Molded Case Circuit Breaker Patents: Top Companies & Trends 2026
Molded case circuit breaker interruption patents: who leads and where filings are heading
47.0% concentration. The five largest assignees hold 1,354 of 2,883 records in scope — nearly half the field sits with a handful of filers. Filings rose to a peak of 91 in 2019, then eased to 60 by 2024 — a 14% decline over the 2021-2024 span. 2025 and 2026 figures are still filling in as publication lags filing by roughly 18 months, so the most recent years should not be read as a continued decline.
- 1EATON CORP16.8%
- 2EATON INTELLIGENT POWER LTD9.6%
- 3WESTINGHOUSE ELECTRIC CORP8.8%
- 4GENERAL ELECTRIC CO6.2%
- 5MITSUBISHI ELECTRIC CORP5.6%
See the full molded case circuit breaker interruption analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on this landscape
Who holds the most patents on molded case circuit breaker interruption?
The dataset ranks 100 assignees by patent family count across 2,883 records. The leading assignee holds 483 records on its own, and the top five together account for 1,354 records, or 47.0% of everything in scope. That level of concentration means a small number of established switchgear manufacturers control most of the claimed interruption mechanics, so new entrants should expect dense prior art around arc chute and contact-repulsion designs specifically.
Is filing activity in this space growing or shrinking?
Filings peaked at 91 in 2019 and eased to 60 by 2024, a 14% decline over that three-year span. That is a moderate pullback rather than a collapse, and it should not be read as the field going cold. Publication lags filing by roughly 18 months, so the lower counts shown for 2025 and 2026 in the raw trend line are an artefact of incomplete data, not a real drop-off.
What technology areas does this patent search actually cover?
The search combines terms for molded case circuit breakers, arc extinguishing chambers and current limiting breakers with terms for arc chutes, arc runners, let-through energy, breaking capacity, contact repulsion and gas venting. In practice, 92.3% of the 2,883 records carry the H01H switches-and-relays classification, meaning the corpus is heavily weighted toward core interruption mechanics rather than the broader protective-circuit or power-distribution technologies that sometimes appear alongside breaker patents.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Molded Case Circuit Breaker Interruption covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.