What Bel Fuse makes for data centers
public
Bel Fuse is a publicly listed company. It appears on 2 parts of the AI data center — Power shelves & PSUs and Circuit protection, fuses, surge, grounding — in the role of manufacturer. Those parts sit in Layer 4 — Servers, racks & integration and Layer 7 — Electrical: power distribution (grid to rack). Its shares trade on US exchanges (NYSE/Nasdaq) as BELFA.
Listing
US exchanges (NYSE/Nasdaq): BELFA· 161 USD -0.55% · mkt cap 2.3B USD
Snapshot 2026-10-25T10:41:17Z — nightly, not real-time.· Chart on TradingView ↗
Exposure
2 parts across 2 layers
No disclosed data-center revenue share on file.
Parts, by layer
Layer 4 — Servers, racks & integration
| Part | Role | Confidence | Competitors | Note |
|---|---|---|---|---|
| Power shelves & PSUs | manufacturer | disclosed | AcBel, Advanced Energy/Artesyn, Chicony Power, Cosel, Delta Electronics, Eaton |
Layer 7 — Electrical: power distribution (grid to rack)
| Part | Role | Confidence | Competitors | Note |
|---|---|---|---|---|
| Circuit protection, fuses, surge, grounding | manufacturer | inferred | Schneider Electric, ABB, Eaton, Littelfuse, Mersen, Siemens |
Where Bel Fuse sits in the stack
Bel Fuse's placements in this catalog cover 2 parts, from layer 4 (servers, racks & integration) to layer 7 (electrical: power distribution (grid to rack)). None of them currently carries a sourced supply constraint tag. Across these parts it overlaps with other companies most often on the lines below.
What these parts are
- Power shelves & PSUs — The rack-mounted power shelves that convert facility AC or DC input into the regulated rail distributed to trays across the rack, built to the Open Rack V3 33 kW-class spec used in rack-scale AI systems.
- Circuit protection, fuses, surge, grounding — Fuses, circuit breakers, surge protection devices, and grounding systems that protect electrical equipment and personnel throughout the power chain, from switchgear down to the rack.
Closest peers in this catalog
Disclosed customers
| Customer | % | Metric | Period | Filing |
|---|---|---|---|---|
| largest customers (combined) | 10% | revenue | 2025-12-31 | 10-K |
Questions about Bel Fuse
- What does Bel Fuse make for AI data centers?
- This catalog places Bel Fuse on 2 parts: Power shelves & PSUs (manufacturer) and Circuit protection, fuses, surge, grounding (manufacturer).
- Is Bel Fuse publicly traded?
- Yes — Bel Fuse is listed on US exchanges (NYSE/Nasdaq) under BELFA. Prices shown on this page are a nightly snapshot, not real-time, and nothing here is investment advice.
- Who else makes power shelves & PSUs for AI data centers?
- AcBel, Advanced Energy/Artesyn, Chicony Power, Cosel, Delta Electronics and Eaton are also placed on Power shelves & PSUs in this catalog.
- How well sourced are these placements?
- Every part→company placement carries a confidence tag. For Bel Fuse the mix is 1 disclosed and 1 inferred. "disclosed" means the company or a filing says so; "reported" comes from trade press or a reference-design list; "inferred" is a lead from the taxonomy with no citation yet. Treat reported and inferred as leads, not facts.
Answers are generated from this catalog's own rows — see sources & method.