Electrical Supplies
MCCB
Supplied by
About
- Schneider ComPact NSX moulded case circuit breakers across five frames, NSX100, NSX160, NSX250, NSX400 and NSX630, covering roughly 15 A to 630 A, with ComPact NS continuing from 630 A to 3200 A. Thermal-magnetic or Micrologic electronic trip units give adjustable long-time, short-time and instantaneous settings, in fixed, plug-in and withdrawable versions.
Application
Used on main and sub-main distribution, motor feeders and generator connections, where the adjustable trip unit is what allows selective coordination, the downstream MCB clears its own fault without the MCCB above it seeing enough time to trip. Electronic trip units add metering and communications, so the same device that protects the feeder also reports its load to the BMS.
Standards & Reference 5 cited
IEC/EN 60947-1
The general rules underneath every piece of low-voltage switchgear and controlgear: definitions, ratings and the test conditions the product-specific parts build on.
IEC/EN 60947-2
Circuit breakers: breaking capacity, utilisation categories and the coordination behaviour a protection study depends on.
IEC 60529
The IP code. Two digits stating how well an enclosure keeps out solid objects and water, IP65 and the like. The number a specifier reads first when equipment sits outdoors or in a plant room.
CCC
China Compulsory Certification: the mandatory safety mark for products placed on the Chinese market.
Also citedUL 489
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