timer and when the button is released, the function continues to operate until the timer turns off, such as a rear window defogger grid button.

The most common rocker switch is made in single-pole, single-throw (SPST) circuitry. It is useful as the common ON-OFF switch that controls a single electronic (a.k.a. load). For more complicated applications, rocker switches can be made with multiple poles and throws.

General classification:

  1.  [SPST]Single pole single throw: 1 moving contact and 1 static contact. There’s only one channel.
  2. [SPDT]Single pole double throw: 1 moving contact and 2 static contacts, which can connect the static contacts on both sides respectively.
  3. [DPST]Double pole single throw: 2 moving contacts and 2 static contacts, there are 2 channels.
  4. [DPDT]Double pole double throw: 2 moving contacts and 4 static contacts, 4 channels (2 static contacts on both sides).

So we have no waterproof and waterproof rocker switch series, such as KCD1/KCD2/KCD3/KCD4/KCD5 rocker switch.

Fault Solution to the General Rocker Switch:

Here shall briefly introduce the fault solution to the general rocker switch.

Fault description:

When the circuit is connected, turn on the switch, lamp on it still keep bright or can not come back, and usually goes with the air switch tripping.


There is a metal sheet inside the rocker switch, in the middle, there’s a spring fulcrum. If the spring moves or the plastic stent become aging or distorting, the switch will not be such flexible as before. Users can first cut off the power and then separate it to see what’s the reason. If it is not for the plastic part damages, it can be fixed maybe. The zero lines inside the switch are straight, and it has nothing to do with the switch components. Therefore, if there’s an air switch tripping, it may be caused by damage to the zero line’s insulation layer. Users can clip the damaged part and re-connect the circuit. And ensure the insulation. Besides, the fault can also be caused by the short circuit of the indicated lamp’s feet, if in that case, users can just re-connect the wire.

Rocker Switch Wiring Diagram

Example of SPST rocker switch, We will now go over the wiring diagram of a rocker switch, so that you can know how rocker switches are internally constructed.

This will help you visualize how rocker switches work so that you can know how to connect them.

Below is the internal construction of an SPST rocker switch:

 IP68 Waterproof KCD4 Rocker Switch

Based on this diagram above of the internal construction of a rocker switch, you can see that it can be in one of two states. It can be turned to one side or turned to the other. This allows you to flip a device on or off. The metal-bearing snaps down the switch so that it makes contact with one of two sides, depending on which side the switch is flipped to.

Now that you have an idea of how rocker switches are constructed internally, let’s go over the wiring diagram so that you will know how to connect a rocker switch to a circuit.

As shown below, rocker switches have 3 electrical connections.

The diagram below represents the schematic diagram for an SPST KCD4 rocker switch:

Waterproof Rocker Switch

Pin 1 is where the rocker switch receives the input power. Pin 2 is where the accessory that the switch is going to turn on is connected. Pin 3 is where the switch is either connected to the ground or left open.

Below is a pictorial representation of the schematic diagram:

KCD4 Rocker Switch


  • Introduction ofIP68 waterproof KCD4 rocker switch

What is a waterproof KCD4 rocker switch?

It designed based on a normal rocker switch with waterproof function, so it can prevent the water from inside the rocker switch when it used outdoor and on water surfaces.

When start designing the KCD4 rocker switch?

FILN company began to product and design the KCD4 waterproof switch series in 2016. It is very popular all over the world, especially in the USA market.

The introduction of the KCD4 waterproof rocker switch series as follows :

How many kinds of voltage can the waterproof rocker switch have?

The range of voltage could be 3V,6v,12v,24v,36v,110v,220v,380v,440V.

What current of rocker switch can be reached?

It has designed a high-current ship-type switch that could reach 30A at 12v and 250V. Its power can reach 5000W.

What is the size of the mounting hole of the KCD4 rocker switch?

It has 3 sizes that can be chosen, like 28X22, 30X22, 31X22mm.

How about the waterproof degree of a switch?

It can be reaching IP67 and IP68.

How many colors of a KCD4 rocker switch?

It can be made red, yellow, green, blue, white, black and orange, etc. We also can use LED as the light source.

How many types of KCD4 rocker switch for the use function?

It has ON-OFF, ON-ON,ON-(OFF),ON-(ON),ON-OFF-(ON),(ON)-OFF-(ON) etc 7 function.

How many different styles are there on the surface of the rocker switch? Can the KCD4 rocker switch be customized with a custom logo?

The rocker switch surface has a stainless steel surface, painted surface, and plastic surface, and can support the customization of various logos on the rocker switch surface.

What international certifications are there for rocker switches?

Rocker switch has CE, UL, CQC, ROSH certification, etc.

Where are waterproof KCD4 rocker switches usually used?

The waterproof rocker switch is used very widely, usually used in kitchen equipment, yacht equipment, automation equipment, electrical products, baby carriages, cars, motorcycles, refrigerator refrigeration, etc.

What is the MOQ of the rocker switch?

FILN is a direct factory that produces waterproof switches, so there is no MOQ limit, and you can order from one.

 IP68 Waterproof KCD4 Rocker Switch

Above is a waterproof ON-OFF DPST rocker switch, the surface is transparent, it also can be silver print, black print, stainless steel, and aluminum alloy.

Clear and firm marking; Clean and beautiful appearance, no deformation, no damage, no cracking; No corrosion, no bad plating; Each component shall be firmly connected without loosening or falling off; Flexible switch operation, no dead, no obvious friction。

Product Item: KCD4-0111-21N

Panel Mount Diameter: 22*30mm

Contact Way: solder pin

Install Way: Buckle

Lamp Type: LED

Rated voltage: 3v, 5v, 6v, 12v, 24v,13v, 110v, 120v, 220v, 240v, 250v, 380v

Lamp Color: Red,white,blue,green,black,yellow

Shell Material: plastic

Cover: Rubber

Base Material: PA66 nylon

Terminal Material: brass

Applications: Coffee machine, kitchen equipment, household appliances, automobiles, medical equipment, industrial equipment, etc

Current: 15A, 20A, 30A

Working temperature: -25℃ ~ +85℃

Rating: 30A 250VAC

Contact resistance: Test within 1KHz current ≤200mΩ

Insulation resistance: Apply DC500V between terminals and between terminals and housing, measure one minute later ≥100MΩ

Withstand voltage: Apply AC1500V, 0.5mA, 10 seconds between terminals, Apply AC3000V, 0.5ma, 10 seconds between the terminal and the housing No breakdown or flashover

Electrical endurance: At rated load, 30 cycles per minute for a total of 10,000 cycles Appearance and feel are qualified Contact resistance≤2Ω Terminal temperature rise ≤55K Withstand pressure test qualified

Terminal Strength: A static load of 60N pushed inward is applied to the top of the terminal for 60 seconds,  terminal damage, fall off, switch function is normal.

Weldability: Dip the terminal into the molten tin bath at 235±5℃ for 3±0.5 seconds, More than 90% of the submerged area is covered with tin

Welding heat resistant: The welded part of the terminal is immersed in the molten tin furnace at 260±5℃ for 3±1 second OR Manual iron welding, welding temperature 350±5℃, welding time 3±1 second.

Do not apply pressure on the terminals during welding, The body has no obvious deformation Mechanical performance, electrical performance test qualified

High-temperature resistance: It was placed in the environment of 85±2℃ for 72 hours, and then it was placed in the natural environment for 1 hour before testing Resistance to hot and humid: It was placed at 40±2℃ with humidity between 91% and 95%RH for 96 hours, and then it was placed in the natural environment for 1 hour before testing.

Low-temperature resistance: It was placed in the environment of -25±2℃ for 12 hours, and then placed in the natural environment for 1 hour before testing

The temperature of alternating: Change the temperature according to the temperature and time are shown in the figure, repeat 5 cycles in a row, and then test after 1 hour in the natural environment.

Appearance and feel are qualified; 2.  Contact resistance≤2Ω; 3.  Qualified in withstand pressure test; 4.  Mechanical qualification

  • introduction of the company

Yueqing Yulin Electronic Co., Ltd, which is founded in 1998, is a professional Push Button switch /indicator light/rocker and guitar switch manufacturer with ISO9000 management system certification in domestic.

We have over 20 years of history in producing and developing the push button switch series, indicator light series, rocker switch series, and guitar switch series, and keep developing 1~2 new series production each year. Now, we have about many series push button switches, indicator lights, rocker switches, guitar switches, and more than 30 patents.

At present, the company has 235 employees, including 23 salesmen, 10 technicians, 6 quality personnel, and 20 administrative and management personnel.

Our goal is to provide customers with professional product services and customized solutions.

CNFILN strives to be a leader in segments.

No matter the series you choose, all of our switches offer an advanced design, quick break contacts, a self-cleaning feature, and high reliability. Furthermore, they have long lives, durable, and easy to install. And we have obtained a number of certification certificates including CCC, CE, RoHS, and UL.

We focus on enhancing the intangible assets. What we seek is satisfying our customers’ needs. So we always keep the company at its best in perseverance by transmission in the market. With the expansion of the international market, we swear to be the global leader in the industry of switch.

Corporate mission: ingenuity China, scientific and technological innovation, subversion of the future, push the world

Corporate vision: create the world’s safest, most customer-informed, most beautiful switch, become the world’s first

Core values: customer first, honesty and trustworthiness, hard work, quality-oriented, continuous innovation

If you are interested, please contact us.

Our official website is www.indicatorlight.com / www.buttonswitch.cn / www.pilotlamp.cn

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