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Eaton Crouse-Hinds N-TB (NXT) Series Enclosures

Cable Systems provide an in-house Design, Assembly & Certification service for this item.


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N-TB (NXT) enclosures
Fully removable hinged cover


  • Available in two types of material finish, N-TB (NXT) enclosures have been designed to accommodate rail mounted terminals or other electrical components
  • 316L stainless steel is recommended to give maximum protection for components in outdoor/aggressive environments


  • Twenty-eight basic sizes in five standard depths to optimize the accommodation of rail mountable terminals or components
  • Fully removable hinged cover, concealed hinges provide 180° opening
  • Cover mounting, two or three stainless steel captive screws on one side
  • Lip on upstand increases gasket contact area, ensuring high degree of ingress protection
  • Internal/external ground stud
  • 40mm wide mounting lugs for assembly on standard frames
  • Option of 0, 1, 2, 3 or 4 gland plates
  • One-piece gasket on cover and gland plates
  • Optional through cover padlock hasp available

Certifications and compliances:

Component certificates –
BVS13ATEXE014U and IECEx BVS 13.0026U:

  • UL50/C22.2 No. 94-M91
  • Type 3S, 4 – mild steel; Type 4X/IP66 – stainless steel

Factory options:

  • Terminals, glands and Myers™ hubs assembled according to customer specification
  • Drilled entries for cable glands fitted to customer specification
  • Tapped entries on 6mm thick gland plates

N-TB-T terminal boxes:

N-TB (NXT) enclosures are available assembled as custom configured and certified terminal boxes. Options include custom entries, cable glands and plugs with built-in terminals (Ex-e and Ex-i) and other equipment. Contact us for details.


  • IEC/EN 60079-0
  • IEC/EN 60079-7
  • IEC/EN 60079-31
  • IEC/EN 60529

EN/IEC certificates:

  • BVS16 ATEX-E-099X
  • IECEx BVS 16.0065X

Ambient temperatures:

  • 55B/-40C/-35°CD up to +40°C (T6 and maximum surface temperature of T80°C)
  • -55B/-40C/-35°CD up to +55°C (with temperature class T5 and maximumsurface temperature of T95°C)
  • -55B/-40C/-35°CD up to +65/70/80/100/110°C (with temperature class T4 and maximum surface temperature of T120°C)


  • Terminal boxes only available in 316L stainless steel enclosures

Electrical ratings:

  • Rated voltage up to 690V AC/DC; rated current up to 400A; conductor cross sections up to 240mm2


  • ATEX and IECEx: Ex e IIC T6/5/4 Gb or Ex eb IIC T6/5/4; Ex tb IIIC T80/95/120°C Db or Ex tb IIIC T80/95/120°C
  • NEC 500 and NEC 505: Class I, Division 2, Groups A, B, C, D and Class I, Zone 1, Aex e IIC T6/5/4
  • EAC CU TR: 1Ex e IIC T6/T5 Gb X or Ex tb IIIC T80/95/120°C Db X

Note: Ambient temperature range depends on ratings of built-in components and enclosure gland plate and gasket options.



Description Type Specification
Material Stainless steel grades: 316L (1.4401) (standard); 304 (1.4301)
(optional) or painted mild steel
Finish Stainless steel
Corrosion-resistant electro-polished surface
RAL 7032 (gray)
Gasket All types Foam-in-place silicone (standard); cut silicone for extended
temperatures (optional)
Cover mounting  All types Fully detachable hinged cover with 2 or 3 x M6 hexagon
head captive stainless steel screws
Grounding All types M10 internal/external ground stud; M6 internal ground stud on lid
Box mounting All types 4 x external lugs, 0.433” (11mm) clearance holes/slots
Equipment mounting All types 2 or 4 x stand-off pillars, 0.394” (9mm) OD x 0.590” (15mm) tall, tapped M6 x 0.394” (9mm)
Ingress protection All types IP66 to EN/IEC 60529
Service temperature range No gland plates

With gland plates

-55°C to +120°C

-35°C to +120°C (optional cut silicone gasket down to -40°C)

Impact resistance All types Minimum 7 J (Nm) to IEC/EN 60079-0, IK 10

Eaton Crouse-Hinds N-TB Series Enclosures Datasheet

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