Schneider Electric LV431630 ComPact NSX250F 250 A Circuit

LV431630 a 250 A ComPact NSX250F thermal-magnetic breaker

The LV431630 is a Schneider Electric product listed in the datasheet as: Circuit breaker, ComPact NSX250F, 36kA/415VAC, TMD trip unit 250A, 3 poles 3d. The ComPact NSX250F is a moulded-case circuit breaker for distribution, with a TM-D thermal-magnetic trip unit rated 250 A. It offers 36 kA breaking capacity at 380/415 V and is suited to main and sub-distribution boards that need a robust and isolating breaker. Seven Star LLC supplies the LV431630 in Oman and the GCC as an independent supplier based in Muscat.

Decoding the reference: LV431630 is the Schneider catalogue number, NSX250F is the frame (250 A) with performance level F at 36 kA, 3 poles protected (3P/3t), and TM-D is the thermal-magnetic trip unit with a 250 A rating. The datasheet shows front connections both above and below.

Technical specifications of the LV431630

Protection data of the LV431630

Network frequency: 50/60 Hz. Rated operational voltage: 690 V AC 50/60 Hz. Utilisation categories: Category A. Trip unit technology: Thermal-magnetic. Breaking capacity: 36 kA 380/415 V AC 50/60 Hz IEC 60947-2; 85 kA 220/240 V AC 50/60 Hz IEC 60947-2; 22 kA 525 V AC 50/60 Hz IEC 60947-2. Mechanical durability: 20000 cycles. Electrical durability: 5000 cycles 690 V In; 10000 cycles 690 V In/2; 10000 cycles 440 V In; 20000 cycles 440 V In/2.

The TM-D trip unit has adjustable long-time protection from 0.7 to 1 times In, with a fixed short-time instantaneous setting adjustable from 5 to 10 times In. That is the standard thermal-magnetic protection: overload with a time delay and short-circuit with fast response, without earth-leakage.

Ratings include 690 V AC operational voltage, 800 V insulation, 8 kV impulse, suitability for isolation, category A and a service breaking capacity of 35 kA at 440 V. Mechanical life is 20000 cycles and the electrical life depends on voltage and current.

Position of the LV431630 in the NSX range

The NSX100-250 frame covers 16 to 250 A. The LV431630 is the top rating in this frame, while the LV430631 listed beside it is the NSX160F with a 125 A trip unit. Both have the same F breaking class but differ in current and mechanical life (40000 cycles for the NSX160 frame against 20000 here).

The NSX range has been replaced by the newer ComPacT NSX in the manufacturer’s catalogue, and the datasheet shows the product discontinued. This makes the LV431630 mostly a replacement for an existing board where the NSX250F is installed.

The datasheet downloaded for this page carries lifecycle notices: Discontinued on: Jun 15, 2023. For a plant that already runs this reference that makes the LV431630 a spare-and-replacement item, and it is worth fixing the stock level and the long-term successor plan at the same time. We can discuss compatible alternatives once we know the installation.

Selection checklist for the LV431630

• Rated current: 250 A at 40 degrees Celsius, thermal-magnetic TM-D.
• Poles: 3 poles all protected.
• Breaking capacity: 36 kA at 415 V, performance F.
• Mounting: fixed, backplate, front connection top and bottom.
• Accessories: check terminal shields, auxiliary contacts and rotary handle that are already installed.
• Cables and busbar: 35 mm connection pitch must match the board.

Installation and maintenance of the LV431630

Mount on a backplate with the connection pitch of 35 mm and tighten the terminals to the torque in the manual. Check the cable cross-section for 250 A and the temperature derating inside the board.

Test the trip function with the proper test equipment rather than by overloading; keep records of the trip settings, and replace the breaker when it has operated several times at maximum fault levels.

Typical applications of the LV431630 in Oman and the GCC

In Oman and the GCC NSX breakers are installed on main distribution boards in industrial plants, desalination units and commercial buildings. Heat inside boards demands attention to derating, and dust accumulates at terminals, so periodic thermographic checks are useful.

Dimensions, environment and approvals of the LV431630

For the LV431630, plan the mounting space from the datasheet: 105 mm (W) x 161 mm (H) x 86 mm (D). The LV431630 weighs 2.4 kg. Mounting, derating and enclosure choices follow the environmental data below, which should be compared with the actual panel temperature and the dust and humidity of the site in Oman and the GCC.

Ambient temperature limits in the datasheet: -50 to 85 °C. Relative humidity: 0 to 95 %. Ingress protection: IP40 conforming to IEC 60529. Operating altitude: 0 to 2000 m without derating; 2000 m–5000 m with derating. Standards listed: EN/IEC 60947. Certifications listed for this reference: CCC; Marine; EAC.

Information to send with an RFQ for the LV431630

• Full reference and quantity required
• Existing equipment, panel or rack it must fit
• Supply voltage, load or signal details of the application
• Required delivery location and timing
• Whether a spare, a replacement or a new installation

Documents and quotation

A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above.

Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and does not represent itself as an official channel of the manufacturer.