Submersible Enclosures for Subsea Cable Termination


Submersible Enclosures for Subsea Cable Termination

Product Reference Range: NAUT2, NAUT3, NAUT3A, NAUT4, NAUT5, NAUT6, NAUT7A, NAUT8

The Nautilus range of submersible enclosures is designed to protect critical electrical and fibre optic connections in demanding environments, including outdoor and submerged installations associated with high-voltage junction boxes and electrical enclosures. Suitable for use in Zone 1 hazardous areas, these enclosures provide secure housing for electrical equipment used within high-voltage networks, supporting reliable operation in offshore, coastal and other harsh outdoor high-voltage applications.

Constructed from marine-grade 316L stainless steel, the Nautilus enclosures feature high-integrity sealing systems to achieve IP68 submersible protection, ensuring long-term performance in flooded or submerged conditions. Certified for Zone 1 & 21 (Gas & Dust) with ATEX and IECEx approvals, the range delivers robust environmental and hazardous-area protection, making it ideal for use alongside high-voltage junction boxes and electrical enclosures in severe outdoor and sub-sea installations.

SEE TECHNICAL SPECIFICATIONS



submersible enclosure Overview

This Nautilus submersible enclosure is designed to protect critical electrical and terminal connections in environments prone to flooding or submersion, suitable for Zone 1 & 21 gas and dust hazardous areas. The enclosure features flexible cable entry options on all four sides, allowing secure connection of wiring and components for a variety of applications, including use alongside high-voltage junction boxes and electrical enclosures in demanding outdoor or submerged installations.

Features include IP68 submersible protection to 100 metres for five days (with an alternate 50 m for 14 days option), 316L stainless-steel construction with hinged cover and lifting eyes, and robust sealing to maintain integrity under pressure. Certified for Zone 1 & 21 hazardous areas with ATEX and IECEx approvals, the Nautilus range is engineered for long-term performance in harsh and high-risk applications.

Contact our experienced team to discuss your requirements or request a quotation for the Submersible Box. Thorne & Derrick International, based in the UK, are trusted suppliers providing expert technical advice and worldwide delivery.

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 Technical Specifications

Specifications
Enclosure Type Submersible Terminal Enclosure
Ingress Protection IP68 to EN60529 (100m for 5 days, optional 50m for 14 days)
Material 316L Stainless Steel with lifting eyes, hinges and fixings
Cable Entry Variable entry combinations on any of the four sides
Mounting Via rear mounting lugs
Hazardous Area Certification
Area Classification Group IIC Category 2 GD (Zone 1/21 and 2/22)
Apparatus Coding Ex e IIC T5 Gb, Ex tb IIIC T100°C Db,
Ex ib IIC T5 Gb, Ex tb IIIC T100°C Db,
Ex ia IIC T5 Ga, Ex ta IIIC T100°C Da
Certificate Number CML 14ATEX3021X, IECEx CML 14.0008X

Key submersible enclosure Benefits

✔ IP68 submersible protection to 100m for 5 days

✔ 316L stainless steel construction

✔ Ex e and multiple protection concepts for hazardous areas

✔ Variable cable entry on all four sides

✔ Rear mounting lugs for secure installation

✔ Flexible standard and custom sizes available

✔ Ideal for submerged and harsh offshore/onshore applications

✔ Maintains critical electrical connections in extreme environments

Submersible Enclosures

Nautilus enclosure — Part References & Dimensions

Nautilus Range — Dimensional Reference Table
Model External Dimensions (mm) Internal Dimensions (mm) Fixing Dimensions (mm) Weight (kg) Max Power Dissipation (W)
A B C D E F X Y Z Ga,Gb,Db Da
NAUT1 174 204 109 100 130 80 160 114 11 11 9.3 4.65
NAUT2 244 304 172 170 230 140 230 154 12.5 29 19 9.5
NAUT3 244 414 172 170 340 140 235 264 12.5 38 22 11
NAUT3A 294 414 172 220 340 140 289 264 12.5 44 29 14.5
NAUT4 284 474 222 210 400 190 291 324 12.5 53 32 16
NAUT5 324 424 222 250 350 190 327 274 12.5 54 32 16
NAUT6 390 470 233 310 390 190 393 320 12.5 86 36 18
NAUT7A 350 610 255 270 530 210 353 460 12.5 103 42 21
NAUT7B 450 510 255 370 430 210 453 360 12.5 108 42 21
NAUT8 480 570 255 400 490 210 483 420 12.5 124 44 22
Note: Other sizes available on request. See datasheet for accessories.

abtech

Thorne & Derrick are a specialist distributor of ABTECH hazardous area enclosures and HV junction boxes, providing expert technical support, competitive pricing and fast worldwide delivery across the full ABTECH product portfolio.

The ABTECH HVJB, ABJB and 4TJB product ranges include specialist 11kV and 33kV high-voltage junction boxes, designed for safe power distribution in Zone 1 and Zone 21 hazardous areas. These stainless-steel enclosures support applications such as power transmission, umbilical systems, pumps, instrumentation and control circuits. All products are certified to ATEX, IECEx and UKCA standards to ensure compliant installation in potentially explosive atmospheres.

ABTECH

ABTECH HV JUNCTION BOXES & ELECTRICAL ENCLOSURES

Data Sheets