Schneider Electric C40H32D400 ComPacT NSX400H 3P ML 2.3 400A

C40H32D400: ComPacT NSX400H 3P breaker with MicroLogic 2.3

The C40H32D400 is a ComPacT NSX400H three-pole (3D, all three poles protected) circuit breaker, fixed mounting, rated 400 A, supplied complete with a MicroLogic 2.3 trip unit. The datasheet gives the H 70 kA 415 V AC breaking code and a rated operational voltage of 690 V AC 50/60 Hz. Seven Star LLC supplies the C40H32D400 in Oman and the GCC as an independent supplier based in Muscat.

Reading the reference: across the references in this group the datasheet titles show that the leading characters follow the frame size, the letter H matches the H performance level (70 kA at 415 V AC), and the trip unit and rating are named in the title as MicroLogic 2.3 at 400 A. The datasheets do not publish a full decoding table, so confirm any other option with the ordering documents.

Site conditions and use of the C40H32D400 in Oman and the GCC

Distribution feeders: the datasheet lists the application as distribution, which suits incomers and outgoing feeders in low-voltage boards.

The datasheet lists -25 to 70 °C for operation, relative humidity of 0 to 95 %, protection IP40 conforming to IEC 60529 and IK07 conforming to IEC 62262, pollution degree 3 conforming to IEC 60664-1, and altitude 0 to 2000 m without derating, 2000 m to 5000 m with derating. In Oman the practical limits are the temperature inside the switchboard in summer and the dust and salt-laden humidity on the coast.

Typical places are substations, desalination and water plants, oil and gas facilities, and industrial or commercial buildings. A panel builder should check derating at the board temperature, not only the datasheet rating at the reference temperature.

Trip unit and settings of the C40H32D400

The trip unit is the MicroLogic 2.3, an electronic unit whose datasheet protection code is LSoI: long-time overload protection, short-time protection with a fixed delay, and instantaneous protection. The long-time pick-up Ir has nine settings between 160 to 400 A. The delay is fixed and is listed as 400 s at 1.5 x Ir; 16 s at 6 x Ir; 11 s at 7.2 x Ir.

Short-time pick-up Isd is adjustable in nine steps over 1.5 to 10 x Ir with a fixed delay. The instantaneous threshold is fixed at 4800 A, so it does not move when Ir is changed. Thermal memory is 20 minutes before and after tripping before and after tripping, which matters on feeders that restart soon after a trip.

The trip unit is part of this reference, so no separate trip unit order is needed.

C40H32D400 technical specifications

Breaking capacity of the C40H32D400 at the voltages that matter

The breaking capacity code on the datasheet reads H 70 kA 415 V AC. The H code carries 70 kA Icu at 380/415 V AC, the highest figure in this group of datasheets. At 660/690 V AC the Icu is 20 kA, and the service capacity Ics at 380/415 V AC is 70 kA.

Insulation voltage is 800 V AC 50/60 Hz and the impulse withstand is 8 kV.

ComPacT NSX400 and NSX630 references around the C40H32D400

The table lists the references of the same frame size covered by this set of datasheets, so you can see where the C40H32D400 sits among the frames, pole counts and trip units. Similar references differ in frame performance level, pole count or trip unit, not in appearance alone.

Selection and RFQ checklist for the C40H32D400

• Rating: 400 A with MicroLogic 2.3, and the load current at the actual board temperature.
• Poles: 3P, and whether the neutral must be switched.
• Fault level: 70 kA Icu at 380/415 V AC against the prospective current.
• Space: 140 mm x 255 mm x 110 mm and 6.05 kg.
• Accessories such as auxiliary contacts, handles and terminal shields are separate references.

For the quotation please send the part number C40H32D400, quantity, system voltage and frequency, prospective fault current, delivery place and required date.

Size, weight and mounting of the C40H32D400

The C40H32D400 is a fixed-mounted breaker for a backplate, with front connections at top and bottom on a 45 mm pitch. The body is 140 mm wide, 255 mm high and 110 mm deep and weighs 6.05 kg.

This is a three-pole version without a neutral pole. For networks with a switched neutral, the four-pole references in the same frame are the alternative.

Power dissipation is 19.2 W per pole, a number to carry into the heat calculation of the enclosure.

Documents and quotation

The manufacturer datasheet for the C40H32D400 is attached on this page. It lists the ratings and dimensions summarised above, so compare it with your single-line diagram and short-circuit study before you order.

Send us the part number, quantity and a few lines about the installation and we will reply with availability and a quotation. Seven Star LLC is an independent supplier in Muscat and is not part of the manufacturer’s own sales network.