KW4-3Z-3 Micro Limit Switch, 28mm Lever, 3 Terminals, 250VAC/125VDC 5A - 10 Pack
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Enter appliance or equipment model number to verify compatibility with this part
Replaces Part Numbers
KW4-3Z-3 Micro Limit Switch
Key Features
- Model: KW4-3Z-3
- Actuator: 28mm long hinge lever arm
- Terminals: 3-pin configuration for Normally Open (N/O) and Normally Closed (N/C) circuits
- Electrical Rating: 5A at 125VDC / 250VAC
- Function: Snap-action switch designed to control the movement of mechanical parts in electrical systems.
Replaces / Cross-Reference Part Numbers
- KW11-3Z
- KW11-3Z-3
- SS-01
- SS-5
- V-15-1C25
- D2SW-3L2H
- WS2-WBZ3L2B5
- LXW5-11G1
- Z-15GW22-B
Compatibility & Fitment
- Designed for use in a wide range of applications including appliances, 3D printers, CNC mills, and other general-purpose electrical automation projects.
- Fitment depends on matching physical dimensions, actuator type (28mm lever), and electrical specifications (5A, 125/250V).
When to Replace
- Switch fails to actuate or operates intermittently.
- The circuit remains open or closed regardless of lever position.
- Visible damage, such as a broken lever or cracked housing.
- Audible click is absent or feels inconsistent during actuation.
Installation Tips
- Disconnect all power to the equipment before beginning installation.
- Identify and connect wires to the appropriate terminals: Common (C), Normally Open (NO), and Normally Closed (NC).
- Ensure the mechanical component correctly engages and releases the lever without excessive force or over-travel.
- Securely mount the switch body to prevent movement during operation.
-
PRECISION CONTROL
BlueStars's Limit switches feature 3 terminals and are primarily designed to control the movement of mechanical parts. -
DURABLE BUILD
It is equipped with high-quality aluminum alloy and thermoplastic materials for superior conductivity and high reliability. -
EASY TO INSTALL
Installing a Limit Switch is easy for any DIY handyman and takes only 30 seconds. -
SAVING SOLUTION
BlueStars brings DIY solutions to help you deal with any trouble.
CONNECTING LIVES, ENERGIZING MOMENTS
BlueStars - #1 source of high-quality electrical parts
Compatible Models
Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering
Loading compatible models…
Color
Green
Material
Plastic / Metal
Actuator Type
Short Straight Hinge Lever — Momentary / Snap Action
Lever Arm Length
28mm (1.1")
Lever Width
4mm (0.16")
Contact Configuration
SPDT (1NO + 1NC) — 3 Terminals
Rated Voltage
125V / 250V AC | 125V DC
Rated Current
5A
IP Rating
IP40 (Dustproof)
Body Size (L x W x H)
20 x 10 x 7mm (0.8" x 0.4" x 0.27")
Mounting Hole Diameter
~2mm (0.08")
Mounting Hole Center Distance
~10mm (0.4")
Operation Speed
0.1mm/s – 1m/s
Mechanical Life
1,000,000 operations min.
Certifications
UL
FAQs
Suggestions
Common Model Number Locations
Need help finding your model number? Select your appliance or lawn equipment below for location diagrams
- Above the refrigerant valves on the back of the air conditioner
- On the side of the unit near the run capacitor or electrical lines that go into your home
- On either side of the exterior
- On the back of the unit where the power cord is located
- In the cool air exhaust port
- To the left of the fan opening, on the weather barrier
- Below the control panel
- On either side of the exterior
- Behind the front grill on the frame
- On the door frame
- On the inside of the tub wall
- Behind the control panel
- On the door
- Inside the edge of the unit
- On the back exterior
- On the door
- On the side of hose storage
- Inside the edge of the unit
- On inside of the door
- On the door frame
- On the back exterior of the unit
- On the exterior side of the unit
- Behind the control panel
- On the inside of the door
- On the door frame
- On the exterior side of the unit
- At the top of the unit
- On the inside of the dryer door
- On the door frame
- Under the washer lid
- On either side of the exterior
- On the back exterior of the unit
- On the door frame
- On the exterior side of the unit
- On interior wall
- On the control panel
- On side of door
- On the right-hand side of the vent, under the control panel
- On the interior wall of the microwave (microwave model number only)
- On the door frame
- On the rear panel
- On the exterior back of the unit
- Inside the top part of the vent duct (in down-draft models)
- Underneath a burner
- Underneath a knob
- Underneath the cooktop (lift-up style)
- Bottom of cooktop
- On an exterior wall
- On an inside wall
- On the door frame
- On the right-hand side of the vent, under the control panel
- On the interior wall of the microwave (microwave model number only)
- On the door frame
- On the rear panel
- Behind the control panel
- Under the front surface unit
- On the door frame
- Interior side panel
- On the exterior of the unit
- On the inside of the lower storage compartment wall
- On top the hood
- Behind the filter
- Under the hood
- On the inside of the door
- On the exterior back of the unit
- Inside on the rear wall
- On the exterior side of the unit
- On door jamb
- On rear of frame
- Behind front panel
- On ceiling of refrigerator
- On interior wall
- On the inside of the door
- Behind crisper drawer
- Behind kickplate
- On ceiling of refrigerator
- On interior wall
- On door frame
- Behind crisper drawer
- Behind kickplate
- On ceiling of freezer
- On interior wall
- On the inside of the door
- Behind kickplate
- On the exterior side of the unit
- On inside of the door
- On the door frame
- On the back exterior of the unit
- On the front exterior of the unit
- On the control panel
- Inside the lid
- Under the lid on the frame
- On the exterior of the unit
- At the top of the unit
- On the inside of the dryer door
- On the door frame
- Under the washer lid
- On either side of the exterior
- On the top center of heater
- On the exterior of the unit
- On the starter housing
- On the side of the housing, behind the top handle
- On the side of the motor housing
- Near the rear grip
- On the top or sides of the engine housing
- On the gas tank
- On the recoil housing
- On the handle bars
- On top of the engine cover
- Near discharge chute, often behind chute flaps
- On rear of the deck, behind the engine
- Dash panel
- Back of mower/rear bumper
- Underside of the seat
- Lower side of hood, near engine
- Frame (beneath the seat, footrest)
- Mower deck
- Underside of the seat
- Frame beneath or near the seat
- Back of mower/rear bumper
- Lower left side between gas tank and mower deck
- Under the foot plate
- On the rear of the blower
- Inside of vacuum canister
- Side of the motor housing
- On the rear base of the vacuum
- On the bottom of the belly of the vacuum
- On the frame near the engine
- On the side of the auger housing
- On the lower rear of the snow blower between wheels
- On the side of the motor housing
- On the shaft
Select an appliance to see where its model number is located.
