Underwater Connectors Micro Circular - 21 Contacts · Voltage rating 300 V DC/AC rms MCIL21M

MCIL21M Micro Circular In-Line Connector — Overview

The MCIL21M is a 21-contact Micro Circular in-line subsea connector, male (pins) face, wet-mateable and rated to 5 A per contact (40 A per connector) at 7,000 m working depth. It terminates a free cable and mates mid-run, with no panel or chassis mount required.

21 Contacts 300 V AC/DC 5 A per Contact 7,000 m Depth 500+ Wet Matings IP68

Key Design Features

• Wet-mateable: mate and demate in seawater; each contact carries its own moulded O-ring seal, so a single seal failure does not flood the connector.
• SubConn Compatible: identical face geometry, contact pitch and 5/8-18 UNF-2A thread, so it retrofits existing SubConn panels and harnesses without re-machining.
• Gold-plated contacts: sockets in brass UNS-C36000, pins in beryllium copper, holding contact resistance below 0.01 Ω across the full 500-cycle life.
• 5 A per contact: rated current with a 40 A connector limit for the 21-contact shell.
• Pressure qualified: 1,400 bar mated design depth, 800 bar open face, so the face survives handling and storage unmated.
• Moulded cable: factory-moulded strain relief, so there is no crimp joint to fail at the cable entry.

Technical Specifications

Materials

Cable & Termination

Mating & Compatibility

Typical Applications

AUV payload interfaces, multi-sensor oceanographic packages, compact tether breakouts, acoustic modem links.

Notes for Selection

The 21-contact body is rated 300 V and 5 A per contact with a 40 A connector limit, because thermal grouping limits dissipation in the compact shell. It uses a 21-conductor cable of 14.70 mm nominal OD.