A sealing assembly for mating two sections of an electrical device enclosure is disclosed. The enclosure includes a top and bottom joinable section. The sealing assembly includes a first sealing section disposed on the top joinable section that has both first and second upper projecting lip extensions. The second upper projecting lip extension has a height less than the first upper projecting lip extension and forms a channel therebetween. A second sealing section is disposed on the bottom joinable section, and includes a downward projecting lip extension and channel. The downward projecting lip extension is offset from the first section first upward projecting lip extension when the top and bottom joinable sections are joined. At that point the downward projecting lip extension engages within the channel of the first sealing section, and the second upper projecting lip extension of said first sealing section is engaged within the second sealing section channel. The second sealing section channel can include a compressible gasket for waterproofing.

A sealing assembly for mating two sections of an electrical device enclosure is disclosed. The enclosure includes a top and bottom joinable section. The sealing assembly includes a first sealing section disposed on the top joinable section that has both first and second upper projecting lip extensions. The second upper projecting lip extension has a height less than the first upper projecting lip extension and forms a channel therebetween. A second sealing section is disposed on the bottom joinable section, and includes a downward projecting lip extension and channel. The downward projecting lip extension is offset from the first section first upward projecting lip extension when the top and bottom joinable sections are joined. At that point the downward projecting lip extension engages within the channel of the first sealing section, and the second upper projecting lip extension of said first sealing section is engaged within the second sealing section channel. The second sealing section channel can include a compressible gasket for waterproofing.

The present invention relates to a circuit breaker (20, 40) comprising a handle (33) connected to a switching and trip mechanism (25) in the base unit (20a), and capable of opening and closing a system (24) of electrical contacts in normal operation, ensuring the interchangeability between a pluggable electronic trip module (20b) and/or a pluggable thermomagnetic trip module (20b), using the same structural base unit (20a). The device comprises a main electric circuit 1 and a secondary circuit 2 or 2b, wherein the main circuit 1, using a current transformer (29) in the base unit (20a) which converts a current flowing in the main circuit 1 of the power line (23) to power the secondary circuit 2 or 2b, issues a trip command to protect the main circuit 1, opening the contact system (24) when predefined current limits are exceeded.

A device with a combined unbalanced current sensor and solenoid coil is provided. The device includes a core (116). The core (116) comprises a ferromagnetic material. The core (116) substantially surrounds a first conductor (102) and a second conductor (104) that conduct power to and from a load (106). The device includes a coil (118) that is wrapped around at least a portion of the core (116), such that an unbalanced current between the first and second conductors (102, 104) creates a first magnetic field that induces a first voltage on the coil (118). The coil (118) is positioned adjacent to a mechanical action part (124), such that application of a second voltage to the coil (118) creates a second magnetic field that influences the mechanical action part (124) to move from a first position to a second position that electrically disconnects the load (106) from a power source, such that the coil (118) serves as both an unbalanced current sensor coil and a solenoid coil.

A circuit breaker protects an electric low-voltage circuit, and has the function of ascertaining a level of the current of the low-voltage circuit. A mechanical separating contact unit is operated using a mechanical handle such that an opening function of contacts is switched to prevent a current flow or a closing function of the contacts is switched for a current flow in the low-voltage circuit. An electronic interruption unit is connected to the mechanical separating contact unit in series on the circuit side and which, as a result of semiconductor-based switch elements, has a high-ohmic state of the switch elements to prevent a current flow and a low-ohmic state of the switch elements for a current flow in the low-voltage circuit. The ascertained current level is compared with current thresholds and if the current thresholds are exceeded, a process for preventing the current flow in the low-voltage circuit is initiated.

A circuit breaker protects an electric low-voltage circuit, and has the function of ascertaining a level of the current of the low-voltage circuit. A mechanical separating contact unit is operated using a mechanical handle such that an opening function of contacts is switched to prevent a current flow or a closing function of the contacts is switched for a current flow in the low-voltage circuit. An electronic interruption unit is connected to the mechanical separating contact unit in series on the circuit side and which, as a result of semiconductor-based switch elements, has a high-ohmic state of the switch elements to prevent a current flow and a low-ohmic state of the switch elements for a current flow in the low-voltage circuit. The ascertained current level is compared with current thresholds and if the current thresholds are exceeded, a process for preventing the current flow in the low-voltage circuit is initiated.

A circuit breaker protecting an electric low-voltage circuit includes a housing with grid-side and load-side connections and a series circuit of a mechanical isolating contact unit on the grid side and an electronic interruption unit on the load side. The mechanical isolating contact unit has a handle opening and closing contacts. A current sensor unit is disposed in a conductor between the isolating contact unit and the interruption unit, for ascertaining a current level of the low-voltage circuit. A control unit is connected to the current sensor unit, electronic interruption unit, and mechanical isolating contact unit. When current and/or current/time thresholds are exceeded, prevention of a current flow in the low-voltage circuit is initiated. A power supply unit supplying energy to the circuit breaker is connected to conductors of the low-voltage circuit between the isolating contact unit and the interruption unit.

A residual current device (RCD) comprises test circuitry which issues intermittent first test pulses each simulating a residual current fault for which a corresponding fault signal is generated. In the case of a fault in which a corresponding fault signal is not received in respect of a first pulse, the RCD attempts to force the load contacts open. The test circuitry further issues intermittent second test pulses at a frequency less than that of the first test pulses, each second test pulse simulating a residual current for which a corresponding fault signal is generated. The duration of each corresponding fault signal is greater than the response time of the load contacts to allow the load contacts to open. If the test circuitry detects that the load contacts do not open, the RCD attempts to force the load contacts open.

An apparatus and a method are provided to block and unblock a breaker handle of a circuit breaker having main contacts. The apparatus comprises a locking mechanism including a locking handle shaft and a locking latch. The locking handle shaft is configured to latch the locking mechanism for keeping the breaker handle in a mid-position in which the main contacts stay open. The locking handle shaft has a latching surface configured to be removed from its position in order to rotate the breaker handle to a fully ON position in which the main contacts fully close. The locking latch is configured to prevent rotation of the locking handle shaft. The locking latch is configured to engage and disengage with the locking handle shaft in order to rotate the breaker handle from a reset position to the mid-position in which the locking mechanism locks the breaker handle rotation thus preventing the main contacts from closing. The breaker handle is stopped at the mid-position by the locking mechanism until a self-test is passed.

A ground fault circuit interrupter (GFCI) can include a current transformer (CT) comprising a single core, a first winding wound around the single core, and a second winding wound around the single core. The GFCI can include a ground fault (GF) detection module operatively connected to the first winding to receive signals from the first winding and configured to determine whether a line-to-ground fault exists. The GFCI can also include a GN stimulus operatively connected to the second winding to provide a GN stimulus signal to the second winding. The GFCI can also include a grounded neutral (GN) detection module operatively connected to second winding and configured to receive signals from the second winding to determine whether a neutral-to-ground fault exists.