Moulded case
circuit breakers
CONTENT
Range
4
Protection Releases
5
Salient Features
8
Accessories
10, 14
Technical data
12
Time Current Characteristics
15
Overall Dimensions
17
SN4
SN3
SN2
SN1
3
MOULDED CASE CIRCUIT BReAKERS
RANGE
Moulded case circuit breakers Iskra are assurance for your electrical installations and equipment.
They are designed to reliably protect all installation system against overloads and short-circuits.
You can choice:
- Range from 16 A to 1600 A
- 3-pole or 4-pole versions
- 30 kA/36 kA/50 kA/70 kA breaking capacities
- protection with thermal-magnetic and electronic release
- wide range of internal and external accessories
- KEMA and CB approved
SN1
Rated Current
20, 25, 32, 40, 50, 63, 80, 100 A
Release
Thermal-Magnetic
SN2
Rated Current
63, 80, 100, 125, 160, 200, 250 A
40, 63, 100, 160, 250 A
Release
Thermal-Magnetic
Electronic
SN3
Rated Current
320, 400, 500, 630 A
63, 160, 250, 400, 630 A
Release
Thermal-Magnetic
Electronic
SN4
Rated Current
800, 1000, 1250, 1600 A
Release
Electronic
BREAKING CAPACITIES
4
MOULDED CASE CIRCUIT BReAKERS
PROTECTION RELEASES
Thermal-Magnetic Release
Features of Thermal-Magnetic Release
Adjustable protection overload settings
Adjustable protection short-circuit settings
True RMS sensing
No contact with live parts
Protection
Settings
Overload
Short circuit
Earth fault
SN1
SN2&SN3
80 % - 100 % In 80 % - 100 % In
9 In (fixed)
6 - 10 In
external
Electronic Release
Features of RC10 Electronic Release
Overload protection with inverse time delay
Short circuit protection with selectable time delay
Earth fault protection with selectable time delay
Neutral protection with selectable time delay
Push to trip button
Port for release testing
Power ON LED
Self powered protections
Protection mode can be ON / OFF
True RMS sensing
Instantaneous over ride protection
RC10
In (A)
From 40 to 1600 A
Overload (Phase)
Current setting , Ir (Ir = xIn)
0,4 to 1,0 in steps of 0,1
Time delay, tr (Inverse)
Protection mode
10 s at 6 Ir
On / Off
Overload (Neutral)
0,5, 0,75 and 1,0 Intrl
Inverse 10 s at 6 Intrl / Fixed 200 ms
On / Off
Current setting, In (Intrl = xIr)
Protection mode
Short Circuit
Current setting, Is (Is = xIr)
Time delay, ts
Protection mode
1, 5, 4, 6 & 8 Ir
10 / 100 ms
On / Off
Instantaneous Over ride
12 In for SN3-400
8 In for SN2-250, SN3-600 and SN4-1250/1600
Current setting, Ip
Earth Fault
Current setting, Ig
Time delay, tg
Protection mode
0,2 to 0,5 In steps of 0,1
100 / 200 ms
On / Off
5
MOULDED CASE CIRCUIT BReAKERS
PROTECTION RELEASE
Electronic Release
Features of RC20 - Communication Capable
• Power on LED
• Backlit LCD display
• Scroll buttons
• Push to trip button
• All features of RC10 release are incorporated
• Metering for current parameters
• Protection against unbalanced load / single phasing
• I ² t protection
• Neutral protection
• Cold load protection
• User friendly navigation system
• Selfpowered
RC20
Rated Current In A
For 400 A & 630 A
Overload (Phase)
Current setting (A), Ir (Ir = xIn)
0,4 to 1,0 in steps of 0,1
Time delay, tr (s) (Inverse)
3, 6, 10, 15, 30 at 6 Ir
Protection mode
On / Off
Preset trip alarm setting
0,8 to 1,0 Ir in steps of 0,05
Thermal memory
On / Off
Overload (Neutral)
Current setting (A), Ir
50 %, 75 %, 100 % In
Time delay tn (s) at 6 Ir
As per overload
Protection mode
On / Off
Preset trip alarm setting
Intrl 0,8 to 1,0 Ir in steps of 0,05
Short Circuit
Current setting (A), Is
Time delay ts (ms)
1,5 to 8 Ir in steps of 0,1Ir
For - I ² t OFF 20 to 200 in steps of 20
For - I ² t ON 60 to 200 in steps of 20
Protection mode
On / Off
Preset trip alarm setting
0,8 to 1,0 times Is in steps of 0,05 Is
Cold load pickup
Enable / Disable
Instantaneous
Instantaneous
1,5 to 8 In in steps of 0,5 In
Protection mode
On / Off
Cold load pickup
Enable / Disable
Instantaneous Over ride
Current setting (A), Ip
12 In for SN3-400
8 In for SN3-630
Earth Fault
6
Current setting (A), Ig
0,2 to 0,5 In steps of 0,1 In
Time delay (ms), tg
0,1, 0,2, 0,5, 1, 3 s
Preset trip alarm setting
0,8 to 1,0 Ig in steps of 0,05
Protection mode
On / Off
Cold load pickup
Enable / Disable
MOULDED CASE CIRCUIT BReAKERS
Protection Release
Additional Features of RC20
Current unbalance
Current setting (A) xIn
10 % to 100 % In in steps of 5 %
Time delay (s)
1 to 10 in steps of 0,5
Protection mode
On / Off
Cold load pickup
Enable / Disable
Temperature rise
Alarm / Trip
At 80 ºC / At 100 ºC
Metering
Current
Phase, Neutral and Earth
Display
Backlit LCD
7
MOULDED CASE CIRCUIT BReAKERS
SALIENT FEATURES
Faster Tripping:
The unique speed contact system accelerates the
opening of contacts during short circuit. This ensures
faster tripping an ultimate current limiting feature.
The result-very low let-through, cut-off current and fault
clearing time.
Mechanical Anti-reclosing:
This unique feature ensures that under short circuit conditions,
the contacts open and latch even before the release gives a trip
command to the mechanism. This avoids contact re-closing
and bounce.
Low watt loss:
The entire current carrying path is optimally designed to achieve
very low watt loss.
Positive Isolation:
The MCCB knob indicates the true position of the contacts.
Double Insulation:
The internal accessories are housed in insulated casings to ensure
first level of insulation. When the front cover is opened for the fixing
of internal accessories, the MCCB is totally insulated ensuring the
double insulation.
Marking:
Marking ensures use of superior engineering plastic, meeting all
requirements of flammability and glow wire test.
8
MOULDED CASE CIRCUIT BReAKERS
SALIENT FEATURES
Common Internal accessories:
The internal accessories remain same across
SN2 / SN3 / SN4 range* and they are easy
to install click fit type.
*Except under-voltage release
No side bias:
Internal accessories can be mounted on the either side.
LINE
No load line bias:
Either side of MCCB terminal can be used as load or line .
LOAD
Terminal finger proofing:
Front terminal plates conceal the terminals to prevent human
contact thus achieving complete finger proofing.
Terminal shrouding:
Terminal shrouds cover spreader terminals preventing human
contact with terminals (TS available for SN1).
Release shrouding:
Release is shrouded from the front thus preventing tampering
by unauthorized person.
Safer release adjustments:
No live parts are in contact during release adjustments.
Common front adjustments for Protection release:
Overload & short circuit setting can be adjusted from front
using a common knob for all the poles.
Visibility:
Push to trip button and release ratings are visible even when
release plate is fitted.
9
MOULDED CASE CIRCUIT BReAKERS
Accessories
Internal Accessories
Range of MCCBs are offered with click-fit type, easily installable internal accessories.
There is no need to open main cover and no live parts are accessed during
installation. Any accessory can be fitted on any side enhancing flexibility
(except under-voltage release).
Auxiliary Switch
List of Internal Accessories
Auxiliary Switch 2 change-over (AUX2-SN1, AUX2-SN2/3/4)
Trip Indicator 1 change-over (TA1-SN2/3/4) & 2 change-over
(TA2-SN1)
Auxiliary Switch & Trip Indicator 1 + 1 change-over
(AUXTA-SN1, AUXTA-SN2/3/4)
Shunt Release (A-SN1, A-SN2/3/4)
Under Voltage Release (U-SN1, U-SN2, U-SN3, U-SN4)
MCCB with mid cover opene &
Internal accessories fitted.
External Accessories
Rotary Operating Mechanism
The rotary operating mechanism (ROM) for MCCBs are available in Direct & Extended versions.
Direct rotary handle ( MCCB mounted: ROM-SN1,
ROM-SN2, ROM-SN3).
These versions are available for the entire family of
MCCBs. These ROMs can be supplied with key lock for SN2
and SN3 frames
Extended rotary handle ( Panel mounted: ROM OS-SN1,
ROM OS-SN2, ROM OS-SN3, ROM OS-SN4)
10
ROM mounts directly on MCCB without removal of midcover
Door interlock in OFF condition with padlock feature
Clear ON/OFF/TRIP indication
Clear view of MCCB rating label with ROM mounted
Direct access to push to trip button with ROM mounted
IP 54 degree of protection with extended rotary handle
Keylock version available
Door interlock in ON position, with defeat facility
Auto restoration of door interlock
MOULDED CASE CIRCUIT BReAKERS
Accessories
Electrical Operating Mechanism
Features
Clear ON/OFF/TRIP indication
Safety interlock: EOM will not operate if
- EOM cover is open
- EOM is not properly fixed on MCCB
Permits manual operation, if required
Padlock facility for locking in OFF position
Easy access to the protection setting on the MCCBs
Electrical Operating Mechanism (EOM)
Applications
Facilitates remote operation of MCCBs
Facilitates use in process automation applications and auto change over schemes
Technical Specifications
EOM-SN2
Type Designation
EOM-SN3
Operating Voltage
24, 48 VDC, 240 VAC *
Operating Time
SN2 <2,2 s, SN3 <3,3 s
*240 VAC available on request
Specifications
SN2
SN3
24 VDC - 48 VDC
24 VDC - 48 VDC
Current ar rated load (A)
1,32
0,66
2,2
1,1
Input VA (W)
32
32
53
53
Full load speed (rpm)
4800
4800
5000
5000
Full load torque (gm-cm)
432
432
720
720
11
MOULDED CASE CIRCUIT BReAKERS
Type
SN1 - 100
SN2 - 250
No. of Poles
3
3/4
Rated Current
In
A
20, 25, 32, 40, 50, 63, 80, 100
Standards
Approvals
KEMA, CB
Rated Operational Voltage
Ue
KEMA & CB only for MCCB’s with RC10
V
600
690
Ui
V
690
750
Uimp
kV
6
8
Rated Frequency
Hz
50 / 60
Ambient temperature
°C
Storage temperature
°C
Reference Ambient Temperature
°C
Rated Insulation Voltage
Rated Impulse withstand Voltage
50 / 60
-5 °C to +55 °C
-35 °C to +70 °C
Utilisation Category
Versions
40
40
A
A
Standard
Standard
SN2- 250S
High
SN2- 250H
Extra
High
SN2- 250L
Rated Ultimate S.C.
230/240 V
65
65
85
100
Breaking Capacity
400/415 V
36/30
36
50
70
500 V
16
25
36
50
550 V
12
18
25
36
Icu
600 V
8
16
18
22
-
10
15
20
250 V DC (3 poles in series)
15
15
25
36
500 V DC (3 poles in series)
5
5
10
20
kA
690 V
L/R <15 ms
Rated Service S.C. Breaking Capacity
Endurance
Ics
kA
50 % Icu
100 % Icu
30000
25000
4000
10000
10
18
2
Mechanical
Electrical (1,0 In)
Power dissipation per pole
W
Standard
cable (lug)
link
mm
mm2
35 (width <17 mm)
(width <17 mm)
95
25 x 5
With Spreader Links
cable (lug)
link
mm2
mm2
50 (width <22 mm)
(width <22 mm)
185
35 x 6
Box Clamp
Cu. Cable
mm2
35
120
mm
75 x 60 x 130
105 / 140 x 96 x 179
Terminal Capacity
Dimensions (W x D x H) 3 / 4 Poles
Weight
12
40, 63, 80, 100, 125, 160, 200, 250
IEC/EN 60947-2
3 / 4 Poles
A
C
C
E
S
S
O
R
I
E
S
Internal
1
2,5 / 3,3
Auxiliary Switch
kg
1 or 2 change-over
1 or 2 change-over
Trip Indicator
1 or 2 change-over
1 change-over
Auxiliary Switch & Trip Indicator
1 + 1 change-over
1 + 1 change-over
Shunt Release
240 - 415 V AC 50 / 60 Hz
110 - 415 V AC 50 / 60 Hz, 110 - 220 V DC
Under-voltage Release
240 V AC 50 Hz
220 - 240 V AC 50 / 60 Hz
Rotary Operating Mechanism


Electrical Operating Mechanism
X

Earth Fault Release


Machanical Interlock
X

Terminal Shrouds

X
Spreader Links


Box Clamp


Pad lock *

X
External
*One time fitting, non-detachable type
MOULDED CASE CIRCUIT BReAKERS
SN3 - 400/630
SN4 - 1250
SN4 - 1250/1600
3/4
3/4
3/4
800, 1000
1250, 1600
320, 400, 500, 630
IEC/EN 60947-2
KEMA, CB
KEMA & CB only for MCCB’s with RC10
KEMA & CB only for 1250 A
690
690
690
750
750
750
8
8
8
50 / 60
50 / 60
50 / 60
-5 °C to +55 °C
-35 °C to +70 °C
40
40
A
40
A
Standard
SN3 400S, 630S
High
SN3 400H, 630H
Extra High
SN3 400L, 630L
Standard
SN4 - 1250S
65
85
100
36
50
25
36
15
12
8
A
High
SN4 - 1250H
Standard
SN4 1250S, 1600S
High
SN4 - 1250H
85
100
85
100
70
50
70
50
70
50
25
36
25
36
20
25
20
25
20
25
18
22
16
20
16
20
15 / 10
20 / 15
10
18
10
18
15
25
36
-
-
-
-
5
10
20 / 16
-
-
-
-
100 % Icu
100 % Icu
100 % Icu
15000
8000
8000
4000 / 2000
750
750
22 / 47
32 / 50
78 / -
120
27 x 15
185
2 x 40 x 15
185
2 x 40 x 15
2 x 185
2 x 40 x 8
2 x 30
2 x 60 x 15
2 x 30
2 x 60 x 15
240
—
—
140 / 183,5 x 111,5 x 266
280 x 370 x 179
280 x 370 x 179
6 / 7,8
17 / 21
17 / 21
1 or 2 change-over
1 or 2 change-over
1 or 2 change-over
1 change-over
1 change-over
1 change-over
1 + 1 change-over
1 + 1 change-over
1 + 1 change-over
110 - 415 V AC 50 / 60 Hz, 110 - 220 V DC
110 - 415 V AC 50 / 60 Hz, 110 - 220 V DC
110 - 415 V AC 50 / 60 Hz, 110 - 220 V DC
220 - 240 V AC 50 / 60 Hz
220 - 240 V AC 50 / 60 Hz
220 - 240 V AC 50 / 60 Hz




X
X
Inbuilt protection with Electronic release
Inbuilt protection with Electronic release
Inbuilt protection with Electronic release

X
X
X
X
X




X
X
X
X
X
13
MOULDED CASE CIRCUIT BReAKERS
Accessories
Mechanical Interlock Schemes (M INT)
Mechanical Interlock kit
Features
For 3-pole & 4-pole versions
Suitable for SN2 & SN3 frames
M INT with base plate
Earth fault release (EFR)
Earth fault currents:
- up to 200 A
- from 250 A to 400 A
- from 630 to 800 A
Ordering data for MCCB
Example: SN2-250S3 63A 36kA 10In
SN2-250 - Type
S - Version
3 - No. of poles
63A - Rated current
36kA - Breaking capacity
10In - Kind of release (10In, RC10 and RC20)
14
MOULDED CASE CIRCUIT BReAKERS
Time - Current Characteristic Curves
Thermal-Magnetic Release
SN1 - 100
SN2 - 250
10000
10000
1000
1000
Time in Seconds
100
10
10
1
1
0.1
0.1
0.01
1
2
4
6
8
0.01
10
20
1
2
4
Multiples of Current
6
8
10
2
4
6
8
100
2
Multiples of Current
SN3 - 400/630
10000
1000
100
Time in Seconds
Time in Seconds
100
10
1
0.1
0.01
1
2
4
6
8
10
2
Multiples of Current
4 6 8
100
2
15
MOULDED CASE CIRCUIT BReAKERS
Time - Current Characteristic Curves
Microprocessor Release
RC10
SN2-250, SN3-630 and SN4-1250/1600
SN3-400
1000
1000
100
100
10
10
Time in Seconds
10000
Time in Seconds
10000
1
100% In
1
40% In
0.1
100% In
0.1
0.01
0.01
2
4
6
8
4
2
2
6
8
4
2
10
Multiples of Current (Ir)
Multiples of Current (Ir)
SN3-630
RC20
SN3-400
10000
10000
10000
30 sec
15 sec
10 sec
6 sec
3 sec
1000
100
100100
10
10 10
1
100%
100%InIn
30 sec
15 sec
10 sec
6 sec
3 sec
1000
1000
Time in Seconds
Time in Seconds
Time in Seconds
4
10
1
1 1
100% In
100% In
40%
40%InIn
0.10.1
0.1
40% In
40% In
0.01
0.01
0.01
22
16
40% In
11
44
66 88
1010
Multiples
of Current
Multiples
of Current
(Ir) (Ir)
22
22
44
11
44
66 88
10
10
Multiples
of Current
(Ir) (Ir)
Multiples
of Current
22
44
MOULDED CASE CIRCUIT BReAKERS
Overall Dimensions
SN1 - 100
CABLE TERMINAL SCREW: M6
25
61.5
58
45
20
38
25
62.5
12.5
116
112
130
28.5
25
60
75
85
SUITABLE FOR 35 x 7.5
TOP HAT RAIL MOUNTING
25
MCCB MOUNTING SCREW : M3-2Nos.
46.5
25.5
61
30
46
39
112
2.5
76
Mounting & Door Cutout Details
SN1 with Spreader Links
92
86.1
35
35
60
2
20
11
30.2
130
172.2
194.2
20
22
Note:
Spreaders Optional
All dimensions are in mm.
17
MOULDED CASE CIRCUIT BReAKERS
Overall Dimensions
SN2 - 250
119
96
35
35
8
27.5
157
61
46
TRIP
45
163
ON
179
72.7
17.5 17.5
OFF
42
35
35
35
25.5
17.5
42
86
105
Mounting & Door
Cut-out Details
140
Terminal width = 25.5 mm
SN2 - 250 4P
with Spreader Links
SN2 - 250 3P
with Spreader Links
170
125
45
35
4
27.5
45
4
35
ON
OFF
275
TRIP
239
ON
275
38
239
45
38
18
45
27.5
18
45
TRIP
OFF
4
25.5
18
4
25.5
All dimensions are in mm.
MOULDED CASE CIRCUIT BReAKERS
Overall Dimensions
SN3 - 400/630
142
111.5
121
78
224
77
TRIP
266
234
ON
82.7
104.2
16
A
OFF
43.5
43.5 26.5
B
43.5
43.5
140
183.5
SN3 - 400/630 3P
with Spreader Links
Type
SN3-400
SN3-630
A
39
41
B
37
38
C
45
55
D
324
344
E
370
390
F
13
11
SN3 - 400/630 4P
with Spreader Links
142
142
209.5
154
43
43
6
6
B
6
61
25
55.5
55.5
ON
TRIP
OFF
B
6
55.5
266
ON
TRIP
OFF
406
356
266
61
406
356
A
25
A
55.5
All dimensions are in mm.
55.5
19
MOULDED CASE CIRCUIT BReAKERS
Overall Dimensions
SN4 - 1250/1600 MCCB
SN4 - 1250/1600 with Spreader Links
20
*A = 6 mm for SN4 800 A and 20 mm for SN4 1000/1250/1600 A
All dimensions are in mm.
MOULDED CASE CIRCUIT BReAKERS
Rom Door CUT-out details
Direct ROM door cut-out detail
L5
L4
17
L3
N
L2
L1
L1 = Mounting depth
L2/L3 = Panel cut-out
L4/L5 = Breaker mounting refer
Type
L1
L2
L3
L4
L5
SN1
96,5
58
52
44
37
SN2
122
96
63
53
66
SN3
156
121
87
78
82
Extended ROM door cut-out detail
REFER PANEL CUT DETAILS
L2
I 50
L3
45
N
I 76
I4
L1
L
L = 275 mm
L1 = minimum panel depth
L2 = cut the shaft to the required length
All dimensions are in mm.
Type
L1
L2
L3
L4
L5 *
SN1
160
L1-119
7,5
69,5
394
SN2
202
L1-152
27
84
427
SN3
233
L1-183
39
122
458
SN4
302
L1-252
69
170
527
* Max. depth
21
MOULDED CASE CIRCUIT BReAKERS
Overall Dimensions
Overall Dimensions with EOM
C
B
A
ON
T R IP
OF F
Type
A
B
C
For SN2 EOM
205
18
112,3
For SN3 EOM
226
46,5
147,3
DN2 M INT Kit
22
Dimensions in mm
DN3 M INT Kit
Iskra MIS , d. d.
Ljubljanska c. 24a
SI- 4000 Kranj, Slovenia
Phone:
+386 (0) 4 23 72 112
Fax:
+386 (0) 4 23 72 109
www.iskra-mis.si
Published by: Iskra MIS, d. d., Version 1.1, Kranj, December 2009 • Design: Nimbus d.o.o.