First, the scope

YDZ20Y Series Molded Case Circuit Breaker to do with shunt trip ( YDZ20Y MCCB ), applicable to the exchange 50Hz, rated insulation voltage 660V, rated working voltage 380V (400V) and the following circuit, the rated current from 16A to 1250A. Generally used as a distribution, in which Y, J, Q-type and rated current of 225A and below the frame for the shell type circuit breaker 400Y may be used as motor protection. Under normal circumstances, the circuit breaker can be used as infrequent line conversion and motor are not infrequent start.
Quadrupole YDZ20 MCCB is mainly used for AC 50Hz, rated voltage 400V and below, rated current of 16A to 630A three-phase four-wire system, which can ensure that users and the power is completely disconnected, To ensure safety, so as to solve any other insurmountable breaker neutral pole current is not zero defects.
YDZ20 molded case circuit breakers in the distribution network used to distribute power, and can be used as power lines and equipment overload, short circuit and under voltage protection.
Motor protection circuit breakers used in the distribution network squirrel cage motor starting and breaking as well as motor overload, short circuit and under voltage protection.
The series frame degree rated current of the transparent cover from the three-pole 100A-630A product but also with, customers can freely observe the internal operation of the product.
YDZ20 MCCB in line GB14048.2 standards. & Nbsp;

Second, model and specification

Type Meaning Note:
. a distribution no code breaker: motor protection circuit breaker with 2 represents;
. b handle direct operation No code: electric operation indicated by P; Z represents by turning the handle (Frame rating of 1250A product without turning the handle);
. c Press the rated ultimate short-circuit breaking capacity high and low points: C Cheap; Y general type; J higher type; G highest type;

Third, the accessory code

Attachment Name	instantaneous release	double release
without attachments	200	300
alarm contacts	208	308
shunt release	210	310
auxiliary contacts	220	320
undervoltage release	230	330
Shunt release Auxiliary contact	240	340
Shunt release Undervoltage release	250	350
two auxiliary contacts	260	360
auxiliary contact undervoltage release	270	370
Shunt release Alarm contact	218	318
Auxiliary contact Alarm contact	228	328
undervoltage release alarm contacts	238	338
Shunt release Auxiliary contact Alarm contact	248	348
shunt release undervoltage release alarm contacts	258	358
two auxiliary contact alarm contacts	268	368
undervoltage release Auxiliary contact Alarm contact	278	378

Fourth, the structural features

◆ YDZ20 molded case circuit breakers for the basic product is a Y-type, consisting of four part insulation shell, operating mechanism, contact system and tripping composition. The operating mechanism of the circuit breaker has the contacts and breaking the fast closing function, the "together", "minute", "re-label" and "free trip" position to the handle position to distinguish.
◆ C type, J and G YDZ20 breaker is in the Y-derived products based on the basic design is made (except C-160A outside). J-breaker is the Y-breaker contacts for structural improvements, so that in the case of short, before the agency action, moving quickly off the contact, to achieve the purpose of improving on-off capabilities.
Repulsion limiting the contact system ◆ G-breaker with a parallel conductor plate in Y-breaker after a series of composition, the system longer than the J-type contact repulsion, disconnect the distance is large, and therefore can more quickly limiting; in normal disconnect closed and in setting short-circuit trip protection action value range, by Y-type circuit breaker to complete. Once the large current or large short-circuit current in the network, the series of repulsion limiting contact quickly denounced by the electric power and open, while limiting the introduction of the arc. Denounced the contacts open process, release action, the operating mechanism of the circuit breaker so that Y-type contact breaking. Repulsion limiting the contact is due to the reduction or disappearance of current and return to the closed state.
◆ quadrupole YDZ20 MCCB neutral pole (N) is not installed tripping element, located in the right position. In the division process, the neutral pole is defined as representing a closed first contact with the other three poles, representing the other three poles disconnected after opening.
◆ C-type circuit breaker is designed to meet and below 630kVA transformer power distribution grid needs protection, through the selection of materials and simplify the structure of the economy and improvement of technology and other measures, to achieve better economic results.

Fifth, the main parameters and technical performance

1, basic parameters CM1L MCCB

Type	Poles	short circuit breaking capacity level	short circuit breaking capacity KA (V)		rated current ln (A)
			lcu/cosφ	lcu/cosφ
YDZ20C-160	3P	C	12/0.30	-	16,20,25,32,40,50,63,80,100,125,160
YDZ20Y-100	3P	Y	18/0.30	14/0.30	16,20,25,32,40,50,63,80,100
YDZ20J-100	3P, 4P	J	35/0.25	18/0.30
YDZ20G-100	3P	G	100/0.20	50/0.25
YDZ20C-225	3P	C	15/0.30	-	100,125,160,180,200,225,250
YDZ20Y-225	3P	Y	25/0.25	19/0.30	100,125,160,180,200,225
YDZ20J-225	3P, 4P	J	42/0.25	25/0.25
YDZ20G-225	3P	G	100/0.20	50/0.25
YDZ20C-400	3P	C	20/0.30	-	100,125,160,180,200,250,315,350,400
YDZ20Y-400	3P	Y	30/0.25	23/0.25	200,250,315,350,400
YDZ20J-400	3P, 4P	J	42/0.25	25/0.25
YDZ20G-400	3P	G	100/0.20	50/0.25
YDZ20Y-630	3P	Y	30/0.25	23/0.25	400,500,630
YDZ20J-630	3P, 4P	J	50/0.25	25/0.25
YDZ20Y-1250	3P	Y	50/0.25	32.5/0.25	630,700,800,1000,1250
YDZ20J-1250	3P	J	60/0.2	32.5/0.25	800,1000,1250

★ short-circuit protection circuit breaker current setting

Type	power distribution	motor protection
YDZ20 Y/J/G-100	10ln	12ln
YDZ20 Y/J/G-225	5ln and 10ln	12ln
YDZ20-400	10ln	12ln
YDZ20 J/G-400	5ln and 10ln	-
YDZ20 Y/J-630	5ln and 10ln	-
YDZ20 Y/J-1250	4ln and 7ln	-

Note: 1, YDZ20C-160,250,400 breaker, instantaneous release is not adjustable, the current setting are 10In, but instantaneous motion In≤20A, as the current is 15In, non-operating current of 8In.
2, YDZ20Y.JG-100 circuit breakers, when In≤40A, instantaneous action current level action is 600A, non-operating current is 10In.

★ inverse power distribution circuit breaker disconnect feature

ID	test current Title	Tuning Current multiple	agreed time		initial state
			In≤63	In & gt; 63
1	conventional non-tripping current	1.05In	≥1h	≥2h	cold
2	Conventional tripping current	1.30In	<1h	<2h	No. 1 test immediately after the start

★ motor protection circuit breaker disconnect inverse characteristic

ID	test current Title	Setting current multiples	agreed time	initial state
1	conventional non-tripping current	1.0In	≥2h	cold
2	Conventional tripping current	1.2In	& lt; 2h	No. 1 test immediately after the start

Note: Hot refers to conventional non-tripping currents through a predetermined state agreed time.

◆ Shunt release:
◇ rated control supply voltage: AC220V, 380V, DC24V, 110V, 220V.
◇ when between 70 and 110% of rated control supply voltage, shunt trip circuit breaker tripping should be reliable.
◇ NOTE: When the selection voltage specifications DC24V, rated current should reach 5A ± 10%
◆ undervoltage release:
◇ rated working voltage: AC220V, 380V. When the voltage drops (or even slow decline) to 70% to 35% of rated voltage, under-voltage release shall operate at below 35% of rated voltage release, undervoltage release should be able to prevent disconnection is closed, the power supply voltage is equal to or greater than 85%, should be able to ensure that the circuit breaker off.
◆ alarm contacts:
◇ rated working voltage: AC220V, thermal current: 1A.
◆ auxiliary contacts: at different fashion undervoltage releases and shunt releases can be mounted auxiliary contacts. Auxiliary contacts rating (see table);
◇ making and breaking capacity (see table): The same auxiliary contact is not energized operating performance and the number of circuit breakers, power times the number of operations for the 6050, when the circuit breaker operating performance number is less than 6050 times, then the circuit breaker equal.

frame degree rated current	Conventional thermal current (A)	rated current (A)
		AC380V	DC220V
400A and above	6	3	0.2
250A and below	3	0.26	0.14

Use Type	ON I/Ie	ON U/Ue	ON cosφ	ON	Breaking	Breaking	Breaking	Breaking	operating frequency (Times/h)	energized Time (s)
				T0.95ms	I/Ie	U/Ue	cosφ	T0.95
AC-15	10	1	0.3		1	1	0.3		120	0.05-2
AC-13	1	1		6 × Pe	1	1		6 × Pe	120	0.05-2

Note: The table 250A and below Pe = 30W. 400A and above Pe = 45W. Pe = Ue · Ie the steady-state power loss.

External accessories
★ breaker ★ electric operation after the relevant parameters and installation of electric breaker operating mechanism total height H Table.

Type	YDZ20Y, J-100	YDZ20G-100	YDZ20Y, J-225	YDZ20G-225	YDZ20Y-400	YDZ20J-400 YDZ20Y, J-630	YDZ20G-400	YDZ20Y, J-1250
height H	185	235	220	305	230	245	345	275
structure	Solenoid		Motor
voltage specifications	AC50Hz, 220V, 380V
Note: The circuit breaker with motorized operating mechanism trip trip, the electric circuit breaker operating mechanism must be deducted before closing!

★ size table manually operated mechanism mounted.

Type	YDZ20Y, J, G-100	YDZ20Y, J, G-225	YDZ20Y-400	YDZ20J, G-400 YDZ20Y, J-630
Installation dimensions H	55	85	105	80
center operating handle with respect to the circuit breaker X value	0	0	0	0

six, YDZ20 breaker structural features

YDZ20 MCCB is a Y-shaped basic products, from insulation shell, operating mechanism, contact system and the release of four components. The operating mechanism of the circuit breaker has the contacts and breaking the fast closing function, the "together", "minute", "re-label" and "free trip" position to the handle position to distinguish.
C-type, J-type and G-type circuit breaker is in the Y-derived products based on the basic design is made (except C-160A outside). J-breaker is the Y-breaker contacts for structural improvements, so that in the case of short, before the agency action, moving quickly off the contact, to achieve the purpose of improving on-off capabilities.
G-type circuit breaker is repulsion limiting the contact system of a parallel conductor plate Y-breaker after a series of composition, the system longer than the J-type contact repulsion, distance big disconnect, thus limiting more quickly stream; Under normal disconnect closed and the trip short circuit protection action setting value range, by Y-type circuit breaker to complete. Once the large current or large short-circuit current in the network, the series of repulsion limiting contact quickly denounced by the electric power and open, while limiting the introduction of the arc. Denounced the contacts open process, release action, the operating mechanism of the circuit breaker so that Y-type contact breaking. Repulsion limiting the contact is due to the reduction or disappearance of current and return to the closed state.
Four-pole circuit breaker neutral pole (N) is not installed tripping element, located in the right position. In the division process, the neutral pole is defined as representing a closed first contact with the other three poles, representing the other three poles disconnected after opening.
C Type YDZ20 breaker is designed to meet and below 630kVA transformer grid distribution protection needs, through the selection of materials and simplify the structure of the economy and improvement of technology and other measures, to achieve better economic results.

seven, YDZ20 Breaker shape and installation dimensions

Type	Dimensions (mm)
	Front connection
	W		L	H	W1		L1	L2	H1	H2	H3	W2	L4	L5	H6
	3P	4P			3P	4P
YDZ20Y-100	105	-	165	86.5	70	-	-	215	103	26.5	26.5	26	69	28.5	4
YDZ20J-100 (W)	105	140	165	86.5	70	105	-	215	103	26.5	26.5	26	69	28.5	4
YDZ20G-100	105	-	165	140	70	-	-	218.5	156.5	26.5	80.5	26	69	28.5	4
YDZ20C-160	108	-	155	84	70	-	-	-	106.5	34	34	30	66	32	4.5
YDZ20Y-225	109	-	256.5	105	70	-	329	402	142	19.5	19.5	35	89	53	6.5
YDZ20J-225 (W)	109	144	256.5	105	70	105	329	402	142	19.5	19.5	35	89	53	6.5
YDZ20G-225	109	-	256.5	187	70	-	329	402	227	38	103.5	35	89	53	6.5
YDZ20C-250	109	-	208	105	70	-	300	-	142	19.5	19.5	35	89	44	6
YDZ20C-400	155	-	276	112	102	-	391	450	149.5	32.5	32.5	52	88	72	5
YDZ20Y-400 (W)	155	-	276	112	102	-	391	450	149.5	32.5	32.5	52	88	72	5
YDZ20J-400 (W)	210	280	268	112	140	210	378	425	150	21.5	21.5	62	90	55	5.5
YDZ20G-400	210	-	268	208	140	-	378	394	247	75	121.5	62	90	55	5.5
YDZ20C-630	210	-	268	112	140	-	378	425	150	21.5	21.5	62	90	55	5.5
YDZ20Y-630 (W)	210	-	268	112	140	-	378	425	150	21.5	21.5	62	90	55	5.5
YDZ20J-630 (W)	210	280	268	112	140	210	378	425	150	21.5	21.5	62	90	55	5.5
YDZ20Y-1250	210	-	406	122	140	-	548	588	180	26	26	78	100	143	16
YDZ20J-1250	210	-	406	122	140	-	548	588	180	26	26	78	100	143	16

Type	Dimensions (mm)					Installation dimensions (mm)
	Front connection
	W1		L3	H4	H5	A	B	φd
	3P	4P
YDZ20Y-100	70	-	147	55.5	55.5	35	126	5
YDZ20J-100 (W)	70	105	147	55.5	55.5	35	126	5
YDZ20G-100	70	-	147	55.5	55.5	35	126	5
YDZ20C-160	70	-	141	64	64	35	135	4.5
YDZ20Y-225	70	-	212.5	47	90	35	196.5	4.5
YDZ20J-225 (W)	70	105	212.5	47	90	35	196.5	4.5
YDZ20G-225	70	-	212.5	47	100	35	196.5	4.5
YDZ20C-250	70	-	184	75	128	35	172	4.5
YDZ20C-400	102	-	247	80	125	51	240	7
YDZ20Y-400 (W)	102	-	247	80	125	51	240	7
YDZ20J-400 (W)	140	210	233	90	90	70	200	7
YDZ20G-400	140	-	233	85	119	70	200	7
YDZ20C-630	140	-	233	92	92	70	200	7
YDZ20Y-630 (W)	140	-	233	92	92	70	200	7
YDZ20J-630 (W)	140	210	233	92	92	70	200	7
YDZ20Y-1250	140	-	375	-	-	70	375	9
YDZ20J-1250	140	-	375	-	-	70	375	9

Nine, ordering instructions

When ordering indicate the following points:
Product type and name: If YDZ20 MCCB -630/3318
Instantaneous tripping Current Rating: such as 630A.
Breaker attachment names, specifications, combination code, adopted when the undervoltage release and shunt trip, should indicate the operating voltage (or control supply voltage) value;
Uses: power distribution
Wiring: rear Front connection, Rear connection.
Poles: 4P
Order number: as 230.
Ordering example: YDZ20 -630/3318,4P, AC380V, 630A, 3500 只.