Application of Waterproof Micro Switch on Car Charging Port Cover-Unionwell—Professional Manufacturer of Micro Switches

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Application of Waterproof Micro Switch on Car Charging Port Cover

2026-09-03

The new energy vehicle charging port cover (body side charging compartment cover) relies on a waterproof micro switch for opening and closing status detection feedback. It belongs to the weak current safety signal component of the whole vehicle and is installed inside the wheel arch/charging port compartment of the vehicle. It is exposed to rainwater washing, high-pressure water spraying during car washing, condensation, sediment, and high and low temperature environments all year round, and must be waterproof and dustproof.
What is a waterproof micro switch for car charging port cover
The waterproof micro switch used for the car charging port cover is an "invisible safety sentinel" hidden behind the charging door. It is essentially a highly sealed precision electronic switch designed to sense whether the charging port cover is "open" or "closed" and transmit the status in real-time to the vehicle's brain.
The reason for emphasizing "waterproofing" is that the charging port cover is located on the outside of the vehicle, facing harsh environments such as rainwater, high-pressure water guns for car washing, and splashing water on the road surface. Ordinary switches are prone to water ingress failure or short circuit in this environment.
Therefore, this type of switch usually needs to achieve a protection level of IP67 or even higher, which means that it can not only completely prevent dust, but also work normally after being immersed in water at a depth of 1 meter for a short period of time
G303 (M3 type housing) waterproof micro switch product features
IP67 fully sealed dustproof and waterproof;
Compact and compact in size: an ultra small sealed structure designed specifically for space limited in car/portable devices;
Rich triggering options: straight plunger, multiple swing rods to choose from; The circuit supports SPST-NO/SPST-NC/SPDT; The output methods include various styles such as solder joints and pre molded leads, and support customization;
Working temperature: -40 ℃~+85 ℃, stable rebound of shrapnel under high and low temperature environments, no deformation of the shell, meeting the weather resistance requirements of automotive standards;
Safety certification: Has UL, ENEC, CQC, RoHS, REACH multinational safety certification; The factory has passed the IATF16949 and ISO9001 automotive quality management system certifications and can supply Unionwell automotive projects;
Support customization: customized development based on pressure, wire length, built-in resistor, handle form, and modified material of the shell.
Main parameters of G303 (M3 type housing) waterproof micro switch
Rated load: 0.1 A 125/250 VAC; 0.1 A 48 VDC； 3 A 12 VDC（μ1E5）
Contact form: SPDT (1NO+1NC)/SPST-NC/SPST-NO optional
Operating force: Standard part number 130 gf Max (customizable for 180 gf, etc.)
Contact resistance: ≤ 100 m Ω (initial, without wire type)
Insulation resistance: ≥ 100 M Ω (500 VDC)
Electrical strength: 500 VAC (50~60 Hz)
Operating frequency: Electrical 120 times/minute (0.1 A), 10-30 times/minute (3 A); Mechanical 120 times/minute
Anti vibration: 10~55 Hz, displacement 0.75 mm (p-p)
The role of waterproof micro switch in car charging port cover
Accurately detect the status of the charging port cover: check whether it is closed properly and whether it is fully opened;
Safety interlock: The state of the cover determines whether it can be charged;
Anti theft and anti misoperation.

G303 (M3 type housing) waterproof micro switch can replace OMRON D2AW
In the demanding applications of the automotive industry, the reliability and supply stability of waterproof detection switches are crucial. The G303 (M3 type housing) waterproof micro switch is a direct alternative developed for the OMRON D2AW and Cherry DJ/DK series, achieving seamless integration from structural dimensions, electrical parameters to service life, making your selection more effortless. G303 (M3 type housing) waterproof micro switch can replace OMRON D2AW
Advantages of G303 (M3 shell) compared to OMRON D2AW
Direct replacement: structure/electrical performance/lifespan (≥ 300000 cycles) benchmarking OMRON D2AW;
Cost reduction and efficiency improvement: The BOM cost of the entire vehicle has been directly reduced, and the localization rate has been increased;
Fast delivery: 7-15 days delivery, fully automated production line guarantee;
Customized on demand: Terminals, levers, and parameters can be flexibly adjusted.

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