Why Class 2 Chargers Make Your Laptop Tingle — and Why Class 1 Doesn't
Quick Answer: The tingle, vibration, or buzz from your laptop charger comes from leakage current — a small AC current that Y-capacitors route from the 240V mains to your device chassis. Class 2 chargers (2-pin, no active earth) have no safe exit for this current, so it reaches you. Class 1 chargers (3-pin, earth pin connected) give it a low-resistance path straight to earth ground — problem eliminated. MOKiN TrueGround is a Class 1 grounded GaN charger built specifically to fix this.
You bought a compact GaN charger. It charges fast, runs cool, and fits in your pocket. Your MacBook Air, Dell XPS, ThinkPad, ZenBook, or HP Spectre x360 still tingles, vibrates, or buzzes when you rest your hands on it. That's not a GaN problem. It's a Class 2 problem — and it's been built into every 2-pin charger since the beginning. Metal-bodied phones — iPhone models, Samsung Galaxy builds — feel it too, just more faintly. Here's exactly why it happens and what actually fixes it.
In a Class 2 charger (2-pin, or 2-pin with 1 dummy plastic pin), Y-capacitor leakage current has nowhere safe to go — so it flows to your laptop chassis and into you. A Class 1 charger (3-pin, with a live earth connection) routes that same current straight to earth ground. MOKiN TrueGround is that Class 1 charger in a compact GaN design.
The 2-Pin Tingle Is a Safety Architecture Problem, Not a Defect
Your charger is not broken. It is working exactly as designed — and that design has a structural limitation that has been present in 2-pin chargers since the beginning of portable computing.
Every compact USB-C laptop charger is a switched-mode power supply (SMPS). To pass electromagnetic compatibility (EMC) certification, every SMPS uses Y-capacitors — small components that bridge across the internal isolation barrier to filter high-frequency switching noise. Without them, your charger would fail SIRIM (Malaysia), CE (Europe), and FCC (US) compliance. With them, there is a continuous capacitive coupling between the 240V AC mains and the charger's DC output.
In a Class 2 charger — defined by IEC 62368-1 as a device relying on double insulation alone, with no earth-ground connection — that coupled AC voltage appears on the charger output, travels through the USB-C cable, and reaches the metal chassis of your laptop. IEC 62368-1 sets the maximum permitted leakage at 250 µA. When your palms rest on a MacBook Air, Dell XPS 15, Lenovo ThinkPad, Asus ZenBook, HP Spectre x360, or Microsoft Surface Laptop while it's charging, your body completes the circuit to earth. You feel the 50 Hz AC — as a tingle, vibration, or buzz.
This is not a manufacturing fault. It is the predictable physics of a 2-pin charger on 240V mains, and no revision to a Class 2 design can eliminate it. The only structural solution is Class 1.
How a Class 1 Charger Rewrites the Physics of Leakage Current
A Class 1 charger is defined by its third pin: the protective earth conductor. This is not a grounding connection for the charger's internal electronics — it is a dedicated low-impedance path that electrically connects the charger's output circuit to the earth ground in your building's wiring.
Here is what changes: when Y-capacitor leakage current appears on the output rails, it now has two possible paths back to the mains neutral. Path A: through the earth ground wire — impedance of a few milliohms. Path B: through you — impedance of several thousand ohms. Ohm's law is unambiguous. Virtually all leakage current flows through Path A. The voltage on your laptop chassis drops to near-zero relative to earth. You feel nothing.
The Y-capacitors are still there. The leakage current is still generated. The difference is entirely in what happens to it next — and that difference is the earth pin. MOKiN TrueGround is a Class 1 grounded GaN charger — the world's first compact GaN charger with a fully connected earth pin that provides this low-impedance leakage path. Learn more about how the technology works on the TrueGround™ Technology page.
MOKiN TrueGround — eliminate it, don’t tolerate it
Class 1 grounded GaN charger. Leakage current routed safely to earth — before it reaches you. Choose your wattage:
Why Upgrading to a GaN Charger Didn't Stop the Tingle
Gallium Nitride (GaN) transistors are a real improvement in charger technology — they switch faster, run cooler, and allow for significantly smaller designs. If you own a compact GaN brick, it genuinely charges faster and wastes less energy than the silicon charger it replaced. GaN is a better power transistor. It has nothing to do with insulation class.
The IEC insulation class system — Class 1 or Class 2 — describes whether a charger has an earth-ground connection. It says nothing about the transistor technology inside. A GaN charger with 2 pins (or 2 pins with a plastic dummy earth pin) and no active earth connection is, by IEC definition, a Class 2 device. It still has Y-capacitors. It still generates leakage current. It still has no earth path for that current to follow. The tingle remains — regardless of how efficient, fast, or compact the GaN design happens to be.
The vast majority of compact GaN chargers sold on Shopee and Lazada today are Class 2. This is not a criticism of GaN. It is a statement of what GaN technology does and does not address. MOKiN TrueGround is a Class 1 grounded GaN charger — it combines GaN's efficiency with a functional earth-ground pin, making it the first compact charger that delivers both fast charging and zero leakage at the chassis. GaN and Class 1 are not mutually exclusive — TrueGround is proof.
240V, Tiled Floors, Tropical Humidity: Why the Tingle Is Amplified in Malaysia and Singapore
Leakage current is proportional to mains voltage. The governing formula is straightforward: I = V × 2π × f × C. Double the voltage, roughly double the leakage. This is not theoretical — it is measurable in every Class 2 charger on every Malaysian and Singaporean wall socket.
Malaysia's standard is 240V at 50 Hz. Singapore's is 230V at 50 Hz. The US operates at 120V at 60 Hz. The same Class 2 charger produces approximately twice the leakage current in Kuala Lumpur or Singapore compared to an identical unit used in New York — and it is still operating within the IEC 62368-1 limit both times. "Within safe limits" and "noticeably unpleasant" are not mutually exclusive outcomes.
Two local environmental factors compound the effect. Tiled floors — standard in Malaysian and Singaporean homes — have lower surface resistance than carpet, creating a better electrical return path when you're barefoot or in thin socks. Tropical humidity lowers skin resistance, increasing the effective current your body conducts. The result: a Class 2 charger that produces a barely perceptible sensation in a dry, carpeted apartment overseas can produce a clearly uncomfortable vibration in a tiled home in the Klang Valley or in a Singapore HDB flat. For users in our region, the case for a Class 1 charger is not just theoretical — it is felt daily.
How to Check Your Charger's Class in 10 Seconds
You do not need a multimeter or a datasheet. Pick up the charger and look at the wall plug end.
- 2 pins, no active earth → Class 2. Leakage current reaches the chassis. The tingle will not go away with this charger. Note: many Class 2 chargers in Malaysia come with a plastic dummy earth pin to open the socket shutters — the plug fits a Malaysian 3-pin socket, but the earth is plastic, not metal, so it is still Class 2.
- 3 metal pins, earth pin present → likely Class 1. Check that the earth pin is electrically connected (functional, not cosmetic — see note below).
For a second confirmation, look for the IEC marking printed on the charger body. The double-square symbol (a square inside a square, □□) means Class 2 — double insulation, no earth. If you see it, the charger is Class 2 regardless of how many pins the plug has.
Important — the dummy pin trap: many chargers in Malaysia and Singapore use a plastic (non-conductive) dummy earth pin so the plug fits our 3-pin BS 1363 socket and opens the safety shutters — but that pin carries no current and provides zero ground protection. A separate variant uses a metal third pin that is not wired internally. In both cases, the plug looks like Class 1; the charger behaves like Class 2. The only test that catches this is measuring continuity between the earth pin and the output terminal. MOKiN TrueGround's earth pin is fully electrically connected — it is a functional Class 1 grounded GaN charger, tested and certified, not a three-pin cosmetic design.
Class 1 vs Class 2 at a Glance
| What to compare | Class 2 — 2-pin | Class 1 — MOKiN TrueGround |
|---|---|---|
| Wall plug | 2 pins — no earth (many have a plastic dummy earth pin for socket fit) | 3 metal pins — earth pin active + electrically connected |
| Protection method | Double insulation only | Basic insulation + protective earth |
| IEC body symbol | □□ (double square) | ⏚ (earth ground) |
| Y-capacitors? | Yes — leakage path open to chassis | Yes — leakage routed to earth ground |
| Leakage at laptop chassis | Up to 250 µA (IEC 62368-1 limit) | Near-zero — diverted to earth |
| Laptop tingle on MY / SG mains | Common — MacBook, Dell XPS, ThinkPad, ZenBook, Surface | Eliminated |
| Phone tingle (metal body) | Possible — iPhone, Samsung Galaxy metal frames | Eliminated |
| Effect of 240V / 230V mains | ~2× the leakage vs US 120V | No change — always near-zero |
| GaN technology? | Yes — most compact GaN bricks | Yes — GaN + Class 1 in one charger |
| Available on Shopee / Lazada? | Yes — widely available, all wattages | Yes — mokin.my · 20W to 140W |
The Tingle Has a Permanent Fix. It's Class 1.
MOKiN TrueGround is the world's first compact Class 1 GaN charger — engineered to eliminate leakage current entirely, not limit it to 250 µA. 20W, 33W, 45W, 65W, and 140W for every laptop and device.
Shop MOKiN TrueGround →Frequently Asked Questions
What is the simplest way to explain Class 1 vs Class 2 charger?
Class 2 = 2-pin (often with a plastic dummy earth pin for socket fit), no active earth ground, leakage current ends up at your laptop chassis. Class 1 = 3-pin with a live earth connection, leakage current is safely diverted to earth ground before it can reach you. The difference is a single physical pin and the internal wiring that connects it — but the result for the user is the difference between a perceptible tingle and nothing at all.
Why does my laptop buzz or vibrate when I charge it?
The reason your laptop vibrates when charging is leakage current — a small AC current that Y-capacitors inside your 2-pin charger couple from the 240V mains to your laptop chassis. With no earth ground in a Class 2 charger, this current appears on the chassis surface. When your hands rest on the keyboard or metal palm rest, your body completes the circuit to earth and you feel the 50 Hz AC as a buzz, vibration, or tingling sensation. The permanent fix for laptop charger leakage current is a Class 1 charger with a functional earth pin, such as MOKiN TrueGround. See also our complete guide to laptop charger leakage current.
I bought a GaN charger and my laptop still tingles. Why?
Because GaN technology addresses charging efficiency — not insulation class. A compact GaN charger with 2 pins (including those with a plastic dummy earth pin) is a Class 2 device regardless of its GaN internals. It still has Y-capacitors, it still generates leakage current, and it still has no earth ground to divert that current away from the chassis. GaN made your charger smaller and faster. It did not change the physics of leakage current. Only a Class 1 earth-grounded charger can do that — and MOKiN TrueGround is the only compact GaN charger that qualifies.
Is it safe to keep using a Class 2 charger if I feel the tingle?
For most healthy adults, a Class 2 charger operating within the IEC 62368-1 limit of 250 µA is not acutely dangerous — this current level is generally below the threshold for involuntary muscle response. The sensation is unpleasant, but not immediately hazardous in normal conditions. That said, the threshold is not zero: the risk profile rises with Malaysia's 240V or Singapore's 230V mains (approximately twice the leakage of US mains), wet or humid conditions, and direct prolonged skin contact with metal chassis surfaces. A Class 1 charger eliminates the current at the source — "within safe limits" is not the same outcome as "none at all."
Does my phone tingle from a Class 2 charger too?
Yes, if your phone has a metal chassis. iPhone models with aluminium side frames and Samsung Galaxy flagship builds with metal structures can carry the same Y-capacitor leakage current from a Class 2 charger. The sensation is generally milder than on a laptop — phones have smaller surface area and are usually gripped differently — but the root cause is identical. A Class 1 charger like MOKiN TrueGround eliminates leakage at the source for both laptops and phones simultaneously.
How do I know if my current charger is Class 1 or Class 2?
Count the wall plug pins: 2 pins = Class 2 (watch out — some have a plastic dummy earth pin that looks like a 3-pin plug but is still Class 2). 3 metal pins = likely Class 1 (verify the earth pin is electrically connected, not a plastic dummy or cosmetic metal pin). Check the charger body for the IEC marking: the double-square symbol □□ means Class 2. For the most reliable answer, look up the product datasheet — IEC insulation class is a mandatory disclosure under IEC 62368-1 certification. If it says "Class II" or "Double Insulated," it is Class 2.
What is MOKiN TrueGround and how is it different from regular chargers?
MOKiN TrueGround is a Class 1 grounded GaN charger — the world's first compact GaN charger with a fully connected, electrically active earth-ground pin. Unlike Class 2 GaN chargers, its earth pin is bonded to the internal output circuit, providing a low-impedance path that diverts Y-capacitor leakage current to earth ground rather than to the laptop chassis. The result is near-zero leakage at the chassis — the permanent engineering fix that no Class 2 design, however efficient, can match. Available in 20W, 33W, 45W, 65W, and 140W.
Last Updated: May 12, 2026
