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Compact NSX and Masterpact NW DC circuit breakers offer pole-connection possibilities.

Designed for direct current
Performance levels and quality signed Schneider Electric The creation of a dependable and high-performance DC range requires a large amount of specific design and development work in addition to that invested in the original AC range.

Schneider Electric called on its proven industrial experience in the AC field and its recognised know-how in current interruption to develop a high-performance DC range.
Schneider Electric decided to use the cases and accessories of its Compact NSX and Masterpact NW ranges with:

1) a high-performance design for the breaking chambers or the poles intended specifically for DC applications (e.g. 100 kA at 250 V per pole for Compact NSX and 85 kA at 900 V for two poles for Masterpact NW)
2) fast trip units developed for DC applications
3) optimised pole-connection and isolation possibilities that are both simple and dependable.


Optimised and dependable series or parallel connection of poles



Series connection - controlled temperature rise and guaranteed performance Schneider Electric DC circuit breakers comply with product standards IEC 60947-1 and 2.
To that end, series connection of poles meets:

1) temperature-rise conditions. Connections specifically designed to dissipate heat mean the thermal model is equivalent to that for AC applications. The devices dissipate the temperature rise produced by relatively short series connections
2) optimum safety conditions. Connections are designed for extreme operating conditions (insulation and safety clearances, ultimate breaking capacity, high pollution levels, etc.).

Parallel connection - optimisation Certain DC systems require high power levels (hundreds to thousands of amperes) at reduced voltages, most often y 250 V.

The configurations of DC systems and the exceptional performance levels of Compact NSX circuit breakers mean the poles can be parallel connected. This technique virtually doubles, triples or quadruples the current rating depending on the type of circuit breaker and thus reduces the cost of solutions.
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