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US 7,679,881 B2Granted
Electrical entity with opening of the load current circuit in an explosion-vulnerable environment
AssigneeSiemens Aktiengesellschaft
InventorsMichael Bräunlich, Ralf Lohse
Life of this patent
Estimating the term…
Abstract
There is described an electrical system including a device which features a load current circuit and connection terminals for connection of the load current circuit. In the supply line to the connection terminals, separation contacts are present for separating the load current circuit during operation of the device. Means for explosion protection are provided in connection with the separation contacts.
Claims10
An electrical system, comprising:
- a device having a load current circuit and connection terminals for the load current;
- an electrical supply line for the load current to the connection terminals;
- and
- a plurality of explosion protected separation contacts in the supply line to separate the load current circuit during operation of the electrical system,
- wherein the device is an assembly of a modular control system that includes a terminal module to which the assembly is mechanically and electrically adapted, and wherein a lock for the assembly is provided, which prevents the release of the assembly from the terminal module in a closed state of the explosion protected separation contacts the lock includes a pin part equipped with an arm having an angled end engaged in an opening of a device housing in the closed state of the separation contacts and therefore preventing the release of the relay assembly.
2 more elements
A method for separating a relay from a load current circuit during a current flow in an explosive vulnerable environment, comprising:
- providing the relay, having a load current circuit and connection terminals connected to a supply line, the supply line having explosion protected separation contacts to separate the load current circuit during operation of the relay;
- opening the explosion protected separation contacts;
- and
- disconnecting the connection terminals from the supply line, wherein a lock is provided to prevent the disconnection of the connection terminals from the supply line when the explosion protected separation contacts are closed the lock includes a pin part equipped with an arm having an angled end engaged in an opening of a device housing in the closed state of the separation contacts and therefore preventing the release of the relay assembly.
1 more element
Dependencies are inferred from the claim text.