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ISTMALL · SAMDUCKSA BUTTON CWB 401B
Wide, Flat Pressing Surface
5 Colors · Gersung V-0303A06 Microswitch 
This animation cycles through the available product colors. Please Check Before PurchasingFlat, Round Top — The CWB 401B is a large button with a 98 mm outer diameter. Its flat top differs from the domed CWB 401. Included Components — Includes the body, cover, nut, switch holder, and Gersung V-0303A06 microswitch. The nut is supplied fitted to the body, and the switch is fitted to the holder. Preinstalled Spring — A 200 g spring for Bishi Bashi applications is preinstalled in the button. LED Lamp Sold Separately — Illumination requires a suitable LED lamp and power setup, purchased separately. Holder Assembly — Insert at an angle, then rotate to lock. Please review the assembly guide below before installation. 01 · CWB 401B 
KOREAN ARCADE HERITAGE
Arcade Experience,
|
| CWB 405 | 32 × 50 mm · Rectangular |
|---|---|
| CWB 401B | Ø98 mm outer diameter · Flat, round top |
Ø98 mm is the product's outer diameter. It is not the pressing surface diameter or mounting hole diameter. Check the CWB 401B drawing below before cutting your panel.
CWB 401B Dimension Drawing
Check the outer diameter, top profile, and lower body shape. All drawing dimensions are in mm. The top outer diameter is Ø98 mm.
Click the drawing to open a larger view in a new window.
The top outer diameter and mounting hole diameter are different. Before cutting the panel, check both the drawing and the actual mounting structure. Allow enough space below for the holder, switch, and wiring.
05 · CWB 401B
5 Colors to Match Your Controller
Choose from White, Red, Blue, Green, and Yellow. Assign colors by function or coordinate them with your game and controller design.
White
Red
Blue
Green
Yellow
Color photos are provided as a selection guide.
Actual colors may appear different depending on lighting and display settings.
06 · CWB 401B
Included Parts and Supplied Assembly
Includes the body, cover, nut, holder, and Gersung microswitch. Please check which parts are included and which are sold separately before purchasing.
| Button Body |
1 × CWB 401B button body in your selected color Preinstalled 200 g spring for Bishi Bashi applications |
|---|---|
| Button Cover | Round cover for the CWB 401B included |
| Mounting Nut | Included · Supplied fitted to the body |
| Switch Holder | Included · Holds the LED lamp and microswitch |
| Microswitch |
1 × Gersung V-0303A06 Supplied fitted to the holder |
| LED Lamp | Not included / Sold separately |
CWB 401B Button Cover
Includes a round cover that attaches to the rear of the button.
Mounting Nut
Secures the button to the panel. Supplied fitted to the body.
Holder + Gersung Switch
The microswitch is supplied fitted to the holder. LED lamp is not included.
The nut and switch holder photos show examples of shared CWB series parts. Button input and illumination use separate components. For illumination, provide a suitable LED lamp, power supply, and wiring for your setup.
07 · CWB 401B
Preinstalled 200 g Spring for Bishi Bashi Applications
Inside the button, a 200 g spring for Bishi Bashi applicationsis preinstalled.
Check that the button presses smoothly and returns to its original position without catching. Surrounding clearance, panel mounting, and holder attachment can affect the feel of operation.
Check Surrounding Clearance
Allow enough room to prevent the pressing surface from interfering with other buttons or panel structures.
Check the Holder Attachment
Insert the holder in the direction shown, then rotate to lock. Check the alignment of the white button actuator and the switch actuator.
08 · CWB 401B
Holder Assembly for First-Time Installation
Correct holder orientation and secure attachment help transfer the button's motion to the switch. Review the GIF and step-by-step photos first.
Key Steps: Insert at an Angle → Rotate to Lock
Position the holder at an angle, insert it, then rotate to lock it in place. Do not force it straight in with the white button actuator and the switch's red pin aligned from the start.
01. Insert at an Angle
Angle the holder so the white actuator under the button and the switch's red pin are not directly aligned. Check the engagement position, then push the holder inward.
02. Rotate to Lock
Rotate the holder to lock it with the white actuator directly above the red pin. Pressing the button should operate the switch correctly.
03. Check Retention and Return
Before connecting the wiring, check that the holder stays secure and the button presses and returns smoothly without catching.
Keep the holder angled during insertion
Align the actuator and pin after locking
Do not confuse this with the straight-in insertion method used by the Sanwa OBSA series. If the holder does not fit easily, recheck its orientation and any obstruction. Do not force it or twist it by the terminals. Disconnect power before assembly or wiring.
09 · CWB 401B
Gersung Microswitch Included
When choosing a replacement switch or wiring components, check the supplied switch model and terminal type.
| Manufacturer / Model | Gersung Engineering / V-0303A06 |
|---|---|
| Actuator | Pin plunger |
| Contact Configuration | SPST-NO (1a) · Normally open |
| Electrical Rating | 0.3 A / 24 V DC |
| Operating Force | OF Max. 60 g · Microswitch only |
| Terminal Type | Type A · Solder or #187 tab |
| Supplied Condition | Included, fitted to the switch holder |
NO means the contact is normally open and closes when the button is pressed. The electrical rating above applies to the switch; it is not the required LED lamp voltage.
Specification reference: Gersung Engineering V Series Microswitch Product Information.
10 · CWB 401B
Specifications and Mounting Drawing
| Product | SAMDUCKSA CWB 401B |
|---|---|
| Top Shape | Flat, circular pressing surface |
| Outer diameter: | Ø98mm |
| Lower Body | Ø88mm |
| Panel Cutout | Refer to the Ø88 mm dimension and R3 notches on both sides in the drawing |
| Threaded Section Diameter | Ø24.50 mm as marked in the drawing |
| Colors | Choose from White / Red / Blue / Green / Yellow |
| Microswitch | Gersung V-0303A06 |
| Preinstalled Spring | 200 g spring for Bishi Bashi applications · Preinstalled |
| Included Components | Body · Cover · Nut · Switch holder · Microswitch |
| LED Lamp | Sold separately |
Before cutting the panel or replacing an existing button, check the detailed dimensions and notch positions in the drawing below. Do not confuse the outer diameter with the mounting cutout dimensions.
Click the drawing to enlarge. Units: mm.
11 · CWB 401B
Microswitch Contact Bounce
Please distinguish normal contact switch behavior from persistent input problems during use.
Contact Switch Characteristics
Microswitch contacts may briefly make and break repeatedly during switching, a behavior called contact bounce or chattering. This can vary with operating speed, load, and contact condition.
Check Input Behavior in Your Game
Whether brief contact changes register as duplicate inputs also depends on input processing, such as the controller board's debounce settings. Check the holder attachment and wiring as well.
Persistent input errors should not automatically be treated as normal. If duplicate inputs, missed inputs, or interruptions while holding the button persist, check holder alignment and terminal contact. If the problem continues after correct installation, contact us through eBay messages with details of when it occurs.
Reference: OMRON Chattering FAQ · FAQE20041. This explains general contact switch principles. The microswitch supplied with this product is made by Gersung.
12 · CWB 401B
Appearance of Clear Plastic Parts
Tiny Specks and Fine Scratches in the Clear Top
Small specks or fine hairline scratches may be present inside the clear button top as a result of manufacturing.
Minor manufacturing marks that do not affect normal operation are not considered product defects.
13 · CWB 401B
Frequently Asked Questions
How does it differ from the CWB 401?
The CWB 401 has a raised, domed pressing surface. The CWB 401B has a flat pressing surface.
Is an LED lamp included?
No. An LED lamp is not included. Purchase a suitable lamp separately if you wish to use illumination.
Should I cut a 98 mm mounting hole?
98 mm is the product's outer diameter. Refer to the dimension drawing for the mounting cutout and notch shapes.
Will it fit directly into my existing arcade machine?
Dimensions vary between machines. Check the mounting cutout, internal space, wiring, and existing component specifications first.
How do I secure the switch holder?
Insert it at an angle, then rotate to lock. Do not force it straight in. Refer to the assembly photos and GIF.
SAMDUCKSA CWB 401B
98 mm Outer Diameter · Flat Top · 5 Colors
Gersung Microswitch Included · LED Lamp Sold Separately
Insert the holder at an angle, then rotate to lock.
