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250A three pole moulded case circuit breaker
Alfanar

Moulded Case Circuit Breaker, 3 Pole, 250A

In Stock GULF MEP Ref.: ELE-0024 Unit: pcs MOQ: 1

Three-pole 250A moulded case circuit breaker for high-current low-voltage power distribution. Designed for electrical panel applications. Suitable for commercial and industrial installations

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Availability

  • Riyadh · Saudi Arabia
  • Dubai · United Arab Emirates
  • Doha · Qatar
  • Kuwait City · Kuwait

Description

High-current MCCB intended for circuit protection and isolation within low-voltage power distribution systems. Its moulded case construction is suitable for panel-based electrical systems

Applications

  • Main distribution panels
  • industrial facilities
  • commercial buildings and power distribution systems

Specifications

Product type MCCB
Poles 3P
Rated current 250A

Available on request: Breaking capacity, Voltage, Trip unit, Mounting. Tell us the configuration you need and we will confirm these in writing: Get Quote

Choosing and specifying this item

The fault level drives this selection

A 250 A three-pole device usually sits close to the transformer or inside the main low-voltage panel, where the prospective short-circuit current is at its highest. Get that figure from the transformer schedule or the utility, then settle two separate numbers with your supplier: the ultimate breaking capacity, and the service breaking capacity — the level after which the device is still expected to return to duty. Specifications that name only one of them tend to cause arguments at panel review.

Then the trip unit

At this frame size an electronic unit with adjustable long-time, short-time and instantaneous stages becomes the practical way to hold discrimination against the smaller feeders below. Confirm what is being offered, and whether any earth-fault stage is built in, since three poles provide none on their own.

Physical and thermal reality

Current at this level means large single conductors or two cables per phase, so confirm lug capacity, terminal spread, phase barriers and the bending space the panel must allow. Heat matters just as much: ask for the derating table against the enclosure's internal temperature, which in an unconditioned Gulf switchroom can be far above ambient, and fix the mounting method — fixed, plug-in or withdrawable — before the panel is drawn.

Compare the rest of the range in Moulded Case Circuit Breakers, Electrical. Related reading: Distribution Boards: Specifying for the Environment, Not Just the Load.

Frequently asked questions

What is the difference between ultimate and service breaking capacity, and which should I specify?
Ultimate breaking capacity is the highest fault current the device can interrupt, after which it may not be fit for further service. Service breaking capacity is the level it can interrupt and still continue in normal duty. For a main or submain position where restoring supply quickly matters, many specifications call for the service figure to equal a stated proportion of the ultimate one. Give us the required values with the fault level so the offer can be checked against them.

Can a 250 A device be set down to protect a smaller feeder?
Often yes, if the trip unit is adjustable, and it is a common way to standardise on one frame across a board. But the adjustment band has a lower limit, and the short-circuit withstand of the downstream cable still has to be verified against the let-through energy. Ask for the setting range and the time-current curve rather than assuming the device can be turned down to any value you like.

What termination details do you need before quoting?
Tell us the conductor size and material, how many cables per phase, and whether the connection is by cable lug, busbar or an extended terminal kit. Also state whether the panel needs front, rear or side access, and whether terminal shrouds, phase barriers or spreader terminals are required. These affect which accessory kits go with the breaker, and they are far cheaper to include now than to modify once the panel is built.

Does the rating need derating in a hot switchroom?
Yes, and the temperature that matters is inside the enclosure, not outdoors. Devices are calibrated to a reference ambient, and above it the current the thermal element permits falls, while the packing density of breakers and busbars in a panel raises the internal temperature further. Ask for the manufacturer's derating table for the installed temperature and, where the room is unconditioned, involve the panel builder in the heat rise calculation.

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