PRODUCT CATALOG
PROTECTIVE DEVICES
Middle South Union Electric Co.Ltd.
Wenzhou Bridge Industry Zone,Beibaixiang Town
Yueqing City,China.
SUB-STATION SWITCH
The Sub-station Switches manufactured by Middle South Union Electric Co. Ltd., fully comply the
respective International Standards of ANSI and IEC. The switches have been tested by internationally recognized Laboratory and successfully passed all relevant tests. Quality materials and
latest production technology have made these switches more reliable and durable. Some salient
features of the switches are mentioned below;
1. Silver-plated hard drawn solid Copper Blade ensures greater rigidity & conductivity.
2. Silver-plated Hard Drawn Copper Contacts ensure uniform conductivity with self wiping characteristics.
3. Tin-Plated Bronze Parallel Groove Terminal Pads ensure firm contact of conductors & switch
terminals.
4. Hot Dipped Galvanized Structural Steel Channel ensures strong switch support.
5. The switches have very low operating torque and are virtually maintenance free.
VOLTAGE REGULATOR BYPASS SWITCH
Outdoor Single Pole hook operated Voltage Regulator Bypass Switch, Type/ Model: MSU-15.4
of Middle South Union Electric Co. Ltd., can be used in 11 KV, 50 Hz distribution lines in a tropical climate with an average ambient temperature of 40°C and high annual rainfall . These
switches are to be vertically mounted and manually operated. The switch ratings fully comply
with ANSI C37.30 and ANSI
TECHINICAL DETAILS:
Nominal System Voltage
Maximum Voltage
Basic Insulation Level
Continuous Current Rating
Momentary Current Rating
Short Time Current (3 sec)
Connector Range
Mounting Position
:
:
:
:
:
:
:
:
11 KV
15.5 KV
110 KV
400 A
65 KA
25 KA
# 4 to 4/0
Vertical
SUB-STATION SWITCH
FUSED RECLOSER BYPASS & DISCONNECT SWITCH
TECHINICAL DETAILS:
Nominal System Voltage
Maximum Voltage
Basic Insulation Level
Continuous Current Rating
Momentary Current Rating
Rated Max. Fused Current
Symmetrical Int. Current
Connector Range
Fuse Tube
Fuse Link
Fused current (max)
Current carring contract
:
:
:
:
:
:
:
:
:
:
:
:
11 KV
15.5 KV
110 KV
600 A
65 KA
200 A.
7100 A
2/0-350 MCM
Bone fiber lining
100T
200A
Silver plated
DISCONNECT SWITCH, SINGLE POLE
Outdoor Single Pole Hook operated Disconnect Switch, Type/ Model: MSU-18.6 & MSU-19.6 of Middle
South Union Electric Co. Ltd., can be used in 11 KV & 33 KV, 50 Hz distribution lines in a tropical climate
with an average ambient temperature of 40°C and high annual rainfall. These switches are to be
mounted in horizontally under hung or vertical position and manually operated. The switch ratings fully
comply with ANSI C37.30 and ANSI C37.34.
TECHINICAL DETAILS:
Type/ Model
MSU-18.6
Nominal System Voltage
11 KV
Maximum Voltage
15.5 KV
Basic Insulation Level
110 KV
Continuous Current Rating 600 A
Momentary Current Rating 65 KA
Short Time Current
25 KA
Connector Range
#6to500mcm,Cu/Al
Mounting
Hor. under hung
Blade open position
160°
Operation
Manual with Hot stick
Load Brick
Hook attachment
Current Carrying Contrat
Silver plated
Connector accommodation Tin plated parallel grove.
MSU-19.6
33 KV
38 KV
200 KV
600 A
65 KA
25 KA
#6to500mcm,Cu/Al
Vertical
160 °
Manual with Hot stick
Hook attachment
Silver plated
Tin plated parallel grove.
SUB-STATION SWITCH
VOLTAGE REGULATOR BYPASS & DISCONNECT SWITCH
Outdoor Single Pole Hook operated Regulator Bypass & Disconnect Switch, Type/ Model: MSU5.12 of Middle South Union Electric Co. Ltd.,can be used in 11 KV, 50 Hz distribution lines in a
tropical climate with an average ambient temperature of 40°C and high annual rainfall. These
switches are to be mounted in vertical position and manually operated. The switch ratingsfully
comply with ANSI C37.30 and ANSIC37.34
TECHINICAL DETAILS:
Type/ Model
MSU-5.12
Nominal System Voltage
11 KV
Maximum Voltage
15.5 KV
Basic Insulation Level
110 KV
Continuous Current Rating
1200 A
Momentary Current Rating(peak)
65 KA
Short Time Current (rms)
25 KA
Connector Range
350 mcm
Mounting
Vertical
Offset
15°
Vertical Stop
90°
Contact
Silver Plate
Interrupter
are interruption device
THREE-POLE GANG-OPERATED AIR-BREAKER SWITCH
Outdoor Gang operated Three-Pole Air Break Switches with Load Interrupters, Type/ Model :
MSU-13.6 & MSU-14.6 of Middle South Union Electric Co. Ltd., can be used in 11 KV 38 KV,
50 Hz Power distribution lines in a tropical climate with an average ambient temperature of
40°C and high annual rainfall. These switches are to be mounted in horizontal position and
manually gang operated. The switch ratings fully comply with ANSI C37.30 and ANSI C37.34.
TECHINICAL DETAILS:
Type/ Model
Nominal System Voltage
Maximum Voltage
Basic Insulation Level
Continuous Current Rating
Momentary Current Rating
Short Time Current
Connector Range
Contact
Operating System
Knife Operation
Connol Rod Length
Terminal Pad
Break/interrupter
MSU-13.6
MSU-19.6
34.5 KV
33 KV
38 KV
38 KV
200 KV
200 KV
600 A
600 A
65 KA
65 KA
25 KA
25 KA
4/0 Al or Cu #6to500 mcm
Silver plated
Three phase gang operated
Horizontal/Vertical
30’ with Handle
NEMA 2 hole 4/0
Load Break/interrupter
SUB-STATION SWITCH
SINGLE POLE DROP OUT FUSL HOLDER
Outdoor Single Pole hook operated Drop Out Fuse Holder, Type/ Model: MSU-6.002 of Middle
South Union Electric Co. Ltd., can be used in 33 KV, 50 Hz distribution lines in a tropical climate
with an average ambient temperature of 40°C and high annual rainfall. The Drop out Fuse
Holder is to be vertically mounted and manually operated by hook stick. This Drop out Fuse
Holder ratings fully comply with ANSI C37.30 and ANSI.
TECHINICAL DETAILS:
Rated Maximum Voltage
38 KV
Nominal System Voltage
34.5 KV
Rated Frequency
50 Hz
Basic Insulation Level (BIL)
200 KV
Rated Continuous Current
200 Amps
Connector Range
6-500 mcm
Mounting Position
Vertical
Offset
15 °
Blade Strip at open position.
160°
RIV Test voltage(KV)
RIV Limit (at 1 MHz)
23.0 KV 500 micro volt
Construction :
Complete with drop out fuse holder,175E standard speed power fuse similar to S & C type
SMD-20 Cat-No.192504-L station styles.
MSU Series Power Fuses are especially suited for protecting transformers, capacitor banks,
and cables in outdoor distribution substations through 34.5 kV. They incorporate precisionengineered non damageable silver or nickel-chrome fusible elements with time-current characteristics that are precise and permanently accurate — assuring not only dependable performance, but also continued reliability of system coordination plans.
With MSU Series Power Fuses, source-side devices may be set for faster operation than practical with other power fuses or circuit breakers, thereby providing better system protection without compromising coordination.
These fuse units are offered in a variety of ampere
ratings, in four different speeds Standard, Slow and
Very Slow. They provide interrupting ratings of up to
25,000 amperes symmetrical at 50 Hz.
This broad selection of ampere ratings and speeds
permits close fusing to achieve maximum protection
and optimum coordination. SZ Series Power Fuses
are manufactured in accordance with a quality
system certified to ISO9001:2008.
SUB-STATION SWITCH
Amperes Ratings
Fuse Type
KV Rating
Nominal
Fast
Standard
Slow
Very Slow
Maximum
Interrupting
MSU-38-15K
MSU-38-15E
MSU-38-15SE
MSU-38-15SSE
15
6700
MSU-38-20K
MSU-38-20E
MSU-38-20SE
MSU-38-20SSE
20
6700
MSU-38-25K
MSU-38-25E
MSU-38-25SE
MSU-38-25SSE
25
6700
MSU-38-30K
MSU-38-30E
MSU-38-30SE
MSU-38-30SSE
30
6700
MSU-38-40K
MSU-38-40E
MSU-38-40SE
MSU-38-40SSE
40
6700
MSU-38-50K
MSU-38-50E
MSU-38-50SE
MSU-38-50SSE
50
10000
MSU-38-65K
MSU-38-65E
MSU-38-65SE
MSU-38-65SSE
65
10000
MSU-38-80K
MSU-38-80E
MSU-38-80SE
MSU-38-80SSE
80
10000
MSU-38-100K
MSU-38-10SE
MSU-38-100SE
MSU-38-100SSE
100
10000
MSU-38-125K
MSU-38-125E
MSU-38-125SE
MSU-38-125SSE
125
10000
MSU-38-150K
MSU-38-150E
MSU-38-150SE
MSU-38-150SSE
150
10000
MSU-38-175K
MSU-38-175E
MSU-38-175SE
MSU-38-175SSE
175
10000
MSU-38-200K
MSU-38-200E
MSU-38-200SE
MSU-38-200SSE
200
17500
MSU-38-300K
MSU-38-300E
MSU-38-300SE
MSU-38-300SSE
300
25000
34.5 KV
Maximum
38 KV
BIL 200 KV
SUB-STATION SWITCH
Blown Fuse Indicator
(In-blown fuse Position)
Contact Rod
Upper end fittings
Clamp Screw
Locking Pin
(Inside Bore)
Locking Slot
(Inside Bore)
Lower end fittings
Upper Seal
Actuating Pin
extends through upper
seal when fuse unit
is blown and extends
the blown-fuse indicator
Locking Slot
Fuse Unit
Fuse Unit
with end fittings
and muffler
attached
Lower Ferrule
Blue cap
(remove and discard
before installing muffler)
Locking Pin
Shoulder
Muffler
0.944
DIA
Fuse Unit Fittings
kV
Max.
A
B
C
17
19.08
27.19
28.82
27
22.56
30.69
32.32
38
28.76
36.87
38.50
1.244
DIA
B
REF.
A
C
LIGHTENING ARRESTER
MSU surge arresters protects substation and polemounted equipment from voltage impulses
or surges resulting from lightning strokes, system faults, circuit switching, load rejection or
other events.
MSU design Station Intermediate and Distribution classes arrester to be used on 33 KV and
11 KV systems respectively, and provided with Gapless Valve Elements.
REFERANCE STANDARD
MUS Lighting Arrester designed and manufactured in accordance with – ANSI/IEEE C62.22,
ANSI C62.2, ANSI/IEEE C62.11: IEEE, ANSI/IEEE C62.1, NEMA Pub. No. PH25, ANSI/ASTM
A153, ANSI , B18.21.1.
TYPE / MODEL:
9KV Distribution Class L/A
9KV Station Class L/A
33/36KV Station Class L/A
:
:
:
GBZN - 11KV
GBZNS - 11KV
GBZN - 33KV
TECHNICAL FEATURES:
SERVICE CONDITIONS:
a. Ambient temperature above 40°C
b. Maximum relative humidity 90 %
c. Altitude up to 1,000 meters above sea level
d. Nominal system frequency 50 Hz
The surge arrester have following protective characteristics
a. Rated Voltage(RMS)
b. Max Continuous Operating Voltage (MOV)
c. Standard Nominal discharge
current (8/20 micro second)
d. Lightning impulse (8/20 micro second)
maximum residual voltage
e. Impulse withstand level
on the arrester housing.
i) Lightning impulse voltage
ii) Power frequency voltage (dry)
iii) Power frequency voltage (wet)
9/9 KV
7.65 KV
33/36 KV
29 KV
5/10 KA
5/10 KA
35 KV
110 KV
95 KV
35 KV
30 KV
200 KV
95 KV
80 KV
CONSTRUCTIONS:
a. Gap less Arresters with elements of zinc oxide to perform both the surge discharge and power
frequency reseal functions.
b. 9 KV Distribution type arrester provided with an ISOLATOR to ensure positive isolation and visual
i dentification if arrester becomes damaged internally.
LIGHTENING ARRESTER
INSULATORS
Arresters shall be protected in a hermetically sealed wet process porcelain or polymer jacket,
with a high Creepage distance and a high dielectric strength.
CONNECTORS
a. Both line lead and isolator terminals of distribution class arresters shall accommodate # 6
solid through 1/0 AWG stranded copper or aluminum conductors.
b. The high voltage terminal of Sub-Station class arrester accommodate 1/0 through 4/0 AWG
MHD bare Copper or Aluminum conductors. The ground terminal accommodate 1/0 AWG
MHD bare Copper or Aluminum conductor. The high side voltage terminal to be provided on the
top of the arrester and both the line and ground terminal shall be a two-hole or four-hole standard pad NEMA connector.
MOUNTINGS
Supplied with a cross arm mounting bracket. Intermediate & Sub-station class arresters shall
be equipped with (3) 14-22 mm dia slots (120 degree apart), 222-254 mm dia Bolt Circle
Equipment/ structure mounting arrangement. All exposed steel or iron parts of the arrester
including all mounting bolts, Lock washers shall be hotdip galvanized.
PROTECTIVE CHARACTERISTICS
MSU arresters have the following protective characteristic based on per unit crest arrester
rating as summarized from ANSI C 62.22
Station and Intermediate Class Arrester Characteristics
Steady state Operation System Voltage & Arrester Protective Leve ls Range if Industry Maximum Per Unit
Ratings
Crest of MCOV
Maximum
System
Voltage
L-L
(KV/rms)
Minimum
System
Voltage
L-G
(KV/rms)
Minimum
MCOV
Rating
Duty Cycle
Rating
(KV/rms)
0.5 micro sec
Discharge
Voltage
(DV)
8/20 micro
sec wave DV
Switching
Surge-DV
Maximum
High-Amp
withstand
Crest
Amps
13.1
7.56
7.65
9-12
2.33-2.48
1.97-2.23
1.70-1.85
6500
13.9
8.03
7.65
9-15
2.33-2.48
1.97-2.23
1.70-1.85
6500
36.2
20.90
22
27-36
2.43-2.48
1.97-2.23
1.70-1.85
6500
2.28-2.55
1.80-2.10
6.500
Intermediate Class
4.37-169
2.52-97.57
2.8-98
3-144
2.38-2.85
LIGHTENING ARRESTER
Distribution Arrester Protective Characteristics
Distribution Class
Steady state Operation System Voltage & Arrester
Ratings Crest of MCOV
Protective Levels Range if Industry Maximum Per Unit
Crest of MCOV
FOW Protective level Discharge Voltage with 8/20 micro
Sec Wave
Maximum
System
Voltage
L-L
(KV/rms)
Minimum
System
Voltage
L-G
(KV/rms)
Minimum
MCOV
Rating
Duty Cycle
Rating
(KV/rms)
5 KA
ND
10 KA
HD
5KA
ND
10 KA HD
13.1
7.56
7.65
9
33.5-36
26.5-35.3
30.0-33.5
21.7-31.5
13.9
8.03
8.4
10
36.0-37.2
29.4-39.2
31.5-33.8
24.5-35
36.2
20.90
24.4
30
107.0-108
85.0-109.5
94.5-99
71.8-99
36.2
20.90
29
36
125
99.0-136
116.0
83.7-125
MCOV= Maximum Continuous Operating Voltage
ND= Normal Duty
HD= Heavy Duty
PACKAGING
Each Surge Arrester shall be clearly marked
with the manufacturers name, catalog number
and below marking information:
a. Arrester classification
b. Manufacturers identification or symbol
c. Arrester model and identification
number
d. Arrester voltage rating
e. Date of manufacture
33/36 KV Station Type
Lightening Arrester
9/9 KV station Type
Lightening Arrester
Distribution fuse cutouts designed and manufactured in accordance with ANSI C37.42. Distribution Fuse cutouts Model: GBZN - 15KV is open, expulsion, drop-out type & mounted by means
of steel brackets on wood poles and cross arms. The cutouts are intended for use with buttontype fuse links meeting the interchangeability requirements of ANSI C37.42.
DISTRIBUTION FUSE CUTOUT
REFERANCE STANDARD
Distribution fuse cutouts Model: GBZN - 15KV designed and manufactured in accordance with
– ANSI/IEEE C37.40, ANSI C37.41, ANSI C37.42, ANSI B18.21.1, ANSI A153.
TECHNICAL FEATURES
SERVICE CONDITIONS
a. Temperature - up to 40°C
b. Altitude - up to 1,000 meters
Rated Voltage
a. Nominal System Voltage - 11,000 Grd Y/6,350 volts
b. Rated Maximum Voltage - 15,000 volts
c. Low Frequency Withstand KV, RMS dry, 60 sec. - 35
wet, 10 sec. - 30
d. Rated Impulse Withstand Voltage - 95 KV.
e. Rated Frequency - 50 Hertz.
f. Rated Continuous Current - 100 amperes.
g. Rated Short Time Current
i. Momentary (1 cycle) - 10,000 amperes
ii. 15 cycles - 7,100 amperes
iii. 3 seconds - 1,600 amperes.
h. Rated Symmetrical Interrupting Current - 7,100 amperes.
DISTRIBUTION FUSE CUTOUT
ACCESSORIES
I). Fuse Support Assembly
a. Fuse Support Insulator - wet process porcelain.
b. Contacts - Silver Plated
c. Connectors - tin-plated bronze parallel groove type, for #6 to 4/0 AWG Copper or
Aluminum Conductors.
d. Load-buster tool attachment hooks.
e. Mounting Supports - provided to mount the cut-out so that the centerline of the fuse
support insulator is at an angle of 15° to 20° from the vertical.
II). Fuse Holder Assembly
a. Fuse Tube - bone fiber lining with exterior painted gray, non-expendable cap.
b. Contacts - Silver Plated
c. Fuse Link Position - the fuse tube is designed sothat the fuse link is centered in the
tube, with provision for mechanical ejection of the fuse link leader on low current faults.
d. Opening and Lifting Eyes.
e. Thumb Screw - for securing the fuse link to fuse holder assembly.
III). Mounting Bracket
Each distribution fuse cutout shall be provided with hot dip galvanized mounting bolt, lock
washer, A Type mounting bracket adjustable to accommodate standard 2.4384 meter (8 foot)
and 3.048 (10 foot) wood cross arms.
PACKAGING
Each distribution fuse cutout & its mounting bracket is packaged in a paper box clearly labeled
with below marking:
Manufacturer's Identification Product Type
Date of Manufacture*
Rated Continuous Current
Rated Maximum Voltage
Rated Interrupting Current
Basic Impulse Level
For export standard seaworthy wooden packing is available.
Middle South Union Electric Co. Ltd.
Wenzhou Bridge Industry Zone, Beibaixiang Town
Yueqing City, China.