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· . . . - : : ~ . .
.----------.-~
L&T SWITCHGEAR
. . . . .
Motor Protection Circuit BreakersMNX Series
9ARSEN & roUBRO
It's all about Imagineering
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2
T y p i c a l M o t o r f e e d e r
SCPO
RELAY
Switching
Device
Motor
A typical motor feeder consists of 3 components
• SCPO: Short Circuit Protection Device provides protection to motor
against high over currents including short circuit. It also provides
isolation in open condition.
• Relay: It provides close protection to the motor against overloads and
single phasing.
• Switching Device : It is used to switching ON and OFF the motor
under normal condition. A common example of a switching device is a
contactor. In addition the relay output gives trip command to the
switching device to switch off the motor.
M P C B s l o r M o to r B a c k - u p P r o t e c t i o A
MPCBs are increasingly being used in motor protection application due
to the following advantages.
• Fuseless protection system with low down time
• Integrated comprehensive protection
• Lower let through energy
• Compact
• Availability of various accessories
• High Electrical li fe
• High Breaking Capacity
• Ease of Co-ordination
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L&T SWITCHGEAR
S e l e c t i o n 0 1 M P C B S c h e m e
There are three possible combination of using MPCBs for motor backup
protection aimed at offering optimum benefit to the user.
The schemes are as illustrated below:
MPCB
Motor
MPCB
Contactor
Motor
6
MPCB
RELAY
Contactor
Motor
M P C B S c h e m e 1This scheme is recommended when switching of motor is infrequent.
MPCBProvides• Protection against short circuit
• Protection against overload and single phasing
• Switching of motor
M P C B S c h e m e 2This scheme is recommended for applications involving frequent
switching of motor.
MPCBProvides• Protection against short circuit
• Protection against overload and single phasing
Contactor is used for• Switching motor under normal condition
M P C B S c h e m e 3This scheme isrecommended only inspecial cases like
• Very close overload protection is required
• Selectable manual/auto resetfeature is required
• Classic method of motor protection scheme is desired.
MPCBProvides• Protection against short circuit
Relay Provides• Close protection to motor against overload and single phasing
Contactor• To switch the motor under normal condition
• To switch off the motor on tr ip command from relay output
3
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4
M N X S e r i e s 0 1 M P C B
S a l i e n t F e a t u r e s :• Wide range from 0.16A to 63Ain just 3 frame sizes.
• High Breaking Capacity of atleast 50kA for the entire
range.
• Comprehensive OIL & SIC protection with phase
failure sensitivity.
• All MPCB have DIN rail mounting facil ity.
• Sturdy Door Coupling Rotary Handle with pad lock
and Door Interlock facility.
Differential trip indication facility for Trip Alarmcontact.
• Wide range of Accessories for control and indication.
Accessories common across the range.
R a n g e
MPCB with accessories fitted
PUSH BUTTON TYPE:
• MNX G O : MPCB with adjustable over load setting and
fixed short circuit setting available from 0.16 A to 16A
covered in 11 catalogue numbers. It trips on both
Overload and Short circuit. Short circuit release is fixed
at14timeslu.
ROTARY KNOB TYPE:
• MNX G1 : MPCB with adjustable over load setting and
fixed short circuit setting available from 0.16 A to 32 A
covered in 14 catalogue numbers. It trips on both
Overload and Short circuit. Short circuit release is fixed
at14timeslu.
• MNX G3 : MPCB with adjustable over load setting &fixed short circuit setting available from 16 A to 63 A
covered in 7 catalogue numbers. It trips on both
Overload and Short circuit. Short circuit release is fixed
at14timeslu.
• MNX G2 : MPCB with fixed short circuit protection and
without overload protection. For applications where
separate overload relays are preferred (MPCB Scheme
3) MNXG2 makes an ideal short circuit protection
device. It is available upto 32A and can be used in
application with or without manual reset. Short circuitrelease isf ixed at 14 times lu.
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M P C B A c c e s s o r i e s
L&T SWITCHGEAR
-
To Indicate whether
MPCB condition is
"ON or "OFF".
Trip condition same as
"OFF" condition
To Indicate whetherMPCB condition is
"ON or "OFF".
Trip condition same as
"OFF" condition
To Indicate whether
MPCB has tripped on
OIL or SIC and thus
furnishes clear
differential trip indication
For remote operation,
Applying 230V AC
voltage to shunt release,
tr ips the MPCB
Removing voltage to
under voltage release,
trips the MPCB.Thus, can be used as
Emergency Stop device
Sturdy operating
handle with padlocking
facility. Three distinct
positions are available
"ON", "OFF" & "TRIP"
ST344340000M
ST344360000M
ST344420000M
ST344440NOOM
ST34445KOOOM
ST344390000M
5
Standard Auxiliary
contacts - 1NO + 1NC
(front mounting)
Standard Auxiliarycontacts - 1NO + 1NC
(Side mounting)
To be fitted on
right hand side
Trip-indicating aux.
contacts, separate
indicator, 2NO to be
fitted on right hand side
Shunt release
(230V AC 50Hz)
To be fitted on
left hand side
Under voltage release
(230V AC 50Hz)
To be fitted onleft hand side
Door coupling handle*
including extension
shaft.
*Note : Not applicable for MNX GO
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T e c h n i c a l D a t a · M P C B
Specification
General
Standards IS 13947, IEC / EN 60947
Direction of incoming Supply As required
Degree of protection
Device IP20 IP20 IP20
Terminals IPOO IPOO IPOO
Protection against direct contact Finger and back-of-hand proof
Terminal Capacity
Solid mm " 1 x (1-6) 1 x (1-6) 1 x (1-50)
mm2 2 x (1-6) 2 x (1-6) 2 x (1-35)
Flexible mm2 1 x (1-6) 1 x (1-6) 1 x (1-35)
mm " 2 x (1-6) 2x(1-6) 2 x (1-35)
Terminal Screw Tightening Torque
Main Cable Nm 1.7 1.7 3
Control circuit cable Nm 1 1 1
Main Contacts
Rated Impulse withstand Voltage Uimp VAC 6000 6000 6000
Over voltage Category/Pollution Degree 111/3 111/3 111/3
Rated Operational Voltage Ue VAC 690 690 690
Rated Operational Current IU = Ie A Refer selection Table
Rated Frequency Hz 40-60 40-60 40-60
Life Span Mechanical Operations X106 0.05 0.1 0.03
Life Span Electrical (AC-3 400V) Operations X106 0.05 0.1 0.03
Maximum Operating frequency Operations/h 25 40 40
Releases
Overload release setting Range* Xlu 0.6-1 0.6-1 0.6-1
Fixed Short Circuit release Xlu 14 14 14
Phase failure sensitivity As per IEC / EN 60947-1-1
* Not applicable for MNX G2
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L&T SWITCHGEAR
-
T e c h n i c a l D a t a · A c c e s s o r i e s
f.!.lTi111f-:JJ,'AI'!.lllf':rt1!"1
Rated Operational Voltage Ue VAC 440
Life span electrical Operations X106 >0.1
Rated Operational Current AC-15, 240 VAC Ie A 1
Terminal Capacity mm2 0.75-1.5
u rn •. J.' . I i . , i " T I J 1 7 · :n::r;
Rated Operational Voltage Ue VAC 42-480
Pick-up Voltage XUs 0.85-1.1
Drop-out Voltage XUs 0.7-0.35
Cross-sections
Solid or flexible mm
2 1 x (0.75-2.5)
mm2 2 x (0.75-2.5)
Power consumption
Picking up AC VA 5
SealingAC VA 3
( , " 1mmrn rnn
Rated Operational Voltage Ue VAC 42-480
Power consumption
Picking up AC VA 5
SealingAC VA 3
Cross-sections
Solid or flexible mm2 1 x (0.75-2.5)
mm2 2 x (0.75-2.5)
Operating range (AC) XUs 0.7-1.1
S e l e c t i o n T a b l e
R a t e d U n i te r ru p t e dC u r r e n t
S e tt in g R a n g e B re a kin g ca p a c ity a t 4 0 0 V A C O rd e rin g d e ta ils
. '1 ! m r l ! II C . ~ i ~ l o r r r . m J I I l lI C I
0.16 0.1 - 0.16 2.2 50 50 ST36246 OOBOM
0.06 0.25 0.16 - 0.25 3.5 50 50 ST36247 OODOM
0.09 0.4 0.25 - 0.4 5.6 50 50 ST36248 OOFOM
0.12 0.63 0.4 - 0.63 8.8 50 50 ST36249 OOHOM
0.25 0.63 - 1 14 50 50 ST36250 OOKOM
0.55 1.6 1 - 1.6 22 50 50 ST36251 OOMOM
0.75 2.5 1.6 - 2.5 35 50 50 ST36252 OOPOM
1.5 4 2.5 - 4 56 50 50 ST36253 OOROM
2.2 6.3 4 - 6.3 88 50 50 ST36254 OOTOM
4 10 6.3 - 10 140 50 50 ST36255 OOVOM
7.5 16 10 - 16 224 50 50 ST36257 OOBOM
*Note : Door coupling Rotary Handle not applicable for MNX GO
7
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R a t e d U n i te r ru p t e dC u r r e n t
S e tt in g R a n ge B re a k in g ca p a c ity a t 4 0 0 V A C O rd e rin g d e ta ils
lu(A)
0.16 0.1 - 0.16 2.2 150 150 ST34413 OOBOM
0.06 0.25 0.16 - 0.25 3.5 150 150 ST34413 OODOM
0.09 0.4 0.25 - 0.4 5.6 150 150 ST34413 OOFOM
0.12 0.63 0.4 - 0.63 8.8 150 150 ST34414 OOHOM
0.25 0.63 - 1 14 150 150 ST34415 OOKOM
0.55 1.6 1 - 1.6 22 150 150 ST34416 OOMOM
0.75 2.5 1.6 - 2.5 35 150 150 ST34416 OOPOM
1.5 4 2.5 -4 56 150 150 ST34416 OOROM
2.2 6.3 4 -6.3 88 150 150 ST34416 OOTOM
4 10 6.3 - 10 140 150 150 ST34417 OOVOM
7.5 16 10 - 16 224 50 50 ST34418 OOBOM
9 20 16 - 20 280 50 50 ST34419 OOCOM
12.5 25 20 -25 350 50 50 ST34420 OODOM
15 32 25 -32 448 50 50 ST34420 OOEOM
R a t e d U n i te r ru p t e dC u r r e n t
S e tt in g R a n ge B re a k in g ca p a c ity a t 4 0 0 V A C O rd e rin g d e ta ils
lu(A) . · !Dmll ! lC .~1=l l !mI l1 lmCI
10 - 16 224 150 ST34421 OOBOM
16 - 25 350 150 150 ST34421 OODOM
24 -32 448 50 50 ST34422 OOEOM
32 -40 560 50 50 ST34422 OOFOM
40 -50 700 50 50 ST34422 OOGOM
50 -58 812 50 50 ST34423 OOSOM
55 -63 882 50 50 ST34423 OOHOM
12.5
15
20
25
30
34
16
25
32
40
50
58
63
MNX G2, MPCB with rotary knob control having short circuit protection only
R a t e d U n i te r ru p t e dC u r r e n t
S e tt in g R a n ge B re a k in g ca p a c ity a t 4 0 0 V A C O rd e rin g d e ta ils
_mlZJ-.Ifl'I··1TIhf-2.2
4
7.5
15.0
6.3
10
16
32
88
140
224
448
150
150
50
50
150
150
50
50
ST34424 OOTOM
ST34425 OOVOM
ST34425 OOBOM
ST34425 OOEOM
NANANANA
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T y p e 1 2 1 C o - o r d i n a t i o n S e l e c t i o n C h a r t
L&T SWITCHGEAR
Fuseless Protection for DOL Starter Feeders with MPCB - Push Button Type
Iq=50 kAat415V, 30, 50 Hz.
MPCB
MNX-GO 0.4 - 0.63
MNX-GO 0.63 - 1
MNX-GO 0.63 - 1
MNX-GO 1 - 1.6
MNX-GO 1 - 1.6
MNX-GO 1.6 - 2.5
MNX-GO 2.5 -4
MNX-GO 2.5 -4
MNX-GO 2.5 -4
MNX-GO 4 -6.3
MNX-GO 4 -6.3
MNX-GO 6.3 - 10
MNX-GO 6.3 - 10
MNX-GO 6.3 - 10
MNX-GO 10 - 16
MNX-GO 10 - 16
Fuseless Protection for DOL Starter Feeders with MPCB - Rotary Type
Iq=50 kAat415V,30,
50 Hz.MPCB
-_..MNX 9 MNX-G1 0.25 - 0.4
MNX 9 MNX-G1 0.4 - 0.63
MNX 9 MNX-G1 0.4 - 0.63
MNX 9 MNX-G1 0.63 - 1
MNX 9 MNX-G1 0.63 - 1
MNX 9 MNX-G1 1 - 1.6
MNX 9 MNX-G1 1 - 1.6
MNX 9 MNX-G1 1.6 - 2.5
MNX 12 MNX-G1 2.5 -4
MNX 12 MNX-G1 2.5 -4
MNX 12 MNX-G1 2.5 -4
MNX 12 MNX-G1 4 -6.3
MNX 12 MNX-G1 4 -6.3
MNX 12 MNX-G1 6.3 - 10
MNX 12 MNX-G1 6.3 - 10
MNX 12 MNX-G1 6.3 - 10
MNX 12 MNX-G1 10 - 16
MNX 18 MNX-G1 10 - 16
MNX25 MNX-G1 16 - 20
MNX25 MNX-G1 20 -25
MNX32 MNX-G1 20 -25
MNX32 MNX-G1 25 -32
MNX40 MNX-G3 32 -40
MNX45 MNX-G3 32 -40
MNX50 MNX-G3 40 -50
MNX70 MNX-G3 50 -58
MNX80 MNX-G3 55 -63
9
_ _ . " ' 0 - _ + ;& 1 , [ . $ " ' _ _ ' "0.125 0.09 0.4 MNX 9 MNX-GO 0.25 - 0.4
0.16 0.12 0.45 MNX 9 MNX-GO 0.4 - 0.63
MNX 9
MNX 9
MNX 9
MNX 9
MNX 9
MNX 9
MNX 12
MNX 12
MNX 12
MNX 12
MNX 12
MNX 12
MNX 12
MNX 12
MNX 12
MNX18
Mo to r R a tin g 4 15V , 3 ph. Relay
0.2 0.15 0.57
0.25 0.19 0.75
0.33 0.25 0.9
0.5 0.37 1.2
0.75 0.55 1.6
0.75 2.1
1.5 1.1 2.7
1.75 1.3 3
2 1.5 3.5
2.5 1.8 4.8
3 2.25 5
4 3 6.4
5 3.7 7.9
6 4.5 9
7.5 5.5 11.2
10 7.5 14.8
Mo to r R a tin g 4 15V , 3 ph. Relay_ _ - " 1 0 - _.125 0.09 0.4
0.16 0.12 0.45
0.2 0.15 0.57
0.25 0.19 0.75
0.33 0.25 0.9
0.5 0.37 1.2
0.75 0.55 1.6
0.75 2.1
1.5 1.1 2.7
1.75 1.3 3
2 1.5 3.5
2.5 1.8 4.8
3 2.25 5
4 3 6.4
5 3.7 7.9
6 4.5 9
7.5 5.5 11.2
10 7.5 14.8
12.5 9.3 19
15 11 22
17.5 13 24
20 15 29
25 18.6 35
30 22.5 40
35 26 47
40 30 55
45 33.5 60
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O v e r a l l D i m e n s i o n s
MNXGONXG1/G2
AUX-F
0 0 0
0~ C D~~
D
0 0 0
45
I 2 5 ! I
~
10
MNXG3
160
All Dimensions in mm
Door Coupling Handle* for MNX G1, G2, &G3
1 a=mm 2a=mm I
MNX G1 125-240 100-125
MNXG3 200-317 177-200
* Not applicable for MNX GO
Up to cover hinge
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L& T SWITCHGEAR
. . . .-T r i p p i n g C h a r a c t e r i s t i c s
MNXG1/GO
2h--20
( / ) + 10
~::J 5
~t-~0
{:l 20
s 10(J
: f -2~
"0c
8c 1 . l 50
\ M N X G 1 / G O
\
~
<,
" r - . . . . .
<,r-,
<
<
1 \- - - -
.5 2 3 4 6 8 10 15 20 30
x R a te d O p er at io na l C u rr en t - -- -- -- -. .
MNXG3
2h--20
( / ) + 10
~::J 5
~L~t 40
{:l20
§ 10(J
: t ~0C
8c 1 . l 50
\ M N X G 3
\\
I\.-,
<,
<,
r-.<r - - -
\
- - - -.5 2 3 4 6 8 10 15 20 30
x R ate d O pe ra tio na l C urre nt --------..
11
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REGISTERED OFFICE AND
HEAD OFFICE
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P. O. Box 278
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Product improvement is a continuous process. For the latest information and special applications, please contact any of our offices listed here.
L&T SWITCHGEAR
Electrical Standard Products
Larsen & Toubro Limited
Powai Campus, Mumbai 400 072
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LARSEN & TOUBRO
It's all about Imagineering
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