AUTOMATIC TRANSFER SWITCHES
Contents
- Overview P01

- Specification P02

- Dimension P05

- Installation Precautions P10

AUTOMATIC TRANSFER SWITCHES

Overview
XSTN is a three position automatic transfer switch. It can switch between two different power source immediately
(or delay by a set of time) when receiving a switching signal, or it can switch to a neutral position where no power
source is connected.
It is used in an emergency power supply system with operation voltage of AC380/400/415V, 50/60 Hz, and current
of 16-5000A.
The product is comply with IEC60947-6-1.

Feature
• Reliable mechanical interlock: Unique structure, ensuring only one set of power source can be input at a time.
• Superior arc suppression performance: Eliminated all kinds of abnormal arc and shorten the duration, reduce
contact consumption.
• Multi-piece main arc contact: Increase surface contact area and contact pressure, avoiding overheating or contact
melting, increase contact lifespan.
• Simple structure with small volume: Reliable to use, low failure rate, easy installation, use and maintenance
• Fast switching time: Prompt switching time between main power source and backup power source. Switching time
can also be set by user.

Type Designation

Model Type Frame Size Design Pole Controller Rated Current Add-on

16 125 800
63
20 160 1000
125
25 200 1250
250 Blank: none
2 32 225 1600
500 K5: XST-5 H: communication
XST N H 3 40 250 2000
800 K6: XST-6 +
4 50 350 2500
1250 current monitor
63 400 3200
2500
80 500 4000
5000
100 630 5000

Note:
1. 2 pole only suitable for frame size below 500AF(including)
2. Add-on can only be choose for XST-6 type

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 AUTOMATIC TRANSFER SWITCHES
ATS Specif ication

Frame Size 63 125 250 500

Insulation Voltage, Ui AC800V

Rated Impulse Withstand

12kV
Voltage, Uimp

2P: AC220 / 230 / 240V

Rated Voltage, Ue
3/4P: AC380 / 400 / 415V

Control Voltage , Us AC220 / 230 / 240V, 50/60Hz

16, 20 , 25, 32,

Rated Current, In (A) 80, 100, 125 160, 200, 225, 250 350, 400, 500
40, 50, 63

Pole 2 3 4 2 3 4 2 3 4 2 3 4

Operation AC220 / 230

3 3 4 3 3 4 5 5 5 5 5 6
current (A) / 240V

Tripping AC220 / 230

1 1.4
current (A) / 240V

Rated condition short

100kA 100kA 120kA 120kA
circuit current (fuse)

Rated condition short

50kA 50kA 65kA 65kA
circuit current (breaker)

AC-33B: Making & Breaking: 10Ie, cosφ=0.35 (Ie≤100A, cosφ=0.45)

Making and Breaking Capacity
DC-33B: Making & Breaking: 4Ie, L/R=2.5ms

I -> II
Switching time ≤1s
II -> I

Electrical: 6000
Endurance
Mechanical: 20000

Switching frequency 120 times / hr

2NO2NC on both source

AC110V, 5A
Auxiliary switch
AC220V, 3A
DC220V, 0.2A

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AUTOMATIC TRANSFER SWITCHES

ATS Specif ication

Frame Size 800 1250 2500 5000

Insulation Voltage, Ui AC800V

Rated Impulse Withstand

12kV 8kV
Voltage, Uimp

Rated Voltage, Ue 3/4P: AC380 / 400 / 415V

Control Voltage , Us AC220 / 230 / 240V, 50/60Hz

Rated Current, In (A) 630, 800 1000, 1250 1600, 2000, 2500 3200, 4000, 5000

Pole 3 4 3 4 3 4 3 4

Operation AC220 / 230

6 6 6 8 10 12 18 20
current (A) / 240V

Tripping AC220 / 230

2
current (A) / 240V

Rated condition short

120kA 120kA – 120kA
circuit current (fuse)

Rated condition short

50kA 50kA 50kA –
circuit current (breaker)

AC-33A: Making & Breaking: 10Ie, cosφ=0.35 (Ie≤100A, cosφ=0.45) (5000A)

Making and Breaking Capacity AC-33B: Making & Breaking: 10Ie, cosφ=0.35 (Ie≤100A, cosφ=0.45)
DC-33B: Making & Breaking: 4Ie, L/R=2.5ms

I -> II
Switching time ≤1s
II -> I

Electrical: 6000
Endurance
Mechanical: 20000 (10000 for 1250AF and above)

Switching frequency 120 times / hr

2NO2NC on both source

AC110V, 5A
Auxiliary switch
AC220V, 3A
DC220V, 0.2A

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 AUTOMATIC TRANSFER SWITCHES
Appearance
1. Source I terminal 7. Control circuit terminal
2. Power indicator 8. Insulation barrier
3. Selection button 9. Arc chamber cover
4. Tripping button 10. Auxiliary contact cover
5. Manual operation handle axis 11. Source II terminal
6. Nameplate 12. Load terminal (under Source II terminal)
1 8

2
9
3

4 10

5
11
6

7 12

Internal Wiring Diagram

ⅠLine
Ⅰ1 Ⅱ1 ⅠT1 ⅡT1

Load
AX BX ⅠTS1 ⅡTS1
2 3
LS
TC
S1 5 6
C
S1 SC
LS S1
ⅠSW ⅡSW
ⅠTS2 ⅡTS2 1 4
AUX(SW)

Ⅰ2 Ⅱ2 ⅠT2 ⅡT2
ⅡLine
C = Coil ITS1, ITS2 = Source I breaking terminal I1--I2 = Source I making terminal
SC = Selection coil IITS1, IITS2 = Source II breaking terminal II1--II2 = Source II making terminal
TC = Selection coil AX, BX = Control IT1--IT2 = Source I tripping terminal
S1 = Rectifier Auxiliary switch IIT1--IIT2 = Source II tripping terminal
LS = Line switch

I1 I2 II1 II2 IT1 IT2 IIT1 IIT2

◇ I1/ I2: Transferring to position I input signal terminal.

◇ II1/ II2: Transferring to position II input signal terminal.
◇ IT1/ IT2: Position I transferring to position 0 input signal terminal.
◇ IIT1/ IIT2: Position II transferring to position 0 input signal terminal.
◆ Rated voltage AC220V/230V/240V.
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AUTOMATIC TRANSFER SWITCHES

ATS Specif ication

XST-5 and XST-6 controllers are usable with the XSTN series three-section PC-class 2P/3P/4P dual power transfer
switch, with frame size from 63AF to 5000AF with the functions of automatic transfer in case of occurrence of power
faults such as under-voltage, over-voltage fault, under-frequency fault, over-frequency fault, unbalance phase
voltage fault and inverse sequence fault. Current measurement or communication function can be add-on for
current measurement and remote communication purpose to ease up management.

Model Description
XST - □/ □ / □
Product Type Poles Optional functions

5: Standard Null: without accessory

2 : 2P
XST 3 : 3P
4 : 4P Null: without accessory
6: Multifunction
H: Current measurement + communication

Note:
1. The current measurement should be equipped with different current
transformer according to different rated current of product.
2. 2P/4P can be shared, 3P does not.

Working Conditions

Controller XST-5 XST-6

Rated operation voltage (V) AC380/220、AC400/230、AC415/240

Rated operation frequency (Hz) 50/60

Operation voltage (V) 165~300(Phase voltage)

Operation temperature (ºC) -25~60

XST-5 controller XST-6 controller

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 AUTOMATIC TRANSFER SWITCHES
Function List

Main functions XST-6 XST-5

Mains - Mains ■ ■
Power supply type
Mains - Generator ■ ■
Automatic ■ ■
Operation mode
Manual ■ ■

Work mode Automatic Back ■ ■

(Automatic) Manual Back ■ ■
Voltage ■ ■
Voltage unbalance ■  
Monitor Phase sequence ■  
Frequency ■  
Current □  
Voltage-loss (open-phase) ■ ■
Under-voltage ■ ■
Over-voltage ■ ■
Transfer Under-frequency ■  
Over-frequency ■  
Voltage unbalance ■  
Inverse sequence ■  
Switch delay T1 ■ ■
0 position stay delay T2 ■ *
Delay Time Back switch delay T3 ■ ■
Function
R-power available delayT4 ■ *
Generator stop delay T5 ■ *
Remote Control to I ■  
Remote Control to II ■  
Input
Remote Control to O ■  
Fire control ■ ■
Generator control ■ ■
Output Load control ■  
Programmable output ■ ■
Switching record ■  
Fault record ■  
Alarm ■ ■
Other
Communication □  
System time ■  
Password ■  

■: Standard function □: Optional function *: fixed time

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AUTOMATIC TRANSFER SWITCHES

Dimension

16-63A A B
2P 217 88

A
3P 239 110

B 22 4P 261 132
17.4

18.5
12 120

9
7

13
152

190
30
9-M6

3-φ6.8 Safety distance

23 22 22 24 2
7
17

50 30

XSTN 16-63A

80-125A A B
2P 233 103
A 3P 263 133
B 22
4P 293 163
26
15 120
19

13
9
7

152
195

30
9-M8

3-φ6.8 Safety distance

23 30 30 28 4
9
20

50 30

XSTN 80-125A

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 AUTOMATIC TRANSFER SWITCHES
Dimension

160-250A A B
2P 243 113
A 3P 278 148
B 22 4P 313 183
30
20 120
19
13

9
7

152

195
30
9-M8

3-φ6.8 Safety distance

23 35 35 24 4
9
20

50 30

XSTN 160-250A

350-500A A B
2P 305 167
A
3P 366.5 228.5
B 17 4P 428 290
47
40 140
3

30
200

290

9-φ14

3-φ9 30
47
20 20
55

Safety distance 5
23 61.5 61.5 44 60 35

XSTN 350-500A

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AUTOMATIC TRANSFER SWITCHES

Dimension

65 65 80

30
Model 630A 800A

20
A 3P 407 407
18.5

43
A 4P 472 472

210
φ1
B 3P 375 375
B 4P 440 440

C 10 15

A
170

127
15
394
360

*450
415

127
C
*45
B

62.5
4

“*”Safety distance
φ1
4-

XSTN 630-800A

80 80 89

50
20

Model 1000A 1250A

40
83
19

A 3P 454 454

A 4P 534 534
253
4
φ1

B 3P 420 420

B 4P 500 500
C 12 15

A
170
C
128.5
15
394
360

*430
415

128.5
C
61

*45
B
“*”Safety distance
14
4-φ

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XSTN 1000-1250A
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 AUTOMATIC TRANSFER SWITCHES
Dimension

215 100 100 100

75

20
40

40
92
15

Model A B

257
14

3P 515 480

4P 615 580

A
165

15

117
15
*430
394
360
425

117
15
57.5
*45
B
4
φ1

“*”Safety distance
4-

XSTN 1600A

253 145 160 145

100
20

40
40
110
25

Model A B

3P 685 625
285
φ1 4

4P 855 790

A
175
15
116.5
15
484
420

*560

116.5
15
103

*50
B
4
φ1
4-

“*”Safety distance

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XSTN 2000A 10
AUTOMATIC TRANSFER SWITCHES

Dimension

253 145 160 145

100

20
40

40
110
25

Model A B

285
φ14

3P 685 625

4P 855 790

A
175

20
114
20
484
420

*560

114
20
98
*50
B
4
φ1

“*” Safety distance

4-

XSTN 2500A

270 220 220 190

130 100
25

50 40
20
50
120

105
40
φ1 4

1070 300
180 48
480 480
30
30
20
110
560
520

*560

30
110
30

*50

650 “*” Safety distance

4
φ1
4-

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 AUTOMATIC TRANSFER SWITCHES
Installation Precautions
1. Altitude below 2000m
2. Ambient temperature: -25°C ~ +60°C, cannot exceed average of 35°C in 24 hours.
3. Atmospheric conditions: Relative humidity could not exceed 50% when the surrounding temperature is +55°C.
For lower temperature, the relative humidity can be higher.
4. Pollution Degree: 3
5. Installation category: III
6. Installation conditions: Vertical or horizontal install in panel.

Maintenance, checking and storing

1. Before maintenance and checking, the power must be cut-off and only be done by professional personnel.
2. To ensure the breaker is at good condition, the first maintenance and checking should be done within half
year after installation and must be done once a year after it. In harsh installation environment, the frequency
of maintenance and checking should increase.
3. Breaker should be installed in environment listed above and should have dustproof, waterproof and
anti-bump measures.
4. Maintenance checking items include:
a. Cleaning dust and dirt in time to avoid product malfunction.
b. Check the electrical contact parts for deformation, clean the metal particles and burning marks on contact
surface and surrounding.
c. Rust, acidification and dust on contact surface may cause poor conduction, please manual operating several
times, measure contact resistance if needed.
d. If the breaker is slightly damp or not being use for a long time, it must be dry before use. After cleaning the
dust and dirt, use a 500V mega-ohm meter to measure between terminals, electrical contact parts and floor,
the insulation resistance should be > 10MΩ in order to be use.
5. Other checking method is listed in table 1.

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AUTOMATIC TRANSFER SWITCHES

Maintenance, checking and storing

Table 1: Checking and trouble shooting

Checking items Check point Trouble shooting

1. Cut-off all power and check with a multimeter.

1. Whether the main circuit connecting wires
2. The silver plating layer on the contact surface is discolored
have obvious discoloration.
Visual inspection due to oxidation, but does not affect performance .
2. Whether there is dust or metal particles on
3. Clean the dust or metal particles on contact surface and
contact surface and surrounding.
surrounding.

If the mechanism is being stuck, put 2 to 3 drops of ISO No.8

Manual operation Manually operate the handle 3 to 5 times to make oil or few drops of No. 3 white lithium base oil on places such
checking sure the mechanism is flexible and smooth. as operation axis, sliding bar and other moving parts, then try
another 3 to 5 times.

Frequently electric operation failure reason:

1. Internal coil being burned.
Following the operation procedure of secondary 2. Insufficient battery capacity when using DC operation.
Electric operation wiring circuit or controller, repeat 3 electrical 3. Wiring length for secondary wiring circuit is too long or wire
checking operations and see if the product is working cross section to small, causing circuit voltage to drop.
normally. 4. Loose wiring of internal control switch or switching failure.
5. Loose wiring of secondary wiring circuit, relay contact failure
or controller failure.

Frequently temperature rise reason:

If there are any abnormal temperature rising,
1. Looseness of wiring screw.
Temperature rise locate the position.
2. Contact wear or burned, resulting in reduced contact pressure.
checking Cut off all the power and use a multimeter to
3. Dirt on the surface of the contact.
check and compare.
4. Looseness of contact movement mechanism.

If the trouble shooting listed above does not work, please contact our company.

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SHIHLIN ELECTRIC
& ENGINEERING
MOTOR CONTROL (CONTACTOR/ MS/ MMS), CIRCUIT
BREAKER (MCCB/ ELCB/ EMCCB/ MCB), AIR CIRCUIT
BREAKER, AUTOMATIC TRANSFER SWITCHES (Panel
Board Type/ Residential Unit Use), SURGE PROTECTIVE
DEVICE, LOW VOLTAGE POWER CAPACITORS, SMART
METER, INVERTER

Breaker & switchgears overseas sales dept.

3F, No.9, Sec. 1, Chang-an E. Rd., Zhongshan Dist., Taipei City 10441, Taiwan
T. +886-2-2541-9822 F. +886-2-2581-2665
e-mail. b.export@seec.com.tw
http://circuit-breaker.seec.com.tw

Headquarters
16F, No.88, Sec. 6, Zhongshan N. Rd., Shilin Dist., Taipei City 11155, Taiwan
T. +886-2-2834-2662 F. +886-2-2836-6187 Distributor
http://www.seec.com.tw
B200601E.ATS-PC-OB