--- product_id: 598150006 title: "Inductive Proximity Sensor SN04-N Normally Open Detection Approach Switch NPN NO with TL PL SN Bracket (Blue, 4 Pack)" price: "116.11 DT" currency: TND in_stock: true reviews_count: 8 url: https://www.desertcart.tn/products/598150006-inductive-proximity-sensor-sn04-n-normally-open-detection-approach-switch store_origin: TN region: Tunisia --- # 5-30V wide voltage compatibility LED indicator for instant status 4mm precise detection range Inductive Proximity Sensor SN04-N Normally Open Detection Approach Switch NPN NO with TL PL SN Bracket (Blue, 4 Pack) **Price:** 116.11 DT **Availability:** βœ… In Stock ## Summary > πŸ”΅ Elevate your automation game with precision sensing that never misses a beat! ## Quick Answers - **What is this?** Inductive Proximity Sensor SN04-N Normally Open Detection Approach Switch NPN NO with TL PL SN Bracket (Blue, 4 Pack) - **How much does it cost?** 116.11 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/598150006-inductive-proximity-sensor-sn04-n-normally-open-detection-approach-switch) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Robust & Ready:** Durable ABS casing and included iron SN bracket ensure stable, long-term mounting. - β€’ **Pinpoint Precision:** Detect metal objects up to 4mm away with laser-sharp accuracy. - β€’ **Plug & Play Wiring:** Clear 3-wire connection (Brown+, Blue-, Black signal) for hassle-free integration. - β€’ **Instant Visual Feedback:** Built-in LED indicator signals detection status at a glance. - β€’ **Universal Voltage Range:** Operates seamlessly between 5-30VDC to fit diverse industrial setups. ## Overview The Inductive Proximity Sensor SN04-N is a high-performance, normally open NPN switch designed for reliable metal detection within a 4mm range. Operating on a versatile 5-30VDC supply and supporting up to 300mA output current, it features a clear LED indicator for real-time status and comes with a sturdy iron SN bracket for easy installation. Ideal for machine tools, automation systems, and DIY projects, this 4-pack offers professional-grade sensing with plug-and-play wiring. ## Description Product description Proximity switch definition An inductive proximity switch consists of high frequency oscillation, detection, amplification, triggering and output circuits. The oscillator generates an alternating magnetic field on the detecting surface. When there is a metal object close to its detecting surface, the eddy current generated in the metal absorbs the energy of the oscillator, which makes it weaken to stop oscillating. The oscillator oscillation and stop vibration of these two states is converted into an electrical signal through the detection, amplification and trigger output circuit. Haldzemo SN04 Inductive Proximity Sensor NPN: common positive voltage, output negative voltage. PNP: common negative voltage, output positive voltage. NO: normally open. NC: normally closed. Difference between normally open (NO) and normally closed (NC) Normally open (NO) is the usual state of the signal output line is disconnected state, no signal output, when sensed to the object is closed, the output signal. Normally closed (NC) is the usual state of the signal output line for the closed state, continuous signal output, when the sense of the object is disconnected, close the signal. LED working indicator signal indicator, when sensing metal objects the light is on for normally open, the light is off for normally closed. Square proximity switch Model: SN04 Detected object: Metal/Iron SN04-N/SN04-P Working voltage: within DC 5-30V SN04-N2/SN04-P2 Working voltage: within DC 6-30V Detection distance: 4mm Wire type: 3 wire (Brown, Black, Blue) Output current: 300mA Response time: 2mS Application The function of proximity switches (also known as non-contact travel switches) is to act when approaching metal, and are widely used in machine tools, metallurgy, chemical industry, light textile and printing industries, in the automatic control system can be used as limit, counting, positioning control and automatic protection link, etc.. SN04 Proximity Switch Shape: Square Shell Material: ABS Size: 18*18*36mm Weight: 50g Color: Blue Wire length: 1.2m SN Bracket Material: Iron Size: 32*18*8.5mm Weight: 15g Color: Silvery With 2pcs M3 screws Wiring Method Brown connect to Positive Blue connect to Negative Black connect to Load (signal output) NPN NO Mode: SN04-N Output Type: NPN NO PNP NO Mode: SN04-P Output Type: PNP NO NPN NC Mode: SN04-N2 Output Type: NPN NC PNP NC Mode: SN04-P2 Output Type: PNP NC Review: Worked perfectly. - Very pleased with the sensors. Placed on a custom built laser engraver and they detected the metal flag. Reliability and repeatability in all four. Review: Will do the job. - met my requirements, but I wish the wire leads were a little longer. ## Features - Inductive Proximity Switch Type: SN04-N, 3 Wire NPN NO. Detecting Distance: 4mm. Supply Voltage: 5-30VDC, Current Output: 300mA. - LED working indicator: signal indicator, when sensing metal objects the light is on for normally open, the light is off for normally closed. - Wiring Method: Brown connect to Positive, Blue connect to Negative, Black connect to Load (signal output). - When proximity switch is close to some target object, it will send out control signal. Widely used for machine tool industry, frequency counters and other automatic control system, or you can use it for DIY 3D Printer. - You will get 4pcs inductive proximity switch + 4pcs SN Bracket ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.3 out of 5 stars 26 Reviews | ## Images ![Inductive Proximity Sensor SN04-N Normally Open Detection Approach Switch NPN NO with TL PL SN Bracket (Blue, 4 Pack) - Image 1](https://m.media-amazon.com/images/I/61RuTQ5Y5vL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worked perfectly. *by B***N on January 21, 2026* Very pleased with the sensors. Placed on a custom built laser engraver and they detected the metal flag. Reliability and repeatability in all four. ### ⭐⭐⭐⭐ Will do the job. *by S***. on July 4, 2025* met my requirements, but I wish the wire leads were a little longer. ### ⭐⭐⭐⭐⭐ Worked well *by A***N on October 28, 2025* Works great and as intended. ## Frequently Bought Together - Haldzemo Inductive Proximity Sensor SN04-N Normally Open Detection Approach Switch NPN NO with TL PL SN Bracket (Blue, 4 Pack) - Taiss 2PCS M12 4mm Sensing DC 5V NPN NO（Normally OpenοΌ‰ 3D Printer LJ12A3-4-Z/BX-5V Cylinder inductive Proximity Sensor Switch Work Voltage 5VDC Special for MCU --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/598150006-inductive-proximity-sensor-sn04-n-normally-open-detection-approach-switch](https://www.desertcart.tn/products/598150006-inductive-proximity-sensor-sn04-n-normally-open-detection-approach-switch) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-02*