YCM6i Series Molded Case Circuit Breaker(MCCB)

Type designation

Notes:

Classified into Type L(standard type)and Type M(high breaking type)according to the level of rated ultimate short-circuit breaking capacity.

No code for direct handle operation;code “P”for electric operation;code “Z”for rotating handle operation.

No code for power distribution circuit breakers;code“2”for motor protection circuit breakers.The products are divided into 3-pole and 4-pole types.Among 4-poe products,the neutralpole(N-pole)has 2 types:

Type A:No overcurrent tripper is installed on the N-pole,and the N-pole is always on and does not switch on or off together with the other three poles.

Type B:No overcurrent tripper is installed on the N-pole,and the N-pole switches on and off together with the other three poles (the N-pole switches on first and off last).

Type designation

1.Ambient temperature:-5℃~+40℃

2.Altitude:2000m

3.Humidity:The relative humidity of air shall not exceed 50%at+40°℃.

4.Pollution degree:Grade 3

5.Installation category:Category Ⅲ

6.Places free from rain and snow erosion.

7.Places free from metals,gases that damage insulation,and conductive dust.

8.Places free from explosive media and media that are corrosive enough to damage the product.

9.Installation method:Vertical installation,horizontal installation.

10.Transportation and Storage Conditions:Between-25℃ and+55℃ under normal conditions.

11.Short-term temperature:It can reach up to+70℃ for a short period (24 hours).

Protection Characteristics

Tripper Operation Performance

For Power Distribution

Rated Operating Current of Tripper(In)	Thermal Tripper(Reference Temperature 40℃)		Electromagnetic Tripper Operating Current (A)	Remarks
	1.05In [Cold State]Non- operation Time	1.30In(Hot State) Operation Time
10	≥1	<1	10ln ±20%	Power distribution protector.Note: For 1000A,it's 7In±20%
63	≥2	<2	10ln ±20%
100	≥2	<2	5In ±20% 7In ±20% 10In±20%
Note:Circuit breakers with a rated current less than 160A do not have tripping at 5In current.

For Motor Protection

Rated Operating Current of Tripper(In)(A)	Thermal Tripper(Reference Temperature 40℃)				Electromagnetic Tripper Operating Current (A)
	1.0ln [Cold State]Non- operation Time(h)	1.20In (Hot State) Operation Time(h)	1.50In (Hot State) Operation Time(h)	7.2ln [Cold State]Non- operation Time(h)
10	≥2	≤2	8min	6s	12In±20%

Power Loss

Circuit Breaker Power Loss

Model	Energized current	Three-pole Total Power Loss(W)
		Front-panel wiring, rear-panel wiring	Plug-in front-panel wiring	Plug-in rear-panel wiring
YCM6i-63/125 (L,M)Direct heating type(10A-25A)	25	28	1	32
YCM6i-63/125(L,M)Indirect heating type(32A-63A)	63	20	/	24
YCM6i-160(L,M)Indirect heating type(32A-100A)	125	35	37	40
YCM6i-250(L,M)	250	62	66	70
YCM6i-400/630(L,M)	400	115	120	125
YCM6i-800(L,M)	630	187	193	200
YCM6i-1000(M)	800	262	/	300

Derating Factor

Derating Factor of Circuit Breaker with Ambient Temperature Change

Model	Derating Factor(In)
	+40℃	+45℃	+50℃	+55℃	+60℃
YCM6i-63/125	1	0.94	0.88	0.81	0.74
YCM6i-160	1	0.96	0.91	0.85	0.78
YCM6i-250	1	0.97	0.94	0.90	0.86
YCM6i-400/630	1	0.95	0.89	0.82	0.75
YCM6i-800	1	0.94	0.88	0.82	0.76
YCM6i-1000	1	0.94	0.87	0.80	0.72
Notes:The above derating factors are measured under the frame-level rated current.

Technical data

Frame rating current Inm(A)			63/125		160		250		400		630		800		1000
Rated current In(A),40℃			10,16,20,25, 32,40,50,63, 80,100,125		25,32,40,50, 63,80,100, 125,160		125,160,180, 200,225,250,		250,315,350,400		400,500,630		630,700,800		800, 1000
insulation voltage Ui(V)			800		1000		1000		1000		1000		1140		1140
Rated impulse withstand voltage Uimp(KV)			8		12		12		12		12		12		12
Rated operating voltage Ue (V)			400,690		400,690		400,690		400,690		400,690		400,690		400,690
Selectivity category			A		A		A		A		A		A		A
Arcing distance(mm)			<50		<50		<50		<50		<100		<100		<120
Operating performance (times)	Electrical life (with current supply)		1500		1000		1000		1000		1000		500		500
	Mechanical life (without current supply)		8500		7000		7000		4000		4000		2500		2500
Breaking capacity class			L	M	L	M	L	M	L	M	L	M	L	M	L	M
Number of poles	3P		■	■	■	■	■	■	■	■	■	■	■	■	■	■
	4P		■	■	■	■	■	■	■	■	■	■	■	■	■	■
Rated ultimate short-circuit breaking capacity Icu(kV)	Ue=AC400V		35	50	35	85	35	85	50	100	50	100	75	100	75	100
Rated service short-circuit breaking capacity Ics(kV)			20	35	22	50	22	50	35	75	35	75	50	65	50	65
Overall dimensions Width (W)×Height(H)×Depth (D)	W	3P	75		92	72	107		150		150		182		210
		4P	100		122	122	142		198		198		240		280
	H		130		130	130	165		257		257		270		280
	D		67		77.5		78		110		110		118		120
Notes:The   symbol““indicates   not   applicable,The   symbol““indicates   applicable.
Notes:For models 63-125,the minimum instantaneous operating curent is 40A,and those below 40A are equivalent to 40A.For the  160 frame size,the instantaneous operating current below 50A is equivalent to 50A.
Note:For the 2P version of models 125-250,refer to the detailed dimension page for overall and installation dimensions.

Characteristic Curve

Description: The characteristic curve is measured under cold conditions and three-phase load.

Inner accessories

 

Overall and mounting dimensions(mm)

 

Overall and mounting dimensions(mm)