Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/12—Automatic release mechanisms with or without manual release
  • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
  • H01H71/125—Automatic release mechanisms with or without manual release using a solid-state trip unit characterised by sensing elements, e.g. current transformers
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/02—Housings; Casings; Bases; Mountings
  • H01H71/0207—Mounting or assembling the different parts of the circuit breaker

Definitions

• the present invention relates to circuit breakers. More particularly, relates to residual circuit breakers with overload protection with an improved neutral pole kinematic chain.
• a conventional residual current circu it breaker with overcurrent protection (“RCBO”) incl udes si ngle housing configured to provide a miniature circuit breaker (MCB) portion and a residual current (for examp le, a ground fau lt) dev ice (RCD) portion for provid ing combined protection from the risk of electrocution and protection against the risk of an electrica l fire and overcurrent protection of equipment and cables.
• a typical conventional RCBO is of a size of approximately 1 25 mm in height, 1 8 mm in width and 70 mm deep.
• the conventional residual current circuit breaker with overcurrent protection includes a si ngle housing configured to enclose together the kinematic chain of neutral pole and one of the residual current devices. I n a RCBO the kinematic chain of the neutral pole and one of the residual current devices interweave each other.
• the housing is multi-sectional and incl udes an interior wal l d ividing the space within the housing to provide equal or unequal distribution of the space within the RCBO.
• the space constraints in the conventional housing may affect the functional ity of the devices provided within the housing.
• the RC BO's currently in use are complex and difficult to be realized since the kinematic chains of the neutral pole and the residual current device l ie in the same enclosure in the same housing.
• An object of the present invention is to provide a residual circuit breakers with overload protection with an improved neutral pole kinematic chain to avoid interweaving of a kinematic chain of the neutral pole and one of the residual current devices into each other.
• Another object of the present invention is to provide a residual circu it breakers with overload protection with an i mproved neutral pole kinematic chain wh ich overcomes the constraint of space having with conventional RCBO.
• the present invention provides a residual current breaker with overcurrent protection (RCBO), comprising a first housing enclosi ng a m i n iature circu it breaker (MCB) and a second housing separated from the first housing by a main frame.
• the second housing includes a first enclosure for a neutral kinematic chain and a second enclosure for a residual current device.
• the first enclosure and the second enclosure is separated by a secondary frame thereby physically separating neutral pole kinematic chain from a residual current kinematic chain of the residual current device.
• a pin of the MCB protrudes inside the first enclosure of the second housing having the neutral kinematic chain.
• Figure 1 shows a perspective view of a residual current breaker with overcurrent protection (RCBO) with improved neutral pole kinematic chain, having a stable starting position of the working phase of the RCBO;
• RCBO residual current breaker with overcurrent protection
• Figure 2 shows a side view the residual current breaker with overcurrent protection (RCBO) of figure 1 ;
• Figure 3 shows a schematic diagram of the a resid ua l current breaker with overcurrent protection (RCBO) i l lustrating an intermediate position of the working phase of the RCBO;
• Figure 4 shows a schematic d iagram of the residual current breaker with overcurrent protection (RCBO) i l l ustrati ng the stable end ing position of the working phase of the RCBO;
• Figure 5 shows a right side view of the residual current breaker with overcurrent protection RCBO, i l lustrati ng the separate enc losures in the second housing provided for the neutral pole and the residual current device and the secondary frame, in accordance with an embod iment of the invention;
• Figure 6 shows a front view of the residual current breaker with overcurrent protection RCBO i l lustrating a secondary frame, in accordance with an embodiment of the invention; and [0016] Figure 7 shows the secondary frame of the residual current breaker with overcurrent protection (RCBO), used to separate the neutral pole and residual current device in the second housing of the RCBO.
• RCBO residual current breaker with overcurrent protection
• the present invention provides provide a residual circuit breakers with overload protection (RCBO) with an improved neutral pole kinematic chain.
• the RCBO of the present invention avoids interweaving of a kinematic chain of the neutral pole and one of the residual current devices into each other. Further, the RCBO overcomes the constraint of space having with conventional RCBO.
• FIG 1-7 there is shown a residual circuit breakers with overload protection (herein after 'RCBO ' ) with improved neutral pole kinematic chain, in accordance with an embodiment of the invention.
• the RCBO (100) includes a first housing (1A) and a second housing (IB).
• the first housing (1A) encloses a MCB portion and components thereof.
• the second housing (IB) includes a first enclosure (1C) for neutral kinematic chain and a second enclosure (ID) for a residual current device.
• the first housing (I A) and second housings (IB) are separated from each other by means of a main frame (4). Further, the first enclosure (1C) and the second enclosure (ID) are separated by a secondary frame (5) as shown in figure 5.
• the separation ensures that the two kinematic chains i.e. one for the neutral pole and the one for residual current are physically separated, hence overcoming the drawbacks present in the current RCBOs.
• the two kinematic chains of the neutral pole and residual current device act on common components in order to allow the operation of the RCBOs.
• a pin (6) of the MCB in the first housing (1A) protrudes inside the first enclosure (1C) of the second housing (IB) having the neutral kinematic chain.
• a first lever (10) mounted in the first enclosure (1C) and is engaged by the pin (6) of the MCB mounted in the first housing (1A).
• the first lever (10) is rotatable around the axis (11).
• the axis (11) hinges on the main frames (4) and 5.
• the first lever (10) comprises of an elongated slot (13).
• a neutral pole having a neutral contact (18) and a fixed neutral contact (20) in the RCBO must close its contact before the contact closure of the MCB and open its contact after the opening of the contact of the MCB , to avoid any danger.
• the slot (13) provides for a prolonged delay in opening of the neutral phase.
• the first lever (10) is rotatably coupled with an arm (15) which is in turn rotatably coupled with a second lever (16).
• the second lever (16) is rotatable around its axis (17).
• the other end of the second lever (16) is joined to a neutral contact (18).
• the neutral contact (18) is connected to a neutral terminal and faces the fixed neutral contact (20).
• the neutral circuit consisting of neutral contact (18) and the fixed neutral contact (20) may be closed or opened using the second lever (16).
• the second lever (16) is provided with an elongated slot, such that the axis (17) may be housed in the same. This axis (17) extends between the mainframe (4) and the secondary frame (5).
• the RCBO (100) includes a compression spring (25) which acts between the second lever (16) and an external casing of the RCOB (100) so as to force the second lever (16) to move in counter clockwise direction.
• the window W in figure shows a movable contact (21) and a fixed contact (90) of the MCB mounted in the first housing (1 A).
• the window W shows the fixed contact (90) and mobile contact (21) of the MCB mounted in the first housing (I A) are not in contact.
• the neutral contact (18) and the fixed neutral contact (20) is also not established.
• the compression spring (25) push the second lever (16) thus maintaining the disengaged condition between ( 18) and (20).
• FIG. 3 The intermediate non-stable position of the RCBO closure operation is shown in figure 3. Specifically, the pin (6) is moved in a counter clockwise direction along an arched trajectory, as a furtherance of the operator action on the handle of the MCB. The pin (6) is moved to the left thereby rotating the first lever (10) in counterclockwise direction, which in turn moves the arm (15). The arm (15) pushes the second lever (16) in a clockwise direction around the axis (17) so as to close the neutral contact (18) and the neutral fixed contact (20).
• the figure 4 shows ending of the stable position of the RCBO closure operation. Specifically, the pin (6) is moved further to the left, which in turn moves the arm (15) further. This movement pushes the second lever (16) but the movement of second lever (16) along the axis (17) is prevented as the second lever (16) is already engaged to neutral fixed contact (20) through the neutral contact (18). Accordingly, due to the force exerted on the second lever (16), the second lever (16) is forced to slide with respect to its axis (17) owing to the elongated slot (19) through which the axis (17) can move. The rotational point between first lever (10) and the arm (1 ) and the rotational point between arm (15) and the second lever (16) align on the same line.
• the release operation of the RCBO ( 1 00) is driven by two conditions for example , manual release and the automatic release.
• the operator acts on the CB handle causing the pin (6) to move in a rear-ward direction, therefore perform ing the reverse action as described in the previous paragraphs and not descri bed herein again for the sake of brevity of the invention.
• the elongated slot ( 1 3) provides for a certain delay in the opening of the neutral pole (consisting of neutral contact ( 1 8) and neutral fixed contact (20)) ensuring that the phase pole (consisting of the fixed contact (90) and the movable contact (20) of the MCB) disengages before the neutral pole.
• the RCBO ( 1 00) of the present invention avoids interweaving of a kinematic chain of the neutral pole and one of the residual current devices into each other.
• the RCBO ( 100) overcomes the constraint of space having with conventional RCBO.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Breakers (AREA)

Applications Claiming Priority (2)

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Family Cites Families (3)

• 2012
  • 2012-12-26 EP EP12839196.8A patent/EP2798655A2/de not_active Withdrawn
  • 2012-12-26 WO PCT/IN2012/000847 patent/WO2013102933A2/en not_active Ceased

Non-Patent Citations (1)

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