3O Connectors Overview
The BIRNS Millennium 3O underwater connector is a powerful, extremely popular midsize connector. It is available with 7 to 46 contacts, and with 1 to 4 optical fibers, so it can be tailored to perform seamlessly in a wide range of extreme applications.

Ethernet: The Millennium 3O-17 subsea connector configuration – with our exclusive cable for Cat 8.2 use – provides data transfer rates of up to 9.4+/- 0.1 Gigabits per second at 6km.

BIRNS has open-face tested the 3O-13 for 10 cycles per NAVMAT P-9290 to 10,000 PSI (6.8 Km), with no degradation in any properties. Fiber optic configurations for Millennium 3O underwater connectors may have different overall dimensions than standard BIRNS Millennium underwater electrical connectors. Contact the BIRNS sales team (service@birns.com) for detailed technical information.

Extreme cold, extreme depth capabilities

We offer a new precision testing capability—an extreme low temperature, extreme depth testing system. The test system successfully allows 48 hour+ continuous testing of connectors and cable assemblies at 6km in a controlled 2°C (±1°C) environment.

It was initially developed to meet customer requirements for the 3O-1F3 configuration, which features the company’s new miniature 1.25mm optical ferrule.
3O Connector Images

Pin Configuration for: 3O-1F3

Shell-Insert Pin Configuration & Wiring Worksheet:


Shop all Products for: 3O-1F3

Click to Shop and purchase BIRNS Millennium products using the following links.

NOTE: Oil-Filled Connectors for RF and Optical circuitry are currently unavailable for online purchases.  Contact us for details.

O-Rings are available as replacements or additional parts. BIRNS minimum order is $300 USD

Have Questions?​

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If you need more product information, or have questions about placing an order, get quick answers using the form below, or CONTACT US directly.

3O Product Information:
Support Materials

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