Schneider Electric C16N32D160 NSX160N 3P 160 A MicroLogic 2.2

C16N32D160 explained: a 160 A three-pole NSX160N with MicroLogic 2.2

The C16N32D160 is a complete Schneider Electric ComPacT NSX160N moulded-case circuit breaker, fitted at the factory with a MicroLogic 2.2 electronic trip unit rated 160 A. The datasheet title is: Circuit breaker ComPacT NSX160N, 50kA at 415VAC, MicroLogic 2.2 trip unit 160A, 3 poles 3d. It is a fixed three-pole breaker for AC distribution at up to 690 V and carries an N breaking-capacity class of 50 kA at 415 V AC. Seven Star LLC supplies the C16N32D160 in Oman and the GCC as an independent supplier in Muscat.

In the reference, C16 points to the NSX160 frame, N to the breaking-capacity class (datasheet code N 50 kA 415 V AC), 3 to three poles, 2D to the MicroLogic 2.2 trip unit with all three poles protected (3D), and 160 to the trip unit rating in amperes. All statements here come from the C16N32D160 datasheet.

Technical specifications of the C16N32D160

Breaking capacity of the C16N32D160 by voltage

The datasheet gives IEC 60947-2 values for each voltage band. The service breaking capacity Ics equals the ultimate breaking capacity Icu at every voltage listed, so no reduction factor has to be applied for the service value. The fault level at the installation point should be compared with the row that matches the real system voltage; in a 400/415 V network the relevant value is 50 kA.

The datasheet also lists values to UL 60947-4-1: 85 kA at 240 V AC, 50 kA at 480 V AC and 10 kA at 600 V AC.

How the MicroLogic 2.2 trip unit protects the C16N32D160

MicroLogic 2.2 is an electronic trip unit with protection functions LSoI: L (long time overload), So (short time short-circuit with fixed delay) and I (instantaneous short-circuit). It has no earth-leakage protection and no zone selective interlocking according to the datasheet. The long-time pick-up Ir is set on a dial with nine positions covering 63 to 160 A. The long-time delay is fixed, with 400 s at 1.5 x Ir, 16 s at 6 x Ir and 11 s at 7.2 x Ir. Thermal memory is 20 minutes before and after tripping, so a breaker that has just cleared an overload does not restart from a cold curve.

The short-time pick-up Isd is adjustable from 1.5 to 10 x Ir in nine settings with a fixed delay, and the instantaneous pick-up is fixed at 2400 A. Three front LEDs give a quick status: a flashing green LED for ready, an orange one at 90 % of Ir and a red one at 105 % of Ir.

Setting the C16N32D160 on site

Because the long-time dial on the C16N32D160 runs from 63 A to 160 A, a breaker bought at 160 A can still be set down to match a smaller cable or load. A load of 100 A, for example, can be set on the 100 A position rather than needing a different breaker. Whenever Ir is lowered, Isd, which is a multiple of Ir, shifts with it, so the short-time level in amperes falls as well. Record the settings on the panel documents and check them again when the load changes.

Coordination with devices upstream and downstream depends on those settings and on the fixed 2400 A instantaneous level; coordination data is outside the datasheet and is taken from the manufacturer coordination tables.

Mounting, connection and durability of the C16N32D160

The C16N32D160 is a fixed breaker for mounting on a backplate in horizontal, vertical or flat-on-back positions. Connections are at the front at both ends on a 35 mm pitch. The body is 105 mm wide, 161 mm high, 86 mm deep and weighs 2.2 kg. Mechanical durability is 40000 cycles; electrical durability is 40000 cycles at 440 V and half of In, 20000 at 440 V and In, 15000 at 690 V and In/2 and 7500 at 690 V and In. Power dissipation is 9.2 W per pole, which should be added to the heat budget of the enclosure.

The datasheet gives IP40, IK07, Class II on the front face, overvoltage category III and pollution degree 3. Full rating applies to 2000 m and derating from 2000 to 5000 m.

Applications of the C16N32D160 in Oman and the GCC

A 160 A electronic breaker with 50 kA at 415 V fits main and sub-distribution boards in industrial buildings, motor control centre incomers, utility auxiliary boards, water and desalination plants and process facilities across Oman and the GCC. The adjustable Ir helps where cable sizes vary between feeders. For boards installed in desert or coastal sites, the enclosure should handle dust and humidity, since IP40 protects only against solid objects larger than 1 mm.

Related NSX160 and NSX250 references to the C16N32D160

The same MicroLogic 2.2 concept appears at the NSX160B and NSX160F levels (for example C16B32D160 and C16F32D160) with lower breaking classes, and in the NSX250 range with 250 A trip units such as C25N32D250. The C16N32D160 sits at 50 kA with 160 A. MicroLogic 2.2 also has no earth-fault protection; where that is required, a trip unit like the MicroLogic 6.2 E (see C2536E250) is a different product with different functions.

Selection and RFQ checklist for the C16N32D160

• Part number C16N32D160, quantity, and fixed or other mounting requirement.
• System voltage, frequency and prospective short-circuit current at the board.
• Load current and the Ir setting that the design intends to use.
• Whether earth-fault or ZSI functions are needed, since they are absent here.
• Enclosure ventilation, ambient temperature and altitude.
• Delivery location and documents required.

Documents and quotation

A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above, and it is the document to check against your own drawings.

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 is not affiliated with the manufacturer.