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US 2007/0177324 A1Published application
Overload release
OwnerAlf Wabnerinventor
Life of this patent
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Abstract
An overload release is disclosed for interrupting a load current circuit. The release includes an electronic processing unit that generates a current signal according to the current in the load circuit, and a thermomechanical release that releases a switch latch according to the received current signal.
Claims17
An overload release for disconnection of a load circuit in the overload circuit, comprising:
- an electronic processing unit to produce a current signal as a function of the current in the load circuit, including an amplifier at whose output the current signal is produced;
- and
- a thermomechanical release to trip a switching mechanism as a function of the current signal, the electronic processing unit further including a difference-current device to produce a difference current signal on the basis of a current difference between at least two phases of the load circuit, the difference current signal being usable to vary a gain of the amplifier.
A method for disconnection of a load circuit in the overload circuit, the method comprising:
- transforming a load current in individual phases of the load circuit via a current transformer;
- supplying an output signal, produced on a secondary side of the current transformer, to an electronic processing unit in which it is amplified;
- and
- producing, after the amplification, a current signal which is supplied to a thermomechanical release as a tripping criterion for tripping of a connected switching mechanism;
- and
- producing a difference-current signal in the electronic processing unit on the basis of a current difference between at least two of the phases of the load circuit, the difference-current signal being usable to vary a gain of the amplifier.
3 more elements
(canceled)
(canceled)
An overload release for disconnection of a load circuit in the overload circuit, comprising:
- means for producing a current signal as a function of the current in the load circuit, the means including an amplifier at whose output the current signal is produced;
- and
- means for tripping a switching mechanism as a function of the current signal, the means for producing further including means for producing a difference current signal on the basis of a current difference between at least two phases of the load circuit, the difference current signal being usable to vary a gain of the amplifier.
Dependencies are inferred from the claim text.