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MCBs in Malaysia: how to read the ratings and compare brands

An MCB — miniature circuit breaker — is the small switch on a distribution board that trips when a circuit draws too much current. It protects the cable against overload and short circuit. That’s a different job from residual-current protection, so a board normally has both: the MCB guards the wiring, and an RCCB or RCBO guards against earth-leakage current. An MCB alone doesn’t replace that second device, and “MCB” on its own describes overcurrent protection.

Most of the confusion around these products comes from mixing up what the labels actually describe.

The numbers on the front

You’ll usually see four things printed together on an MCB, and each one is a separate specification.

Poles. One pole (1P) switches a single live conductor; two-pole (2P) versions suit a single-phase supply, and three- and four-pole units handle three-phase circuits. Pole count also sets how much board width the device takes. On the standard modular frames most Malaysian boards use, a 1P device is 18mm wide, 2P is 36mm, 3P is 54mm and 4P is 72mm — but compact and other formats exist, so check the actual device for space planning.

Rated current. This is the continuous current the device is designed to carry — 6A, 16A, 20A, 32A, 63A, and so on. It isn’t a trip point; an MCB carries a modest overload for a while and only opens once current and time together cross its trip characteristic.

Trip curve. The curve letter describes how the device’s magnetic element responds to a sudden current surge. A B curve tolerates less inrush and suits resistive loads, lighting and low-surge domestic appliances. A C curve tolerates more and is used for inductive and commercial loads — motors, fluorescent lighting, small transformers. A D curve tolerates more again, for high-inrush equipment such as large motors or X-ray machines. Schneider’s Acti9 FAQ puts the magnetic trip thresholds at roughly 3–5 times rated current for B, 5–10 times for C and 10–14 times for D, though the exact multiples vary by manufacturer, so read the maker’s own curve data rather than assuming one company’s figures apply everywhere.

Breaking capacity. Written as Icn and quoted in kiloamperes, this is the short-circuit current the device can safely interrupt at a stated voltage. The number to check is the manufacturer’s rated value at your operating voltage. How much the device needs depends on the prospective fault current where it’s installed — that’s higher close to a supply transformer than at the end of a long domestic circuit — not on whether the building is a house or a factory.

One naming trap: the B, C, D letters on an MCB are not the same as the Type A, AC, F, B letters on residual-current devices. They come from different standards and describe different physics, even though both use letters.

Maxguard, a Malaysian range worth knowing

Maxguard is a local low-voltage switchgear brand, and it’s a good example of how these devices are ordered. Two of its MCB families are worth comparing; the Maxguard MCB comparison sets them side by side.

The MB63-1 series is the 6kA range: 1–63A in 1P, 2P, 3P and 4P, with B and C curves. Maxguard’s order codes read as a sequence: M, then the pole count, then the ampere rating, then the curve letter and the breaking capacity. So a 16A single-pole C-curve unit is M116C6 (one pole, 16A, C curve, 6kA), and a 32A single-pole B-curve is M132B6. Higher ratings continue the same way, up to M163C6 for 63A.

The F2 series steps the breaking capacity up to 10kA, keeps the 1–63A span and pole options, and adds a D curve. Its codes carry a trailing 10: M116C10 is the 16A single-pole C-curve, and M140D10 is a 40A single-pole D-curve.

Both families are built to IEC 60898-1, rated 230/400V and 240/415V, with 4kV impulse withstand, IP20, a terminal capacity of 1–25mm² and over 4,000 operating cycles. The full order tables are in the Maxguard catalogue.

There’s a discrepancy worth flagging on Maxguard’s own F2 web page. The page title says 10kA, but the specification table lists “Rated breaking capacity (Icn): 6kA” and only B and C curves — while the product image on that same page shows a device marked D63, and the catalogue order tables list D-curve codes at 10kA. If you’re ordering an F2 device, quote the exact code and check the rating on the label rather than trusting the web table alone.

Schneider’s Easy9 and Acti9 iC60 ranges

Two Schneider lines worth comparing are Easy9 and Acti9 iC60. Easy9 is aimed at homes and small businesses, covering standard short-circuit and cable-overload protection. Acti9 iC60 sits in the Acti9 system range: models up to 63A, several performance steps within the family, and a wider curve selection for particular duties. The extra configurability is what distinguishes iC60 — whether a given job needs it is a question for the person designing that circuit, not a rule you can apply from the name alone. The Easy9 MCB and iC60 pages cover the order codes and Malaysian sellers, and the Easy9 and Acti9 overviews compare the two series, including 2021 list prices at the same rating.

Schneider’s own Malaysia selection note asks for five inputs before it will identify a part — number of poles, curve code, ampere rating, breaking capacity and operating voltage. That’s a useful checklist for any brand’s counter, because a model number only lands on the right device when all five are pinned down.

Himel and ABB: a budget brand and a premium one

Electricians in Malaysian wiring groups put Himel in the budget tier with Maxguard, and ABB in the premium tier with Schneider and Hager. Neither has a Malaysian product list online, so our pages build their tables from Malaysian distributor and price-list sources.

  • Himel HDB3wHN and HDB9H: the HDB3wHN is the 6kA range in 1–4 poles from 6A to 63A, and the HDB9H the 10kA range in 1–3 poles. Every Himel code in Desea’s list and KVC’s catalogue is a C curve. Read HDB3wHN1C16 as 1-pole, C curve, 16A. Shops also sell a cheaper HDB6s.
  • ABB SH200 and SH200L: ABB’s residential “Compact Home” line, at 6kA (SH200) or 4.5kA (SH200L). Read SH201-C16 as 1-pole, C curve, 16A at 6kA; SH201L-C16 is the 4.5kA version. The ABB text Malaysian sellers quote says SH200 goes “up to 40 A”, while the KVC catalogue lists 50A and 63A codes too, so confirm those ratings.

On price, the two meet in the middle. In October 2026, a single-pole ABB SH201 at 6kA was about RM9–13 (6–40A) at Malaysian shops and an SH201L at 4.5kA RM8.50–10, while a Himel HDB3wHN single pole was RM5.81–10.37 at one Selangor store. Both brands’ MCBs are on JKR’s eMAL approved list, recorded as made in China.

Ordering the right device

Order by the full code. “16 amp MCB” could be B, C or D curve, one pole or several — M116C6, M116C10, HDB3wHN1C16, SH201-C16 and a Schneider iC60 part number each name exactly one device. An exact listing, whether it’s on a brand’s own page or a marketplace, tells you which model is being offered; whether a particular branch has it on the shelf today is a separate question.

On the supply side, Maxguard publishes its codes on its own MB63-1 and F2 pages and supplies through electrical wholesalers. Schneider sells Easy9 and Acti9 through its distributor network, which in Johor Bahru includes Maydenki, Synoview Electric and Genuine Electric. Himel is supplied in Malaysia by Desea Sdn Bhd and ABB by ABB Malaysia Sdn Bhd; both reach buyers through distributors such as KVC and through electrical shops, which the Himel and ABB brand pages list.

Matching an MCB to the circuit

You can’t size an MCB from a description of the load alone. The rated current has to co-ordinate with the cable’s current-carrying capacity and with the device upstream, and the breaking capacity has to suit the prospective fault current at that point in the installation. In Malaysia that’s a design decision for a competent person working to the current Suruhanjaya Tenaga domestic wiring guide.

Some loads change the choice. Circuits feeding variable-speed drives, inverters and similar electronics produce residual currents that a plain MCB never sees but that affect co-ordination with the residual device upstream. A surge protective device gets its own protection too: in the Energy Commission’s example layouts it’s fed through its own MCB or fuse. EV chargers and solar inverters usually carry their own manufacturer requirements, so whether a circuit needs a particular curve or residual type is an equipment-specific question — the answer for one model doesn’t transfer to the next.

The model number alone doesn’t tell you what’s in the box. Check the pole count, the ampere rating and the curve letter on the device or listing; a “16A MCB” could be any of three curves. And if the specification mentions Type A, that’s an RCD classification, not an MCB one — you’re probably looking at a different product than you think.

Ranges across brands

Models

Maxguard M116C10

Maxguard M116C10 is a 1-pole, 16A C-curve miniature circuit breaker rated 10kA Icn.

Function
MCB
Poles
1P
Rated current
16A
Sources

Maxguard M116C6

Maxguard M116C6 is a 1-pole, 16A C-curve miniature circuit breaker rated 6kA Icn.

Function
MCB
Poles
1P
Rated current
16A
Read about M116C6 →
Sources

Maxguard M140D10

Maxguard M140D10 is a 1-pole, 40A D-curve miniature circuit breaker rated 10kA Icn.

Function
MCB
Poles
1P
Rated current
40A
Sources

Suppliers in this directory

Suppliers and locations

1 suppliers

  • IMS Motionet Sdn Bhd

    Industrial automation company and Schneider Electric authorised distributor based in Simpang Ampat, Penang. Distributes electrical control and motion components from Schneider, Delta, Kollmorgen, Sanyo Denki and others, and builds its own automation systems including smart screwing, intelligent maglev transfer, robotics/AMR and machine vision.

    59, Jalan Hijauan Hills 2, Hijauan Hills, 14200 Simpang Ampat, Pulau Pinang

    Call +604-286 3380 · Directions

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