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M521 — SWITCH,OPTOELECTRONIC

✓ Government record, cited
Brother · COMPONENT
PRODUCT OVERVIEW

M521: SWITCH,OPTOELECTRONIC.

M521 3/8" Black On Blue M tape (26.2 ft) For Use With: PT-100, PT-110, PT-55BM, PT-55S, PT-65, PT-65SB, PT-65SCCP, PT-65VP, PT-70, PT-70BBVP, PT-70BM, PT-70BMH, PT-70HOL, PT-70SP, PT-80, PT-80SCCP, PT-85, PT-90. This part is cataloged in the U.S. Government catalog under NSN 4530-00-394-8490, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
M521
NSN: 4530-00-394-8490
NIINs: 003948490, 010102038, 011624316, 012217742
FSC: 4530 — Fuel Burning Equipment Units
CAGE: 31923 — TODD COMBUSTION INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY BODY
specification/standard_data54418--52-1 MANUFACTURERS SOURCE CONTROL
part_name_assigned_by_controlling_agencyFSC APPLICATION DATA: TEST BENCH SET,SPECIALLY DESIGNED,ACFT
NSN4530-00-394-8490
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: Brother SWITCH,OPTOELECTRONIC TITLE COMPONENT PN M521 MFR Brother SWITCH,OPTOELECTRONIC
SUBSTITUTES & CROSS-REFERENCES 2
122K14PC1T08-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1220K14PC1T08-11Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M521?
M521 is a SWITCH,OPTOELECTRONIC manufactured by Brother.
What parts can replace M521?
There are 2 known substitutes for M521: 122K14PC1T08-1, 1220K14PC1T08-11. Substitute compatibility should be verified for your specific system.
What is the NSN for M521?
M521 is cataloged in the U.S. Government catalog under NSN 4530-00-394-8490. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.