H01H 81/00
Protective switches in which contacts are normally closed but are repeatedly opened
Official title: Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
H01H81/00 (Protective switches in which contacts are normally closed but are repeatedly opened) appears on 60 US grants and 33 published applications in this corpus.
Search patents in H01H- Granted patents
- 60
- Published applications
- 33
- Assignees
- 41
- Inventors
- 107
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 3 |
| 2004 | 5 | 1 |
| 2005 | 0 | 5 |
| 2006 | 3 | 3 |
| 2007 | 4 | 2 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 1 |
| 2014 | 0 | 0 |
| 2015 | 0 | 2 |
| 2016 | 1 | 2 |
| 2017 | 2 | 1 |
| 2018 | 3 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 2 |
| 2022 | 1 | 0 |
| 2023 | 0 | 2 |
| 2024 | 1 | 1 |
| 2025 | 2 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Mounting assembly and switching system with universal mounting system4 Nov 2025US 12,462,998 B2Eaton Intelligent Power Limited
- Insulator with asymmetric sheds7 Jan 2025US 12,191,093 B2S&C Electric Company
- PWM control for power distribution circuit interrupting devices28 May 2024US 11,996,687 B2Hubbell Incorporated
- Single-phase equipotential self-powered low-cost easy-to-install recloser8 Nov 2022US 11,495,957 B2Energisa S.A.
- Thermally responsive switch and method of manufacturing same15 May 2018US 9,972,470 B2Ubukata Industries Co., Ltd.
- Compact recloser23 Jul 2026US 2026/0213108 A1
- Compact recloser20 Nov 2025US 2025/0357063 A1
- Pwm control for power distribution circuit interrupting devices10 Oct 2024US 2024/0339824 A1Hubbell Incorporated
- Compact recloser30 Nov 2023US 2023/0386775 A1Hubbell Incorporated
- Insulator with asymmetric sheds27 Jul 2023US 2023/0238202 A1S&C Electric Company
Most cited
By later US patents
- Protected refrigerator compressor motor systems and motor protectors therefor60US 4,701,824 ATexas Instruments Incorporated · 1987
- Protected refrigerator compressor motor systems and motor protectors therefor57US 4,706,152 ATexas Instruments Incorporated · 1987
- Protected refrigerator compressor motor systems and motor protectors56US 4,713,717 ATexas Instruments Incorporated · 1987
- Fault current tolerable contactor44US 5,959,517 AEaton Corporation · 1999
- Circuit overload protective device32US 5,828,284 A1998