CN201465940U

CN201465940U - Multifunctional minitype circuit breaker

Info

Publication number: CN201465940U
Application number: CN2009201039817U
Authority: CN
Inventors: 李娅红
Original assignee: Hebei Baokai Electrical Equipment Co Ltd
Current assignee: Hebei Bao Kay Electric Co ltd
Priority date: 2009-08-03
Filing date: 2009-08-03
Publication date: 2010-05-12
Anticipated expiration: 2019-08-03

Abstract

The utility model relates to a multifunctional minitype circuit breaker which can be used for improving the performance of the circuit breaker and reducing the cost. The multifunctional minitype circuit breaker has the technical scheme of comprising a dipolar minitype circuit breaker with the functions of over-current protection and short circuit protection, and an over/under-voltage protection circuit, wherein the dipolar minitype circuit breaker comprises an L-pole circuit breaker and an N-pole circuit breaker which respectively correspond to a phase line and a zero line of single-phase AC current are connected into a whole by a handle and a tripping mechanism; and the over/under-voltage protection circuit is installed inside a shell of the N-pole circuit breaker, an input end of the circuit is connected with single-phase AC power supply voltage, and an output end thereof is used for controlling the tripping mechanism. The over/under-voltage protection circuit occupies no space outside the circuit breaker, has complete protecting functions as well as small width and volume, and can reduce the size of a distribution box and lower the cost under the condition of the same function. Meanwhile, as the over/under-voltage protection circuit is internally provided with simplified external wiring, the reliability of the circuit breaker is improved.

Description

The multifunctional small-size circuit breaker

Technical field

The utility model relates to the miniature circuit breaker that uses in a kind of Residential distribution box, belongs to the resist technology field.

Background technology

At present; the band that Residential distribution box (dividing box) is installed as the total input-wire switch, the under-voltage protection function miniature circuit breaker mainly contains two kinds: a kind of is assembly unit on the miniature circuit breaker of the two poles of the earth, under-voltage protecting circuit annex; though this circuit breaker defencive function is complete; but owing to mistake, under-voltage protecting circuit annex are installed in the circuit breaker outside; big (the width that cross, device for under-voltage releasing equipment takies two moduluses at least when being assembled in the outside of the width of whole circuit breaker and volume; its size is about 18 millimeters); thereby the size of distribution box is increased, cost is higher relatively.In addition, this circuit breaker external cabling complexity breaks down easily, and reliability is lower.Another kind is singly to add overvoltage or under-voltage protecting circuit on residual current circuit breaker, and this circuit breaker shortcoming is that defencive function is less, can not satisfy the requirement of civil buildings design specification.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of defencive function complete, the multifunctional small-size circuit breaker that volume is little and reliability is high.

Problem of the present utility model realizes with following technical proposals:

A kind of multifunctional small-size circuit breaker; it comprises the two poles of the earth miniature circuit breaker and mistake, under-voltage protecting circuit with overcurrent protection and short-circuit protection function; described the two poles of the earth miniature circuit breaker comprises L utmost point circuit breaker and N utmost point circuit breaker; the phase line and the zero line of the corresponding single-phase alternating current of difference; L utmost point circuit breaker and N utmost point circuit breaker connect as one by handle and tripping mechanism; described mistake, under-voltage protecting circuit are installed in the housing of N utmost point circuit breaker; its input order cross streams supply voltage, output control tripping mechanism.

Above-mentioned multifunctional small-size circuit breaker, described mistake, under-voltage protecting circuit are made up of voltage signal acquisition circuit, over-voltage detection circuit, undervoltage detection circuit and triggering executive circuit, described voltage signal acquisition circuit is made of rectifier bridge, and its ac input end connects supply voltage; Described undervoltage detection circuit is by triode, voltage-stabiliser tube, the anti-backflow diode, five resistance and three electric capacity constitute, described five resistance are called first resistance, second resistance, the 3rd resistance, the 4th resistance and the 5th resistance, described three electric capacity are called first electric capacity, second electric capacity and the 3rd electric capacity, wherein, first resistance and second resistance are connected into the dc output end that is connected on rectifier bridge behind the voltage divider, the voltage division signal of output connects the base stage of triode through the 3rd resistance, the series connection of the 4th resistance and voltage-stabiliser tube is connected into the dc output end that is connected on rectifier bridge behind the voltage stabilizing circuit, the output signal of voltage stabilizing circuit connects the emitter of triode, the under-voltage signal of the collector electrode output of triode is through the 5th resistance, first electric capacity contacts the input of sending out executive circuit with the filter that second electric capacity constitutes with the anti-backflow diode, the 3rd electric capacity is the filter capacitor of transistor base input signal; Described over-voltage detection circuit is made of the 6th resistance, the 7th resistance, the 4th electric capacity and bidirectional diode, the 6th resistance and the 7th resistance are connected into the dc output end that is connected on rectifier bridge behind the voltage divider, and the output signal of this voltage divider is sent out the input of executive circuit after by the 4th capacitor filtering again through the bidirectional diode contact; Described triggering executive circuit is made up of thyristor and tripping coil, described thyristor is connected on the dc output end of rectifier bridge, its grid is taken over the output of pressing testing circuit and undervoltage detection circuit, and described tripping coil is series in the input circuit of rectifier bridge, its inner iron core control tripping mechanism.

The utility model will be crossed, under-voltage protecting circuit is installed in the housing of N utmost point circuit breaker; because excessively, device for under-voltage releasing equipment need not take up space in addition again; so the utility model not only defencive function is complete; and width and volume are little; under the identical situation of function, can reduce the size of distribution box, reduce cost. simultaneously; because external cabling has been simplified in postpone in mistake, the under-voltage protecting circuit, reliability of the present utility model also is significantly improved.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the left view of Fig. 1;

Fig. 3 was, the electric theory diagram of under-voltage protecting circuit;

Fig. 4 is an electrical schematic diagram.

Each label is among the figure: 1, L utmost point circuit breaker; 2, N utmost point circuit breaker; 3, handle; TQ, tripping coil; ZL, rectifier bridge; Q, triode; D1, voltage-stabiliser tube; D2, anti-backflow diode; D3, bidirectional diode; SCR, thyristor; R1～R7, resistance; C1～C4, electric capacity.

Embodiment

Referring to Fig. 1, Fig. 2; characteristics of the present utility model are that mistake, under-voltage protecting circuit (cross, device for under-voltage releasing equipment) are integrated among the N utmost point Shell of circuit breaker; become the integrated high breaking miniature circuit breaker of band overvoltage/undervoltage protection, this device integral width is 4 moduluses (4X9=36mm).This device is made up of shell, operating mechanism, thermal overload release, magnetictrip contact system, arc quenching system, mistake, under-voltage protection wiring board and tripping coil etc.The unique design structure makes the product integrated level higher, not only has the short-circuit protection ability of 6kA, and integratedly on the basis that does not increase small product size cross, under-voltage protection function.Mounting guide rail is a TH35-7.5 type standard steel mounting rail.

Referring to Fig. 4, supply voltage is flowed through behind the tripping coil TQ, rectification becomes direct current through rectifier bridge ZL, undervoltage detection circuit is actual to be a comparison circuit, the supply voltage rectification is after the 4th resistance R 4 makes the voltage-stabiliser tube D1 conducting of 12V, the 4th resistance R 4 mainly plays metering functions herein, form the voltage of 12V at the emitter of triode Q, the 3rd capacitor C 3 mainly is anti-interference effect, after the supply voltage rectification through first resistance R 1 and second resistance R, 2 dividing potential drops, form certain voltage by the 3rd resistance R 3 in triode Q base stage, because triode Q is the PNP pipe, so when triode Q base voltage is higher than emitter voltage 12V, not conducting of triode Q, when supply voltage drops to low-voltage value scope, triode Q base voltage is lower than collector voltage 12V, triode Q conducting, and the electric current after the conducting is through the 5th resistance R 5 current limlitings, 1 filtering of first capacitor C makes thyristor SCR triggering and conducting through anti-backflow diode D2 again.

The right forms overvoltage comparison circuit by the 6th resistance R 6, the 7th resistance R 7, the 4th capacitor C 4 and bidirectional diode D3, the conducting voltage difference of bidirectional diode D3 is approximately 32V, supply voltage is through the 6th resistance R 6 and the 7th resistance R 7 dividing potential drops, when supply voltage rises to overvoltage operating value scope, bidirectional diode D3 conducting, thyristor SCR triggering and conducting.

After the thyristor SCR conducting, supply voltage forms the loop through tripping coil TQ, rectifier bridge ZL, thyristor SCR, and tripping coil TQ is met the electric current of action, and moving circuit breaker snap close is supported in moving iron core adhesive, makes circuit breaker trip, cuts off the electricity supply.

The utlity model has following characteristics: overload and short-circuit protection function, over voltage defencive function are arranged, also have isolation features, product shape safety and comfort attractive in appearance, lever operated, " branch " " close " with distinguishing mark, easy for installation, reliable in action; Meet the requirement of " JGJ-16-2008-civil buildings design specification " fully.

The utility model is applicable to below the rated current 63A; exchange 50HZ; in the circuit of rated operational voltage 230V/400V; the overvoltage protection setting valve is 275V ± 5V; the under-voltage protection setting valve is that 170 ± 5V. is used for facility and the electrical equipment of alternating-current system are transshipped the usefulness of short circuit and overvoltage, under-voltage protection. be widely used in the industries such as dwelling house, building, electric power, post and telecommunications, traffic, industrial and mining enterprises.

Claims

1. multifunctional small-size circuit breaker; it is characterized in that; it comprises a two poles of the earth miniature circuit breaker and a mistake with overcurrent protection and short-circuit protection function; under-voltage protecting circuit; described the two poles of the earth miniature circuit breaker comprises L utmost point circuit breaker (1) and N utmost point circuit breaker (2); the phase line and the zero line of the corresponding single-phase alternating current of difference; L utmost point circuit breaker (1) and N utmost point circuit breaker (2) connect as one by handle (3) and tripping mechanism; described mistake; under-voltage protecting circuit is installed in the housing of N utmost point circuit breaker (2); its input order cross streams supply voltage, output control tripping mechanism.

2. according to the described multifunctional small-size circuit breaker of claim 1, it is characterized in that, described mistake, under-voltage protecting circuit are made up of voltage signal acquisition circuit, over-voltage detection circuit, undervoltage detection circuit and triggering executive circuit, described voltage signal acquisition circuit is made of rectifier bridge (ZL), and its ac input end connects supply voltage; Described undervoltage detection circuit is by triode (Q), voltage-stabiliser tube (D1), anti-backflow diode (D2), five resistance and three electric capacity constitute, described five resistance are called first resistance, second resistance, the 3rd resistance, the 4th resistance and the 5th resistance, described three electric capacity are called first electric capacity, second electric capacity and the 3rd electric capacity, wherein, first resistance (R1) and second resistance (R2) are connected into the dc output end that is connected on rectifier bridge (ZL) behind the voltage divider, the voltage division signal of output connects the base stage of triode (Q) through the 3rd resistance (R3), the series connection of the 4th resistance (R4) and voltage-stabiliser tube (D1) is connected into the dc output end that is connected on rectifier bridge (ZL) behind the voltage stabilizing circuit, the output signal of voltage stabilizing circuit connects the emitter of triode (Q), the under-voltage signal of the collector electrode output of triode (Q) is through the 5th resistance (R5), first electric capacity (C1) contacts the input of sending out executive circuit with the filter that second electric capacity (C2) constitutes with anti-backflow diode (D2), the 3rd electric capacity (C3) is the filter capacitor of triode (Q) base input signal; Described over-voltage detection circuit is made of the 6th resistance (R6), the 7th resistance (R7), the 4th electric capacity (C4) and bidirectional diode (D3), the 6th resistance (R6) and the 7th resistance (R7) are connected into the dc output end that is connected on rectifier bridge (ZL) behind the voltage divider, and the output signal of this voltage divider is sent out the input of executive circuit after by the 4th electric capacity (C4) filtering again through bidirectional diode (D3) contact; Described triggering executive circuit is made up of thyristor (SCR) and tripping coil (TQ), described thyristor (SCR) is connected on the dc output end of rectifier bridge (ZL), its grid is taken over the output of pressing testing circuit and undervoltage detection circuit, described tripping coil (TQ) is series in the input circuit of rectifier bridge, its inner iron core control tripping mechanism.