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SKG1 Load Isolation Switch

SKG1 series is a device that isolates the de-energized section from the energized part by creating a visible break point. It is used for isolating faulty equipment or performing power-off maintenance in power distribution systems and automation systems across buildings, power utilities, petrochemical industries, and other sectors. The device is suitable for applications with rated voltage below AC600V and rated current ranging from 125A to 3200A.

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Load isolation switch High current isolation switch Double-break safety switchgear Industrial power distribution equipment IP20 rated electrical isolator

Product Description

Standards

• IEC60947-1/GB/T ·14048.1-2000

• IEC60947-3/GB ·14048.3

• IEC60947-6-1/GB ·14048.11

• Advantages and Features

• Good safety performance

In the SKG1 series load isolation switches, a composite contact is mounted and a spring loaded accumulator, an instantaneous release ac-celerating mechanism, momentary make and break and a double break contact structure are adopted in the operation mechanism, which has nothing to do with the intensity of the operation handle, thus improving extremely the electric and the mechanical performances.

• High reliability

• precise, flexible, and smooth in switch transfer.

• Service life up to more than 8,000 times.

• Strong in anti-interference ability without outward interference.

• Beautiful in outer appearance, small in volume and light in weight.

• As required, front operation, side operation, inside-cabinet operation or outside-cabinet operation are provided.

Working conditions and installation modes

Name	Application environment requirements
Operating Temperature	-2010+45C.The average value shall be no more than +35C within 24h
Operating Humidity	The average humidly shall be no more than 50% wthoutcondensationat+40°C
Altitude	Less than 2000meters and if used at higher than 2000 meters, please use the product at lower ratings
Vibration and Gas	The environment, in which the product is used, shall be free of strong vibration or shock and corroded metal or harmful gas doing damage to insulation
Surrounding matter	There shall be no serious dust, conductive particles or explosive and dangerous substances
Pollution classification	Grade Ⅲ
IP classification	IP 20
Storage requirements	Stored at-30 to70C.in an environment drying without corrosion or salts and the longest period of storage shall be more than 1 year
Installation method	Horizonal vertical installation
Incomingline	Up the line, Upside down line

Technical dates

Agreed thermal current Ith(A)			125A	160A	200A	250A	315A	400A	500A	630A	800A	1000A 1250A		1600A	2000A	2500A	3200A
Rated insulation voltage Ui(V)			750	750	750	750	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000
Dielectirc strength V			5000	5000	5000	5000	8000	8000	8000	8000	8000	10000	10000	10000	10000	10000	10000
Rated impulse withstand voltage Uimp Installtion category: IV			8	8	8	8	12	12	12	12	12	12	12	12	12	10	10
Rated work current le(A) 380V AC21			125	160	200	250	315	400	500	630	800	1000	1250	1600	2000	2500	3200
AC22			125	160	200	250	315	400	500	630	800	1000	1250	1600	2000	2500	3200
AC23			125	160	200	250	315	340	425	536	630	800	1000	1280	1600	2000	2200
600V AC21			125	160	160	200	315	400	400	500	800	1000	1000	1600	2000	2500	3200
AC22			125	125	125	160	200	200	200	315	630	630	630	800	1600	1800	2400
AC23			50	63	70	80	125	125	125	125	400	400	400	500	1000	1000	1200
200V AC21			125	160	200	250	315	400	500	630	800	1000	1250	1600	2000	2500	3200
AC22			125	160	200	250	315	400	400	500	800	1000	1250	1250	1600	1800	2400
AC23			125	125	160	200	315	400	400	500	800	1000	1250	1250	1600	1800	2000
440V AC21			100	125	160	200	315	400	400	500	800	1000	1250	1600	2000	2500	3200
AC22			100	125	160	200	315	400	400	500	800	1000	1250	1250	1600	1800	2400
AC23			100	125	160	200	315	400	400	500	800	1000	1000	1000	1000	1000	1200
Rated short-time withstand curent 1cw(KARms)0.1s/1.0s			10/7	10/7	16/10	16/10	25/18	25/18	25/18	25/18	26/18	90/50	90/50	90/50	90/50	90/50	90/50
Rated breaking capability 1cn(ARms)AC23 380V			1000	1000	1600	1600	2500	3200	3200	3200	6400	8000	8000	8000	8000	8000	8000
Rated connection capabiy 1cn(ARms)AC23 380V			1250	1250	2000	2000	3150	4000	4000	4000	8000	10000	10000	10000	10000	10000	10000
Rated short-circuit making capaciy 1cm(KA peak value)		12	12	12	17	17	30	30	30	30	40	70	70	70	70	70	70
Mechanical service life(number of opening cycles)				10000	10000	10000	5500	5500	5500	5500	4000	4000	4000	3000	3000	3000	3000
COSφ=0.95 AC21			1500	1500	1500	1500	750	750	750	750	600	600	600	450	450	450	450
Rated voltage Ue660V COSφ=0.65AC22			1000	1000	1000	1000	500	500	500	500	400	400	400	300	300	300	300
Rated current le COSφ=0.35 AC23			500	500	500	500	250	250	250	250	200	200	200	150	150	150	150
Operation torque	6.5		6.5	6.5	10	10	14.5	14.5	14.5	14.5	27	27	27	27	27	27	27
Weight(KG) 3Poles			1	1	2	2	3.5	3.5	4	4	10.5	10.5	10.5	16	25	30	40
4Poles			1.5	1.5	2.5	2.5	4	4	4.5	4.5	13	13	13	20	32	37	51

SKG1-125A-630A Load isolation switch outline and installation

SKG1-125A~630A Direct operation

installation dimensions

Outside-cabinet operation installation bottom-plate

Type	Outline dimensions and installation dimensions
In	A	A1	B	C	D	D1	E	φL	J	J1	K	N	P	R	s	T	U	φX	Y	F	H
25A/3 140		50	135	116	27	92	71	5.5	120	120	65	85	36	20	235	3.5	85	9	24	52	10
25A/4 170		50	135	116	27	92	71	5.5	150	150	65	85	36	20	235	3.5	85	9	24	52	10
60A/3 140		50	135	116	27	92	71	5.5	120	120	65	85	36	20	235	3.5	85	9	24	52	10
60A/4 170		50	135	116	27	92	71	5.5	150	150	65	85	36	20	235	3.5	85	9	24	52	10
200A/3 180		60	170	128	35	104	83	5.5	160	160	90	115	50	25	290	3.5	110	11	25	79	13
200A/4 230		60	170	128	35	104	83	5.5	210	210	90	115	50	25	290	3.5	110	11	25	79	13
250A/3 180		60	170	128	35	104	83	5.5	160	160	90	115	50	25	290	3.5	110	11	25	79	13
250A/4 230		60	170	128	35	104	83	5.5	210	210	90	115	50	25	290	3.5	110	11	25	79	13
315A/3 230		85	240	169	50	133	113	7	210	210	140	145	65	32	400	5	160	11	36	100	24
315A/4 290		85	240	169	50	133	113	7	270	270	140	145	65	32	400	5	160	11	36	100	24
400A/3 230		85	240	169	50	133	113	7	210	210	140	145	65	32	400	5	160	11	36	100	24
400A/4 290		85	240	169	50	133	113	7	270	270	140	145	65	32	400	5	160	11	36	100	24
500A/3 230		85	260	260	50	133	113	7	210	210	140	145	65	40	400	6	160	12	36	100	24
500A/4 290		85	260	260	50	133	113	7	270	270	140	145	65	40	400	6	160	12	36	100	24
630A/3 230		85	260	260	50	133	113	7	210	210	140	145	65	40	400	6	160	12	36	100	24
630A/4 290		85	260	260	50	133	113	7	270	270	140	145	65	40	400	6	160	12	36	100	24

SKG1-1000A~3150A load isolation switches


Type	Outline dimensions and installation dimensions
In	A	A1	B	D	E	F	G	J	J1	N	R	s	T	U	Y1	Y2	Q
000A/3 378		105	312					353	353	186	60	480	8	200			311
000A/4 492		105	312			16		467	467	246	60	480	8	200			311
250A/3 378		105	338	20	40	16	35	353	353	186	80	480	8	200			311
250A/4 492		105	338	20	40	16	35	467	467	246	80	480	8	200			311
600A/3 378		105	338	20	40	16	35	353	353	186	80	480	10	200			311
600A/4 492		105	338	20	40	20	35	467	467	246	80	480	10	200			311
2000A/3 378			455	20	40	20	40	353	353	186	80	560	10	200	75.5	227.5	311
2000A/4 492			455	20	40	20	40	467	467	246	80	560	10	200	75.5	227.5	311
2500A/3 378			455	20	40	20	40	353	353	186	80	560	10	200	75.5	227.5	311
2500A/4 492			455	20	40	20	40	467	467	246	80	560	10	200	75.5	227.5	311
3150A/3 378			505	35	50	25	50	353	353	186	120	560	15	200	78	230	311
3150A/4 492			505	35	50	25	50	467	467	246	120	560	15	200	78	230	311

FAQ

Q1: What are the main functions and application scenarios of the SKG1 series load isolation switch?

Answer:

1. Function: Isolates de-energized sections from energized parts via visible break points, used for fault equipment isolation or power-off maintenance.

2. Applications: Power distribution systems in buildings, utilities, petrochemical industries, etc., suitable for rated voltage below AC600V and current from 125A to 3200A.

Q2: What are the technical advantages of the SKG1 series in safety and reliability?

Answer:

1. Safety Design:

o Composite contacts and spring-loaded accumulator ensure operation independent of handle force;

o Instantaneous release accelerating mechanism + double break contact structure enhance electrical/mechanical performance.

2. High Reliability:

o Precise switching with a lifespan exceeding 8,000 cycles;

o Strong anti-interference, compact design, and multiple operation modes (front/side/in-cabinet/out-cabinet).

Q3: What are the working conditions and installation constraints for the SKG1 series?

Answer:

1. Environmental Conditions:

o Temperature: -20℃ to +45℃ (24h average ≤+35℃);

o Humidity: ≤50% at 40℃ (no condensation);

o Altitude: ≤2000m (derating required above 2000m);

o No strong vibration, corrosive gases, or explosive substances; Pollution Degree III, IP20 protection.

2. Installation: Horizontal/vertical mounting, optional top/bottom line entry; Storage temperature: -30℃ to 70℃.

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