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3.00mm pitch High-Reliability Connectors

Vibration and shock resistant,
compact power future-proofed.

  • 10 Amps per contact
  • Up to 175°C operating temperature
  • Secure jackscrew system
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75 products in M300

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3mm pitch Hi-Rel Connectors

Harwin’s M300 series brings a compact power solution to the High-Reliability portfolio, ideally suited for a wide variety of testing environments and conditions. Connectors are currently available in 3-contact single row, 6- and 10-contact double row.


  • 10A per contact (all electrically loaded; 5A if 22AWG wire is used)
  • Proven 4-finger contact design to maintain electrical contact through high vibration and shock
  • Beryllium Copper Contact for improved temperature range: -65°C to +175°C
  • 1,000 Mating cycles durability
  • Future-proofed Materials - halogen-free, PFOS-free, SVHC-free and RoHS compliant
  • Low outgassing properties - 0.68% TML, 0.01% CVCM, 0.26 WVR (Water Vapour Recovered)
  • Scoop-proof female connectors
  • Ready-made Off-The-Shelf cable assemblies available

Other useful features include keyway polarisation, and identification of the #1 position. Harwin provides CAD Models and Test Reports to assist with your design activities.

M300 Series - Cable options


All M300 connectors feature keyway polarisation and position #1 identification. All styles are available in 3-contact single row, 6- and 10-contact double row.

PCB Mount Connectors
  • Female Vertical PC Tail/Throughboard
  • Male Vertical PC Tail/Throughboard
Cable Mount Connectors
  • Female Cable Contacts
  • Female Cable Housings
  • Male Cable Contacts
  • Male Cable Housings
Cable Assemblies


The following information is highlights from the M300 performance characteristics. Download the complete Component Specification C048xx in PDF format for more detail.



Female Contacts High performance Beryllium Copper contact, Brass outer shell; Gold finish
Male Contacts Brass, Gold finish
Housing 30% Glass-Filled High Temperature Nylon (Polyamide) 4T, rated to UL94V-0
Jackscrews Stainless Steel



Current 10A max per contact, all contacts electrically loaded (reduces to 5A for 22AWG wire)
Working Voltage 600V DC or AC peak (150V DC or AC peak at 70,000ft/21km/44mbar)
Maximum Voltage 1,800V DC or AC peak (450V DC or AC peak at 70,000ft/21km/44mbar)
Contact Resistance 6mΩ max
Insulation Resistance 100MΩ min



Operating Temperature -65°C to +175°C
Humidity Classification 56 days at 90% RH
Vibration (with latches) 10-500Hz, 1.52mm, 98m/s² (10G), 9 hours total
Shock (with latches) 981m/s² (100G) for 6ms
Outgassing 0.68% TML, 0.01% CVCM,
0.26 WVR (Water Vapour Recovered)



Durability (contacts) 1,000 mating cycles
Insertion force (per contact) 9N max
Withdrawal Force (per contact) 1N min


Wire specification

Recommended Wire types M22759/11, BS 3G 210 Type A, MIL-W-16878/6 type E
Wire Sizes 18 to 22 AWG
Insulation Diameter Ø1.8mm max for 18 and 20 AWG, Ø1.4mm max for 22 AWG
Strip Length 2.00mm


Component Specification (including pin numbering system) C048XX - M300 Series Connectors
Catalog pages M300 - Product Catalog
Test Report - General HT043xx - M300 General Testing
Product Training Module M300 Overview
Outgassing figures Outgassing data list
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