Schneider Electric 33484 ComPact NS1600N 1600 A 4P Breaker

33484: 1600 A ComPact NS1600N 4-pole breaker, MicroLogic 2.0

Schneider Electric lists the 33484 as a molded-case circuit breaker from the ComPact NS630b…1600 range, 1600 A at 50 °C, 4 poles, with a MicroLogic 2.0 electronic trip unit. Seven Star LLC supplies it in Oman and the GCC as an independent supplier based in Muscat.

The device short name in the datasheet is Compact NS1600N. In this naming the digits give the frame current class, and the letter N is the breaking-capacity level: the datasheet’s performance level reads N 50 kA at 415 V AC. The trip unit is MicroLogic 2.0, an LI electronic unit, and the device has 4 protected poles (4D), with the neutral pole on the left.

Please note that the datasheet carries a discontinued notice dated 30 Sep 2024. Seven Star LLC can still quote the 33484 where stock or alternatives exist, but availability should be confirmed before it is specified for a new project; for a like-for-like replacement we need the full nameplate of the breaker being replaced.

Technical specifications of the 33484

MicroLogic 2.0 protection on the 33484

The MicroLogic 2.0 is a basic electronic trip unit. The datasheet gives two protection functions only: L for long-time overload protection and I for instantaneous short-circuit protection. There is no short-time (S) stage, so selectivity with a downstream breaker depends on how the instantaneous threshold sits relative to the downstream device rather than on an adjustable delay.

The long-time pick-up Ir is adjustable in 9 settings from 0.4 to 1 x In. With In of 1600 A on this 33484, that spans 640 A to 1600 A (calculated from the datasheet range). 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 and 0.7 to 16.6 s at 7.2 x Ir. A thermal memory of 20 minutes is stated.

Instantaneous pick-up Ii is adjustable from 1.5 to 10 x Ir. Setting Ir to 1600 A therefore puts the top end of the instantaneous range at 16,000 A, calculated.

Short-circuit ratings of the 33484

The datasheet lists the following ratings, conforming to IEC 60947-2. Icu is the ultimate breaking capacity; Ics is the rated service breaking capacity.

For the 1600 A frame the service breaking capacity Ics is lower than Icu: 37 kA at 380/415 V against 50 kA Icu, so the Ics/Icu ratio is not 100 %.

Icw is 19.2 kA for 1 s; utilisation category B.

Sizing the 33484: load, pole count and dissipation

At 415 V a three-phase load of 1600 A corresponds to roughly 1,150 kVA (calculated as √3 x 415 V x 1600 A; not a datasheet value). The datasheet gives the rated current as 1600 A at 50 °C, with the device operating in ambient temperatures up to 70 °C, so in a hot switchroom the loading of the 33484 should be checked against the manufacturer’s derating information rather than assumed to be 1600 A.

The 33484 is the four-pole version: 280 mm wide and 18 kg, against 210 mm and 14 kg for the three-pole reference of the same rating. The neutral is on the left. The datasheet lists neutral protection settings of no protection (3D), 0.5 x Ir (3D + N/2) and 1 x Ir (4D), so the neutral can be left unprotected, set to half the phase pick-up or set equal to it. Four-pole breakers are chosen for TN-S systems with significant third-harmonic or unbalanced single-phase load, and where the neutral must be switched by the same device.

The datasheet states power losses of 74 W for this device. That heat stays inside the enclosure, so when several breakers sit in one cubicle their dissipation is added to the busbar and cable losses when the cooling or ventilation is sized.

Where this breaker sits in the ComPact NS range

Seven Star LLC also handles other ComPact NS references. Check poles, trip unit and breaking-capacity level before substituting any of them for the 33484.

33482 is NS1600N with 3 poles instead of 4. 33483 is NS1600H with 3 poles instead of 4, level H instead of N.

Accessories such as release coils, rotary handles and motor mechanisms are separate part numbers; send them with the breaker reference for a complete quotation.

Commissioning, operation and maintenance of the 33484

Commissioning of the 33484 starts with mechanical checks (backplate fixing, terminal tightening, handle or toggle operation) and ends with setting the trip unit. Use the settings from the protection study; do not leave the dials at factory positions unless the study says so.

The trip unit has 4 red LEDs for fault indication and 1 yellow LED for overload, a first diagnosis after a trip. Electrical durability is 1000 cycles at 690 V In; 2000 at 690 V In/2; 2000 at 440 V In; 5000 at 440 V In/2; use it when planning inspection intervals.

With IP40 and IK07 protection and pollution degree 3, the 33484 belongs inside an enclosed switchboard; the stated humidity limit is 0 to 95 %.

Typical applications in Gulf industry and utilities

A 1600 A rating is used on the larger incomers and bus-section positions: the LV side of a 1000 kVA class transformer, central chiller plants, compressor houses and the main board of an industrial building. Typical sites include oil and gas camps, utilities, petrochemical plants and desalination units. The MicroLogic 2.0 gives plain overload and short-circuit protection, which fits feeders where no time-selectivity with a downstream device is needed.

Information to send with an RFQ for the 33484

To quote quickly and correctly, please send:

• Reference 33484 and quantity; also state whether a replacement for an existing device is intended, since the datasheet shows it as discontinued.
• Poles needed (4) and, for a four-pole device, the neutral protection setting expected.
• System voltage, available fault level at the board and the intended Icu level (N).
• Trip unit required (MicroLogic 2.0) and whether the settings will be supplied by the protection study.
• Control type (toggle or rotary handle) and any accessories required.
• Delivery location in Oman or the GCC, required documents and target date.

Documents and quotation

The official English datasheet for the 33484 is attached on this page. It lists the electrical data, trip-unit settings, dimensions and environmental information used above, and carries the discontinued notice mentioned earlier.

To request a quotation, send the part number 33484, the quantity and the delivery location. Seven Star LLC is an independent supplier in Muscat and quotes according to current availability.