The article basically is the relevant introduction about insurance resistor, emphasized pair of insurance resistor and common resistor to undertake be elaboratinged in detail.

 

Insurance resistor has the function of common resistor below normal circumstance, once circuit appears breakdown, when exceeding its rated power, it can be inside formulary time open circuit, reach protective other thereby yuan the action of parts of an apparatus. Insurance resistor cent is cannot repair and but repair two kinds.

 

 

 

The double effect of fuse and resistor is having in circuit graph, basically apply in the output circuit of output of power source circuit and 2 power source. They are worth with low block commonly (a few ohm come a few ohm) , small-power (1/8~1W) for many, its function is seasonable when flowing too fusing, the other component in protecting circuit spares attaint.

 

Short-circuit in circuit load breakdown, when appearing to flow, the temperature of insurance resistor can lift inside very short time 500~600 ℃ , at this moment resistor layer be heated flakes and fusing, have safe effect, achieve rise overall the purpose of security. [1]

 

 

Although protect danger resistor to apply in power source circuit,compare extensive, but each country home and manufacturer are in what circuit pursues medium to tag a method however each are not identical. Although tag a symbol to had be notted unite at present, but they have common characteristic however:

 

(1) they are noted with the mark of general resistance apparently different, this is judged very easily in circuit graph.

 

(2) the voltaic capacity that it uses at power source circuit commonly bigger or the low pressure that 2 times power source generates or high-pressured circuit are medium.

 

(3) there is a lubricious link only above insurance resistor. See attached drawing place is shown, the color of lubricious annulus states block is worth.

 

(4) danger resistance is being guaranteed in circuit is long foot solder it is on circuit board (general resistance is clingy circuit board solders) , with circuit board distance is further, already facilitated come loose to heat up and distinguish.

 

 

(1) RN1/4W, 10Ω insurance resistor, lubricious annulus is black, power is 1/4W; Add in insurance resistor when 8.5V volts d.c. when two end, resistor of 60 seconds less than increases the 50 times above that is initiative value.

 

(2) RN1/4W, 2.2Ω insurance resistor, lubricious annulus is red, power is 1/4W; When 3.5A electric current is passed, the internal resistance of 2 seconds increases the 50 times above that is initiative value.

 

(3) RN1/4W, 1Ω insurance resistor, lubricious annulus is white, power is 1/4W; When 2.8A alternating current is passed, 10 seconds internal resistance increases the 400 times above that is initiative value.

 

Have the function of resistor, it is resistor fuse is equal to resistor to add fuse only, when the power that increases exceeds the power of resistor, fuse can be burned, won’t whole resistor burns fume to rise. And resistor is the power that increases when place when exceeding itself power, can burn rise, fumy.

 

Insurance resistor calls fusing resistor again, it reachs the application in the high-grade electric equipment such as instrument, appearance in disc player of television, videocorder, CD, VCD quite extensive. The double application; that insurance resistor is removing resistor and frit silk in circuit falls in normal circumstance, it appears when circuit as resistor use; breakdown (the given load that protects circuit more than for example) when, the fusing material on insurance resistor body produces reaction with respect to meeting and resistor film layer (reaction change time is calculated with the second) , cause resistor film layer to rupture, make the block of insurance resistor is worth become very big or infinity, protect relevant circuit to concern yuan of parts of an apparatus mediumly to be not damaged. The circuit symbol of insurance resistor and enclose a form, at present the circuit symbol of insurance resistor returns the regulation with unified neither one.

 

 

1, the exterior examines with range estimation law below normal illumination condition.

 

2, the vernier calipers that the over all dimension of resistor is 0.02mm with precision falls in normal illumination condition undertake examining.

 

3, electric parameter uses instrument of ” of bridge of “YD2810D LCR number to undertake metrical below 1KHz frequency. High temperature examines, put the component that be measured into sweatbox of blast of constant temperature of 130 ℃ electric heat, undertake metrical after 5 minutes.

 

4, electric function pounds experimental table with “ (self-restrained, insurance resistor is special) ” is pounded 30 times continuously below normal temperature, fusing of redo short circuit checks.

 

5, clarity still answers after ohmmeter face impress is wiped 3 times with alcohol cotton but differentiate.

 

6, bring a foot to fight curved function: Clip resistor either to leave intermediate position of the foot with forceps, fold curved 90° , pull next straight, it is so, the requirement folds a turn 3 times to be on the same way of same plane, the requirement cannot have rupture phenomenal happening.

 

7, solderability presses Fan Jin of solderability test gauge to examine all right, should accord with the regulation of 5.2.1.

 

How should fuse attaint be good? Once discover fuse resistor is burned-out, answer to find out the former firm that burns fuse resistor first, do not allow to change blindly absolutely, cannot use common resistor generation to change more. If do not have the insurance resistor of identical norms, can undertake by the following method lash-up generation is changed.

 

1. rises with resistor and fuse series connection substitute to mix a resistor a fuse (or insurance canal) series connection rises substitute, the norms of the block value of resistor, power and insurance resistor. Be sure formerly for example the norms of resistor is 10Ω , 2W, criterion resistor can choose 10Ω/2W, the I of rated electric current of fuse by R=56%P of formulary I square among them R is resistance (Ω ) , p is rated power (W) . This can reach rated electric current should be 0.3A.

 

2. substitutes with fuse directly after a few block are worth lesser insurance resistor to damage, can substitute with fuse directly. This kind of method agrees with the insurance resistor under 1Ω , the value of fusing electric current of fuse can press afore-mentioned formula by cipher out of primary insurance resistor.

 

3. is small electric bead substitutes Xiao electric bead has certain block value, when electric current increases fixed cost, its filament can give off light or burn, according to this one characteristic, can replace insurance resistor effectively. Commonly used flashlight is small the cold conditions resistor of electric bead arrives for ten ohm a few ohm, rated electric current is hundreds of milliampere. Actual condition can be occupied when the overhaul and decide.