Air Circuit Breaker

ACB (Fixed Type. Draw out Type) ACB (Detachable type)

■ Names of exterior part

Kyungdong Electric Air Circuit Breaker KD05 Series

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

Kyungdong Electric Air Circuit Breaker KD05 Series 1

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

Kyungdong Electric Air Circuit Breaker KD05 Series 2

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
		VDE 0660	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
		BS 4752	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
		Break type	3 Sec		30		30		30		30		50		50		50		65		85
Operation time		Total breaking time			Below 45ms										Below 50ms
Operation time		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
	Mechanical	With maintenance			20000		20000		20000		20000		20000		20000		20000		20000		20000
	electrical	Without maintenance			2500		2500		2500		2500		2000		1000		1000		1000		600
	electrical	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
weight(kg)		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

ㆍDiversification 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.

ㆍThe energy for closing in store at springs, which brings about raped and precise operation.

ㆍEquipment can be used for either AC and DC according to the situation, which has diversified the choice as an option.

ㆍAll parts are standardized with molds to be repaired and maintained easily. And thorough inspection and standardized production bring about long durability.

ㆍReliability 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.

Kyungdong Electric Air Circuit Breaker KD05 Series 3

■ 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.

Kyungdong Electric Air Circuit Breaker KD05 Series 4

A TMS CHIP (Micro computer) adopted on the ACB Controller automatically displays three-phase voltage, current, frequency, power factor, and active and reactive power.

There is no need to open the panel door to control the ACB.

■ Economical Efficiency

ㆍThere is no need to install a separate CT as it is built inside the ACB.

ㆍNo wiring work is required as the standard operating line supplied between the ACB main body and controller connects both ends to the connector.

ㆍA voltmeter, ammeter, power meter, power factor meter, operating switch, and O.C.R relay are installed inside the ACB Controller, making it unnecessary to install additional instruments or wiring.

ㆍThe ACB Panel offers excellent cost-effectiveness for it is easy to build by simply installing the ACB, mounting the controller, and connecting the supplied cable to the connector.

■ Product Attributes

ㆍThe fuse attached on the 3-phase voltage cable of the voltmeter makes the product safe to use.

ㆍThe voltmeter automatically measures the 3-phase voltage cable supplied from the main body of the ACB from 220V~660V.

ㆍThe readout for each phase is displayed immediately by pressing a button.

ㆍACB Controller has a built-in O.C.R relay which allows the user to change and control the current settings in a safe and convenient manner.

ㆍThe indicator makes it easy to identify the cause of an ACB blockage cause by O.C.R.

ㆍProduct is equipped with a test terminal that can be used for testing the properties of O.C.R relay.

ㆍThere is an alert function that activates when the current being used exceeds 90% of the O.C.R setpoint.

ㆍThere is a built-in lock device which only the administrator can use to restrict operation of the product.

ㆍSpecifications, ACB main body dimensions, bus bar dimensions, and mounting hole dimensions are identical to those of the Standard ACB.

ㆍThe C•T ratio can be installed according to the customer’s request. C•T provided by our company are as below.
C•T capacity: 200/5A, 300/5A, 400/5A, 500/5A, 630/5A, 800/5A, 1000/5A, 1250/5A, 1600/5A, 2000/5A, 2500/5A, 3200/5A, 4000/5A, 5000/5A

ㆍ* To order a C•T capacity other than those stated, please state the details on the order form (Only applies to detachable type).

■ ACB Controller

Kyungdong Electric Air Circuit Breaker KD05 Series 5