Abstract: A switching device for the protection of direct current devices such as accumulators, direct current machines and direct current devices, against for example excess current, excess temperature and low tension voltage.The switching device comprises first and second excess current switches. The first switch comprises a break point and a thermal and/or electromagnetic tripping device and the second switch comprises a break point and an electromagnetic tripping device having a high resistance coil. The break point of the first switch is connected in parallel with the tripping device of the second switch. When an excess current occurs, the break point of the first switch opens, leaving the tripping device of the second switch in circuit and this opens the break point of the second switch.The device further includes an electronic control circuit having at least one transducer for monitoring changes in at least one parameter of the direct current device to be protected.

Abstract: An excess current switching device having particular but not exclusive application in switching direct current power.The switching device comprises first and second excess current switches. The first switch comprises a break point and a thermal and/or electromagnetic tripping device(s) linked to a latching mechanism and the second switch comprises a break point and an electromagnetic tripping device having a high resistance coil linked to a latching mechanism. The break point of the first switch is connected in parallel with the tripping device of the second switch. When an excess current occurs, the break point of the first switch opens, leaving the tripping device of the second switch in curcuit and this opens the break point of the second switch.

Abstract: This invention relates to a push-button operated bipolar, faulty current protective switch, with a trip-free release and a switched-on position that is not affected by the push-button.Such a circuit breaker includes a bell crank and a switching bar which is controlled by an electromagnetic tripping device.

Abstract: This invention relates to an excess current switch. Such a switch includes a housing, a contact bridge, a bimetal strip for providing a thermal trip, switch actuating means and a slide bar. These components are arranged in a simple and space saving manner to allow the switch to be used as an ON/OFF switch which retain the characteristics of instantaneous switching ON and OFF and trip free release.