SN04 Proximity Switch 4mm – Inductive Auto Leveling Sensor
SN04 Proximity Switch 4mm – Inductive Auto Leveling Sensor
SN04 Inductive Proximity Switch – 4mm Detection, Auto-Leveling Position Sensor
The SN04 Proximity Switch is a compact, high-performance inductive position sensor designed for precise, non-contact object detection. With a 4mm detection distance, wide operating voltage range, and IP67 protection rating, it's ideal for CNC machines, 3D printers, robotics, automation systems, and industrial control applications. Available in multiple configurations — SN04-N, SN04-N2, SN04-P, SN04-P2, and SN04-Y — to suit NPN, PNP, and various output wiring setups.
Made in Mainland China.
Key Specifications
- Models: SN04-N / SN04-N2 / SN04-P / SN04-P2 / SN04-Y
- Operating Voltage: 10V – 30V DC
- Current Consumption: Max. 5 mA
- Output Current: Max. 300 mA
- Detection Distance: 4mm
- Detection Type: Inductive (metal object sensing)
- Response Frequency: Up to 500 Hz
- Cable Length: 145 cm
- Protection Class: IP67 (dust-tight & waterproof)
- Material: Durable plastic housing
- Certification: CCC
- Warranty: 1 Year
Why Choose the SN04 Proximity Switch?
- ✅ Non-contact sensing — no mechanical wear, long service life
- ✅ IP67 waterproof rating — reliable in dusty or wet environments
- ✅ Wide voltage range (10–30V DC) — compatible with most control systems
- ✅ High response frequency (500Hz) — fast and accurate object detection
- ✅ Multiple output types — NPN/PNP variants for flexible wiring
- ✅ 1.45m cable — sufficient reach for most installation scenarios
- ✅ Compact cylindrical form factor — easy to mount in tight spaces
Common Applications
- 3D printer auto bed leveling (e.g. Anet, Creality)
- CNC machine tool position detection
- Industrial conveyor and automation systems
- Robotics and motion control
- Metal object proximity detection on assembly lines
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Frequently Asked Questions
Q: What is the difference between SN04-N and SN04-P proximity switches?
A: The SN04-N features an NPN (normally open) output, meaning it pulls the output signal LOW when an object is detected. The SN04-P features a PNP (normally open) output, pulling the signal HIGH upon detection. Choose NPN for controllers that use a ground-referenced input, and PNP for those requiring a positive voltage trigger. The SN04-N2 and SN04-P2 variants are the normally-closed versions of each, and SN04-Y is a special output configuration.
Q: Is the SN04 proximity switch compatible with 3D printers for auto bed leveling?
A: Yes! The SN04 series is widely used as an auto bed leveling sensor in 3D printers. It works well with popular control boards that operate on 12V or 24V DC systems. Make sure to select the correct output type (NPN or PNP) that matches your printer's control board specifications.
Q: What does the IP67 rating mean for this sensor?
A: An IP67 protection rating means the SN04 proximity switch is fully dust-tight and can withstand temporary immersion in water up to 1 meter for 30 minutes. This makes it suitable for use in demanding industrial environments where exposure to dust, coolant, or moisture is expected.
Q: What is the maximum detection distance of the SN04 sensor?
A: The SN04 proximity switch has a nominal detection distance of 4mm for standard ferrous metal targets. Actual sensing range may vary slightly depending on the target material size and type.