Schneider Electric 33480 ComPact NS1250N 4P Micrologic 2.0

33480: ComPact NS1250N 4P breaker with MicroLogic 2.0

The 33480 is a ComPact NS1250N fixed-mounted circuit breaker, four poles with all four protected (4D), rated 1250 A, with a MicroLogic 2.0 electronic trip unit and the datasheet performance level “N 50 kA 415 V AC”. Seven Star LLC supplies the 33480 in Oman and the GCC as an independent supplier based in Muscat.

Reading the name: NS marks the ComPact NS630b to 1600 range, 1250 is the rating in amperes at 50 °C, and the letter N is the performance level. The N performance level is rated 50 kA at 415 V AC according to the datasheet, with 30 kA Icu at 660/690 V.

Status note: the datasheet for the 33480 marks it as discontinued on 30 Sep 2024. It is therefore mainly relevant to maintenance, spares and like-for-like replacement of an existing installation. If you are designing a new board, ask us which current reference applies to the same duty and we will check the manufacturer documents before quoting, instead of assuming that a sibling is a drop-in.

Information to send with an RFQ for the 33480

Because the item is discontinued, please include:

• Part number 33480 and quantity.
• Nameplate photograph of the existing breaker, if replacing one.
• System voltage, frequency and prospective fault current.
• Trip unit settings in use and any accessories fitted.
• Delivery location and the date by which you need the breaker.

Size, weight and mounting of the 33480

The 33480 is a fixed breaker for mounting on a backplate, with front connections at the top and bottom on a 70 mm pitch. The body measures 280 mm wide, 327 mm high and 147 mm deep and weighs 18 kg. Power losses are listed as 44 W, a figure to include in the heat balance of the enclosure.

As a four-pole device it is 280 mm wide against 210 mm for the three-pole frames in this group, and it weighs 18 kg against 14 kg. The neutral position is left, and the neutral protection setting can be none (3D), 0.5 x Ir (3D + N/2) or 1 x Ir (4D).

33480 technical specifications

ComPact NS comparison table around the 33480

The twelve references in this group of datasheets cover the 800, 1000, 1250 and 1600 A ratings in N and H performance levels, in three and four poles. Every row below carries a discontinued flag on its datasheet.

Site conditions for the 33480 in Oman and the GCC

The datasheet lists an operating ambient of -25 to 70 °C, relative humidity of 0 to 95 %, IP40 with IK07 and pollution degree 3 conforming to IEC 60947. The operating altitude is 0 to 2000 m without derating; 2000 m to 5000 m with derating.

In Oman these breakers sit in main low-voltage switchboards at substations, desalination and water plants, industrial power houses and large buildings. Summer heat inside the switchboard, dust and coastal humidity are the usual risks, so compare the room temperature with the figures above.

Discontinued status and replacement planning for the 33480

Discontinued does not stop installed 33480 units from working, and the datasheet figures stay valid for them; what changes is availability. For a like-for-like swap, match the rated current of 1250 A, the poles (4P), the breaking capacity (50 kA at 380/415 V), the trip unit type and the size of 280 mm x 327 mm x 147 mm with its 70 mm connection pitch. Send us a nameplate photograph and we will compare it against the datasheet.

Breaking capacity and ratings of the 33480

The full Icu and Ics lists are in the table above; the figure to carry into a fault study is 50 kA Icu at 380/415 V AC, with 30 kA at 660/690 V AC.

Short-time withstand current Icw is 19.2 kA 1 s conforming to IEC 60947-2, the insulation voltage is 800 V AC 50/60 Hz conforming to IEC 60947-2 and the impulse withstand is 8 kV conforming to IEC 60947-2.

Trip unit and settings of the 33480

This version carries the MicroLogic 2.0 trip unit, which gives long-time and instantaneous protection (LI) only; there is no short-time stage and the datasheet lists zone selective interlocking as Without.

With In = 1250 A the long-time pick-up can be set from about 500 A (0.4 x In) to 1250 A. The instantaneous pick-up is 1.5 to 10 x Ir, so with Ir at its maximum the top setting works out to about 12500 A; at a lower Ir the instantaneous threshold falls in proportion.

The long-time delay tr is listed as 12.5 to 600 s at 1.5 x Ir; 0.5 to 24 s at 6 x Ir; 0.7 to 16.6 s at 7.2 x Ir and the thermal memory is 20 mn. These figures matter for coordination with upstream and downstream devices, so request a coordination study if the 33480 will sit between a transformer and several outgoing feeders.

Documents and quotation

The manufacturer datasheet for this reference 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.