Sourced and supplied across Saudi Arabia
A breaker is defined by two numbers and a curve, and enquiries that give only the current rating cannot be answered. The first number is the rated current, which is what the load draws. The second is the breaking capacity at the point of installation — the prospective fault current the device must interrupt without failing — and IEC 60947-2 separates the ultimate capacity Icu from the service capacity Ics, which is what the breaker can clear and still be fit to close again. A device chosen on Icu alone may be a replacement item after one fault. The curve is the third: type B, C and D trip characteristics under IEC 60898-1 exist so that a motor circuit does not trip on its own starting inrush while a lighting circuit still clears quickly. Then say what it must discriminate against upstream and downstream, because selectivity is designed across the set, not chosen device by device.
The more of this you send, the closer the first quotation lands.
| Breaker type | MCB, MCCB, ACB, or VCB for medium voltage |
|---|---|
| Rated current | In amperes, at the ambient inside the enclosure |
| System voltage | Rated operational voltage, at 60 Hz for the Saudi system |
| Breaking capacity | Prospective fault current at the point of installation — Icu and Ics |
| Trip curve | B, C or D for MCBs; adjustable trip unit settings for MCCB and ACB |
| Poles | Single, two, three or four pole, and whether the neutral is switched |
| Discrimination | The upstream and downstream devices it must coordinate with |
| Earth fault protection | RCD, RCBO or an integral earth fault element |
| Trip unit | Thermal-magnetic or electronic, and any metering or comms required |
| Mounting | DIN rail, fixed, plug-in or withdrawable |
| Accessories | Shunt trip, undervoltage release, auxiliary and alarm contacts |
| Ambient derating | State the panel internal temperature — ratings are referenced to 40C |
| Quantity | Units per rating, and the board they populate |
Select one and it travels with your enquiry. Not sure? Leave it and describe the application instead.
We source to specification. Send your requirement and we will come back with options, lead time and pricing.