Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Tripping means
Patent
1988-12-09
1990-06-05
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Tripping means
335179, 335184, H01H 900
Patent
active
049317580
ABSTRACT:
An electro-magnetic shunt trip device has a pair of aligned plungers 10,24. A first plunger 19 acts on an operating member 20 which is pivotal and connected to a spring 18. The second plunger 24 is manually displaceable. A further spring 26 is located between the plungers. The plungers are part of a magnetic circuit, with a magnetic field being generated by a permanent magnet 30 and an electro-magnet 32. The permanent magnet and the electro-magnet generate fields of opposite polarity. If there is no current in the electro-magnet, the field provided by the electro-magnet will be sufficiently strong to hold the two plungers together. The spring 18 acting on the operating member will cause it and the plungers to move, so that the operating member is in a non-tripping position. If the second plunger is displaced into contact with the first plunger a tripping circuit in the electro-magnet will allow the spring 26 between the plungers to force them apart, movement of the second plunger being limited, so that the first plunger displaces the operating member.
REFERENCES:
patent: 3783423 (1974-01-01), Mater et al.
patent: 4213109 (1980-07-01), Marcoz
patent: 4251789 (1981-02-01), Russell et al.
patent: 4491812 (1985-01-01), Happach
patent: 4509026 (1985-04-01), Matsushita
Circuit Breaker Industries Limited
Harris George
LandOfFree
Electro-magnetic shunt trip device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electro-magnetic shunt trip device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electro-magnetic shunt trip device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-494017