10Pcs KW12-3 Micro Roller Lever Limit Switch PCB Mount
10Pcs KW12-3 Micro Roller Lever Limit Switch PCB Mount
10-Pack KW12-3 Micro Roller Lever Arm Limit Switch — PCB Mount
Get reliable, snap-action switching performance with this set of 10 KW12-3 Micro Roller Lever Limit Switches. Compact, fast-acting, and rated for a wide range of voltages and temperatures, these PCB-mount micro switches are a go-to choice for electronics engineers, hobbyists, and DIY builders alike. Whether you're building automation systems, repairing appliances, or prototyping robotics, these switches deliver consistent open/close actuation every time.
Key Features
- Model: KW12-3
- Rated Voltage: AC 125V – 250V
- Current Rating: 5A
- Operating Temperature: -40°C to 70°C
- Dimensions: 20 × 10 × 6 mm (L × W × H)
- Terminal Type: PCB (Printed Circuit Board) terminals
- Actuator: Roller lever arm for precise mechanical triggering
- Material: Durable plastic housing
How It Works
The KW12-3 uses a proven snap-action reed mechanism. An external mechanical force — applied via the roller lever arm — acts on the internal spring reed. At a critical actuation point, the reed snaps instantaneously, rapidly opening or closing the contact circuit. When the force is removed, the reed reverses and resets with equal speed. This snap-action design ensures:
- Minimal contact gap with short, precise travel
- Fast-break/fast-make switching action
- Low actuation force requirement
- Consistent and repeatable performance across many cycles
Wide Range of Applications
These versatile micro switches are suitable for use in:
- Computer mice and peripheral devices
- Automotive electronics and car accessories
- Communications equipment
- Test and measurement instruments
- Gas water heaters and gas burners
- Small household appliances (microwave ovens, rice cookers, etc.)
- Floating ball valve equipment
- Building automation systems
- Electric power tools
- DIY robotics and 3D printers
Package Contents
- 10 × KW12-3 Micro Roller Lever Limit Switches
Made in China.
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Frequently Asked Questions
Q: What voltage and current are the KW12-3 micro roller lever limit switches rated for?
A: The KW12-3 limit switches are rated for AC 125V to 250V with a current rating of 5A, making them compatible with a broad range of low-to-mid voltage electronic applications including appliances, automation systems, and DIY electronics projects.
Q: Are these KW12-3 micro switches suitable for PCB mounting?
A: Yes. The KW12-3 switches feature PCB terminal connections, designed to be soldered directly onto a printed circuit board. Their compact 20 × 10 × 6 mm footprint makes them ideal for space-constrained board layouts.
Q: Can these limit switches be used in extreme temperature environments?
A: These micro switches have an operating temperature range of -40°C to 70°C, making them suitable for both cold-storage automation and moderately high-heat environments such as appliance interiors or outdoor enclosures.
Q: How many switches are included in the pack?
A: Each order includes 10 individual KW12-3 micro roller lever limit switches, giving you spares for prototyping, repairs, or multi-unit builds at an excellent value.
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.