H02H 3/33
Using summation current transformers
Official title: using summation current transformers (H02H3/347 takes precedence)
H02H3/33 (Using summation current transformers) appears on 1,079 US grants and 874 published applications in this corpus.
Search patents in H02H- Granted patents
- 1,079
- Published applications
- 874
- Assignees
- 366
- Inventors
- 1,333
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 20 | 0 |
| 1977 | 22 | 0 |
| 1978 | 7 | 0 |
| 1979 | 7 | 0 |
| 1980 | 7 | 0 |
| 1981 | 10 | 0 |
| 1982 | 11 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 7 | 0 |
| 1987 | 5 | 0 |
| 1988 | 5 | 0 |
| 1989 | 8 | 0 |
| 1990 | 9 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 14 | 0 |
| 1994 | 8 | 0 |
| 1995 | 11 | 0 |
| 1996 | 11 | 0 |
| 1997 | 11 | 0 |
| 1998 | 15 | 0 |
| 1999 | 27 | 0 |
| 2000 | 17 | 0 |
| 2001 | 21 | 3 |
| 2002 | 22 | 26 |
| 2003 | 29 | 23 |
| 2004 | 31 | 36 |
| 2005 | 25 | 27 |
| 2006 | 22 | 30 |
| 2007 | 31 | 37 |
| 2008 | 29 | 33 |
| 2009 | 30 | 28 |
| 2010 | 26 | 36 |
| 2011 | 34 | 24 |
| 2012 | 20 | 29 |
| 2013 | 31 | 39 |
| 2014 | 24 | 37 |
| 2015 | 32 | 25 |
| 2016 | 27 | 46 |
| 2017 | 34 | 45 |
| 2018 | 35 | 52 |
| 2019 | 50 | 35 |
| 2020 | 53 | 45 |
| 2021 | 48 | 41 |
| 2022 | 43 | 32 |
| 2023 | 39 | 44 |
| 2024 | 36 | 36 |
| 2025 | 39 | 36 |
| 2026 | 17 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H02H 3/334With means to produce an artificial imbalance for other protection or monitoring434
- H02H 3/338Also responsive to wiring error194
- H02H 3/331Responsive to earthing of the neutral conductor78
- H02H 3/332With means responsive to dc component in the fault current47
- H02H 3/337Avoiding disconnection due to reactive fault currents36
Recent patents
- Self-test auto monitor ground fault circuit interrupter (GFCI) with power denial6 Oct 2026US 12,754,232 B2Hubbell Incorporated
- Method for checking the adequacy at the residual currents of differential circuit breakers18 Aug 2026US 12,712,355 B2Chauvin Arnoux
- Protective wiring device11 Aug 2026US 12,706,266 B2Pass & Seymour, Inc.
- Leakage current detection and interruption device for power cord and related electrical connectors and electrical appliances23 Jun 2026US 12,665,407 B2
- Leakage current compensator circuit9 Jun 2026US 12,650,448 B2Hella GmbH & Co. KGaA
- Method for processing a current transformer signal24 Sep 2026US 2026/0291210 A1Schneider Electric Industries SAS
- Leakage protection device and electrical device27 Aug 2026US 2026/0253828 A1Sensata Technologies Changzhou Co., Ltd.
- Frequency dependent ground fault interrupt13 Aug 2026US 2026/0235699 A1Pass & Seymour, Inc.
- Power receiving and transforming equipment leakage current/stray current digital safety control system13 Aug 2026US 2026/0237996 A1Technomirai Co., Ltd.
- Ground fault circuit interrupter and detection method for the same6 Aug 2026US 2026/0229870 A1Schneider Electric Industries SAS
Most cited
By later US patents
- Electronic circuit breaker with protection against sputtering arc faults and ground faults252US 5,224,006 AWestinghouse Electric Corp. · 1993
- Apparatus and method of detecting ground fault in power conversion system248US 6,927,955 B2Canon Kabushiki Kaisha · 2005
- Arc fault detector with circuit interrupter222US 6,433,978 B1Leviton Manufacturing Co., Inc. · 2002
- Self testing circuit breaker ground fault and sputtering arc trip unit204US 5,459,630 AEaton Corporation · 1995
- Photovoltaic power generation system196US 6,812,396 B2Canon Kabushiki Kaisha · 2004