ISO9001 / IATF16949/ ISO14001 etc

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UnionwellWaterproof Automotive Micro Switch Manufacturer — IP67 Sealed Switches for Vehicle Systems

Unionwell has manufactured waterproof automotive micro switches for over 30 years. Our IP67-rated sealed micro switches deliver reliable performance in door lock detection, seat adjustment, charging gun control, and seat belt reminder systems — with 100,000+ mechanical cycles and full IATF16949 certification. Annual production capacity exceeds 4 million units for automotive applications.

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micro switches manufacturers
UNIONWELL

China high quality waterproof automotive switch

Unionwell is an expert in automotive waterproof micro switches, with a variety of automotive switches such as the G3 sealed subminiature micro switch, G304/6/9 silent waterproof switches, and G19 car seat waterproof switches. With strong IP67-level protection, reliable performance can be ensured even in harsh environments. These switches are durable and ideal for automotive applications that require consistent reliability.
Our waterproof automotive switches are designed with versatility in mind, offering a variety of actuator and terminal options to meet different needs. Each switch is CE certified, reflecting our commitment to high quality and strict adherence to international standards.
waterproof automotive switch

G3
Sealed Subminiature Micro Switch

Experienced automotive waterproof switches with tens of thousands of successful application cases.
g304-6-9

G304/6/9
Clip Type Silent Sealed Micro Switch

G304/6/9 series adopts sealed and silent structure, commonly used in automotive door applications
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G9A
Sealed Miniature Micro Switch

G9A sealed miniature micro switch, compact size, complete terminal types, is the ideal choice for automobile manufacturers
Subminiature Seal Micro Switch

G10 B
Subminiature Seal Micro Switch

G10B is mainly used in the control valve of automotive charging guns. It has the characteristics of long life and high reliability, and complies with IP67 design.
waterproof seat sealed adjustment switch

G19
Waterproof Seat Sealed Adjustment Switch

It has good sealing performance, strong durability, and a variety of operating lever heights are optional, suitable for different models
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G20
Automotive Seat Belt Reminder Switch

Automotive Seat Belt Reminder Switch is suitable for seat belts of different models, and can stably and reliably detect the insertion of seat belts.
micro switch manufacturer-Unionwell G23

G23
Motor Electronic Lock for Charging

This switch has both manual and automatic unlocking, accurate locking position, clear gear position, strong durability and reliability

What Is a Waterproof Automotive Micro Switch?

1.Definition: A waterproof automotive micro switch is a compact electromechanical component designed to operate reliably in wet, dusty, or high-vibration environments within vehicles.
2.Core functions:It provides precise position detection and status feedback for critical vehicle systems including door locks, seat adjustment mechanisms, charging connectors, and seat belt systems.
3.Protection rating:Unlike standard micro switches, waterproof automotive variants feature IP67-rated sealing that prevents moisture and dust ingress even during exposure to water spray, high humidity, or temporary submersion.
4.Safety Systems: From airbag deployment to brake light activation,  seat belt reminder switches are essential components of safety systems, ensuring prompt response and reliable performance in critical situations.
5.Application scenario overview:  Commonly installed in hood latch detection, door lock status feedback, seat belt buckle detection, charging gun control valves, and EV charging electronic locks.
Unionwell's G3/G304 series are specifically engineered for these demanding automotive environments, with IP67 sealing and 100K+ cycle reliability.

Definition

How Does a Waterproof Automotive Micro Switch Work?

Stage 1 — Mechanical Trigger: When a vehicle component moves (e.g., door lock actuator, seat rail, charging connector), it physically actuates the micro switch's snap-action mechanism.

Stage 2 — Sealing Protection: The IP67-rated housing prevents moisture ingress during the switching action, ensuring reliable contact operation even in wet conditions.

Stage 3 — Electrical Signal Feedback: The contact state change (NO↔NC) generates an electrical signal sent to the vehicle's control module (BCM/ECU), triggering the corresponding system response.

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Why IP67 Rating Matters for Automotive Applications

Automotive microswitches are installed in complex environments for extended periods, facing the effects of rain, dust, mud, oil, and temperature fluctuations. Therefore, a suitable IP protection rating is essential for ensuring the safety of automotive switches.The core value of IP67 protection in automotive applications:

  • IP67 vs IP40/IP50：IP40 only prevents the ingress of larger solid objects and does not provide waterproofing; IP50 offers some dust protection but cannot withstand liquid environments; IP67 achieves complete waterproof and dustproof protection and supports complex outdoor working environments.
  • Protection requirements for different automotive installation locations:The engine compartment is susceptible to high temperatures, rain, oil, and cleaning fluids, requiring a higher level of sealing protection. The interior of car doors is constantly exposed to rainwater infiltration and a humid environment; IP67 rating ensures stable door lock detection signals. The area under seats is prone to dust and liquid residue accumulation and is susceptible to mechanical vibration; a waterproof and dustproof design reduces the risk of malfunction.
  • Actual malfunction risks caused by water ingress:Moisture entering the microswitch can cause corrosion of terminals and wiring harnesses, increasing contact resistance. Moistened contacts can lead to poor contact and signal interruption. For systems such as door status detection and charging status feedback, it can also generate erroneous signals, affecting the overall vehicle control logic.
  • Unionwell IP67 Testing Standards:Unionwell automotive microswitches undergo rigorous testing according to IP67 protection requirements, including a 30-minute immersion test in 1 meter of water and a dust environment test, ensuring compliance with international waterproof certification requirements.
Customized Waterproof Micro Switches
waterproof micro switch in water

Waterproof Automotive Switch Series Comparison

Series Dimensions (mm) IP Rating Operating Force Contact Rating Mechanical Life Key Application Datasheet
G3 12.8×6.6×6.0 IP67 0.49-3.92N 0.1A 125/250VAC 100K cycles Door lock detection pdf
G304/6/9 10.8×6.8×5.2 IP67 0.98-2.94N 0.1A 12VDC 100K cycles Hood latch detection pdf
G9A 15.6×6.4×9.5 IP67 1.47-4.9N 0.1A 125VAC 100K cycles General automotive pdf
G10B 12.8×6.6×5.8 IP67 0.49-2.45N 0.1A 125VAC 500K cycles Charging gun control valve pdf
G19 20.5×6.4×10.2 IP67 1.96-7.84N 1A 125VAC 100K cycles Seat position detection pdf
G20 18.5×6.6×8.5 IP67 0.98-3.92N 0.1A 125VAC 100K cycles Seat belt reminder pdf
G23 22.0×12.5×15.0 IP67 — 3A 12VDC 50K cycles EV charging electronic lock pdf

G3 Car Waterproof Micro Switch

G303 Sealed Subminiature Micro Switch

G3 waterproof automotive switch and Waterproof Push Button Micro Switch Good sealing performance, various installation dimensions meet different installation requirements, widely used in automobile control.

  • IP67 waterproof and dustproof
  • Possess global safety certification
  • Equipped with various operating handles
  • Complete range of terminal blocks
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micro switch manufacturer-Unionwell G3

Waterproof automotive switch with attention to detail

Unionwell micro switches offer superior reliability with global CE certification for waterproof automotive micro switches. This ensures that they meet high standards and are suitable for a wide range of automotive applications. In addition, the switch meets IP67 protection standards, making it ideal for automotive uses where water and dust resistance is critical.

Our switches are durable and can withstand up to 100,000 operations, providing long-term reliable durability. A variety of mounting form factors are available to meet different automotive installation requirements. And support high rated voltage (125/250VAC). In addition, these switches are carefully designed to withstand extreme temperature ranges from -40°C to +85°C, ensuring optimal functionality under harsh conditions.

waterproof-switch-design

IP67 Sealing

Tested per IEC 60529: immersion in 1m depth water for 30 minutes with no internal moisture ingress. Unionwell's G3 series features a patented double-sealing structure that maintains IP67 rating throughout the switch's entire lifecycle.
High Rated Voltage

Electrical Rating

Rated 0.1A at 125/250VAC. Contact resistance: ≤50mΩ initial. Insulation resistance: ≥100MΩ at 500VDC. Dielectric strength: 500VAC for 1 minute.
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Mechanical Life

100,000+ mechanical cycles (G3/G304/G9A/G19/G20) to 500,000+ cycles (G10B). Electrical life: 50,000+ cycles at rated load. Tested per automotive industry standards.
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Terminal & Actuator Options

Terminal types: solder terminal, PC terminal, wire lead, quick connect tab. Actuator types: pin plunger, lever (various lengths), roller lever, simulated roller. Contact form: SPDT (Common + NO + NC).
Operating Temperature Range

Operating Temperature Range

Rated range: -40°C to +85°C. Validated through thermal cycling tests (1000 cycles, 30min dwell per extreme). Contact resistance change: ≤20mΩ after temperature cycling.
Environmental Testing

Environmental Testing

Vibration resistance (10-55Hz, 1.5mm amplitude, 2 hours per axis); Shock resistance (50G, 11ms, half-sine); Salt spray resistance (48 hours, 5% NaCl, 35°C); Humidity resistance (96 hours, 95% RH, 40°C).
car door micro switch
hood latch micro switch
Seat Sealed Adjustment Switch
Seat belt micro switch

iP67 micro switch for automotive applications

Door Lock Status Detection

A micro switch detects the physical position (locked/unlocked) of the door lock tongue and sends feedback to the BCM.
Technical requirements: IP67 waterproof, compact size, high reliability.
Recommended series: G3 Sealed Subminiature.

Hood Latch Detection

A micro switch detects whether the hood is fully closed and locked.
Technical requirements: Vibration resistant, high temperature resistant, quiet operation.
Recommended series: G304/6/9 Silent Sealed.

Seat Position Adjustment

A micro switch detects the position of the seat rail/backrest and sends feedback to the ECU for seat and airbag control memory.
Technical requirements: Multi-position detection, wide temperature range.
Recommended series: G19 Waterproof Seat.

Seat Belt Reminder System

A micro switch detects the seat belt buckle insertion status and triggers the warning light/buzzer.
Technical requirements: High sensitivity, fast response.
Recommended series: G20 Seat Belt Reminder.
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CE certification waterproof automotive switch Advantages
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Factory Direct Supply659b61baedb9e92784

Factory direct supply

Direct from our 65,000m² facility in Huizhou, Guangdong. Annual capacity: 250 million switches (4 million+ automotive). MOQ: negotiable for first orders.
Contact us
Quality Assurance659caa46edf6b66670

Quality Assurance

IATF16949, ISO9001, ISO14001 certified. Products carry CE, RoHS, REACH marks. Full documentation: PPAP, APQP, control plans, 8D reports.
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Automated Production659caa47d32dd58850

Automated production

40+ automated assembly lines with in-line vision inspection. Cpk ≥ 1.33 for critical dimensions. Annual output: 4M+ units, <50 PPM defect rate.
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Warehouse Storage659caa48a180a75025

Warehouse & storage

Customization Capability — "20+ R&D engineers, 15+ years experience. Development cycle: drawing → sample (7-10 days) → mass production (15-30 days). Custom actuator, terminal, housing, marking.
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why choose Unionwell

Unionwell is a waterproof automotive switch manufacturer in Huizhou, Guangdong with 30 years of manufacturing experience. It covers an area of ​​more than 65,000 square meters, has obtained CE certification from many countries around the world, has introduced advanced equipment in the industry, and has a professional R&D team!
  • 1

    Quality Certification

    We have formed a complete quality management system and have passed ISO9001, IATF16949, ISO14001 certifications, with high-quality and reliable performance!
  • 2

    Efficient Production Capacity

    Unionwell has introduced advanced automated production technology in the industry, with an annual production capacity of more than 250 million switches, including more than 4 million waterproof automotive switches.
  • 3

    Customized Service

    Unionwell has many R&D engineers with 20 years of work experience, and has many years of experience in OEM and customized micro switches, which can meet your various project needs.
micro switch company
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Custom parameter table

Customization to Your Needs
Parameter Customization Range
Operating Force 0.49N - 7.84N (Adjustable)
Actuator Type Pin Plunger / Lever / Roller / Simulated Roller
Terminal Type Solder / PC / Wire Lead / Quick Connect
Sealing Level IP40 / IP50 / IP67
Contact Form SPDT (1C) / SPST-NO / SPST-NC
Housing Material PBT / Nylon PA66 / PPS (UL94 V-0)
Temperature Range -40°C to +85°C (Standard) / -40°C to +125°C (Special)
Mounting PCB / Panel / Snap-in / Screw

Custom Waterproof Automotive Switch Solutions .

Simple process for customizing complex switches

Inquiry
01

Inquiry

drawing
02

Drawing Confirmation

(3-5 days)
Free sample
03

Free Sample

(7-10 days)
Mass product
04

Mass Production

(15-30 days)
QC-test
05

QC

We begin by meticulously planning and setting up, ensuring afficlency and omfort.
shipping
05

Shipping

Our Certification

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FAQ

  • 1

    What is the difference between IP40, IP50, and IP67 waterproof automotive switches?

    IP40 provides basic protection against solid particles, while IP50 improves dust protection. IP67 offers complete dust sealing and water resistance for harsh environments. Unionwell G3, G304, and G9A series IP67 switches are designed for under-hood and exterior automotive applications.

  • 2

    How to choose the right operating force for automotive micro switches?

    The required operating force depends on the application. Door lock systems typically use 0.49-3.92N, while seat adjustment systems require 1.96-7.84N. Unionwell provides customizable force options from 0.49N to 7.84N for precise automotive control.

  • 3

    What is the expected lifespan of a waterproof automotive micro switch?

    A waterproof automotive micro switch typically provides 100K-500K+ mechanical cycles and 50K+ electrical cycles. Unionwell G10B and G23 series feature extended lifespan designs for demanding automotive and EV applications.

  • 4

    What certifications do Unionwell waterproof automotive switches hold?

    Unionwell waterproof automotive switches are certified with IATF16949, ISO9001, ISO14001, CE, RoHS, and REACH. The company also supports automotive quality documentation, including PPAP, APQP, and 8D reports for OEM projects.

  • 5

    Can waterproof micro switches work with EV charging systems?

    Yes. Unionwell G10B micro switches are used for charging gun control applications with 500K+ cycle durability, while G23 series supports electronic lock systems. IP67 protection ensures reliable operation in outdoor EV charging environments.

  • 6

    What is the typical lead time for custom waterproof automotive switches?

    Standard waterproof automotive switches can be delivered within 3-5 days. Custom solutions usually require 25-45 days for the first order and 15-20 days for repeat orders, depending on design requirements and production volume.

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