5.5 x 2.1 mm barrel connector: identification only
A barrel connector description needs outer diameter, inner diameter and mating length; polarity is a separate requirement.
Also calledbarrel plugDC jack5.5 2.15521
A similar-looking barrel does not establish its inner diameter, usable insertion length or polarity. The depicted plug is one documented example.
Look for
The 5.5 × 2.1 mm label describes nominal outer and inner dimensions, not an approved replacement power supply. Do not probe or energize an unidentified connection.
Three-quarter view Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.
Mating face Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.
Fitted in place Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.
Recognition drawing Original schematic, not to scale. Drawing review pending.
Field answer / P028 · Source-checked, human review pending
Does a 5.5 × 2.1 mm barrel plug guarantee the right power supply?
First answerA barrel connector description needs outer diameter, inner diameter and mating length; polarity is a separate requirement.
Next observation: Use the exact device label and approved power-supply designation; do not test-fit to infer electrical safety.
T07 · Document the actual path
Barrel fit versus electrical requirements
Do not energize a barrel-powered device from a size match. Outer/inner diameter and exposed mating length are separate from required voltage, polarity and available current; unresolved electrical or review scope is a stop.
Keep this power path disconnected. Obtain exact manufacturer support and qualified technical review; declarations here do not clear the unresolved review gate.
Read the component drawing. The cited 5.5×2.1 examples have different exposed lengths; do not use overall component length as mating length.
Record the full labels and model/revision. A barrel size or total wattage cannot fill an absent voltage/polarity/current statement.
Obtain the specified supply or an explicit documented equivalent for the exact device; take unresolved questions to the manufacturer/qualified technician.
Documentation declarations only; no physical test, negotiated mode, delivered power, safe mating, pinout or compatibility approval. 3 missing prerequisites; 0 recorded conflicts.
Barrel connector section only · Revision not recorded · Recorded source inspection 2026-10-01. No electrical substitution or wiring instructions. Other dated interface claims in the article are not used.
Introduction; Specification · Revision not recorded · Recorded source inspection 2026-10-03. Factory cable assembly only. No extension, modified lead, negotiated runtime or universal device-support inference.
Sheet 1 of 1: side elevation and end view of 50-00540 plug with 24-00190 overmold; component table and exposed barrel dimension. · Revision not recorded · Recorded source inspection 2026-10-11. Only the exact named source/example supports the observation. No universal mating, wiring, maximum rating or mechanical tolerance is inferred. Drawing revision A, initial release 12/6/2016 as printed.
Sheet 1: assembled/end views; 5.5 outer / 2.1 bore / 12 +/- 0.5 exposed length. PDF text encoding is corrupted; visual source was inspected. · Revision not recorded · Recorded source inspection 2026-10-11. Exact source and example only; no device approval, universal rating, wiring or manufacturing tolerance is inferred. Remote raw-file retention is reported separately.
Three exact-equipment examples
These are source-backed documentation cases. They do not select your equipment, fill the form above, or report a hardware test.
T07-S1 · Supported within the stated documentation scope
The actual DS-1 label identifies the manufacturer’s supply family
Identify the documented supply for a DS-1 explicitly labelled for PSA.
pedal power input
BOSS DS-1 (actual DC IN label controls ACA/PSA revision) M05-26
manufacturer-designated PSA supply, actual regional input must match
The actual pedal’s DC IN label specifies PSA and the PSA-120S regional mains type is appropriate.
This is a supply-identification example; the task’s existing power stop is not cleared by this card.
Roland distinguishes ACA and PSA DS-1 versions and directs the owner to the DC IN label. BOSS identifies PSA-120S as a regional PSA-series product. M05-26 · M05-27
Supported within the stated documentation scope: The specified supply family is resolved for this labelled revision. This does not approve a different barrel supply or energize the connection.
Next check: Preserve the actual pedal label, exact regional supply and manufacturer instructions with the disconnected equipment.
Documentation scope only. This is not a hardware test, detected device state, pinout, electrical replacement approval or guarantee for another product/revision.
Entire support answer: two ACA/PSA versions; inspect DC IN label; use specified regional adapter only · Updated 2026-06-16 · Inspected 2026-10-22. Selected exact-model documentation only; no hardware test or broader family approval.
Features; photo caption identifies PSA-120S / 120V regional type; compatibility remains tied to actual pedal label · No document revision shown on inspected page · Inspected 2026-10-22. Selected exact-model documentation only; no hardware test or broader family approval.
The pedal is explicitly PSA-labelled; the proposed supply is the named MEAN WELL12V model.
MEAN WELL specifies12V and a center-positive P1J plug for this exact model. Roland says to use the supply specified by the pedal revision. M05-28 · M05-26
The proposed path disagrees with the documentation: The proposed replacement is not established by the device maker’s instructions. The plug’s dimensional label cannot supply missing polarity, voltage or permission evidence.
Next check: Keep the path disconnected and follow the pedal’s exact supply designation; do not use apparent fit to select an electrical substitute.
Documentation scope only. This is not a hardware test, detected device state, pinout, electrical replacement approval or guarantee for another product/revision.
Entire support answer: two ACA/PSA versions; inspect DC IN label; use specified regional adapter only · Updated 2026-06-16 · Inspected 2026-10-22. Selected exact-model documentation only; no hardware test or broader family approval.
PDF p.1 model encoding/P1J C+ plug; p.2 GST25A12-P1J 12V output; pp.4-5 plug options · GST25A-SPEC 2026-04-03 · Inspected 2026-10-22. Selected exact-model documentation only; no hardware test or broader family approval.
The name DS-1 is known but the ACA/PSA revision label and local supply region are not.
Roland’s updated support answer documents two supply versions and identifies the label as the discriminator. M05-26
Specific information is still missing: The product name does not resolve the supply version. The missing label is material, rather than a gap to fill from a generic barrel dimension.
Still needed:
Readable DC IN designation / actual revision
Appropriate regional supply input and exact manufacturer instructions
Next check: Ask the device manufacturer for revision-specific identification and supply guidance using the actual unit details.
Documentation scope only. This is not a hardware test, detected device state, pinout, electrical replacement approval or guarantee for another product/revision.
Entire support answer: two ACA/PSA versions; inspect DC IN label; use specified regional adapter only · Updated 2026-06-16 · Inspected 2026-10-22. Selected exact-model documentation only; no hardware test or broader family approval.
Features; photo caption identifies PSA-120S / 120V regional type; compatibility remains tied to actual pedal label · No document revision shown on inspected page · Inspected 2026-10-22. Selected exact-model documentation only; no hardware test or broader family approval.
Original identification schematic; not to scale. Contact marks are illustrative, unnumbered, and not a wiring or manufacturing drawing.
What this does not establish
A diameter pair alone leaves mating length, electrical polarity, voltage, current and device safety unresolved. Different manufacturer drawings document different exposed barrel lengths within the named 5.5 × 2.1 mm class.
Verify before choosing a cable or part
Stop at identification; use the device maker’s approved power supply guidance.
Check the full model and power label rather than guessing from diameter.
Do not infer voltage, AC/DC, polarity, current capacity or safety approval from fit.
Inspect the 3 inherited evidence claims and source limits
These are the existing, individually scoped observations—not fresh source inspections, a universal pinout, approved geometry or a device-specific compatibility verdict.
C028A / canonical evidence anchor — A barrel connector description needs outer diameter, inner diameter and mating length; polarity is a separate requirement.
Consumer identification / documented standard or product class only · source checked; independent sign-off pending.
C028C / canonical evidence anchor — Drawing 10-02319 dimensions the exposed barrel at 10 ± 0.50 mm; the component-table length of 23 mm is not that exposed mating length.
A separate example from the earlier 10-02319 assembly. Matching nominal diameters do not make their documented exposed lengths equal. · source checked; independent sign-off pending.
Record the equipment model and approved adapter specification.
Compare outside diameter, bore and exposed length from documentation.
Stop if the electrical requirements or exact plug requirement are missing.
Evidence for this decision · 4 source-scoped observations
C028B (private workspace) — Tensility drawing 10-02319 specifies a right-angle 5.5 × 2.1 mm plug example using component 50-00540 and overmold 24-00190.
This assembly only; appearance does not identify an unknown barrel. S473
C028C (private workspace) — Drawing 10-02319 dimensions the exposed barrel at 10 ± 0.50 mm; the component-table length of 23 mm is not that exposed mating length.
Drawing-specific distinction; no dimension is approved for fabrication. S473
C028D (private workspace) — Tensility drawing 55-00051 shows a 5.5 x 2.1 mm plug with an exposed barrel length of 12 +/- 0.5 mm.
A separate example from the earlier 10-02319 assembly. Matching nominal diameters do not make their documented exposed lengths equal. S485
C028A (private workspace) — A barrel connector description needs outer diameter, inner diameter and mating length; polarity is a separate requirement.
Consumer identification / documented standard or product class only S031
Manufacturer evidence is not an independent review, wiring assignment or hardware test.
Visual atlas / Series 02 / P028
Read the physical clue.
EXTERIOR · REVIEW PENDING
Cable-end plug. Tensility 10-02319 / 50-00540. Side elevation with end-view inset. Independently fitted; not a size reference.
What this view supports
A right-angle cable exit and cylindrical exposed barrel
The small end-view inset separates outside diameter from the central bore
What remains unknown
The silhouette cannot distinguish an unknown 2.1 mm bore from a lookalike. Dimensions and wiring in this one cable drawing are not universal.
The next useful check
With equipment disconnected, read the equipment adapter specification and verify outside diameter, bore, insertion length and polarity separately.
C028B Tensility drawing 10-02319 specifies a right-angle 5.5 × 2.1 mm plug example using component 50-00540 and overmold 24-00190.
This assembly only; appearance does not identify an unknown barrel. Source checked 2026-10-11; independent review pending. S473 · Evidence trail → (private workspace)
C028C Drawing 10-02319 dimensions the exposed barrel at 10 ± 0.50 mm; the component-table length of 23 mm is not that exposed mating length.
Drawing-specific distinction; no dimension is approved for fabrication. Source checked 2026-10-11; independent review pending. S473 · Evidence trail → (private workspace)
Exact source view, limits and rights
Visual inspection 2026-10-11. AI-assisted source inspection; independent drawing and rights reviews pending. These are original qualitative interpretations, not mechanical drawings, pinouts or approved connections.
Independent simplified vector interpretation and original factual paraphrase only. No manufacturer image, PDF, CAD, logo or traced path is redistributed. Independent technical and rights assessment remains pending.
Sheet 1 of 1: side elevation and end view of 50-00540 plug with 24-00190 overmold; component table and exposed barrel dimension.
Specific right-angle 5.5 × 2.1 mm cable-end example; not every barrel connector. Only the exact named source/example supports the observation. No universal mating, wiring, maximum rating or mechanical tolerance is inferred. Drawing revision A, initial release 12/6/2016 as printed.
Outer/inner diameter, length and polarity are separate requirements. No electrical substitution or wiring instructions. Other dated interface claims in the article are not used.
Canonical evidence is retained separately. Existing claim dates are unchanged; only new V118 claims have a new inspection date. No live electrical, energized probing, forced mating or optical-port inspection is recommended.
Flagship atlas / POWER / SAFETY
Barrel DC: fit is not safety
A barrel plug appearing to fit does not establish compatible voltage, polarity, current, or power-supply safety. Stop at identification and use the exact device’s approved electrical requirements.
LP01 P028Decision map, not a plug drawing or electrical wiring diagram. The original connector specimen remains above; this sequence shows what needs proof after shape identification.
Four facts to keep separate
01
Nominal form
Barrel descriptions need both outer and inner diameter and an appropriate mating length. Evidence: C028A
02
Electrical type
Physical fit does not establish AC versus DC or the required input voltage. Evidence: C028A
03
Polarity / load
Center polarity and available current are independent checks. Evidence: C028A
04
Approval
Only exact manufacturer guidance can establish an approved power supply for a device. Evidence: C028A
Common wrong conclusion
Never use “5.5 × 2.1 mm” alone as an equipment power-supply recommendation.
What to check next
Record the model, inlet marking and official replacement-supply part or ratings.
Verify rated voltage, AC/DC, polarity and capacity using manufacturer documentation.
If markings conflict or are absent, do not energize the device to test compatibility.
Why these statements are qualified · claim and source context
This is an original editorial decision study tied to existing source-checked claims. The following source inspections have not been renewed by this new page presentation, and none is independent engineering or model-by-model qualification.
S031 · CUIBarrel connector section only · source reviewed 2026-10-01 · Outer/inner diameter, length and polarity are separate requirements.
Unresolved: Actual device fit, required physical tolerances, pinouts, negotiations, electrical safety and hardware interoperability still require the identified manufacturer's documentation and any necessary independent review.
Inspect the named exterior study · Tensility 55-00051
Tensility 55-00051. Qualitative exterior only; not to scale. No pin numbering, device wiring, fabrication tolerance or mating approval.
Cable-end plug; Side exterior and isolated end-view inset. Sheet 1 assembled view and circular end view
Independent simplified vector interpretation; no manufacturer pixels, CAD, logo or traced paths reused. Independent rights review pending.
A barrel connector description needs outer diameter, inner diameter and mating length; polarity is a separate requirement. [C028A]
Tensility drawing 10-02319 specifies a right-angle 5.5 × 2.1 mm plug example using component 50-00540 and overmold 24-00190. [C028B]
Drawing 10-02319 dimensions the exposed barrel at 10 ± 0.50 mm; the component-table length of 23 mm is not that exposed mating length. [C028C]
Tensility drawing 55-00051 shows a 5.5 x 2.1 mm plug with an exposed barrel length of 12 +/- 0.5 mm. [C028D]
Identify the documented form
Separate barrel size from exposed length and electrical requirements.
Outer diameter, inner diameter and mating length are separately required descriptors. S031
Two cited plug examples have different exposed barrel lengths despite sharing the nominal diameter label. Keep length with the selected part. S473 · S485
Documented identity facts; exact part and variant scope remains with each value
Nominal contacts
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Positions / cavity span
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Populated contacts
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector role
plug (Tensility 10-02319)S473Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. This assembly only; appearance does not identify an unknown barrel.
Rows, pitch, dimensions, keying and view limits
Additional scoped facts; not a fabrication drawing or a mating approval
Contact rows
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact pitch
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Dimensions / axis
5.5 mm Nominal outer diameter; 2.1 mm Nominal inner diameter; 10 ± 0.5 mm Exposed barrel length (Tensility 10-02319 / component 50-00540); 12 ± 0.5 mm Exposed barrel length (Tensility 55-00051)S031 · S473 · S485Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. nominal_identifier; coaxial DC barrel identification reference Drawing-specific distinction; no dimension is approved for fabrication. A separate example from the earlier 10-02319 assembly. Matching nominal diameters do not make their documented exposed lengths equal.
Coupling / latch
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Keying / polarization
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
View convention
Not recordedNo qualified positive source view convention is normalized. Prior negative/schematic-only context is retained in variant_notes.
Contact gender / arrangement
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Mounting
right-angle molded cable assembly (10-02319 / 50-00540)S473Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example 10-02319 / 50-00540: Right-angle5.5x2.1mm barrel cable-end example. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Wire colors do not establish energised polarity. Exposed10mmbarrel and23mm component-body descriptions are distinct axes; existing dimensions retained.
Shell / form
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Manufacturer
Tensility (10-02319 / 50-00540)S473Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. This assembly only; appearance does not identify an unknown barrel.
Series
DC barrel (10-02319 / 50-00540)S473Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. This assembly only; appearance does not identify an unknown barrel.
Exact part / implementation
10-02319 / 50-00540 (10-02319 / 50-00540)S473Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. This assembly only; appearance does not identify an unknown barrel.
Recorded markings
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Keep this limit: A dimensional match does not establish polarity, voltage, available current or replacement approval. S031
Make the next check
Read the device and supply labels and exact mating-length requirement; do not energize an unidentified connection.
Existing source inspection and AI review remain distinct from independent technical review. A matching form does not establish a safe connection.
Recorded variant and source limits
Mating length is not established for the generic record.
Polarity, voltage, current, connector tolerances and replacement approval remain unknown until the exact device and supply are documented.
Prior view context (not a source-view value): Cross-sectional identification schematic labels only outer and inner nominal diameters; no polarity is drawn.
Not included. Check exact device and accessory documentation.
No electrical replacement approval.
This record is an identification starting point. It does not provide measured mating tolerances, a wiring pinout, electrical approval, or a list of verified device models. Use the original device and accessory documentation to resolve the remaining requirements.
Before you connect
What to check
Stop at identification; use the device maker’s approved power supply guidance.
Check the full model and power label rather than guessing from diameter.
Do not infer voltage, AC/DC, polarity, current capacity or safety approval from fit.
AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.
Locator: Barrel connector section only Access: public page. No electrical substitution or wiring instructions. Other dated interface claims in the article are not used.
Locator: Sheet 1 of 1: side elevation and end view of 50-00540 plug with 24-00190 overmold; component table and exposed barrel dimension. Access: public pdf text. Only the exact named source/example supports the observation. No universal mating, wiring, maximum rating or mechanical tolerance is inferred. Drawing revision A, initial release 12/6/2016 as printed.
Locator: Sheet 1 of 1: side elevation and end view of 50-00540 plug with 24-00190 overmold; component table and exposed barrel dimension. Access: public pdf text. Only the exact named source/example supports the observation. No universal mating, wiring, maximum rating or mechanical tolerance is inferred. Drawing revision A, initial release 12/6/2016 as printed.
Locator: Sheet 1: assembled/end views; 5.5 outer / 2.1 bore / 12 +/- 0.5 exposed length. PDF text encoding is corrupted; visual source was inspected. Access: public page. Exact source and example only; no device approval, universal rating, wiring or manufacturing tolerance is inferred. Remote raw-file retention is reported separately.
Claim scope: A separate example from the earlier 10-02319 assembly. Matching nominal diameters do not make their documented exposed lengths equal.. Next review due 2027-01-09.
Assessment 2026-10-22 · earliest scheduled source review 2026-12-30. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.
Scoped support: Specific right-angle 5.5 × 2.1 mm cable-end example; not every barrel connector.
Not established / limitations: Only the exact named source/example supports the observation. No universal mating, wiring, maximum rating or mechanical tolerance is inferred. Drawing revision A, initial release 12/6/2016 as printed.
Locator: Sheet 1 of 1: side elevation and end view of 50-00540 plug with 24-00190 overmold; component table and exposed barrel dimension.
Scoped support: The named 55-00051 example; neither the 38 mm web attribute nor the body length is used as its exposed barrel length.
Not established / limitations: Exact source and example only; no device approval, universal rating, wiring or manufacturing tolerance is inferred. Remote raw-file retention is reported separately.
Locator: Sheet 1: assembled/end views; 5.5 outer / 2.1 bore / 12 +/- 0.5 exposed length. PDF text encoding is corrupted; visual source was inspected.
Trace 4 claims to their source records
C028A · P028
A barrel connector description needs outer diameter, inner diameter and mating length; polarity is a separate requirement.
Claim scope: Consumer identification / documented standard or product class only
Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.
