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M300: High Reliability 3.00mm Pitch Power Connectors & Cable Assemblies with 10A Current Capacity

Setting new benchmarks in power delivery while dealing with both uncompromising operational environments & acute space constraints

In keeping with the company’s core objective of providing elevated levels of performance in the most compact of components, Harwin’s M300 family comprises robust cable-to-board, board-to-board and cable-to-cable power connectors. Available in 3, 6 and 10 contact formats, these units can be accompanied by a variety of cable assembly options (with lengths from 150mm to 450mm supplied).

Thanks to the patented 4-finger contact design employed, which relies on a Beryllium Copper alloy construction, connection integrity is always maintained – even when these connectors are subjected to high degrees of shock, vibration, or other forms of mechanical stress. Despite their limited dimensions, the narrow pitch connectors have a 10A current rating, and are therefore very well optimized for use in systems where the performance expectations are exacting, but space constraints also need to be contended with.

Additions to the M300 Series

A combination of stainless steel jackscrews ensure secure mating. Consequently, the connectors have a mating cycle durability of 1000 mates/un-mates. A series of polarization mechanisms are also incorporated to prevent mis-mating occurring, plus the recessed female contacts and shrouded housing arrangement for the male contacts help protect them from sources of potential damage. Furthermore, a back potted rear aids cable retention.

Halogen-free and RoHS compliant, the Harwin M300 offering is predominantly aimed at motorsport, defense, factory automation, satellite, robotics, renewable energy and avionics deployments. An extensive working temperature range is supported (spanning from -65°C to 175°C) and low outgassing properties are of major benefit if these connectors are deployed within a vacuum.

With available board real estate often at a premium, engineers need access to high performance technology that can be implemented within extremely confined spaces. Through our M300 connector products, power can be delivered while simultaneously keeping overall component size and weight low, with the accompanying cable assemblies adding an extra dimension of convenience.

Giorgio Potenza | Strategic Market Manager for Avionics, Defense & Space
Features and Benefits



Up to 10A per signal contact (all electrically loaded; 5A if 22AWG wire is used) at 3mm pitch

Capable of a variety of power uses within a compact design, saving PCB real estate

Proven 4-finger contact design

Maintains electrical continuity through high vibration and shock environments

Beryllium Copper Contact with -65°C to +175°C temperature range

Rugged and durable connector design with proven track record

1,000 Mating cycles durability

Suitable for both fit-and-forget and multiple testing and replacement cycles

Future-proofed material usage

Halogen-free, PFOS-free, SVHC-free and RoHS compliant

Low outgassing properties

Meets NASA outgassing requirements for vacuum or space usage

Full cable assembly options off-the-shelf

Reduced delivery , fully tested assemblies with hassle-free installation

Product Training Module



Specification Highlights

Highlights from the C048xx – M300 Component Specification:

  • Current rating = 10A per contact (5A with 22AWG wire)
  • Voltage rating = 600V AC/DC
  • Maximum Voltage = 1800V AC/DC
  • Number of Mating Cycles = 1,000
  • Temperature range = -65°C to +175°C
  • Vibration = 10G, 6 hours total


Range Options
  • Ready-made cable assemblies, single-ended, male and female available.
  • Recessed contacts – avoids accidental physical touch to the female and male contacts, by being sub-flush to the housing front edges.
  • Choice of contacts for 18, 20 or 22AWG cable.
  • 3 points of polarization to ensure correct mating orientation.
Markets and Applications
  • Aerospace, Defense & Security – Radar, avionics controls, guidance systems, UAVs, engine power management, vehicle electronics
  • Motorsport & Transport – Navigation, ERS controls, GPS and telemetry system
  • Space – Satellites & CubeSats, communications, launch systems, radar and communications
  • Industrial – Robotics, automation, drives & controls
  • Energy – Oil & Gas, renewable energy equipment
  • Ready-made cable assemblies, single-ended, male and female available.
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View the M300 Series Connectors

M300 High-Reliability Connectors