The Block,telephone Protector, cataloged under National Stock Number 5920-00-285-0286, is classified within Federal Supply Class 5920 (Fuses, Arrestors, Absorbers, and Protectors) of the Electrical and Electronic Equipment Components group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5920-00-285-0286 |
| Item Name | Block,telephone Protector |
| FSC / FSG | 5920 / 59 — Fuses, Arrestors, Absorbers, and Protectors |
| Status | ACTIVE |
| Overall Diameter | 0.530 INCHES NOMINAL IN |
| Shape | CYLINDRICAL |
| Material | CARBON |
| Usage Design | USED IN TELEPHONE CIRCUITS FOR PROTECTION AGAINST LIGHTENING OR HIGH VOLTAGE SURGES |
| Circuit Protector Block Location | GROUND SIDE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 307CBL0CK | 5/9 Secondary reference At and T Corp |
| 307CBL0CK | 5/9 Secondary reference American Telephone and Telegraph Co |
| 307C | 3/9 Design control — primary reference American Telephone and Telegraph Co |
| 307C | C/1 Advisory reference — outside the item-of-supply concept Lucent Technologies Inc Corporate Headquarters |
NSN 5920-00-285-0286 is a Block,telephone Protector, classified under FSC 5920, Fuses, Arrestors, Absorbers, and Protectors. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 3110-00-555-5207. Verify interchangeability with system specifications before substitution.
Key specifications for 5920-00-285-0286: Overall Diameter: 0.530 INCHES NOMINAL IN; Shape: CYLINDRICAL; Overall Length: 0.680 INCHES NOMINAL IN; End Item Identification: TYPE NO. TA-207/P. 5 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.