A boat having an electric motor coupled with an electrical store is disclosed. The electrical store includes a storage element, and positive and negative poles in current-conducting connection with the storage element. An isolating circuit element is operatively connected to a user activatable emergency stop switch. The isolating circuit element is configured to, upon activation of the emergency stop switch, isolate the current-conducting connection between the storage element and at least one of the poles.

The invention relates to an actuator device for change of state of an electronic-control apparatus for underwater use and a system for underwater use comprising the combination of a said actuator device with an electronic-control apparatus for underwater use. The actuator device for change of state of an electronic-control apparatus for underwater use comprises a main body designed to be associated in a stable way with at least part of said apparatus. A peculiarity of the invention is that it comprises, associated with the main body, magnetic-field generator means that interface, in the operating position of the actuator device, with reed-technology sensor means of said apparatus for sending electrical information to means for management and control of the apparatus that are designed to change the state, in particular the state of supply of the apparatus, said management and control means being electrically associated with a supply circuit of the apparatus, which comprises at least one power-supply battery, for the possible opening or closing of the circuit.

A boat having an electric motor coupled with an electrical store is disclosed. The electrical store includes a storage element, and positive and negative poles in current-conducting connection with the storage element. An isolating circuit element is operatively connected to a user activatable emergency stop switch. The isolating circuit element is configured to, upon activation of the emergency stop switch, isolate the current-conducting connection between the storage element and at least one of the poles.

Disclosed embodiments relate to an auxiliary relay of an electronic contactor. In some embodiments, an auxiliary relay has its conducting state controlled by a plurality of lead switches, in a non-exposed state of contact parts to the outside. This may prevent dust or foreign materials from clinging to the contact parts.

A system and a method for fault detection for a liquid level sensing device are provided. The liquid level sensing device comprising a plurality of switches arranged to measure variance in a liquid level. A sensing signal comprising a plurality of measurements indicative of the liquid level is received from the liquid level sensing device. Each measurement is obtained in response to one or more of the plurality of switches being in a given position at a given liquid level. It is determined, based on the sensing signal, whether the liquid level changed according to one or more expected change patterns. A fault signal is output in response to determining that the liquid level changed according to an abnormal change pattern.

A safety switch includes an actuator that has a first possible actuator position and a second possible actuator position and a blocker that has a first possible blocker position and a second possible blocker position. The first possible blocker position overlaps with the second possible actuator position. The safety switch includes a device for generating an electrical signal representative of a current position of the actuator. When the actuator is in the first possible actuator position and the blocker is in the first possible blocker position, the blocker prevents movement of the actuator from the first possible actuator position to the second possible actuator position without first moving the blocker from the first possible blocker position to the second possible blocker position.

The invention relates to an actuator device for change of state of an electronic-control apparatus for underwater use and a system for underwater use comprising the combination of a said actuator device with an electronic-control apparatus for underwater use. The actuator device for change of state of an electronic-control apparatus for underwater use comprises a main body designed to be associated in a stable way with at least part of said apparatus. A peculiarity of the invention is that it comprises, associated with the main body, magnetic-field generator means that interface, in the operating position of the actuator device, with reed-technology sensor means of said apparatus for sending electrical information to means for management and control of the apparatus that are designed to change the state, in particular the state of supply of the apparatus, said management and control means being electrically associated with a supply circuit of the apparatus, which comprises at least one power-supply battery, for the possible opening or closing of the circuit.

A portable object including a near-field communication device. The communication device includes an antenna, the ends of which are configured to be connected electrically to an electronic chip, forming, together with the chip, an electrical circuit. In an original manner, the portable object includes a control element which is able to be displaced between two predefined positions, i.e. an active position wherein the communication device is activated and a passive position wherein the communication device is deactivated. The portable object includes, furthermore, a mechanical switch which is able to switch between an open state and a closed state in response to a displacement of the control element from one to the other of its predefined positions.

An electronic device comprising a lens and a selector ring is disclosed. The selector ring is mounted for rotation about the lens and comprises a plurality of tabs projecting inwards towards the lens which engaging with and are held within a tab receiving groove comprising a plurality of spaced notches. Each of the notches is dimensioned to receive one of said tabs. A wave spring positioned between an annular ledge of the lens and the selector ring which biases the plurality of tabs against the groove and such that when each of the plurality of tabs is positioned adjacent a respective one of the notches, the tabs are biased into the notches thereby preventing said selector ring from being rotated. A user disengages the tabs from the notches by pressing said selector ring against the bias of the wave spring, thereby allowing the selector ring to be rotated.

A method for charging an auxiliary voltage source that provides power for at least one additional component, the additional component being in addition to an electric drive that is powered by a main voltage, is described. The method includes electrically connecting a protection and/or control circuit to the main voltage source via a DC-to-DC converter configured for power supply, and to the auxiliary voltage source via a reverse blocking valve. The method further includes electrically connecting the main voltage source to the auxiliary voltage source via a charging device. The method still further includes charging the auxiliary voltage source via the main voltage source.