CN2256585Y

CN2256585Y - Single phase leakage circuit breaker

Info

Publication number: CN2256585Y
Application number: CN 95246348
Authority: CN
Inventors: 卢湛锐
Original assignee: FESHAN CITY SEMICONDUCTOR APPLIANCES FACTORY
Current assignee: FESHAN CITY SEMICONDUCTOR APPLIANCES FACTORY
Priority date: 1995-12-21
Filing date: 1995-12-21
Publication date: 1997-06-18
Anticipated expiration: 2005-12-21

Abstract

The utility model relates to a single phase leakage circuit breaker, which comprises a contact bridge, a switch, a leakage trip coil, a circuit board, a zero-sequence current mutual inductor. A bimetallic strip is arranged between the contact bridge and a lock catch; outside surface of the leakage trip coil is wound with a short circuit detecting coil to form into a double-coil loose core type tripping system structure. One end of an iron core is clamped with the lock catch to realize the overload, short circuit and leakage protection of lines. The utility model has the advantages of small volume, compact structure, high reliability, and is suitable for various installation requirements. When the leakage tripping voltage drops to AC 50V, the single phase leakage circuit breaker can still normally motion to satisfy new requirements of global standard.

Description

Single-phase residual current circuit breaker

The utility model relates to the electric security protector technical field, the single-phase residual current circuit breaker of the usefulness of particularly a kind of overload as circuit, short circuit, earth leakage protective.

Existing split mounting type residual current circuit breaker, assembled by the miniature circuit breaker of several one poles.It partly is contained in leakage switch in the housing identical with one pole miniature circuit breaker shell, is assembled in one with two miniature circuit breakers that have overload, short-circuit protection function respectively.After action was differentiated in electric leakage, the snap close that is driven miniature circuit breaker by connecting rod was threaded off, and made the circuit breaker action.All to put in the housing because of its current transformer, release, wiring board, force current transformer to want miniaturization, need amplify leakage current with integrated circuit, thereby, causing poor stability, the leakage tripping device operating voltage is higher.A kind of multifunction switch is arranged, and is to increase defencive functions such as overcurrent, short circuit on the basis of leakage switch.When determining electric leakage, overcurrent or short circuit, all be by being fixed on the coil electricity on the iron core external diameter, making iron core adhesive face produce magnetic attraction, inhale and open armature, draw back snap close, making the switch disjunction.Because gapped between iron core and the armature, so release needs higher drop away voltage, and the contact system breaking capacity is low.

The purpose of this utility model is to provide a kind of reliability height, volume is little, cost is low, incorporate single-phase residual current circuit breaker, and it not only has creepage protection function, also has overload and short-circuit protection function.

The utility model is achieved in that a kind of single-phase residual current circuit breaker, comprise screw 1, stationary contact bridge 2, movable contact bridge 3, switch 4, snap close 6, electric leakage tripping coil 8, electric leakage monitoring circuit plate 10, zero sequence current mutual inductor 11, base 12 and bimetal leaf 5, iron core 7, short-circuit detecting coil 9, between movable contact bridge 3 and snap close 6, bimetal leaf 5 is housed; Be wound with short-circuit detecting coil 9 at electric leakage tripping coil 8 outer surfaces, the one end is connected with bimetal leaf 5, and the other end is serially connected with on the load major loop; In the central shaft hole of electric leakage tripping coil 8 skeletons iron core 7 is housed, its outer end is connected on the snap close 6.

The utility model has been owing to adopted the Drawing-Core tripping system structure of twin coil, above-mentioned all in addition parts be installed in the shell with one pole miniature circuit breaker same size, thereby have the advantage that volume is little, cost is low, reliability is high; Be fit to multiple mounting meanss such as guide rail installation, setting-in and screw; The electric leakage drop away voltage is reduced to 50V50Hz still can regular event; Satisfied new request of national standard.

Fig. 1 is the utility model structural representation.

By following embodiment the utility model is further elaborated.

Referring to shown in Figure 1, on base 12, the stationary contact bridge of fixing with screw 12 is installed, movable contact bridge 3 middle parts and switch 4 one ends join, and movable contact bridge 3 other ends and bimetal leaf 5 one ends join, and bimetal leaf 5 other ends are parallel relative with snap close 6.Be wound with electric leakage tripping coil 8 and short-circuit detecting coil 9 on same skeleton, short-circuit detecting coil 9 one ends are connected with bimetal leaf 5 by lead, and its other end is serially connected with on the load major loop.Iron core 7 is housed in the central shaft hole of skeleton, and its outer end is connected on the snap close 6.Zero sequence current mutual inductor 11 and electric leakage monitoring circuit plate 10 also are equipped with in base 12 rear portions.Load onto cover at last and become a complete single-phase residual current circuit breaker.

When overload current appearred in loaded line, excessive electric current flow through bimetal leaf 5 by quiet, movable contact bridge 2,3, made its heating produce distortion, promoted snap close 6 and threaded off, and switch 4 drives movable contact bridge 3 and leaves stationary contact bridge 2, cuts off the electricity supply, and realizes overload protective function.

The moment that occurs short circuit current when loaded line; powerful electric current flows into short-circuit detecting coil 9 by quiet, movable contact bridge 2,3, bimetal leaf 5; when thermal deformation does not also take place in bimetal leaf 5; short-circuit detecting coil 9 produces powerful magnetic field immediately; make iron core drive snap close 6 and move rapidly, draw back snap close 6, and make switch 4 disjunctions to the stage casing of the strongest short-circuit detecting coil 9 in magnetic field; cut off the electricity supply, realize the short-circuit protection effect.

When leakage current appears in loaded line; when zero sequence current mutual inductor 11 detects above set point; the controllable silicon conducting of electric leakage monitoring circuit plate 10; electric leakage tripping coil 8; produce powerful magnetic field in this coil stage casing, make iron core 7 motions and drive snap close 6 and move rapidly backward, make switch 4 disjunctions; thereby cut off the electricity supply, play the earth leakage protective effect.Because the magnetic force of electric leakage tripping coil 8 acts directly on the iron core 7, has reduced the magnetic force loss, thereby, exchanging under the 50V voltage, electric leakage tripping coil 8 also can draw back snap close 6 by iron core 7, cuts off the electricity supply.

Claims

A kind of single-phase residual current circuit breaker, comprise screw 1, stationary contact bridge 2, movable contact bridge 3, switch 4, snap close 6, electric leakage tripping coil 8, electric leakage monitoring circuit plate 10, zero sequence current mutual inductor 11, base 12, it is characterized in that bimetal leaf 5, iron core 7, short-circuit detecting coil 9 in addition, bimetal leaf 5 is housed between movable contact bridge 3 and snap close; Be wound with short-circuit detecting coil 9 at electric leakage tripping coil 8 outer surfaces, the one end is connected with bimetal leaf 5, and the other end is serially connected with on the load major loop; In the central shaft hole of electric leakage tripping coil 8 skeletons iron core 7 is housed, its outer end is connected on the snap close 6.