3-Pack KW4-3Z-3 Miniature Micro Limit Switch SPDT Roller Lever
3-Pack KW4-3Z-3 Miniature Micro Limit Switch SPDT Roller Lever
3-Pack KW4-3Z-3 Miniature Micro Limit Switch with Hinge Roller Lever
Upgrade your electronics, automation projects, and appliances with this reliable set of three KW4-3Z-3 Miniature Micro Limit Switches. Featuring a Single Pole Double Throw (SPDT) NO+NC contact form, these compact microswitches deliver fast, precise switching action — perfect for DIY electronics, robotics, CNC machines, 3D printers, and industrial control systems.
Built from durable thermosetting or thermoplastic material and engineered for millions of operations, these microswitches offer outstanding longevity and consistent performance across a wide range of applications.
Key Features
- Momentary Snap Action: Small contact gap and high sensitivity ensure fast, reliable actuation every time.
- SPDT NO+NC Configuration: Versatile 3-terminal design supports both Normally Open (NO) and Normally Closed (NC) circuit configurations.
- Green Hinge Roller Lever: Allows smooth, precise mechanical triggering from multiple directions.
- Wide Temperature Range: Operates reliably from -25°C to +80°C (-13°F to +176°F).
- High Durability: Rated for a minimum of 100,000 electrical operations and 10,000,000 mechanical operations.
- Compact Size: Measures just 23 x 21 x 7 mm (0.91 x 0.83 x 0.28 in.), ideal for tight spaces.
- 365-Day Warranty included for peace of mind.
Specifications
| Model | KW4-3Z-3 |
| Contact Form | SPDT NO+NC |
| Rated Load | 5A / 250V AC |
| Pin Number | 3 Terminals |
| Operation Speed | 0.1mm/s – 1m/s |
| Contact Resistance | 15 mΩ max. (initial) |
| Insulation Resistance | 100 mΩ min. (at DC 500V) |
| Electrical Life | 100,000 operations min. (full load) |
| Mechanical Life | 10,000,000 operations min. |
| Operating Temperature | -25°C to +80°C |
| Dimensions | 23 x 21 x 7 mm / 0.91 x 0.83 x 0.28 in. |
| Material | Thermosetting / Thermoplastic |
| Country of Origin | Made in Mainland China |
Common Applications
- CNC machines and 3D printers (end-stop / limit detection)
- Home and industrial appliances
- Electronic equipment and control panels
- Automatic machinery and robotics
- Communication equipment and instruments
- Power tools and electric motors
Package Contents
- 3 × KW4-3Z-3 Miniature Micro Limit Switch (Hinge Roller Lever)
Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: What does SPDT NO+NC mean on the KW4-3Z-3 micro limit switch?
A: SPDT stands for Single Pole Double Throw. The switch has three terminals: one Common (C), one Normally Open (NO), and one Normally Closed (NC). In its resting state, current flows through the NC terminal. When the roller lever is actuated, the circuit switches to the NO terminal. This makes the KW4-3Z-3 extremely versatile for various wiring configurations in electronics and automation projects.
Q: Can these micro limit switches be used in a 3D printer or CNC machine as end-stops?
A: Yes — the KW4-3Z-3 is one of the most popular micro limit switch models used as end-stops in 3D printers, CNC routers, and laser cutters. The compact 23 x 21 x 7 mm size, hinge roller lever, and momentary snap action make it ideal for precise position detection in these applications.
Q: What is the rated electrical capacity of these miniature micro switches?
A: Each KW4-3Z-3 micro limit switch is rated for 5A at 250V AC, making it suitable for most low-to-medium voltage control circuits. They are designed for low-voltage applications (below 50V AC or 75V DC per EU LVD guidelines) in typical signal and light-load switching scenarios.
Q: How many times can the KW4-3Z-3 be actuated before it wears out?
A: These switches are built to last. Each unit is rated for a minimum of 100,000 full-load electrical operations and an impressive 10,000,000 mechanical operations, making them a durable, long-lasting choice for both prototyping and production use.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.