Abstract:
The invention relates to an arrangement for attaching a switch (2) control shaft (1) to a switch (2) pipe shaft (3), where the control shaft (1) is mounted partly in the switch (2) pipe shaft (3) and tightened to the switch (2) pipe shaft (3) by a screw (4). The arrangement comprises a tightening piece (6). The screw (4) is arranged to act on the control shaft (1) through the tightening piece (6) so that when the screw (4) is turned, the tightening piece (6) is arranged to press the control shaft (1) against the pipe shaft (3) so that the control shaft (1) tightens fast between the tightening piece (6) and the pipe shaft (3).
Abstract:
An electric switch, comprising a movable contact (108, 10, 112) and a stationary contact (104, 106) for being contacted by the movable contact(108, 110, 112), the switch further comprising one or more quenching plates (122), and a permanent magnet (132) for directing an arc, that is formed when the contacts are separated from each other, to the quenching plate (122).The quenching plate (122) has a base portion (464) and side portions (468, 470) extending away from the base portion (464), and the permanent magnet (132) is arranged such that the arc is directed towards one of the side portions (468, 470) of the quenching plate (122).
Abstract:
A switching device module comprising a frame (2), the switching device module being adapted to be connected to another switching device module for providing a modular switching device. The frame (2) of the switching device module is provided with one or more wire troughs (8), each of which is adapted to receive at least one wire of an auxiliary circuit of said modular switching device.
Abstract:
The present publication discloses a fuse unit for holding a fuse (6) and comprising a body part (1) and contact means (2, 4) for coupling a fuse (6) mounted in the fuse unit to an external circuit. According to the invention, the fuse unit comprises a slidable fuse carrier (5) compressive-force-exerting means (5) and locking means (7, 8), adapted to operate so that the slidable fuse carrier can be withdrawn into a rear position against the compressive-force-exerting means (7, 8) and respectively can be released from this rear position and that, in its released position, the slidable fuse carrier (3) is adapted to cooperate with the compressive-force- exerting means (5) so as to establish a contact pressure between the fuse (5) and the contact means (2, 4). The fuse unit according to the invention features easy replacement of the fuse and facilitates manual fuse replacement operation without tools. Moreover, the springed contact loading of the slidable fuse carrier (3) assures a sufficiently high contact pressure.
Abstract:
The invention relates to a method and an arrangement for determining an end-of-life of an overvoltage protection element (2) by determining (101) a predefined voltage limit based on a nominal voltage, determining (102) a measuring voltage across switch components (5) of the switch arrangement in connection with a switch-off event, and determining (103) that the overvoltage protection element (2) has reached its end-of-life when the measuring voltage is equal to or lower than the predefined voltage limit.
Abstract:
A semiconductor switch arrangement comprising for each current phase a first and a second semiconductor switch (2a, 2b), a first and a second diode (3a, 3b), means for measuring voltages from input and output lines of said semiconductor switch and means for measuring current (8) arranged in series with said semiconductor switch. Additionally, the arrangement comprises a control element (14) configured to switch on the semiconductor switch arrangement at zero-voltage point and to switch off the semiconductor switches at zero-current point.
Abstract:
The invention relates to an electric switch mounting arrangement comprising a housing (102) and a stationary contact (110, 112) to be mounted to an aperture (103, 203) in a wall of the housing(102). The arrangement comprises compensation means within the interior area of the aperture (203) for allowing stationary contacts of two different sizes (110, 210, 310) to be mounted to the aperture (103, 203), which compensation means comprises one or more projections (109, 209) formed on the housing (102) or the stationary contact and/or one or more recess- es (318) formed on the housing (102) or stationary contact for receiving the one or more projections.
Abstract:
The invention relates to a fastening arrangement for fastening a switching device to a mounting tray, the fastening arrangement comprising a fastening point (12) formed in the switching device or the like, and a lug (10) to be fastened to the fastening point (12). The fastening point comprises at least three recesses (16) to receive the protrusion (24) in the lug (10) in such a way that the lug (10) is optionally lockable, when being fastened to the switching device, to different positions defined by the recesses (16), one of the positions being a substantially vertical position, another being a substantially horizontal position, and the rest being positions at an angle between these positions.
Abstract:
A contact arrangement of an electric switch, comprising a first stationary contact (110), a second stationary contact (112) and a movable contact (130) for making an electrical connection between the first (110) and second (112) stationary contacts, wherein the movable contact (130) is pivotally connected to the first stationary contact (110) by a pivotal connection for allowing the movable contact (130) to pivot with respect to the first stationary contact (110) about a pivoting axis (116, 135) such that in an open position of the switch, the movable contact (130) is disconnected from the second stationary contact (112), and in a closed position of the switch, the movable contact (130) is in contact with the second stationary contact (112).The movable contact (130) and the first stationary contact (110) are arranged in a first angle with respect to each other in the open position of the switch, and in a second angle with respect to each other in the closed position of the switch, and the second angle is greater than the first angle.
Abstract:
The invention relates to a movable contact for an electric switch, comprising a first contact blade (131) and a second contact blade (132). Each of the first contact blade (131) and the second contact blade (132)comprises an assembly hole (132A), the movable contact comprising an assembly pin (138) wherein the assembly pin (138) comprises a separation portion (138A) having a diameter greater than the assembly holes (132A) of the first (131) and second (132) contact blades thereby keeping the first (131)and second (132) contact blades separated from each other, the assembly pin (138) comprising a contact blade portion (138B, 138C) on each side of the separation portion (138A) for insertion to the assembly holes (132A) of the contact blades (131, 132).