Thanks for visiting Electrical Engineering Equipment Company. Please remember to bookmark this page Circuit Breaker 20. If you found what your looking for, then don"t forget to click an appreciation button above for this post.
 FPE Federal Pacific NAGF20 20 Amp GFI Circuit Breaker US $180.00 
|
 FUJI CIRCUIT BREAKER 20 AMP BU-ESB3020 US $39.99
|
 Cutler Hammer HFD2020 circuit breaker 2pole 20amp new US $325.00
|
 SQUARE D CIRCUIT BREAKER I-LINE 20 AMP FA26020AB 2 POLE US $50.00
|
 10pcs DZ47-60 C20 2P 20A Circuit Breaker US $79.99
|
 3P 3 Pole 1-1.6A Moulded Case Circuit Breaker DZ108-20 3VE1 US $21.46
|
 AC 230V 400V 20A 1P Transparent Miniature Mini Circuit Breaker US $6.43
|
 Siemens ITE B22000S01 shunt circuit breaker 2pole 20amp US $68.00
|
 3P 3 Pole 6.3-10A Moulded Case Circuit Breaker DZ108-20 3VE1 US $22.05
|
 Circuit Breaker General Electric 1pole 20A 30A 40A 50A US $4.00
|
 ITE EH3-B020 CIRCUIT BREAKER 20AMP 3POLE 480VAC US $119.99
|
 DZ108-20 3VE1 3.2-5A MPCB Motor Protection Circuit Breaker US $22.33
|
 Transparent AC 230V 400V 20A 1P+N Earth Leakage Circuit Breaker US $12.68
|
 Cutler-Hammer 2P 20 Amp Type BR Circuit Breaker BR220 US $5.00
|
 HJA36020 Square D Molded Case Circuit Breaker (H-Frame) 20A, 3-Pole, 600 Vac, A US $370.00
|
 westinghouse BR BR220 pole 20 amp Circuit Breaker US $4.99
|
 Siemens QP Q120 CIRCUIT BREAKER 20AMP 1POLE 120VAC US $5.24
|
 GE General Electric 20 Amp 1 POLE CIRCUIT BREAKER 120/240V TQP Mini THQP US $6.99
|
 General Electric 20Amp Circuit Breaker 1 Pole 240VAC US $7.49
|
 General Electric UO633 Circuit Breaker 20 Amp 1 Pole US $14.99
|
 ITE/Siemens Q320, 20 Amp Circuit Breaker US $50.00
|
 General Electric 20Amp Circuit Breaker (lot of 2) US $14.99
|
 Square D 20 amp circuit breaker FDA140203 I-Line US $102.75
|
 Siemens ITE ED42B020 circuit breaker 2pole 20amp US $115.00
|
 ITE Siemens BQ2 BQ2B020 2 Pole 20 amp Circuit Breaker US $6.50
|
 Square D 20Amp Circuit Breaker 240VAC 1 Pole US $11.24
|
 AC 400V 20A 2P Transparent Mini Circuit Breaker MCB with Housing US $13.86
|
 EHB14020, 277V, 20A, 1 Pole Circuit Breaker US $41.40
|
 Thermo Magnetic Circuit Breaker 20A 480 Volt / 240V - MADE IN USA US $125.00
|
 Cutler-Hammer BR220 CIRCUIT BREAKER 20AMP 2POLE 120/240 US $10.49
|
 Stopcircuit Circuit Breaker, GMT 20D P1, Warranty US $27.50
|
 CUTLER HAMMER BR120AF 20 AMP ARC FAULT CIRCUIT BREAKER NEW IN THE BOX US $24.95
|
 SIEMENS BQD320 20 AMP 3 POLE 480 VOLT CIRCUIT BREAKER GREAT SHAPE! US $74.95
|
 Westinghouse 3P 20 Amp Circuit Breaker Quicklag Type P US $24.99
|
 1 NIB FPE 3P20 20 AMP 3 POLE 240 VAC STAB-LOK CIRCUIT BREAKER US $64.50
|
 Square D 20amp Thermal Magnetic Circuit Breaker I-LINE US $67.00
|
 GE CIRCUIT BREAKER MAG-BREAK TBC43400F20 400 AMP G-93 US $229.99
|
 Cutler Hammer FD3020 20A Circuit Breaker-New $349.98 US $349.98
|
 Circuit Breaker ITE 3pole 15A 20A 30A 50A 70A EE3BOxx US $100.00
|
 Westinghouse Circuit Breaker 1222033, 20 Amp #28418 US $99.99
|
 Square D QO8 20Amp Circuit Breaker 240VAC 2Pole US $18.74
|
 Heinemann 0911 Circuit Breaker 20Amp 1 Pole US $52.99
|
 WESTINGHOUSE QNBL2020 CIRCUIT BREAKER 2 POLE 20 AMP US $10.99
|
 Stopcircuit Circuit Breaker, GMT 20U P1, Warranty US $27.50
|
 ITE QP3-B020 CIRCUIT BREAKER 20AMP 3POLE US $24.74
|
 CUTLER HAMMER EHD3020L 20AMP 3POLE CIRCUIT BREAKER US $90.00
|
 ITE QP1-B020 CIRCUIT BREAKER 20AMP 1POLE 120/240V US $9.74
|
 Cutler-Hammer 1P 20 Amp Type CHB Circuit Breaker CHB120 US $4.00
|
 AC 400V 20A Three Poles 3P MCB Miniature Circuit Breaker US $13.77
|
 Siemens ITE ED41B020 circuit breaker 1pole 20amp 277v US $15.00
|
 ITE Q120 CIRCUIT BREAKER 20AMP 1POLE 120VAC TYPE US $5.99
|
 Siemens ITE E41B020 circuit breaker 1pole 20amp 277v US $20.00
|
 EDB14020, 277V, 20A, 1 Pole Circuit Breaker US $30.00
|
 EGB14020, 277V, 20A, 1 Pole Circuit Breaker US $50.00
|
 (19-B) QO Load Center 20Amp Circuit Breaker Enclosed Q02-4L70S US $20.00
|
 3 USED SQUARE D CIRCUIT BREAKER FY14020A 20 AMP US $49.00
|
 WESTINGHOUSE FB CIRCUIT BREAKER 20A 600V 3P SHUNT TRIP US $100.00
|
 GENERAL ELECTRIC 20 AMP MOLDED CASE CIRCUIT BREAKER US $28.33
|
 square d 20 amp 1 pole circuit breaker 992120 ML-120 US $12.99
|
 Square D Circuit Breaker QO120 1P 20A 120/240V (NEW) US $10.00
|
 35mm DIN Rail Mount 2P Residual Current Circuit Breaker AC 400V 20A US $19.12
|
 ALLEN BRADLEY 1492-CB1 CIRCUIT BREAKER 20A 1P NIB!! US $25.00
|
 FD3020 Cutler Hammer 600v 3p 20a Series C Circuit Breaker NEW US $197.50
|
 NEW IN BOX CUTLER HAMMER HFD3020L INDUSTRIAL CIRCUIT BREAKER 3 POLE 20 AMP SER C US $180.00
|
 New Mitsubishi CP50-HU 2P 20A Circuit Breaker US $25.00
|
 Cutler-Hammer FS340020A Circuit Breaker, 480VAC, 20 Amp US $45.00
|
 SPCL2C20,Cutler Hammer Miniature Circuit Breaker lot 6@ US $92.90
|
 SQ-D THREE POLE 20 AMP CIRCUIT BREAKER US $49.00
|
 SQUARE D 20 AMP 3 POLE CIRCUIT BREAKER FA34020 ZAA-83 US $42.50
|
 GE TEY320 20A 3P 480V CIRCUIT BREAKER GENERAL ELECTRIC US $44.95
|
 2 FPE FEDERAL PACIFIC NE NE111020 20-AMP 1-POLE 120V CIRCUIT BREAKER LOT USED US $14.99
|
 GENERAL ELECTRIC TEY 20A 1 pole 277V circuit breaker US $4.28
|
 AC 400V 20A 2 Poles 2P Transparent MCB Mini Circuit Breaker US $10.95
|
 AC 230V 400V 20A 1P Transparent Miniature Circuit Breaker with Mounting Bracket US $6.97
|
 ABB Sace Isomax S Circuit Breaker S3HQ020TW 20A 3P NIB US $150.00
|
 NIB SQUARE D FAL26020 CIRCUIT BREAKER 20 AMP SERIES * US $140.00
|
 SQUARE D 20 AMP 1 POLE CIRCUIT BREAKER TYPE FH 20 A FH16020B B-17 US $26.50
|
 GENERAL ELECTRIC 20 AMP 2 POLE CIRCUIT BREAKER TYPE TQL-AC TQL2120 S-51 US $4.50
|
 NEW IN BOX Square D QO120CAFI Arc-D-Tect 20A 120V 1P Circuit Breaker/Arc-Fault US $24.99
|
 Circuit Breaker Square D 1pole 10A 15A 20A 30A 40A 50A US $4.00
|
 GE Circuit Breaker Type TEY 20Amp 2 Pole 480/277VAC US $89.00
|
 NEW SQUARE D 20 AMP 1 POLE CIRCUIT BREAKER TYPE QO QO120C G-47 US $8.50
|
 Cutler-Hammer E-7819 Type BA 20A 1 pole Circuit Breaker US $5.95
|
 Circuit Breaker QP 20A Q220 2 pole US $5.95
|
 Cutler Hammer 20 Amp BR120 CIRCUIT BREAKER 120/240V 1 pole C120 US $2.99
|
 NEW IN BOX SQUARE D FAL32020 CIRCUIT BREAKER 3 POLE 20 AMP US $38.00
|
 GE MG9059 CIRCUIT BREAKER 1 POLE, 20A, TEY, 277V, 14kA US $26.00
|
 SIEMENS BQD220 480Y/277 volt CIRCUIT BREAKER 20A H-31 US $34.88
|
Circuit Breaker 20
Description of Protective Switches Operation
Two articles in two last year's numbers of the magazine Er have presented a survey of operation of overcurrent protective devices, based on the use of traditional safety fuses. A similar survey can be presented also for the protective devices, manufactured as various protective switches.
These devices are in the first place:
* circuit breakers complying with the standard SIST EN 60898 – circuit breakers for overcurrent protection for household and similar installations;
* residual current circuit breakers without overcurrent protection built-in, complying with the standard SIST EN 61008;
* residual current circuit breakers without overcurrent protection built-in, for the use in household and similar applications (RCCB);
* residual current circuit breakers with overcurrent protection, complying with the standard SIST EN 61009 - residual current circuit breakers for the use in household and similar applications (RCCO).
Basic representation of a protective switch state is the position of the on-off button on the protective switch that can be down below, in the middle or above. As a rule, the operation of protective switches doesn't depend on their location, and can usually be mounted in any position, therefore the manufacturer must very clearly indicate which position of the on-off button or switch handle corresponds to the position "switched-on" or "switched-off". This is also one of requirements of all standards for such products. The manufacturers usually fulfil the requirement by printing this information on the product.
For better overview and better reliability the manufacturers usually place the indication 0/I or ON/OFF directly on ON-OFF buttons.
But the possibility of an error still remains on the protective device itself. The position of the ON-OFF button can be changed, but not the state of contacts inside the device (because the contacts are e.g. welded). Therefore more and more protective devices represent actual situation of contacts within the protective device: red flag – contacts of the switch are still closed; green flag – the contacts are open.
Such contact condition indication must ensure that the "green condition" isn't shown if the contacts are still closed, regardless of the position of switching mechanism and ON-OFF button.
It is often important to find out switched-off condition of the protective switch in the shortest possible time, because an urgent process may have been interrupted by switching off. And the protective switch might be installed in a relatively remote and badly visible place. In such cases the so-called auxiliary and signal switches are used. The difference between them is as follows: An auxiliary switch always changes the state of its contacts when the protective switch is switched; a signal switch (also named alarm switch), however, only changes the state of its contacts when the protective device is switched off due to a failure (manual switching-off doesn't change the contacts' condition).
So the task of these switches is to send information – remote signalling – to a remote location, about the changed condition of protective device. Consequently, they report a power supply interruption. This remote signalling is carried out through the contacts of an auxiliary switch that can switch on or off an acoustic or other type of signalization.
As for the mounting method of auxiliary switches, the following two situations can be distinguished:
* built-in auxiliary switches (they are incorporated into protective devices by the manufacturer);
* built-on auxiliary switches (a mechanical building-on in the field is possible).
For practical reasons the second variant is, of course, more appreciated.
With regard to the principle of operation the switches can be mechanical or electronic. For protective switches primarily mechanical versions are used. There is also a standard with which such products must comply, that is SIST EN 62019 – Electrical Committee – Circuit breakers and similar devices to be used in household area – Auxiliary contacts' unit.
In practice there can be found primarily auxiliary switches that by their external shape correspond to a basic protective switch, while their width equals one half of the standard module (9 mm). It is important to read the operating instruction, enclosed to the auxiliary switches before their installation. Namely, some of them have to be mounted when the main device is switched on, whereas for the others it must be switched off. The least, what can be caused by an incorrect installation is the malfunction of the auxiliary switch. Moreover, it can cause its damage, or even a damage of the main protective switch. A mechanical building-on can be usually carried out by means of clamps that can be metallic or plastic. With the older types adhesive tapes were still used, but they used to slacken due to aging or dirt, thus causing malfunctions.
An example of building-on an auxiliary switch to the circuit breaker is shown in Figure 4. The auxiliary switch is built on to the left-hand side, and the circuit breaker must be switched-off during the installation.
An example of technical specification for an auxiliary switch:
* rated voltage: 230 V a.c. or 110 V d.c.
* rated current: 6 A a.c. or 1 A d.c.
* conditional short-circuit capacity: 1 kA (with a preceding safety fuse cartridge of 20 A);
* contacts: 1 x a (closing), 1 x b (opening); the most often used combination;
* connecting terminals: 1 – 4 mm2.
Some important data are also printed on the side surface of the product (permissible screw torque for connecting terminals, marking of connecting terminals and a like.
For timely reporting switch-off conditions of protective switches, the auxiliary switches have been already now very often used in industry and electrical distribution. Improvement in the quality of electrical installation, and the use of so-called intelligent installations will certainly increase their use in house installations as well.
more
About the Author
If you are looking for a different item here are a list of related products on Electrical Engineering Equipment Company, please check out the following:
