Short answer: Grid facts decide the ordering code before price does. Most of Europe, Africa, the Gulf, Russia and the CIS, and the South American cone run 220–240 V at 50 Hz. Saudi Arabia runs 60 Hz with an unsettled 127 V / 230 V legacy. Peru and the Philippines are 220 V but 60 Hz. Mexico, Brazil, Colombia and the United States run 110–127 V at 60 Hz. The breaker itself is usually marked 50/60 Hz — it is the contactor coil, the meter and the surge device that have to be matched to the grid.
This page is the sourcing view of voltage and frequency: which grids exist, which ones break the “just send the usual” assumption, and which parts of an order are frequency-sensitive. It is written as an independent trading company — not a manufacturer, and not an appointed distributor of any brand — and every device is quoted for the grid you actually have.
Two numbers decide the code
Voltage and frequency are the first two fields of any breaker enquiry, and they are not a formality. Voltage sets the device’s operating rating and, more sharply, the surge-protection selection, because a surge device is chosen by system-to-earth voltage — a 127 V system and a 230 V system need different values. Frequency sets everything with a coil, a clock or a measuring element: contactors, relays, digital meters. Get the voltage right and the frequency wrong and a panel can still fail on commissioning.
Region by region
Most of the map is one block. The exceptions are where orders go wrong.
| Region | Typical grid | Note for the order |
|---|---|---|
| Gulf (UAE, Qatar, Kuwait, Oman, Bahrain) | 230–240 V / 50 Hz | IEC ecosystem; standard 50 Hz selection |
| Russia and the CIS | 220–230 V / 50 Hz | Single EAC route across the customs union |
| Sub-Saharan Africa | 220–240 V / 50 Hz | Standard 50 Hz selection |
| South America cone (AR, CL, PY, UY, BO) | 220–230 V / 50 Hz | Standard 50 Hz selection |
| South and Southeast Asia | 220–240 V / 50 Hz | Voltage and frequency standard; local schemes vary |
| Saudi Arabia | 127 V and 230/400 V (migrating) / 60 Hz | Frequency exception plus a split voltage |
| Peru and the Philippines | 220 V / 60 Hz | Voltage standard, frequency not |
| Mexico, Brazil, Colombia, United States | 110–127 V / 60 Hz | Different device selection, not just a different coil |
The single most useful habit is to stop treating “220 V” and “50 Hz” as one fact. They are two, and the second is the one buyers forget. North-eastern Brazil, Mexico, Colombia and the United States are voltage exceptions; Saudi Arabia, Peru and the Philippines are frequency exceptions; Saudi Arabia is both.
The 60 Hz markets that look like 50 Hz ones
These are the traps, because the voltage looks familiar and the frequency is quietly different.
| Market | Voltage | Frequency | What changes |
|---|---|---|---|
| Saudi Arabia | 127 V and 230/400 V | 60 Hz | Coil ordered for 60 Hz; SPD chosen by the actual system-to-earth voltage, which differs between the 127 V and 230 V systems |
| Peru | 220 V | 60 Hz | Coil and meter for 60 Hz; breaker unchanged |
| Philippines | 220 V | 60 Hz | Coil and meter for 60 Hz; and check whether the site is on the 110/115 V residential line |
What actually cares about frequency
Not every device in the panel is frequency-sensitive, and knowing which are saves a re-quote.
| Component | Frequency sensitivity | Rule |
|---|---|---|
| MCB | Low | Devices are generally rated 50 Hz or 50/60 Hz — confirm the rated voltage covers the grid |
| RCCB / RCBO | Low | AC-type operation is frequency-independent; check the trip sensitivity and type for the destination |
| MCCB, thermal-magnetic | Low to medium | Thermal tripping is essentially frequency-independent; select by breaking capacity and the actual load |
| Contactor coil | High | The coil impedance changes with frequency; a coil wound for 50 Hz used on 60 Hz can lose pull-in and chatter, and a 60 Hz coil on 50 Hz can overheat. Order the coil for the destination grid |
| Thermal overload relay | Medium | The bimetal is largely unaffected; the contactor it sits on must be the same frequency |
| SPD (surge protection) | Medium | Uc is set by system-to-earth voltage, so a 127 V and a 230 V system need different selections — this is more decisive than the frequency |
| Energy meter and panel meter | High | Confirm the meter is rated for the destination frequency; a 50 Hz meter on a 60 Hz grid can drift and trigger a claim |
| Enclosure | None | Ways and busbar only; the grid does not change the box |
The practical rule: breakers are almost always the easy part, and coils and meters are where the losses hide. If a panel order includes a contactor, the coil specification has to carry both the control voltage and the frequency. For the mechanics of that, see contactor coil voltage at 50 Hz versus 60 Hz.
The 110–127 V question: selection, not exclusion
A 110–127 V / 60 Hz market is not a market we decline — it is a market that needs a different selection. The device’s rated voltage has to cover the lower grid, the contactor coil has to be the 60 Hz winding, the meter has to be rated for the frequency, and surge protection has to be chosen for a lower system-to-earth voltage. Certification also changes, because most 110–127 V markets run their own schemes rather than accepting IEC documents alone.
That is a specification problem, not a wall. What we do not do is send a 230 V / 50 Hz selection, ship it, and hope. The 110–127 V selection guide covers the device choices; the SPD and ATS range covers the parts that are most sensitive to the voltage split.
The four questions to send
Four fields, every time: voltage (127, 220 or 230), frequency (50 or 60 Hz), single or three phase, and destination country. Add the contactor control voltage where contactors are involved. A quotation that starts from these four is a quotation that can be installed; one that starts from “we use 220 V” is a guess with a price on it.
FAQ
Q: Does the grid voltage change which breaker I need?
A: It changes the rated voltage the device has to cover, and it changes surge-protection selection more sharply, because an SPD is chosen by system-to-earth voltage. For the breaker itself, confirm the rated voltage covers the grid you have.
Q: Is 60 Hz a problem for circuit breakers?
A: For the breaker, no — it is normally rated 50/60 Hz. For anything with a coil or a measuring element, yes. A 50 Hz contactor coil used on 60 Hz can chatter or fail to latch, and a meter rated for 50 Hz can drift. Order those parts for the destination frequency.
Q: Which countries are 60 Hz?
A: Among the markets you are most likely to meet: Saudi Arabia, Peru and the Philippines run 60 Hz, plus the 110–127 V group of Mexico, Brazil, Colombia and the United States. Most of Africa, the Gulf, Russia and the CIS, and the South American cone run 50 Hz.
Q: My country is 220 V but 60 Hz. What do I order?
A: The breaker selection follows the voltage, so a standard device usually works; the coil, the meter and any frequency-dependent accessory follow the frequency, so those are ordered for 60 Hz. State both numbers on the enquiry and the code is fixed without a guess.
Q: Is lower voltage always a different product?
A: Not the breaker brand, but often the rating and always the surge selection. On a 127 V system the surge device is chosen for a lower system-to-earth voltage, and the meter and coil are frequency-matched. It is a configuration change, not a different catalogue.
Q: Why ask for the destination country if I already gave the voltage?
A: Because the destination decides the certificate and the buyer’s local holder, and it is where a voltage assumption most often breaks down — a grid may be migrating, or have a legacy voltage still in service. Voltage plus country plus frequency is the shortest path to a code you can install.
What to send us for a quotation
Model or code · quantity · destination country and port · voltage · frequency · single or three phase · contactor control voltage if applicable. You get unit price, packing data and the certificate document for the exact ordering code. Request a quotation.
Related: Miniature circuit breakers · Contactors · Saudi Arabia market · South America market · 230 V breakers in 110–127 V markets · Contactor coil voltage 50 Hz vs 60 Hz