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Plug-in Screw Connector System for Printed Circuit Boards

110-M-121 /-221 3.50 mm (0.138 in) Spacing   -   2-24 poles Print this page

  • Header
  • 110-M-221 is equipped with a poka-yoke feature on each end sidewall. This prevents incorrect misaligned plugging when utilized with 110-A series plugs.

    110-M-121 have a small foot print that allows a fit when replacing competitive product. This is especially useful on PCB that are typically completely covered in components. It can be said that misalignment would in principle be prevented by the close components in close proximity.

    Internal features prevent backwards insertion.

    Installable on PCB assembled as per the wave solder technology specification
  • Coding keys 120-K are available to prevent the insertion of the wrong plug into a header. These are usually field inserted but can be factory installed if required. These coding keys are visible from the exterior, through slots in the header. Correct keying requires the removal of corresponding keying nibs from the 110-A plugs.
Technical Data

Center to Center Spacing: 3.500 mm (0.138 in)

Recommended Hole Diameter in PC Board: 1.200 mm (0.047 in)

Bill of Materials

Molding : Polyamide, Self extinguishing UL 94, V-0

Color : Grey

Temperature limits : Short Time : 140°C (284°F)
Continuous : 105°C (221°F)Low Limit : -40°C (-40°F)

Ambient Temp. Range (°C) : -40°C to 40°C

Comparative Tracking Index : CTI ≥ 600 V

Oxygen Index Rating : 33 %


Solder Pin: Tin plated copper alloy 0.8 x 0.8 mm (0.03 x 0.03 in.)

Visual Description
  • RoHS WEEE Pb free surface compliant
Approval Information UL File No. E69841  |  CSA File No. LR24322
    TYPE (Spacing)
    Current (A)
    Voltage (V)
    Screw Tightening
  • 110-M-121 /-221
    3.5 mm
     B, D 
  • 110-M-121 /-221
    3.5 mm
International Approval Information

Rated Impulse Withstand Voltage : 2500 V

Please fill in the How to Order box
Poka-yoke feature:
Plated component: solder pin
Ordering Notes
Version with 7 mm spacing (110-M-122 /-222).







WECO Electrical Connectors Inc.
18050 Trans-Canada Highway, Kirkland, QC Canada H9J 4A1
Tel.: 1.514.694.9136 fax.: 1.514.694.0956
Toll free.: 1.800.724.2928 (US and CAnada only)