H01H 51/00
Electromagnetic relays
Official title: Electromagnetic relays (relays using the dynamo-electric effect H01H53/00)
H01H51/00 (Electromagnetic relays) appears on 1,360 US grants and 875 published applications in this corpus.
Search patents in H01H- Granted patents
- 1,360
- Published applications
- 875
- Assignees
- 490
- Inventors
- 2,098
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 28 | 0 |
| 1977 | 17 | 0 |
| 1978 | 11 | 0 |
| 1979 | 18 | 0 |
| 1980 | 22 | 0 |
| 1981 | 17 | 0 |
| 1982 | 16 | 0 |
| 1983 | 15 | 0 |
| 1984 | 11 | 0 |
| 1985 | 31 | 0 |
| 1986 | 32 | 0 |
| 1987 | 29 | 0 |
| 1988 | 25 | 0 |
| 1989 | 27 | 0 |
| 1990 | 19 | 0 |
| 1991 | 39 | 0 |
| 1992 | 23 | 0 |
| 1993 | 26 | 0 |
| 1994 | 13 | 0 |
| 1995 | 17 | 0 |
| 1996 | 25 | 0 |
| 1997 | 21 | 0 |
| 1998 | 14 | 0 |
| 1999 | 35 | 0 |
| 2000 | 30 | 0 |
| 2001 | 22 | 7 |
| 2002 | 24 | 23 |
| 2003 | 20 | 24 |
| 2004 | 33 | 27 |
| 2005 | 20 | 21 |
| 2006 | 17 | 24 |
| 2007 | 11 | 17 |
| 2008 | 10 | 22 |
| 2009 | 23 | 40 |
| 2010 | 20 | 34 |
| 2011 | 24 | 28 |
| 2012 | 48 | 46 |
| 2013 | 52 | 64 |
| 2014 | 43 | 55 |
| 2015 | 51 | 69 |
| 2016 | 48 | 53 |
| 2017 | 58 | 42 |
| 2018 | 42 | 44 |
| 2019 | 47 | 38 |
| 2020 | 33 | 37 |
| 2021 | 30 | 36 |
| 2022 | 40 | 35 |
| 2023 | 33 | 22 |
| 2024 | 19 | 32 |
| 2025 | 22 | 17 |
| 2026 | 9 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01H 51/22Polarised relays540
- H01H 51/02Non-polarised relays538
- H01H 51/28Relays having both armature and contacts within a sealed casing outside which147
- H01H 51/01Relays in which the armature is maintained in one position by a66
- H01H 51/005Inversing contactors58
- H01H 51/29Relays having armature, contacts, and operating coil within a sealed casing45
- H01H 51/27Relays with armature having two stable magnetic states and operated by change36
- H01H 51/30Electromagnetic relays: specially adapted for actuation by ac13
All 9 subgroupsShow fewer
Recent patents
- Magnetic latching relay with microswitch8 Sep 2026US 12,731,746 B2Xiamen Hongfa Electric Power Controls Co., Ltd.
- Magnetic latching relay25 Aug 2026US 12,719,002 B2Xiamen Hongfa Electric Power Controls Co., Ltd.
- XD relay with manual override knob25 Aug 2026US 12,719,004 B2
- Multi-phase electromagnetic relay18 Aug 2026US 12,712,140 B2Xiamen Hongfa Electric Power Controls Co., Ltd.
- Relay30 Jun 2026US 12,671,047 B2Huawei Technologies Co., Ltd.
- Contactor1 Oct 2026US 2026/0302114 A1Schneider Electric Industries SAS
- Relay1 Oct 2026US 2026/0302116 A1Sensata Technologies (Wuhu) Co., Ltd.
- Switching device27 Aug 2026US 2026/0253825 A1Ellenberger & Poensgen GmbH
- Magnetic circuit system with enhanced intial electromagnetic attraction and high-voltage dc relay20 Aug 2026US 2026/0245820 A1Xiamen Hongfa Electric Power Controls Co., Ltd.
- Arc path formation unit and direct current relay comprising same6 Aug 2026US 2026/0229435 A1Ls E-Mobility Solutions Co., Ltd.
Most cited
By later US patents
- Actuator145US 5,256,998 ATechnische Entwicklungen Dr. Becker GmbH · 1993
- Actuators102US 4,253,493 A1981
- Sealed contact device with contact gap adjustment capability102US 5,892,194 AMatsushita Electric Works, Ltd. · 1999
- Remote control system75US 4,518,945 ALeviton Manufacturing Co., Inc. · 1985
- Magnetically controlled switch with wetted contact74US 4,238,748 AOrega Circuits et Commutation · 1980