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Plug-in Screw Connector System for Printed Circuit Boards
121-A-111 | 5.08 mm (0.2 in) Spacing - 2-24 poles
PICTURES
121-A-111 121-M-161 & 121-A-111 & 121-D-111 121-M-151 & 121-A-111
TECHNICAL INFORMATION
Description
Plug
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.
Technical Data
Center to Center Spacing: 5.080 mm (0.2 in)
Nominal Cross Section: 2.5 mm2 (3875 mils2)
Wire Stripping Length: 7.000 mm (0.276 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)
Comparative Tracking Index : CTI ? 600 V
Oxygen Index Rating : 33 %
Terminal Body: Nickel plated copper alloy
Wire Protector and Contact Spring: Tin plated copper alloy
Screw: Slotted head, zinc plated blue passivated, steel substrate M3
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APROVAL INFORMATION
UL File No. E69841 | CSA File No. LR24322
Type Current (A) Voltage (V) Application
Group AWG Screw Tightening
Torque
121-A-111 15 300 B 26-12 4.5 lbfin
5.08 mm 10 300 D 26-12 4.5 lbfin
121-A-111 15 300 B 26-12 0.51 lbfin
5.08 mm 10 300 D, E 26-12 0.51 lbfin
UL: 24-26 AWG range for factory wiring only.
Alternative Approval Information
Type Current (A) Voltage (V) Application
Group AWG Screw Tightening
Torque
121-A-111 15 300 C
10.16 mm 5 600 D
121-A-111 600 D, E
10.16 mm
Internationl Approval Information
Rated Impulse Withstand Voltage : 2500 V
PLUGGING PARTS
Plug-In Direction and Wire Entrance Parallel to PCB
TYPE 121-M-111 /-211
5.08 mm spacing - 2-24 poles
TYPE 121-M-151 /-251
5.08 mm spacing - 4-48 poles
TYPE 121-M-153 /-253
5.08 mm spacing - 4-48 poles
Plug-In Direction Perpendicular to PCB and Wire Entrance Parallel to
PCB
TYPE 121-M-121 /-221
5.08 mm spacing - 2-24 poles
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TECHNICAL DRAWING
Description :
Length of Connector (L)
L = No. of Poles x Center to Center Spacing
ILLUSTRATIONS
Description :
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SECTION A - SERIES 12
Terminal Blocks for Printed Circuit Boards
The Conecta system brings versatility and reliability to making connections between printed circuit
boards and electronic or electrical components. The elevator-style clamping mechanism has
excellent contact qualities and resistance to vibration to prevent wiring from loosening, ensuring
that connections are secure and reliable for the life of the component. The elevator-style clamping
mechanism allows for almost unlimited connect/disconnect cycles without harming the wires this is
especially important during the prototyping stage of design. The contact springs are designed to
ensure low resistance current transmission over the long term. The special design of the contact
springs provides for efficient long-lasting current transmission. A variety of headers and plugs
provide horizontal, vertical and 45-degree wire insertions in relation to the PCB to meet most
design needs.
These terminal blocks meet common industry design parameters and are interchangeable with
similar blocks from other manufacturers.
A choice of metric and inch spacing is available. Headers are available with and without sidewalls
the sidewall provides a greater degree of security by shrouding the contact pins and preventing
misalignment of the header and the plug. WECO is adding a 7.5 mm version, Series 122. This
allows easier wire insertion under crowded field wiring conditions.
Many headers and plugs are also available with mounting or locking flanges. Mounting flanges
provide additional contact security on the PCB. Plugs’ locking flanges are supplied with captive
screws the matching headers have threaded inserts. These special plug and header combinations
prevent the accidental separation of plug and header during use.
The metric 120-M-311 and 120-M-411 types are designed with a larger base area when more
stability and resistance to solder joint damage is required.
Screw-type plugs are captive and will not work loose and be lost during manufacturing or use. All
single level headers with standard spacing provide 2 to 24 positions for those applications requiring
very high wiring densities, our double level headers provide 4 to 48 poles.
If a printed circuit board design presents a difficult and crowded situation, raised headers in both
metric and inch spacing are available these allow the plug to connect to the high profile header
outside the enclosure if needed. The design of the plug and header includes a latching mechanism
to prevent accidental separation due to the effect of vibration while allowing easy disconnection
when required.
Each product has a "How To Order" area as well as a complete listing of UL and CSA approval
specifications, available options and accessories.
