Can Carry 125A Miniature Circuit Breaker Knb1-125 MCB 10ka with Good Copper Silver Contact IEC60898/60947

• Customization: Available
• Breaking Capacity: Low Voltage Circuit Breakers
• Operation: Electric Type
• Model NO.: KNB1-125
• Arc-extinguishing Medium: Air
• Structure: MCB
• Type: Circuit Breaker
• Function: Conventional Circuit Breaker, Circuit-Breaker Failure Protection, Overcurrent Protection
• Certification: ISO9001-2000, CE, CB, CCC
• Release Type: B C D
• ISO: ISO9001 ISO14001
• Rated Working Voltage: 240V/415V
• Making and Breaking Capacity: 10ka
• Mechanical Life: 20000
• Electric Life: 4000
• Rated Frequency: 50/60Hz
• Pole: 1,2,3,4
• Rated Working Current: 63A,80A,100A,125A
• Transport Package: Carton
• Specification: 1P 7.78x7.85x17.8mm
• Trademark: KORLEN
• Origin: China
• HS Code: 8536200000
• Production Capacity: 2000000/Month

Product Description

	Standard		IEC/EN 60898-1	IEC/EN 60947-2
Electrical features	Rated current In	A	1, 2, 3, 4, 6, 10, 13, 16, 20, 25, 32, 40, 50,63
	Poles		1P, 1P+N, 2P, 3P, 3P+N, 4P	1P, 2P, 3P, 4P
	Rated voltage Ue	V	230/400~240/415
	Insulation voltage Ui	V	500
	Rated frequency		50/60Hz
	Rated breaking capacity	A	10000	10000
	Energy limiting class		3
	Rated impulse withstand voltage(1.2/50) Uimp	V	4000
	Dielectric test voltage at ind. Freq. for 1 min	KV	2	1.890
	Pollution degree		2
	Power loss per pole		Rated current (A)	Max power loss per pole (W)
			1, 2, 3, 4, 6, 10	2
			16, 20, 25, 32	3.5
			40, 50, 63	5
	Thermo-magnetic release characteristic		B, C, D	(8-12)In
Mechanical features	Electrical life		4000
	Mechanical lif		20000
	Contact position indicator		YES
	Protection degree		IP20
	Reference temperature for setting of thermal element	ºC	30
	Ambient temperature (with daily average≤35ºC)	ºC	-5...+40
	Storage temperation	ºC	-25...+70
Installation	Terminal connection type		Cable/U-type busbar/Pin-type busbar
	Terminal size top/bottom for  cable	mm2	25
		AWG	18-4
	Terminal size top/bottom for  busbar	mm2	10
		AWG	18-8
	Tightening torque	N·m	2.5
		In-Ibs.	22
	Mounting		On DIN rail EN 60715 (35mm) by means of fast clip device
	Connection		From top and bottom
Combination with accessories	Auxiliary contact		YES
	Shunt release		YES
	Under voltage release		YES
	Alarm contant		YES

 

1. 1. Selectivity

 

Load side: K    NB1-63, KNB1-63H Curve B, C	In (A)	Power supply side: RT36-00 (fuse)
		20	25	36	50	63	80	100	125	160
		Is (kA)
	≤2	1.2	4	>12	>12	>12	>12	>12	>12	>12
	3	0.7	1.2	3.8	5.3	6	6	6	6	6
	4	0.6	0.9	2.5	3.8	6	6	6	6	6
	6	0.5	0.8	1.9	2.5	4.5	5	6	6	6
	10		0.7	1.4	2.2	3.2	3.6	6	6	6
	16			1.2	1.8	2.6	3	5.6	6	6
	20				1.5	2.2	2.5	4.6	6	6
	25				1.3	2	2.2	4.1	5.5	6
	32					1.7	1.9	3.8	4.5	6
	40						1.7	3	4	5
	50						1.5	2.6	3.5	4.5
	63							2.4	3.3	4.5

 

Load side: KNB1-63, KNB1-63H Curve B, C	In (A)	Power supply side: NM8-100S/H/R
		16	20	25	32	40	50	63	80	100
		Is (kA)
	≤10	0.19	0.19	0.3	0.4	0.5	0.5	0.5	0.63	0.8
	16			0.3	0.4	0.5	0.5	0.5	0.63	0.8
	20					0.5	0.5	0.5	0.63	0.8
	25						0.5	0.5	0.63	0.8
	32							0.5	0.63	0.8
	40								0.63	0.8
	50									0.8
	63

1. 1. Backup protection

 

Load side:K NB1-63, KNB1-63H Curve B, C	In (A)	Power supply side: RT16 series
		40	50	63	80	100	125	160
		Is (kA)
	1~6	40	40	40	40	40	40	40
	8~10	40	40	40	40	40	40	40
	13	40	40	40	40	35	35	35
	16	40	40	40	40	30	30	30
	20	40	40	40	40	30	30	30
	25	40	40	40	40	30	30	30
	32	40	40	40	40	30	30	30
	40	40	40	40	40	30	30	30
	50	30	30	30	30	30	30	30
	63	20	20	20	20	15	15	15

 

Load side: KNB1-63, KNB1-63H Curve B, C	In (A)	Power supply side: NM8
		NM8-125S	NM8-125H	NM8-125R	NM8-250S	NM8-250H	NM8-250R
		Is (kA)
	1~6	15	18	18	15	15	15
	10~20	12	15	15	12	12	12
	32~40	12	15	15	12	12	12
	50~60	12	15	15	12	12	12

 

1. 1. Temperature derating

The maximum permissible current in a circuit breaker depends on the ambient temperature where the circuit breaker is
placed. Ambient temperature is the temperature inside the enclosure or switchboard in which the circuit breakers are installed.

The reference temperature is 30ºC

 

Ambient temperature
	-35ºC	-30ºC	-20ºC	-10ºC	0ºC	10ºC	20ºC	30ºC	40ºC	50ºC	60ºC	70ºC
Rated current(A)
1	1.30	1.26	1.23	1.19	1.15	1.11	1.05	1.00	0.96	0.93	0.88	0.83
2	2.60	2.52	2.46	2.38	2.28	2.20	2.08	2.00	1.92	1.86	1.76	1.66
3	3.90	3.78	3.69	3.57	3.42	3.30	3.12	3.00	2.88	2.79	2.64	2.49
4	5.20	5.04	4.92	4.76	4.56	4.40	4.16	4.00	3.84	3.76	3.52	3.32
6	7.80	7.56	7.38	7.14	6.84	6.60	6.24	6.00	5.76	5.64	5.28	4.98
10	13.20	12.70	12.50	12.00	11.50	11.10	10.60	10.00	9.60	9.30	8.90	8.40
16	21.12	20.48	20.00	19.20	18.40	17.76	16.96	16.00	15.36	14.88	14.24	13.44
20	26.40	25.60	25.00	24.00	23.00	22.20	21.20	20.00	19.20	18.60	17.80	16.8
25	33.00	32.00	31.25	30.00	28.75	27.75	26.50	25.00	24.00	23.25	22.25	21.00
32	42.56	41.28	40.00	38.72	37.12	35.52	33.92	32.00	30.72	29.76	28.16	26.88
40	53.20	51.20	50.00	48.00	46.40	44.80	42.40	40.00	38.40	37.20	35.60	33.6
50	67.00	65.50	63.00	60.50	58.00	56.00	53.00	50.00	48.00	46.50	44.00	41.50
63	83.79	81.90	80.01	76.86	73.71	70.56	66.78	63.00	60.48	58.90	55.44	52.29

When several simultaneously operating circuit breakers are mounted side by side in a small enclosure, the temperature rise inside the enclosure causes a reduction in current rating.
You must then assign the rating (already derated if necessary according to ambient temperatuer) a downrating factor of 0.8.