Switching method for an electromagnetic switching device and an electromagnetic switching device corresponding thereto
AssigneeSiemens Aktiengesellschaft
InventorsGeorg Bollinger, Peter Donhauser
Life of this patent
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Abstract
The aim of the invention is to protect an electromagnet switching device when a load is switched to a supply voltage. A current that flows through the load contact is monitored. The electric circuit is interrupted when the current exceeds a threshold value that is below the current carrying capacity of the load contact. The electric circuit is automatically closed again after the current which flows through the load contact has decreased.
Claims17
A switching method for an electromagnetic switching device having at least one load contact with a current carrying capacity, wherein closing of the at least one load contact closes a circuit, comprising:
- opening the circuit when a current flowing through at least one load contact exceeds a current limit value;
- automatically closing the circuit when the current flowing through at least one load contact falls below the current limit value as a result of the opening of the circuit, wherein the current limit value is at most as great as the current carrying capacity.
An electromagnetic switching device, comprising:
- at least one load contact, which has a current carrying capacity;
- and
- a load current monitoring element, wherein a circuit which can be closed by the load contact is adapted to be opened by the load current monitoring element when a current flowing through the load contact exceeds a current limit value, wherein the circuit is adapted to be automatically closed again by the load current monitoring element when the current flowing through the load contact falls below the current limit value again as a result of the opening of the circuit, and wherein the load current monitoring element is designed such that the current limit value is at most as great as the current carrying capacity.
Dependencies are inferred from the claim text.