US2144475A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US2144475A
US2144475A US164142A US16414237A US2144475A US 2144475 A US2144475 A US 2144475A US 164142 A US164142 A US 164142A US 16414237 A US16414237 A US 16414237A US 2144475 A US2144475 A US 2144475A
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United States
Prior art keywords
contact
breaker
contacts
open
movable
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Expired - Lifetime
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US164142A
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English (en)
Inventor
Wulsten Kurt
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CBS Corp
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Westinghouse Electric and Manufacturing Co
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    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/527—Manual reset mechanisms which may be also used for manual release actuated by lever making use of a walking beam with one extremity latchable, the other extremity actuating or supporting the movable contact and an intermediate part co-operating with the actuator
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/58—Manual reset mechanisms which may be also used for manual release actuated by push-button, pull-knob, or slide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • 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
    • H01H2071/0292—Housing or frames containing grooves or slots for guiding movable parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/0253—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch two co-operating contacts actuated independently
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts

Definitions

  • WITNESSES yf MM Patented Jah. 17, 1939 UNITED STATES PATENT OFFICE CIRCUIT BREAKER Application September 16, 1937, Serial No. 164,142 In Germany September 11, 1936 18 Claims.
  • the invention relates to electrical circuit controlling devices, in general, and'more particularly, to circuit breakers of the type which are manually operable to open and to close the circuit and automatically operable to open the circuit in response to predetermined overload or fault conditions, and which are used for controlling lighting and moderate power industrial feeder circuits.
  • Another object of the invention is the provision of a circuit breaker embodying an improved actuating and coacting tripping means for effecting a very rapid circuit interruption.
  • the general arrangement for carrying out this feature of the invention consists in providing a spring directly engaging the switch member for biasing the same toppen position, an actuating means for opening and closing the switch member which includes a spring means for securing pressure engagement of the contacts when the breaker is closed, and a trip member normally connecting the actuating and contact pressure securing spring means to the switch member, which is operable in response to predetermined conditions to disconnect the actuating and contact pressure securing spring means from the switch member to permit opening of the same by its biasing spring.
  • an improved arc-extinguishing structure is provided for quick- 1y extinguishing the arc drawn between the contacts.
  • circuit breaker In addition to the previously mentioned requirements, for a circuit breaker to be commercially successful, it must be safe in operation, compact in structure, inexpensiveV to manufacture and its parts readily accessible for servicing.
  • Another ⁇ object of the invention is the provision of an improved circuit breaker which will satisfactorily meet all of the previously mentioned requirements.
  • Another object of the invention is the provision of a circuit breaker embodying an improved arcextinguishing structure.
  • Another object of the invention is the provision of a circuit breaker in which the operating mechanism and contact means are assembled as a unit, removably mounted on the breaker base, and readily accessible for servicing.
  • Another object of the invention is the provision of a circuit breaker in which the insulating base for supporting the breaker is formed to provide an enclosed interrupting chamber for the contacts, thus eliminating the necessity of a separate structure for this purpose.
  • Figure 1 is a side View, partly in section and partly in elevation, of the circuit breaker embodying the features of the invention
  • Fig. 2 is a vertical sectional view of the circuit breaker illustrated in Fig. 1;
  • Fig. 3 is a plan view of the circuit breaker with the cover removed;
  • Fig. 4 is an end View partly in elevation and partly in section, of the circuit breaker
  • Fig. 5 is a plan View of the base of the circuit breaker
  • Fig. 6 is a plan view of one of the arc-extinguishing plates
  • Fig. '7 is a plan view of the winding spool for vthe electromagnetic blowout and trip means
  • Fig. 8 is a diagrammatic view illustrating the electrical connection of the windings of the aforementioned electromagnetic means to the contacts of the breaker;
  • Fig. 9 is a schematic view of a modification of the invention.
  • Fig. 10 is a schematic view showing the contact means and actuating means of the embodiment shown in Fig. 1 in the manually open position of the breaker;
  • Fig. 11 is a view similar to Fig. 10 showing the contact means and actuating means in the manually closed position of the breaker;
  • Fig. 12 is a view similar to Fig. 10 showing the position of the parts immediately following release of the trip latch during a tripping operation of the breaker;
  • Fig. 13 is a horizontal sectional view of the circuit breaker taken substantially on the line XIII- XIII of Fig. 2.
  • the circuit breaker illustrated comprises, in general, relatively movable contact means indicated generally at I5, actuating means therefor indicated generally at I1, a trip latch member I9, which serves to releasably connect the actuating means to the contact means, an electromagnetic means indicated generally at l2
  • the aforementioned elements are all assembled together and to a main frame 25 of inverted U-shape, to form a unitary breaker assemblage which is adapted to be removably mounted on a base 21 of insulating material.
  • a cover 29 also of insulating material is provided for enclosing and protecting the unitary breaker assemblage, the cover being secured to the assemblage by means of a screw 3
  • the contact means of the breaker comprises a pair of spaced stationary contacts 33 and a movable bridging contact 35.
  • the stationary contacts 33 are carried by bolts 31 which engage internally threaded conducting sleeves 38 embedded in an insulating body 39 which forms a winding spool for the windings of the electromagnetic means.
  • 'I'he movable bridging contact 35 is secured to the lower end of an operating rod 4I which is mounted for vertical sliding movement in a vertical opening provided therefor in the insulating body 39.
  • the upper end of the operating rod 4I is pivotally connected by means of a pin 43 to a contact lever 45 which is pivotally mounted on a main pivot pin 41 carried by the frame 25.
  • the operating rod 4I and movable bridging contact 35 carried thereby are biased in a downward direction to open position by means of a coil compression spring 49 surrounding the rod 4I.
  • the upper end of the spring engages a vertical insulating sleeve 42 provided in the core of the electromagnetic means, while the lower end thereof engages an insulating sleeve 5I mounted on the lower portion of the rod 4I.
  • actuating means for the breaker comprises, in general a manually operable handle 53, a pair of toggle links 55 and 51, a pair of pivoted bell crank levers 59 and a spring means 6I for securing a pressure engagement of the contacts in the closed position of the switch.
  • the operating handle is pivotally mounted on the main pivot pin 41 and is biased in a clockwise direction by a spring 54.
  • the handle 53 is provided with an operating knob 63 which projects through a Suitable opening 65 provided therefor in the cover 29.
  • the toggle link 55 which is U-shaped, is also pivotally mounted at one end on the main pivot pin 41 and its legs are provided with angular extensions 61 which carry a transverse pin 69.
  • the pin 69 extends through a slotted opening 1I formed in the handle 53, the slotted opening 1I and the pin 69 forming a lost motion coupling means between the handle 53 and the toggle link 55.
  • the lower toggle link 51 which is U- shaped, is pivoted at its upper end to the lower end of the toggle link 55 by means of a knee pivot pin 13.
  • the two bell crank levers 59 which are mounted on opposite sides of the frame 25, are pivoted to the side walls of the main frame by means of the pivot screws 15 (Fig. 1).
  • the right-hand arms of the bell crank levers 59 are secured for movement together by a transverse pivot pin 11 and this pin 11 engages slotted openings 19 provided therefor in the legs of the lower toggle link 51.
  • the bell crank levers 59 are Vthus coupled at their one ends to the lower toggle link 51.
  • the contact pressure securing spring means BI consists of a coil tension spring, the upper end of which is secured to the transverse pivot pin 11,
  • the actuating means ofthe circuit breaker is adapted to be releasably connected to the contact means and operating rod 4I by means of the floating trip latch member I9.
  • the latch member I9 comprises a plate 8
  • the opposite ends of the transverse pin 83 engage vertical slots 81 provided therefor in the side walls of the frame 25 so that the latch member I9 is mounted for vertical movement.
  • the left-hand ends of the bell crank levers 59 are provided with horizontal slots 89 in which the extended end portions of the transverse pin 83 engage to couple the bell crank levers 59 to the latch member I9.
  • the latch member I9 is biased in a clockwise direction about the pivot pin 83 by means of the weight and position of the latch plate 85 and/or a suitable spring means (not shown) and the free end of the lever 45 is adapted to normally engage the upper edge of the latch plate 85 as shown in Fig. 2.
  • the latch member I9 normally couples the actuating means I1 to the contact operating lever 45 and operating rod Il.
  • the magnetic portion of the latch member I9 cooperates with the electromagnetic means 2
  • the thermally responsive trip element 23 which consists of a strip of bimetallic material secured at its upper end to the frame 25 and connected in circuit with the contact means of the breaker.
  • the lower free end of the trip element 23 is provided with an adjustable screw 88 for engaging and moving the lower' end of the latch member I9 when the trip element is heated a predetermined amount in response to an overload condition.
  • the trip element 23 is adapted It will thus to flex toward the actuating mechanism when heated by overloads of predetermined magnitude and duration to engage and move the latch member I9 in a counter-clockwise direction to effect release of the contact lever 45 and opening of the contact means of the breaker.
  • magnitude overloads and short circuit conditions comprises a core of magnetic material, a pair of spaced pole pieces 9
  • the core member 90 is mounted within and extends through a hollow hub portion (Figs. 7 and 13) of the insulating body 39 and its ends are s'ecured to the pole pieces 9
  • the insulating body 39 is provided with a central portion 91 and a pair of end discs 99.
  • the central portion 91 of the insulating body 39 is provided with a vertical opening
  • the core member 90 is also provided with a vertical opening aligned with the opening IDI for' receiving the operating Irod 4
  • the two windings 93 are wound upon the hub portion 95 of the body 39 on opposite sides of the central portion 91 and between the end discs 99. l
  • are of inverted L-shape and extend downwardly on opposite sides'of the contacts 33 and 35, and are secured to the opposite ends of the core 90 outside the discs 99.
  • are centrally notched, as indicated at
  • This structure of the lower end of the pole pieces concentrates and increases the flux density across the interrupting gaps so as to increase the force which acts to move the arcs outwardly.
  • form pole shoes for cooperating with the lower end of the magnetic plate 8
  • the path taken by the current during circuit interruption is substantially U-shaped, due to the structure of the contacts, so that the magnetic field produced by the current flow through this path. also tends to move the two arcs outwardly in opposite directions from one another.
  • windings 93 are each separately connected to one of the stationary contacts 33 so that the two gaps As has previously been ⁇ 'biasing influence of the opening spring are located between the windings 93.
  • the end of one of the windings 93 is adapted to be connected to one of the end terminals of the breaker, while the end of the other winding 93 is adapted to be connected in series circuit with the thermally responsive bimetallic trip element 23 and to the opposite end terminal of the breaker through suitable connecting means.
  • the operating handle 53 To manually close the contact means of the breaker the operating handle 53 is moved in a clockwise direction about its pivot axis 41. Since the transverse pin 59 is in engagement with the upper end of the slot 1
  • the contact pressure spring 6I exerts a downward force on the transverse connecting pin 11 carried by the bell crank lever 59, and this force is transmitted to the movable bridging contact through the agency of the trip latch member I9, contact lever 45 and operating rod 4
  • the bimetallic trip element 23 is heated a suiicient amount to ilex and move the trip latch member I 9 in a counter-clockwise direction about its pivot axis 83. This movement of the trip latch member releases the contact lever 45 or disconnects it from the actuating means of the breaker so as to permit movement of the contact lever 45, operating rod 4
  • the bell crank levers 59 are moved in a clockwise direction about their pivot axes 15 by the spring 6
  • the base 21 of the circuit breaker is of ceramic insulating material and is provided with recesses at each end for accommodating the end terminal bolts
  • the base may be composed of molded insulating material instead of ceramic material.
  • the inner ends of the terminal lugs I I I are bifurcated, as indicated in Fig. 2, to engage the-bolts
  • the base 21 of the breaker is provided with a relatively deep main recess I I9 (Fig. 5) the centrol portion of which forms an interrupting chamber for thecontact means as shown in Fig. 2.
  • the base 21 is also provided with a pair of pole shoe receiving recesses
  • serve to receive the pole shoes
  • the previously described breaker unit assemblage is adapted to be removably mounted on the base 21 so that the contact means is disposed in the main interrupting recess or chamber
  • 23 (Figs. 1 and 4) which extend upwardly through suitable openings provided therefor in the base member.
  • 23 extend through suitable restricted openings
  • 21 are provided in the pole pieces 9
  • 21 may be of irregular or square shape so as to prevent the fastening nuts
  • (Fig. 2) are provided for closing the open side of the interrupting chamber
  • are secured to the unitary breaker assemblage by means of the bolts 31 and the stationary contacts 33, so that when the unitary breaker assemblage is mounted in position on the base 21 the plates
  • are provided With a suitable opening for receiving the operating rod 4
  • the provision of the closed chamber about the contact means of the breaker aids in extinguishing the arc drawn between'the contacts during circuit interruption, the pressure developed by the arc tending to quench the same.
  • Additional arc-extinguishing means are provided in the chamber
  • the additional arcextinguishing means comprises a plurality of spaced and insulated arc-extinguishing plates
  • moves the arcs drawn between the stationary contacts 33 and the movable bridging contact 35 in opposite directions into the spaces between the plates
  • 35 are provided opposite the ends of the arc-extinguishing plates
  • FIG. 9 A modification of the invention is illustrated in Fig. 9.
  • This modified form of circuit breaker comprises a stationary contact
  • 45 is provided for biasing and moving the switch arm
  • the actuating means for the switch arm comprises a toggle type operating handle
  • 55 is pivotally mounted on a tlxedpivot pin
  • 55, and through it the actuating means of the breaker, is releasably connected to the switch arm
  • a stationary contact movable to open and to closed position, means biasing said movable contact to open position, actuating means for eiecting movement of the movable contact to open and tof closed position, means for securing a pressure engagement of said contacts in the closed position of said movable contact, and trip means operable to immediately release said contacts from said contact pressure securing means and said actuating means to cause opening of said contacts independently of the influence of said actuating means and said contact pressure securing means.
  • a pair of rigidly mounted separable contacts an operating member, connecting means for moving one of said contacts upon movement of said operating member, means applying a biasing force to said connecting means adjacent said movable'contact for moving it to open position, means applying a biasing force to said connecting means remote from said movable contact for supplying contact pressure, and electro-responsive releasable means in soI said connecting means intermediate said two biasing means.
  • a switch member movable to open and to closed position to open and to close said contacts, means biasing said switch member to open position to quickly open said contacts, actuating means for moving the switch member to open and to closed position including a toggle and a means for securing pressure engagement of the contacts in the closed position of the contacts, trip means for immediately freeing said switch member from the influence of said actuating means and pressure securing means to cause separation and opening of said contacts independently of the position of said actuating means and pressure securing means.
  • a fixed contact In a circuit breaker, a fixed contact, a cooperating movable contact movable to open and to closed position, means biasing said movable contact to open position, actuating means for moving said movable contact to open and to closed position including a spring means for securing a pressure engagement of said contacts in the closed position of said movable contact, trip means for freeing said movable contact from the influence of said actuating means and from said spring means to permit movement of said movable contact to open position independently of the iniiuence of said actuating means and spring means.
  • a fixed contact and a cooperating movable contact movable to open and to closed position, means biasing said movable contact to open position, actuating means for moving said movable contact to open and to closed position including a spring means for securing a pressure engagement between said contacts in the closed position of said movable contact, a latch member normally and releasably eiecting operative connection of said actuating means and spring means to said movable contact, and trip means for moving said latch member to release said movable contact from its operative connection to said actuating means and said spring means.
  • a fixed contact and a cooperating movable contact movable to open and to closed position means biasing said movable contact to open position
  • actuating means for moving said movable contact to open and to closed position including a spring means for securing a pressure engagement between said contacts in the closed position of said movable contact, a latch member normally and releasably effecting operative connection of said actuating means and spring means to said movable contact, and electroresponsive trip means operable in response to predetermined conditions for moving said latch member to release said movable contact from its operative connection to said actuating means and said spring means.
  • a switch member movable to open and to closed position to open and to close said contacts, means biasing said switch member to open position to open said contacts, actuating means for eiecting movement of the switch member to open and to'closed position including a spring means for securing a pressure engagement of said contacts in the closed position of the switch member, and means normally effecting an operative connection of said actuating means and spring means to the switch member including a latch member movable from a normal connecting position to a released position to release said switch member from operative connection to said actuating means and pressure securing means to permit opening of the switch member by its biasing means free from any influence of said actuating means and pressure securing means.
  • a switch member movable to open and to closed position to open and to close said contacts, means biasing said switch member to open position, actuating means for eiecting movement of the switch member to open and to closed position including a toggle, and a spring means for connection to said switch member, said spring means providing a pressure engagement of said contacts when the breaker is closed, and a releasable latch member normally effecting an operative connection of said toggle and spring means to said switch member, said latch member being movable to release said switch member from operative connection to said spring means to permit opening of the switch member by its biasing means free of any iniiuence by said spring means and toggle.
  • a switch member movable to open and to closed position to open and to close said contacts, means biasing said switch member to open position, actuating means for effecting movement of the switch member to open and to closed position including a toggle and a spring means for connection to said switch member, said spring means providing a pressure engagement of said contacts when the breaker is closed, and a releasable latch member normally effecting an operative connection of said toggle and spring means to said switch member, said latch member being movable to release said switch member from operative connection tosaid toggle and spring means to permit opening of the switch member by its biasing means free of any inuence by said spring means and toggle, said latch member being bodily shiftable by said actuating means during normal operation of said breaker.
  • a circuit breaker relatively movable contacts, a switch member movable to open and to closed position to open and to close said contacts, means biasing said switch member to open position, actuating means for eiecting movement of the switch member to open and to closed position including a toggle and a spring means for connection to said switch member, said spring means providing a pressure engagement of said contacts when the breaker is closed, and a releasable latch member normally effecting an operative connection of said spring means to said switch member, said latch member being movable to disconnect said toggle and spring means from said switch member to permit opening of the switch member by its biasing means free oi any influence by said spring means and toggle, said latch member being bodily shiftable by said actuating means during normal operation of said 1 breaker, and current responsive means operable supporting said contacts and said actuating means and said trip means to form a unit, means for removably mounting said unit on said base, said base being provided with a recess forming an interrupting chamber for receiving said contacts and pole pieces
  • a base relatively movable contacts, actuating means manually operable to open and close said contacts, trip means operable to cause opening of said contacts including an electromagnet, said electromagnet being provided with pole pieces adjacent said contacts for aiding in extinguishing the arc formed during circuit interruption, a frame for supporting said contacts and said actuating'means and said trip means to form a unit, means for removably mounting ysaid unit on said base, said base being provided with a recess forming an interrupting chamber for receiving said contacts and pole pieces; and a closure means carried by said unit for covering said interrupting chamber when the unit is in mounted position.
  • a fixed contact and a cooperating movable contact movable to open and to closed position means biasing said movable contact to open position
  • actuating means for moving said movable contact to open and to closed position including a spring means for securing a pressure engagement between said contacts in the closed position of said movable contact, a latch member normally and releasably effecting an operative connection oi said actuating means and spring means to said movable contact, an electromagnetic and a thermally responsive trip means, each operable in response to predetermined conditions to move said latch member to release said movable contact from operative connection to said actuating means and said spring means.
  • a base of insulating terrupting chamber relatively movable contacts disposed in said chamber, actuating means for said contacts mounted on said base outside said chamber, means closing the open side of said chamber, a plurality of spaced and insulated arc-extinguishing plates disposed in said chamber, and means for moving the arc drawn between ysaid contacts during circuit interruption into said plates to extinguish the same, said base being provided with at least one auxiliary chamber disposed opposite said plates and joining the interrupting chamber throughv the spaces between the plates for providing a back pressure to cause the arc to penetrate deep into the spaces between the plates and remain there until extinguished.
  • a pair of spaced stationary contacts and a cooperating movable bridging contact means forming a relatively small closed pressure chamber about said contacts, a plurality of spaced arc-extinguishing plates disposed in said chamber adjacent each stationary contact means for moving the arcs drawn between said bridging contact and the stationary contacts in opposite directions into said plates for extinguishing the same, and means for actuating said bridging contact from outside saidl chamber.
  • a base of insulating material therefor provided with a recess forming an interrupting chamber a breaker unit including a pair of spaced stationary contacts, a movable bridging contact, actuating means for the bridging contact, electromagnetic means having a pair of pole pieces disposed on opposite sides of the contacts and path of movement of the bridging contact for moving the arcs drawn between said bridging contact and stationary contacts outwardly in opposite directions, means removably mounting said breaker unit on saidy base so that said contact means and pole pieces are disposed in said recess, means closing said interrupting chamber, and a plurality of spaced and insulated arc-extinguishing plates disposed in said chamber adjacent each stationary contact into which the arcs are moved by said electromagnetic means.
  • a fixed contact and a cooperating movable contact movable to open and to closed circuit position means biasing said movablecontact to open circuit position
  • actuating means normally connected to said movable contact for moving said movable contact to open and closed circuit position including resilient means for securing a pressure engagement be- 'tween said contacts in the closed position of said movable contact, trip means for disconnecting said actuating means and said resilient contact x pressure securing means from said movable conmaterial provided with a recess forming an inf' tact to permit said biasing means to quickly move said movable contact to open circuit position.
  • a xed stationary contact -a cooperating contact movable to open and to closed circuit position, means biasing said movable contact to open circuit position, actating means for effecting movement of said movable contact to open and to closed circuit position including a means for securing a pressure engagement of said contacts in the closed circuit position of said movable contact, and trip means operable to immediately render said actuating means and contact pressure securing means incapable of exerting any force on said movable contact opposing movement thereof to open position by its biasing means.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Keying Circuit Devices (AREA)
US164142A 1936-09-12 1937-09-16 Circuit breaker Expired - Lifetime US2144475A (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE1936S0124153 DE701870C (de) 1936-09-12 1936-09-12 Selbstschalter
DE1936S0124266 DE702993C (de) 1936-09-12 1936-09-22 UEberstromschalter
DES124304D DE706843C (de) 1936-09-12 1936-09-25 Kleinschnellschalter mit UEberstromausloeser fuer elektrische Hasn- und Gewerbeanlagen
DES124390D DE708012C (de) 1936-09-12 1936-10-02 Kleinschnellschalter mit UEbestromausloeser fuer elektrische Haus- und Gewerbeanlagen
DES128071D DE712051C (de) 1936-09-12 1937-07-17 Kleinschnellschalter
DES128072D DE714597C (de) 1936-09-12 1937-07-17 Kleinschnellschalter

Publications (1)

Publication Number Publication Date
US2144475A true US2144475A (en) 1939-01-17

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ID=27561217

Family Applications (2)

Application Number Title Priority Date Filing Date
US164142A Expired - Lifetime US2144475A (en) 1936-09-12 1937-09-16 Circuit breaker
US209194A Expired - Lifetime US2150307A (en) 1936-09-12 1938-05-21 Circuit interrupter

Family Applications After (1)

Application Number Title Priority Date Filing Date
US209194A Expired - Lifetime US2150307A (en) 1936-09-12 1938-05-21 Circuit interrupter

Country Status (5)

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US (2) US2144475A (fr)
DE (6) DE701870C (fr)
FR (1) FR826604A (fr)
GB (1) GB490721A (fr)
NL (3) NL49967C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270170A (en) * 1960-12-07 1966-08-30 Licentia Gmbh Compact switch having a simple breaking contact and associated arc extinction means

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE761784C (de) * 1937-04-10 1952-10-27 Aeg Wechsel- oder Drehstromschuetz mit Ausloesung durch UEberstrom
DE744294C (de) * 1941-05-07 1944-01-13 Landis & Gyr Ag Kontaktanordnung an Installationsselbstschaltern
DE942455C (de) * 1941-07-12 1956-05-03 Aeg Elektrischer UEberstromselbstschalter fuer Wechselstrom
DE951737C (de) * 1941-09-23 1956-10-31 Aeg UEberstromselbstschalter
US2697149A (en) * 1949-07-26 1954-12-14 Westinghouse Electric Corp Operating mechanism for line sectionalizers and the like
DE836822C (de) * 1949-08-26 1952-04-17 Otto Streng Dipl Ing Selbstschalter, insbesondere Kleinselbstschalter
DE941927C (de) * 1951-02-03 1956-04-19 Wilhelm Leyhausen Kleinselbstschalter in Sockelform
US2671835A (en) * 1951-06-29 1954-03-09 Leyhausen Wilhelm Automatic switch
DE937657C (de) * 1951-10-06 1956-01-12 Wilhelm Leyhausen Elektrischer Kleinselbstschalter in Sockelform
DE1020718B (de) * 1951-11-26 1957-12-12 Leopold Kostal Elektrotechnisc Installations-Selbstschalter
DE1027295B (de) * 1952-09-01 1958-04-03 Anni Margareta Leyhausen Geb E Elektrischer Kleinselbstschalter mit Kniehebel-Kontaktvorrichtung
DE968981C (de) * 1953-10-09 1958-04-17 Georg Rechel Schaltvorrichtung, insbesondere elektrischer Selbstschalter
DE1044234B (de) * 1953-11-03 1958-11-20 Licentia Gmbh Einbausockel-Selbstschalter in Schmalbauform mit magnetischer und thermischer Ausloesung
DE945267C (de) * 1953-12-08 1956-07-05 Licentia Gmbh Selbstschalter, insbesondere Leitungsschutzschalter
US2792470A (en) * 1954-07-07 1957-05-14 Harry Williams Mfg Company Circuit breaker mechanism
DE1003327B (de) * 1955-02-07 1957-02-28 Licentia Gmbh Installationsselbstschalter in Schmalbauform mit magnetischer und thermischer Ausloesung und einem oder mehreren abschaltbaren Hilfskontakten fuer allgemeine Leitungsschutz- oder Spezialzwecke
NL96953C (fr) * 1955-06-17
DE1106407B (de) * 1958-08-13 1961-05-10 Wickmann Werke Ag Selbstschalter
US2986618A (en) * 1959-04-07 1961-05-30 Ite Circuit Breaker Ltd Time delay tripping feature for high speed breakers
DE1133805B (de) * 1960-11-17 1962-07-26 Licentia Gmbh Mechanismus fuer Installations-Selbstschalter
DE1133806B (de) * 1961-01-23 1962-07-26 Siemens Ag Selbstschalter mit Kurzschlussausloesung
DE1192730B (de) * 1962-03-09 1965-05-13 Licentia Gmbh Schaltmechanismus fuer Selbstschalter
US3251232A (en) * 1964-06-25 1966-05-17 Airpax Electronics Toggle mechanism for circuit breakers
GB8804645D0 (en) * 1988-02-27 1988-03-30 Delta Electrical Holdings Circuit breaker
DE4330369A1 (de) * 1993-09-08 1995-03-09 Abb Patent Gmbh Leitungsschutzschalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270170A (en) * 1960-12-07 1966-08-30 Licentia Gmbh Compact switch having a simple breaking contact and associated arc extinction means

Also Published As

Publication number Publication date
GB490721A (en) 1938-08-19
NL54265C (fr) 1943-04-15
US2150307A (en) 1939-03-14
DE702993C (de) 1941-02-25
DE706843C (de) 1941-06-12
NL49967C (fr) 1941-03-15
FR826604A (fr) 1938-04-06
NL56886C (fr) 1944-09-15
DE712051C (de) 1941-10-10
DE714597C (de) 1941-12-03
DE701870C (de) 1942-02-20
DE708012C (de) 1941-07-10

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