AX Rating on a Switch: What the X Means and Which to Buy

What is AX in a switch: the short answer

AX on a switch means the switch is rated to make and break the stated current on lamp loads as well as on plain resistive loads. A 10AX switch can handle 10 amps of fluorescent tubes or LED drivers, which draw a sharp surge each time they are switched on. A switch marked only 10A has been rated on a gentler load.

So the X is about the kind of load, not the size of the current. A 10AX and a 10A switch carry the same running current; the X tells you the contacts are built for the switch-on surge that lighting circuits produce. That is why most modular light switches today are sold as 10AX.

We print AX ratings on our KEMPS modular switches: 10AX for lights and fans, 20AX for heavier loads and 32AX on the double pole switch. This guide explains each figure, what 16AX means, how to read the marking, and what each rating costs in our range. For the full ladder of switch and socket ratings, see our switch and socket ratings chart.

What does the X in 10AX mean?

The X in 10AX means the switch has been rated for lamp loads, such as fluorescent tubes and electronic LED drivers, at the full 10 amp figure, so it can switch those circuits on and off repeatedly without the contacts pitting or welding from the surge that flows at the moment the light comes on.

Switch standards in the IEC 60669-1 family, which Indian standards follow closely, mark this with the letter X after the current. Common practice reads the marking like this:

10A: resistive loads 10AX: resistive and lamp loads 10(2)A: lamp load only 2A

The bracketed style is less common in India, but you will see it on some imported fittings. It means the switch carries 10A on a heater but only the smaller figure on lighting. An AX switch has no such split: the number printed is the number for lights too.

10AX vs 10A switch: what is the difference?

The difference between a 10AX and a 10A switch is the load each is rated to switch: both carry 10 amps continuously, but the 10AX is also rated for the high switch-on surge of tube lights and LED drivers, while a plain 10A rating covers resistive loads such as heaters and filament lamps.

In a home, the practical gap is small for a single bulb and grows with the number of lights on one switch. A switch that turns on a whole row of LED panels or tube lights sees one combined surge every time. That is the job a 10AX switch is rated for.

Price is rarely the reason to choose a plain 10A switch. Our KEMPS Peony K101 10AX 1 way switch is ₹65 MRP; the VIZA V101 10A 1 way piano switch is ₹56. Both are sound switches for an ordinary room light. Where one switch drives several drivers or tubes, we suggest the AX rating. Our KEMPS Peony K101 page shows the switch.

Why do LED lights and tube lights need an AX switch?

LED lights and tube lights benefit from an AX switch because their electronic drivers and ballasts contain capacitors that charge in the first instant after switch-on, drawing a brief current many times their running current, and that surge is what wears the contacts of a switch not rated for lamp loads.

The surge lasts a fraction of a second, so it does not trip an MCB or heat the wire. It does, however, land on the switch contacts at the exact moment they close. Over thousands of operations, a switch not built for it can show pitted contacts, a crackling click or, in the worst case, contacts that stick.

One LED bulb draws a small surge. Six panels or a long run of LED tube lights on one switch add up. That is where the AX rating earns its place.

A dimmer or fan regulator is a different device with its own rating in watts; it is not chosen by AX. For flicker on a correctly switched LED, see why an LED light flickers.

What does 16AX mean on a switch?

16AX on a switch means it carries 16 amps and is rated to switch lamp loads at that full 16 amp figure, which makes it a heavier switch for a large lighting circuit, a geyser or another appliance drawing up to 16 amps, and a common rating on modular ranges that pair it with a 16A socket.

Our catalogue does not list a 16AX switch. Our ratings step from 10AX to 20AX on KEMPS, and our 16 amp switch is the VIYONA 151, a 16A 1 way switch carrying the ISI mark, at ₹74 MRP, with the VIYONA 152 16A 2 way switch at ₹90.

If a plan calls for 16AX, a 20AX switch meets it: it carries more current and has the same lamp-load rating. The rule is that the switch rating must be equal to or above the load and the socket it controls, never below. A switch for a 16A socket must be at least 16 amps. Our 16A vs 20A switch guide compares the two sizes in detail.

What does 20AX mean, and where is a 20AX switch used?

20AX means a switch carries 20 amps and is rated to switch lamp loads at that figure, and it is commonly used for heavier single points such as a geyser, a 16A power socket, a large lighting circuit or a pump, where a 10AX switch would be working too close to its limit.

Our KEMPS range carries 20AX in every series. In Peony the K106 20AX 1 way switch is ₹107 MRP, the K107 20AX 2 way ₹132, and the K108 20AX 1 way with indicator ₹120. There is also a 2 module version, the K111 20AX 1 way switch, at ₹156.

Typical places for a 20AX switch:

Geyser 16A power socket Pump or motor point Large lighting circuit

For an AC or a geyser, common practice is a 32A DP switch that breaks phase and neutral together. Our geyser switch guide covers that choice, so we only flag it here.

Is 32AX the same as a 32A DP switch?

A 32AX switch and a 32A DP switch describe two different things, the rating and the number of poles, so one switch can be both: our KEMPS K116 is a 32AX DP switch with indicator, meaning it carries 32 amps, is rated for lamp loads at 32 amps, and breaks phase and neutral together.

The AX part describes the load the contacts are rated for. The DP part, double pole, describes how many wires it breaks. A DP switch is the common choice for an AC or geyser, because switching both wires leaves the appliance fully disconnected.

In our range, KEMPS K116 32AX DP with indicator is ₹360 MRP in white; the grey line K516 is ₹392. VIZA prints its DP switches as 32A, for example the VIZA V1250 32A DP switch with indicator at ₹330.

What a DP switch is, and when you need one, is covered in full in our DP switch guide.

Which AX ratings do we make, and what do they cost?

We make AX-rated modular switches in 10AX, 20AX and 32AX across our KEMPS series, from the Peony K101 10AX 1 way switch at ₹65 MRP to the K116 32AX DP switch with indicator at ₹360, with 2 way, bell push, indicator and 2 module versions in between.

The jump that matters is from 20AX to 32AX DP: the DP switch has two sets of contacts and an indicator, so it costs about three times a 20AX 1 way. Between 10AX and 20AX the gap is ₹42 on a 1 way switch. The same ratings run through KEMPS switches and sockets in Daisy, Orchid and Vinca.

Does an AX switch cost more?

An AX switch costs little or nothing more than a plain amp-rated switch of the same size in our range, because what you pay for is mostly the series and finish: a 10AX 1 way switch is ₹65 to ₹68 across KEMPS series, against ₹56 for the VIZA 10A piano switch and ₹22 for a VIYONA 6A switch.

Under ₹10 separates the VIZA 10A piano switch from a KEMPS 10AX in this chart. The bigger choice is modular or conventional; our modular vs normal switch guide covers that.

How do you read the rating on a switch?

To read the rating on a switch, look at the back or side of the module, where the current is printed with its letter, such as 10AX or 20A, next to the voltage, usually 240V or 250V, and the standard and certification mark; the same figure appears against the code in the dealer’s price list.

What to look for on the module:

Current: 10, 16, 20 or 32 Letter: A or AX Voltage: 240V or 250V ISI mark and licence

If the switch is already in the wall, do not prise it out to read it. The plate hides the marking, and taking it off means switching off the MCB first and proving the board dead. Our guide to replacing a switch covers that safely. Most of the time the code on the bill or the box is quicker: our codes such as K101 or K106 map straight to a rating in the catalogue.

A missing mark matters. Our fake ISI mark guide shows what a genuine one looks like.

Which AX rating should you use for each load?

As common practice, use a 10AX switch for lights, fans and small lighting circuits, a 20AX switch for a geyser, a 16A socket, a pump or a heavy lighting run, and a 32A DP switch for an AC or a geyser where both wires should be broken, always choosing a rating at or above the load.

A quick guide:

Room light, fan: 10AX Row of LED panels: 10AX 16A socket: 20AX Geyser: 20AX or 32A DP AC: 32A DP

The switch is only one link. The wire, the socket and the MCB on the same circuit must all suit the load. Our wire size for AC and geyser and MCB for home guides cover those links, and the types of electrical switches page explains 1 way, 2 way, bell push and DP switches.

Common mistakes with AX ratings

The common mistakes with AX ratings are reading the X as a bigger current, fitting a 10AX switch to a 16A socket, using a plain resistive-rated switch for a long run of LED fittings, and assuming a high switch rating protects the circuit, when only the MCB does that.

What we see most often at the counter:

10AX on a 16A socket The switch is below the socket it controls.

20AX everywhere Safe, but you pay more for every light point.

AX read as extra amps A 10AX switch is still 10 amps.

Mixing ratings by looks A board with one 20AX and five 10AX modules is normal; each is matched to its point.

Getting it right costs little: in our range the step from 10AX to 20AX in KEMPS Peony is ₹42. If a switch is already warm or crackling, our hot switch and sparking socket guide explains what to do next.