Brusa Elektronik AG — 2 prefixes (MA-L)

A MAC address starting B4:0B:78 or B4:0B:7A belongs to Brusa Elektronik AG, a Swiss maker of power electronics for electric vehicles, typically seen on automotive or industrial control hardware such as motor inverters, on-board chargers, and DC/DC converters rather than general-purpose IP network gear.

Brusa Elektronik AG was founded in 1985 in Sennwald, St. Gallen, Switzerland. Both prefixes register to the identical registrant name and street address, Neudorf 14, Sennwald, St. Gallen, CH-9466, which alone clears the substance bar for a vendor entry.

The company's current published address is Langäulistrasse 60, 9470 Buchs — the group's post-restructuring headquarters, and a different address from the one on the IEEE registration. That gap is expected: these OUIs were registered under the older Sennwald-era entity, before the group split into today's co-located structure.

At that Buchs address, three sister entities now operate side by side: Brusa HyPower AG (on-board chargers, DC/DC converters), Brusa Technology AG (engineering/services, e-powertrain components), and Brusa Elektronik AG (inductive charging). Brusa Elektronik AG's own site today lists only the ICS1 wireless power transfer system (IEC 61980).

Historically, before that restructuring, product lines under the Brusa Elektronik name included the DMC547 inverter family (SoftSwing resonant switching, up to ~200kW) and the NLG5/NLG6 on-board charger family (CAN-bus interface for battery-management-system control). These lines are attested by third-party sources rather than the company's current site, so they are tagged Likely and framed as historical.

These are CAN-bus-governed automotive components, not named Ethernet appliances — no primary source ties a specific Ethernet/MAC interface to a named Brusa product, so the exact device that carries the MAC stays Unknown rather than asserted; a diagnostic gateway, dev/test bench, or internal control-board NIC are plausible but unverified candidates.

A related but legally distinct company, Brusa HyPower AG (Langäulistrasse 60, Buchs, CH-9470), holds a separate OUI, B4:98:82, under its own registrant name and address, and is not folded into this entry's prefixes. The 2023 spin-off documented on the company's own history page names Brusa Technology AG, not HyPower, as the new entity — HyPower is a co-located sister company, not a confirmed spin-off of Brusa Elektronik.

No CVE, CISA advisory, or malware association naming Brusa Elektronik AG or its products was found as of an August 2026 search — a sourced negative, not an exhaustive clearance. IEEE's public OUI registry publishes no assignment or registration date for either prefix; any "date registered" shown by third-party lookup sites is a database-scrape artifact, not an IEEE fact.

IEEE assignment

2 prefixes → Brusa Elektronik AG, Neudorf 14, Sennwald, St. Gallen, CH-9466 [Confirmed] — the IEEE MA-L registry B40B7A, B40B78

Registry / block size

MA-L (24-bit OUI); 2 IEEE prefixes for this entity [Confirmed] — the IEEE MA-L registry. NOTE: IEEE's public OUI data publishes no assignment/registration date; any third-party "date registered" is a database artifact, not an IEEE fact.

HQ / country

Neudorf 14, Sennwald, St. Gallen, CH-9466, Switzerland is the IEEE-registered address [Confirmed] — the IEEE MA-L registry B40B78, B40B7A; corroborated independently by search.ch business listing. The company's current published address, Langäulistrasse 60, 9470 Buchs, is the group's post-restructuring HQ and a different address from the one on this registration

[Confirmed] — brusa.biz

Company status

active [Confirmed] — brusa.biz

Device types

Current, per brusa.biz: inductive/wireless charging (ICS1, IEC 61980) [Confirmed]. Historical, pre-restructuring, under the Brusa Elektronik name: EV traction inverters, on-board chargers, DC/DC converters [Likely] — automotiveworld.com, charin.global. Specific Ethernet/MAC-bearing device: Unknown

[Likely] — no primary source ties a named product to an Ethernet interface

Notable products

ICS1 wireless charging system (IEC 61980) [Confirmed] — brusa.biz. Historical: DMC547 inverter family, NLG5/NLG6 on-board chargers [Likely] — automotiveworld.com, charin.global

Verified sample prefixes (both MA-L, Brusa Elektronik AG)

B4:0B:78, B4:0B:7A [Confirmed] — the IEEE MA-L registry

Related-entity caveat

B4:98:82 → "Brusa HyPower AG", Langäulistrasse 60, Buchs, CH-9470 — a different registrant name/address, one of three co-located sister entities (Brusa HyPower AG, Brusa Technology AG, Brusa Elektronik AG) sharing that address [Confirmed] — the IEEE MA-L registry B49882, brusahypower.com. The 2023 spin-off named on the company's history page is Brusa Technology AG, not HyPower

[Confirmed] — brusatechnology.com/history

Security note

no CVE, CISA advisory, or malware association found as of an August 2026 search [Likely — sourced negative, not exhaustive] — general NVD/CISA/web search

Related vendors

Brusa HyPower AG (separate legal entity, own OUI B4:98:82); Brusa Technology AG (2023 spin-off per company history, no separate OUI identified)

Analyst note

an OUI of B4:0B:78 or B4:0B:7A on a globally-administered address identifies genuine Brusa Elektronik AG hardware; the IEEE-registered address (Sennwald) predates the company's post-restructuring move to Buchs, so device context spans the company's current inductive-charging line and its earlier inverter/charger lines rather than a single fixed product.