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COBRA NC 0400 - 1000 B/C

COBRA NC screw vacuum pumps are highperformance and robust vacuum pumps for process technology. They are used wherever gases and vapors need to be pumped reliably and without contamination. Due to the dry screw technology, the compression chamber is completely free from operating fluids. This design feature minimizes process contamination and maximizes uptime by reducing maintenance intervals compared to other technologies.

Reliable pumping speed
COBRA NC screw vacuum pumps are designed to achieve a high, stable pumping speed – even at normal working pressure range of 75 to less than 1 Torr.

Operationally reliable
The variable-pitch screw design and free gas discharge allow for a high degree of fluid and particle compatibility. Optimum corrosion resistance is ensured by even temperature distribution. The outstanding levels of efficiency reduce the thermal demand and increase the life cycle.

Application-oriented
COBRA NC screw vacuum pumps are available in a range of application-specific versions, and can therefore be finely adjusted to suit any requirement. There are also a variety of custom versions available. Contact a knowledgeable Busch representative for more information.


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Technical specifications
The COBRA NC is a single-stage, rotary screw vacuum pump. Two screw rotors are rotating inside the cylinder. The pumping medium is trapped between the individual screw-shaped rotors, compressed and transported to the gas discharge. During the compression process, the two screw rotors do not come into contact with each other, or with the cylinder. This means there is no need for lubrication or operating fluids in the compression chamber.

Water cooling options include both direct water cooling or radiator cooling with aircooled heat exchangers. Due to a wide range of technical options and accessories, COBRA NC screw vacuum pumps can be perfectly adjusted to suit every process. The complete COBRA NC series includes pumps with maximum pumping speeds ranging from 82 to 1471 ACFM.

Accessories / Technical options

  • Flush package
  • Seal purge
  • Gas ballast
  • Knock out pots
  • Variable speed drives

COBRA NC 0400-1000 B/C
COBRA NC 0400-1000 B/C
Pumping speed

Air at 70 ºF. Tolerance: ± 10%

60 Hz
Pumping speed
Technical data COBRA NC 0400 B COBRA NC 0630 C COBRA NC 1000 B
Max. pumping speed ACFM 60 Hz 247 371 590
Ultimate pressure Torr 60 Hz 0.0075 0.0075 0.075
Nominal motor rating HP 60 Hz 15 20 40
Nominal motor speed RPM 60 Hz 3600 3600 3600
Sound level (ISO 2151) dB(A) 60 Hz 69 75 82
Approximate weight Lbs. 1433 1645 3050
Dimensions (L x W x H) inches 71 ½ x 23 ⅝ x 30 11/16 71 ¼ x 29 ⅞ x 30 ⅜ 92 x 35 ⅛ x 42 ⅞
Gas inlet (ANSI) / outlet (NPT) ANSI/NPT 3" / 3" 3" / 3" 5" / 5"

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COBRA NC 0400 - 1000 B/C

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