The BHB3F is a BHB/ILB Series High-Power 3-Pin Bulkhead Connector (Female), rated at 600 V / 25 A per contact (75 A total) and pressure-rated to 600 Bar (6,000 m depth) mated. The BHB (Bulkhead) and ILB (In-Line) designations cover all mounting configurations for subsea power distribution — from equipment chassis feedthroughs to cable-to-cable power jumpers. Heavy-duty beryllium copper contacts and chloroprene rubber body provide long-term reliability in continuous high-current subsea service.
At a glance: 3 pins | 600 V | 25 A/contact | 75 A total | Mated 600 Bar | Open-face 400 Bar | Wet matings >500
Key Design Features
- 25 A per Contact, 75 A Total: Heavy-duty contacts sized for continuous subsea power delivery — thrusters, electric actuators, valve operators, and lighting rigs.
- Bulkhead (BHB) Panel-Mount Design: Jam-nut or flange-mount for instrument housing feedthroughs and equipment chassis panels.
- 3-Pin Configuration: 3-phase power distribution or 2-wire power plus ground/signal return; gold-plated contacts with insulation resistance >200 MΩ.
- 600 Bar Mated / 400 Bar Open-Face: Full 6,000 m depth capability for work-class ROV power distribution.
- 600 V Rated — AC and DC: Supports both AC power distribution (subsea pump motors) and DC power buses (ROV battery systems, thruster drives).
- Chloroprene Rubber Body: High dielectric strength body material; flexible across the full operating temperature range without cracking or stress whitening.
- Gold-Plated Beryllium Copper Contacts: Contact resistance <0.01 Ω; rated for 75 A continuous without derating.
- 316 SS or Titanium Hardware: Coupling nut, locking sleeve, and body hardware in 316 SS standard; titanium on request.
- >500 Wet-Mate Cycles: Wiper seals maintain clean contact faces across the rated cycle life for ROV hot-stab and tool-change use.
Electrical & Mechanical Specifications
| Parameter | Value |
|---|---|
| Model number | BHB3F |
| Series | BHB/ILB High-Power Multi-Pin Series |
| Number of contacts | 3 |
| Connector type | Bulkhead (BH/BHB/HPBH) |
| Voltage rating | 600 V DC/AC |
| Current per contact | 25 A per contact |
| Maximum total current | 75 A |
| Insulation resistance | >200 MΩ |
| Contact resistance | <0.01 Ω |
| Mated pressure rating | 600 Bar (8,700 psi) |
| Open-face pressure rating | 400 Bar (5,800 psi) |
| Rated depth (mated) | 6,000 m |
| Wet-mate cycles | >500 |
| Temperature (water) | −4°C to +60°C |
| Temperature (air) | −40°C to +60°C |
| Body material | Chloroprene rubber |
| Shell / coupling nut | 316 Stainless Steel (Titanium on request) |
| Contacts | Gold-plated beryllium copper |
| Locking sleeve | POM or Stainless Steel (mandatory before deployment) |
| O-ring seals | Nitrile |
| Cable jacket | Polyurethane (PUR) — customer-specified OD and length |
Typical Applications
- ROV thruster motor power supply — high-current direct drive and variable-speed drive connections
- Subsea electric actuator and valve operator power feeds
- Work-class ROV tether termination — high-power DC bus breakout at the vehicle
- Subsea pump motor power distribution — subsea production boosting systems
- Electric wireline and intervention tooling — coiled tubing electric drives
- Offshore wind subsea cable monitoring and structural health sensor power
- Subsea battery storage system connections — AUV recharging docking stations
- Scientific lander and benthic observatory power distribution
- ROV tooling skid power rails and junction box feedthroughs
Why Choose the BHB3F?
25 A/Contact — Purpose-Built for Continuous High-Current Service
BHB/ILB contacts are sized for 75 A continuous without thermal derating — suitable for 24/7 subsea power distribution duty cycles in production and observation systems.
Depth Rating Matched to Work-Class ROV Requirements
With a mated pressure rating of 600 Bar (8,700 psi), the BHB3F covers the full operating depth envelope of all work-class ROVs (e.g. Schilling UHD, Saab Seaeye Cougar, FMC Triton XLS) and the majority of permanent subsea installation depths worldwide.
Fully Interchangeable Within the Series
IL and BH body styles share the same mating face and contact geometry — a BH bulkhead mates with its IL cable-plug counterpart without adapters. All models are available with male or female contacts to match the preferred wiring convention of each installation.
Traceable Material and Pressure Testing
All high-power connectors are supplied with material certificates on request. Batch hydrostatic pressure testing to the rated depth is available for major oil & gas operator approval programmes (BP, Shell, TotalEnergies, Equinor, and equivalents).
Flexible Procurement
Available as bare connectors, factory-terminated cable assemblies, or matched IL + BH pairs.
Complete High-Power Underwater Connector Range
| Product | Model | Type | Pins | Voltage | Max Current |
|---|---|---|---|---|---|
| IL1F IL1M BH1F BH1M 1KV Underwater Connector Power Series 1 Pin | IL1F/IL1M/BH1F/BH1M | IL+BH | 1 | 1,000 V DC | 100 A |
| BHB2F Underwater Connector Power Series Bulkhead Connector 2 Pin Female | BHB2F | BH | 2 | 600 V DC/AC | 50 A |
| BHB2M Underwater Connector Power Series Bulkhead Connector 2 Pin Male | BHB2M | BH | 2 | 600 V DC/AC | 50 A |
| ILB2F Underwater Connector Power Series In-Line Connector 2 Pin Female | ILB2F | IL | 2 | 600 V DC/AC | 50 A |
| ILB2M Underwater Connector Power Series In-Line Connector 3 Pin Male | ILB2M | IL | 2 | 600 V DC/AC | 50 A |
| BHB3F Underwater Connector Power Series Bulkhead Connector 3 Pin Female | BHB3F | BH | 3 | 600 V DC/AC | 75 A |
| BHB3M Underwater Connector Power Series Bulkhead Connector 3 Pin Male | BHB3M | BH | 3 | 600 V DC/AC | 75 A |
| ILB3F Underwater Connector Power Series In-Line Connector 3 Pin Female | ILB3F | IL | 3 | 600 V DC/AC | 75 A |
| ILB3M Underwater Connector Power Series In-Line Connector 3 Pin Male | ILB3M | IL | 3 | 600 V DC/AC | 75 A |
| HPBH4F High Power Series Bulkhead Connector 4 Pin Female | HPBH4F | BH | 4 | 1,000 V DC/AC | 200 A |
| HPBH4M Underwater Connector High Power Series Bulkhead Connector 4 Pin Male | HPBH4M | BH | 4 | 1,000 V DC/AC | 200 A |
| HPIL4F Underwater Connector High Power Series In-Line Connector 4 Pin Female | HPIL4F | IL | 4 | 1,000 V DC/AC | 200 A |
| HPIL4M Underwater Connector High Power Series In-Line Connector 4 Pin Male | HPIL4M | IL | 4 | 1,000 V DC/AC | 200 A |
How to Select Your High-Power Underwater Connector
| Criterion | Guidance |
|---|---|
| Voltage | Up to 600 V → BHB/ILB series; up to 1,000 V → IL1/BH1 single-pin or HP4 4-pin |
| Current (total) | Up to 100 A → 1-pin 1kV series; up to 75 A (3-pin) → BHB/ILB; up to 200 A → HP4 |
| Pin count | Single-phase: 2 pins; 3-phase or 2+ground: 3 pins; high-power 3-phase: 4 pins (HP4) |
| Connector style | BH/BHB/HPBH for panel/bulkhead mount; IL/ILB/HPIL for inline cable-to-cable |
| Gender | F (female socket) or M (male pin) — select M on the cable side for safety (no exposed live pins) |
| Depth | All series rated ≥600 Bar mated — suitable for all work-class ROV depths |
| Cable size | Specify cable OD and conductor cross-section when ordering factory-terminated assemblies |
Frequently Asked Questions
Q: What is the maximum voltage and current for the BHB3F?
A: 600 V DC/AC, 25 A per contact (75 A total connector rating).
Q: Can the connector be mated underwater?
A: Yes — all models are wet-mate rated for >500 underwater connect/disconnect cycles. Install the locking sleeve before deployment.
Q: What is the rated depth?
A: Mated pressure rating is 600 Bar (8,700 psi), equivalent to approximately 6,000 m depth. Open-face rating is 400 Bar (5,800 psi).
Q: Can I connect AC and DC simultaneously through the same connector?
A: Each contact carries one independent circuit. Multi-pin models can carry AC and DC on separate contacts simultaneously, provided total current and voltage per contact are within ratings.
Q: Is a locking sleeve required?
A: Yes — always install the POM or SS locking sleeve after mating and before deployment. Never deploy without it; locking sleeves prevent accidental de-mating under cable weight or sea-state vibration in high-current applications where an unplanned disconnect could be hazardous.
Q: What cable sizes can be terminated?
A: Cable OD range depends on the body size and strain relief boot. Specify your cable OD, conductor cross-section, and insulation type when ordering — we will confirm compatibility or provide a custom boot solution.
Q: Are pressure test certificates available?
A: Yes — batch or per-unit hydrostatic pressure test certificates are available. Required for most major oil & gas operator equipment approval processes.
Q: What is the difference between BH and BHB / IL and ILB designations?
A: BH/IL is the standard power series (up to 600 V, up to 25 A/contact). BHB/ILB denotes the "Big" bulkhead/inline variant — same voltage but heavier contacts, upgraded for 25 A/contact continuous service in higher-duty applications.
Q: Can I order the connector without a cable (bare connector only)?
A: Yes — bare connectors, factory-terminated assemblies, and matched IL+BH pairs are all available.
Q: What body material options are available?
A: Standard body is chloroprene rubber; shell/coupling nut is 316 Stainless Steel. Titanium hardware is available on request for weight-sensitive or high-corrosion applications.
Installation, Mating & Maintenance Guidelines
Pre-Deployment Safety Check
High-power connectors carry potentially lethal voltages and currents. Before deployment: (1) Confirm power is isolated before mating or de-mating in air. (2) Inspect contacts for corrosion, deformation, or debris — clean with a dry lint-free cloth. (3) Check O-rings for cuts or permanent compression — replace if damaged. (4) Apply silicone grease to O-ring surfaces (not to contact faces). (5) Verify locking sleeve moves freely. (6) Remove protective caps immediately before mating — minimise air exposure time.
Mating Procedure
(1) With power isolated, align guide pins and insert the cable plug into the bulkhead with a single smooth stroke. (2) Thread coupling nut finger-tight. (3) Slide locking sleeve forward until the audible click confirms engagement. (4) Verify locking sleeve is fully locked by attempting to rotate coupling nut rearward — it must not move. (5) Before energising, conduct an insulation resistance check (minimum 200 MΩ at 500 V DC) between each contact and seawater ground. (6) Energise only after full submersion and pressure equalisation if PBOF version.
Storage & Maintenance
Rinse with fresh water after every seawater exposure. Store with protective caps installed in a dry, UV-shaded environment. Lubricate O-rings before storage if unit will not be deployed within 30 days. Inspect gold-plated contacts annually; any pitting or green corrosion requires contact replacement. Return to RV Power Group for factory refurbishment if contact resistance exceeds 0.02 Ω. Always document mating history and inspection records for programme traceability and safety compliance.
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