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Air Circuit Breaker
Names of exterior part
ACB (Fixed Type, Draw out Type) Names of exterior part
  • ① Front cover
  • ② Arc extinguish chamber
  • ③ Control circuit terminal
  • ④ Electronic trip relay
  • ⑤ Counte
  • ⑥ Closing button
  • ⑦ Charging handle
  • ⑧ Name plate
  • ⑨ Caution mark
  • ⑩ position indicator
  • ⑪ Pushing/Drawing lever hole
  • ⑫ Charging indicator
  • ⑬ Extension rail
  • ⑭ Trip button
  • ⑮ ON/OFF indicator
  • (16) Draw-out profile
  • (17) Main body profile
  • (18) Handle
Internal Structure
ACB (Fixed Type, Draw out Type) Internal Structure
  • ① Front cover
  • ② Electronic trip relay
  • ③ Auxiliary switch
  • ④ Arc extinguish chamber
  • ⑤ Closing coil
  • ⑥ ON/OFF indicator
  • ⑦ Closing mechanism
  • ⑧ Trip mechanism
  • ⑨ Trip coil
  • ⑩ Charging handle
  • ⑪ Charging indicator
  • ⑫ Draw-out mechanism
  • ⑬ Position indicator
  • ⑭ Gear block
  • ⑮ Draw-out cam
  • (16) Extension rail
  • (17) Closing spring
  • (18) Movable shunt
  • (19) Safety shutter
  • (20) Circuit breaker connection conductor
  • (21) Load side conductor
  • (22) Draw-out conductor
  • (23) Breaking spring
  • (24) Power supply side conductor
  • (25) Fixed contact
  • (26) Traveling contact
  • (27) Draw-out main body
Specifications
  • ISO 9001, ISO14001, applied for patent
Compact and light weight
The product is designed to be efficient and suitable for stand-alone switchboards by reducing its size and weight up to 85% to that of existing products.
Less size variation
Size variations have been reduced from four types to three types.
630~1250A / 1600~2000A / 2500A / 3200~4000A → 630~1600A / 2000~2500A / 3200~4000A
Safe and convenient
The control circuit terminal block is attached on the upper side of the product.
The mechanism and attached devices have been modularized in order to provide easy maintenance and inspection.
The draw-out rail has been significantly improved to allow easy draw-out.
The arc space has been minimized. The modular type cover offers a better appearance.
High-function digital protective relay
It is easier to identify the trip status with the trip status LED on the digital protective relay.
- The OCR tester (sold separately) offers a high-accuracy current detection circuit.
Various attachments
Improved quality through the application of diverse attachments.
Close first, open later type
When closing and opening main contact, the contact on the N phase contacts before and falls later than R, S, T phases, and thus prevents accidents that may occur from the previous position (especially when using single-phase load).
Example of configuring ACB type
Example of configuring ACB type : Installation method/Poles/Rated current(A)/Operating current(V)

S : type breaking capacity / H : High type breakung capacity

Rated operating voltage(V) 660 660 660 660 660 660 660 660 660
Frame current(AF) 630 800 1000 1250 1600 2000 2500 3200 4000
Setting Base Current (A) 630 630 800 1000 1250 1600 2000 2500 3200 4000
630 504 640 800 1000 1280 1600 2000 2560 3200
504 378 480 600 750 960 1200 1500 1920 2400
Breaking capacity S H S H S H S H S H S H S H S H S H
Rated service short circuit (lcs)(kA)
/
Rated short circuit making capacity (Icm)(kA)
IEC
947-2
220 / 240V 60 75 60 75 65 75 60 75 60 75 60 75 60 75 60 75 85 100
380 / 415V 55 70 55 70 55 70 55 70 55 70 55 70 55 70 55 70 75 90
440 / 500V 50 65 50 65 50 65 50 65 50 65 50 65 50 65 50 65 65 85
600 / 660V 42 55 42 55 42 55 42 55 42 55 42 55 42 55 42 55 55 75
VDE
0660
480V 50 65 50 65 50 65 50 65 50 65 50 65 50 65 50 65 65 85
600V 42 50 42 50 42 50 42 50 42 50 42 50 42 50 42 50 50 65
BS
4752
Below 500V 105 143 105 143 105 143 105 143 105 143 105 143 105 143 105 143 143 187
690V 88.2 105 88.2 105 88.2 105 88.2 105 88.2 105 88.2 105 88.2 105 88.2 105 105 143
short time withstand
capacity(kA)
AC 500V 이하
peak
(kA, peak)
105 143 105 143 105 143 105 143 105 143 105 143 105 143 105` 143 143 187
Break
type
1 Sec 50 65 50 65 50 65 50 65 50 65 50 65 50 65 65 85 85 100
3 Sec 30 30 30 30 50 50 50 65 85
Operation time Total breaking time Below 45ms Below 50ms
Rated closing time Below 65ms Below 80ms
Number of poles 3P/4P 3P/4P 3P/4P 3P/4P 3P/4P 3P/4P 3P/4P 3P/4P 3P/4P
endurance Mechanical Without maintenance 10000 10000 10000 10000 10000 10000 10000 10000 10000
With maintenance 20000 20000 20000 20000 20000 20000 20000 20000 20000
electrical Without maintenance 2500 2500 2500 2500 2000 1000 1000 1000 600
With maintenance 5000 5000 5000 5000 5000 3500 3500 3500 1500
Motor operation Without maintenance 5000 5000 5000 5000 5000 3500 3500 3500 1500
weight(kg) Fixed 52 64 52 64 55 68 55 68 58 70 64 72 71 78 83 94 93 103
Draw-out 80 87 80 87 84 90 84 90 85 96 97 104 106 113 115 128 132 148
Standard
Draw-out type, Closing coil, Trip coil, Counter, OCR, Aux-switch(2a2b)
Operating voltage, OCR trip signal
Option
OCGR, CTD, Shutter device, OCR Tester, OCR alarm switch, Key switch,
Locationswitch, Auxiliary switch (AUX switch 3a3b,4a4b)
Product Attributes
  • Diversification is given to set circuit breaking conditions including electric current in a long time delay, in a short time delay, in an instantaneous trip and in ground fault. This provides a wide variety of choices and satisfaction of detailed needs.
  • The energy for closing in store at springs, which brings about raped and precise operation.
  • Equipment can be used for either AC and DC according to the situation, which has diversified the choice as an option.
  • All parts are standardized with molds to be repaired and maintained easily. And thorough inspection and standardized production bring about long durability.
  • Reliability is much enhanced by the ability to confirm breaking by different causes.
Installation method
Fixed Type
The unit is directly connected to the panel board and is an economical method installation.
Draw out Type
It consists of two parts the main body of the breaker and the panel board frame.
It is directly connected to the panel board and the main body of the breaker is mounted on the draw out frame.
The main body of the breaker can be separated from the panel board without change in circuit.
Benefits easy checking for its function, easy repairing & charging part and maintenance, easy replacement of breaker itself.
ACB Fixed Type, Draw out Type
Operation Method
Manual Storage Method
•It stores spring the energy needed for closing by moving the storage handle from up to down about 7 times.
•Repetition of the storage handle movement continues until the charging indicator displays "CHARGED".
※ Caution : Manual charging should be performed while the breaker is in opening state.
Automatic Storage Method
•It stores the energy needed for closing by using an electric storage motor , which is activated the closing circuit.
•When the breaker starts breaking, the motor is automatically activated to store the energy needed for closing.
•The storage motor is capable of storing energy 50 times. However, to do more than 50 times, it requires cooling for 10 minutes, as a minimum, preventing the motor from overheat.
Closing coil
•It is a Solenoid-State coil, which is operated by a closing signal coming from outside or by a pressing button attached to the front side.
Opening coil
•It is a Solenoid-State coil, which trips after receiving signals from OCR or from outside.