A technology for making the heat load on an electronic component attached to a target object smaller than before is provided. The electronic component includes a main body, the main body including an electronic component unit adapted to generate an electrical signal and click feeling in accordance with rotation of an engaged portion, a shaft support having a cylindrical portion to be inserted into a through-hole formed in the target object, and a retaining member; and a control shaft made of metal and capable of rotating the engaged portion, the control shaft being inserted into the cylindrical portion after a reflow soldering process of the target object is completed, and being engaged with the engaged portion. The control shaft inserted into the cylindrical portion is retained by the retaining member.

A disconnector for photovoltaic applications having at least two modular contact boxes, each contact box having a box-like body coupled to a contiguous box-like body of a contiguous modular contact box. The box-like body forms a central seat that accommodates a rotatable contact and two peripheral seats, each of which accommodates a connection portion of a corresponding fixed contact that can be accessed from the outside of the modular contact box. The rotatable contact is able to rotate about the axis of the central seat with respect to the box-like body in order to engage the fixed contacts arranged with their connection portion in the peripheral seats or to disengage from the fixed contacts.

A disconnector for photovoltaic applications having at least two modular contact boxes, each contact box having a box-like body coupled to a contiguous box-like body of a contiguous modular contact box. The box-like body forms a central seat that accommodates a rotatable contact and two peripheral seats, each of which accommodates a connection portion of a corresponding fixed contact that can be accessed from the outside of the modular contact box. The rotatable contact is able to rotate about the axis of the central seat with respect to the box-like body in order to engage the fixed contacts arranged with their connection portion in the peripheral seats or to disengage from the fixed contacts.

An electronic circuit arrangement for use in an explosive area may include an electrical signal line, which connects an electrical input connector to an electrical output connector, and an electrical earth line, which can be or is electrically connected to the electrical signal line by at least one electrical earthing line. An inductive component and a semiconductor switch may be arranged in the at least one earthing line. The semiconductor switch may be switched between a closed state, in which the signal line is electrically connected via the at least one earthing line to the earth line, and an open state, in which this electrical connection is interrupted.

A door lock includes a latch device and inner and outer operating devices operatively connected to the latch device. The inner operating device includes a control module and a first battery module electrically connected to the control module and supplying electricity for operation of the door lock. A detecting module is electrically connected between the first battery module and the control module. The outer operating device includes a first electric connecting device electrically connected to the detecting module and an unlocking information input module electrically connected to the control module. When the remaining electricity of the first battery module detected by the detecting module is lower than a preset alarm value and a second electric connecting device of a mobile device is in electrical connection with the first electric connecting device, the second battery module of the mobile device supplies electricity to the door lock for operation.

A phase sequence switching device for a three-phase power supply is disposed in a power feed path from a three-phase power supply to a load and includes a power-supply side relay including two Form C contact relays connected to two phases of the power supply respectively, a load side relay including two Form C contact relays connected between the power-supply side relay and the load, and a switching circuit connected between the power-supply side relay and the load side relay and wired to be capable of switching by a relay action from a standby state where no power is supplied to the load to either a state where the power supply is connected to a positive phase so that power is supplied to the load side or a state where the power supply is connected to a reverse phase so that power is supplied to the load side.

Described are devices for automatically adapting electrical polarity from a power source to a specified output polarity for use by an electrical load. In one implementation, power adaptation circuitry comprising one or more bridge circuits accept electrical power of unspecified polarity and output specified polarity. The bridge circuit may comprise a plurality of field-effect transistors (FETs) configured such that a particular subset of the FETs are energized to conduct electric current to the outputs when a particular polarity is applied at inputs.

An electrical switch including a frame, a first stationary contact, a second stationary contact, a roll element and a movable contact mounted to the roll element. The roll element is rotatable around a rotation axis between a first position and a second position relative to the frame. The movable contact includes a first contact portion and a second contact portion. In the first position of the roll element, the movable contact electrically conductively connects the first stationary contact to the second stationary contact, and in the second position of the roll element the first stationary contact is electrically disconnected from the second stationary contact. The first in contact portion and the second contact portion are located on opposite sides of a centre plane perpendicular to the rotation axis.

Implementations of the subject matter described herein provide a switching apparatus. The switching apparatus includes: a switching component including a first main shaft, which is adapted to selectively connect and disconnect at least one circuit in response to the rotation of the first main shaft; and an operating mechanism including a second main shaft for actuating the first main shaft to rotate via the second main shaft; wherein the switching component further includes a first interface, and the operating mechanism further includes a second interface, and the second main shaft to be detachably coupled to the first main shaft in response to the engagement of the first interface and the second interface.

The electrical switch includes three fixed contacts and a rotatable knife contact being connected with a permanent electrical connection to a third one of the fixed contacts and including at least one pair of longitudinal blades. The rotatable knife contact connects in a first switching position only a first one and a third one of the fixed contacts electrically together, and in a second switching position only a second one and a third one of the fixed contacts. The rotatable knife contact connects further in a zero switching position the first, the second and the third fixed contact electrically together.