A frame or the like incorporating a removable device for placement on a wallbox. The frame may be attached to a conventional wallbox without modification to the wallbox. The device may be mounted to, in or on the frame. A memory for the device may be situated on or embedded in the frame. If the device fails, it may be easily removed from the frame and replaced with a new or other working device without frame removal from the wallbox. The replacement device may be configured with information in the memory that contained the configuration for the failed device. The memory or the frame holding it may also be replaced if it fails; however, memory failure is rare compared to device failure. Thus, expense may be spared with just a replacement device and an available configuration in the remaining memory. The memory may have a secure trusted platform.

A power management system for selectively providing power to one or more electrical loads using a standby generator includes a meter mounted transfer switch, a power management module, and a controller. The meter mounted transfer switch is configured to receive electrical power from a utility source. The power management module is configured to receive electrical power from each of the standby generator and the utility source. The controller is in communication with the standby generator and the power management module, and monitors a load on the standby generator and communicates to the power management module to selectively disconnect at least one of the one or more electrical loads based on the monitored load.

A power management system for selectively providing power to one or more electrical loads using a standby generator includes a meter mounted transfer switch, a power management module, and a controller. The meter mounted transfer switch is configured to receive electrical power from a utility source. The power management module is configured to receive electrical power from each of the standby generator and the utility source. The controller is in communication with the standby generator and the power management module, and monitors a load on the standby generator and communicates to the power management module to selectively disconnect at least one of the one or more electrical loads based on the monitored load.

A device for controlling a load flow in an alternating-voltage network includes first and second modular series connections of double-pole switching modules interconnected in a parallel circuit to be inserted in series into a phase line of the alternating-voltage network. At least one switching module of each connection has an energy store and semiconductor switches to be switched on and off. The semiconductor switches can be controlled in such a way that a switching module voltage can be generated at terminals of the switching module. The switching module voltage corresponds to a positive or negative storage voltage or a zero voltage. A control apparatus for controlling the switching modules is configured to generate an equalizing current between the modular series connections. A method for controlling a load flow by using the device is also provided.

An apparatus that physically and electrically attaches to an existing AC electrical switch, and controls the power to the electrical load via outputs from the existing electrical switch or from wireless commands from a remote controller.

A hydraulic fracturing system for fracturing a subterranean formation includes a primary switchgear arranged on a support structure. The system also includes a secondary switchgear, arranged on the support structure, the secondary switchgear positioned separately from the primary switchgear and within an enclosure, the secondary switchgear receiving an electrical input from the primary switchgear and including an plurality of feed connections for supplying electrical power to a plurality of fracturing equipment.

A hydraulic fracturing system for fracturing a subterranean formation includes a primary switchgear arranged on a support structure. The system also includes a secondary switchgear, arranged on the support structure, the secondary switchgear positioned separately from the primary switchgear and within an enclosure, the secondary switchgear receiving an electrical input from the primary switchgear and including an plurality of feed connections for supplying electrical power to a plurality of fracturing equipment.

A switching system includes a power switching section, a control module, and a casing. The power switching section includes at least one power transfer switch and a power selector. The power selector opens and closes the at least one power transfer switch. The control module includes one or more supply transfer switches and a supply controller. The supply controller opens and closes the one or more supply transfer switches. The casing houses the power switching section and the control module.

A switching system includes a power switching section, a control module, and a casing. The power switching section includes at least one power transfer switch and a power selector. The power selector opens and closes the at least one power transfer switch. The control module includes one or more supply transfer switches and a supply controller. The supply controller opens and closes the one or more supply transfer switches. The casing houses the power switching section and the control module.

An apparatus provides a single split-bus electrical panel with back-feed circuit breakers arranged to allow connection of a Microgrid Interconnection Device (MID) for isolation of a critical loads section from a standards loads section during back-up operation due to a utility power outage. A first panel section of the split-bus electrical panel supplies power to non-critical standards loads in a residence. A second panel section of the split-bus electrical panel supplies power to critical loads in the residence, which must continue to be powered during a utility power outage.