Schneider Electric EZC250F3250 EZC250F 250A 3P MCCB

EZC250F3250: 250 A three-pole Easypact EZC250F breaker

EZC250F3250 identifies an Easypact EZC250F breaker, three-pole, built around a TM-D thermal-magnetic trip unit with fixed settings. Seven Star LLC supplies the EZC250F3250 in Oman and the GCC as an independent supplier based in Muscat.

How to read EZC250F3250: EZC250 is the frame, F marks the lower F breaking class of the 250 A frame, the digit 3 is the number of poles, and 250 is the rated current in amperes. The digits 250 at the end of the reference are the current rating: the datasheet lists [In] as 250 A at 40 °C and the thermal-magnetic trip unit rating as 250 A at 50 °C.

The datasheet title describes the breaker as 3 poles, 3d, and lists the protected poles as 3t, so every phase is protected by the trip unit. There is no neutral pole to switch on this version; if your system needs a switched neutral, look at the four-pole sibling of the same frame.

Where the EZC250F3250 is used in Oman and the GCC

Easypact EZC breakers are aimed at distribution boards. In Oman and across the GCC that means commercial buildings, hotels, villas and compounds, workshops, warehouses and the utilities of small industrial sites, where moulded case breakers protect feeders between a main board and the floor, plant or pump boards. The EZC250F3250 is typically specified for the main incomer of a medium board or a rising-main tap-off, using the full 250 A of the frame.

The datasheet gives an operating range of -25…70 °C and a storage range of -35…85 °C with IP20 protection, so the breaker belongs in an enclosure. Panels in direct sun, uncooled plant rooms and humid coastal sites run hotter than ambient inside, so allow for the internal temperature when you load the breaker close to its rating.

Information to send with an RFQ for the EZC250F3250

A short list of facts lets us confirm the EZC250F3250 quickly and avoid ordering the wrong class or rating.

• Part number EZC250F3250, quantity and required delivery time.
• System voltage, frequency and earthing arrangement.
• Calculated prospective short-circuit current at the board.
• Load current, cable size and number of poles needed.
• Board maker, enclosure type and site ambient temperature.
• Photo of the nameplate if you are replacing an existing breaker.

EZC250F3250 technical specifications

Selection checklist before ordering

The EZC250F3250 is typically specified for the main incomer of a medium board or a rising-main tap-off, using the full 250 A of the frame. Before you order, run through these points.

• Design current and cable: the 250 A trip rating must sit above the design current and below the cable’s current-carrying capacity at site temperature.
• Fault level: compare the Icu at your system voltage (15 kA at 400/415 V AC) with the calculated prospective short-circuit current, and keep the Ics in mind for the duty you expect.
• Number of poles: 3P on this reference. A separate neutral link or a four-pole version is needed where the neutral must be switched.
• Short-circuit trip: the trip unit is a fixed TM-D unit; the datasheet gives no adjustable thresholds for this reference.
• Space: allow 165 mm (H) x 105 mm (W) x 60 mm (D) and a connection pitch of 35 mm.
• Supply type: the datasheet lists AC and DC, with a rated operational voltage of 550 V AC 50/60 Hz / 250 V DC.

Installation, commissioning and maintenance

Backplate mounting with front connections is the only arrangement the datasheet gives for the EZC250F3250, which keeps installation simple but leaves little room to change the arrangement later.

Make the connections to lugs or bars that suit the 35 mm pitch and follow the torque values in the installation sheet. After energising, check the handle and the terminal temperature under load, because a loose connection is the usual cause of a hot spot or nuisance trip.

The trip unit has no setting to adjust, so commissioning is verification. Exercise the handle now and then and inspect the case and terminals; a breaker that has cleared a fault near its Icu should be inspected or replaced. Durability in the datasheet: 10000 cycles mechanical, see datasheet electrical.

Breaking capacity by voltage: Icu and Ics in the datasheet

Breaking capacity is the figure that decides whether a breaker may sit at a given point in the network. Icu is the ultimate breaking capacity, the highest fault current the breaker can interrupt, after which it may no longer be fit for service. Ics is the service breaking capacity, a fraction of Icu that the breaker can interrupt and still carry on working. The datasheet of the EZC250F3250 gives both, by voltage, as follows.

At the usual 400/415 V AC level the EZC250F3250 is listed with an Icu of 15 kA. That is the lower of the three classes in the 250 A frame, which makes it a fit for boards fed from a modest transformer or from a long cable run where fault level has already dropped.

How this breaker compares with its siblings

The table compares the EZC250F3250 with references of the same frame group that Seven Star LLC can quote. These are datasheet values only; other ratings and frames exist.

Within one frame the case dimensions are the same from rating to rating, but a change of class or frame needs a check of the busbar connection and the door cut-out.

Documents and quotation

The manufacturer datasheet for EZC250F3250 is attached on this page, so you can compare the figures quoted here with the original before you commit to a design or a purchase order.

To proceed, send the part number, the quantity and a few lines about the installation and we will reply with availability and a quotation. Seven Star LLC works as an independent supplier in Muscat with no affiliation to the manufacturer.