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Wenzhou Unisun Electric Co., Ltd.

Fuse Switch Disconnector, Switch Disconnector Fuse, Switch Disconnectors manufacturer / supplier in China, offering Medium Voltage Air Insulated Fuse Switch Disconnectors, Air Insulation 17.5kv Ring Main Unit (ISM6), Air Insulation 24kv Ring Main Unit ISM6 and so on.

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Supplier Homepage Product Load Break Switch Medium Voltage Air Insulated Fuse Switch Disconnectors

Medium Voltage Air Insulated Fuse Switch Disconnectors

FOB Price: US $100 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $100/ Piece
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Production Capacity: 50000
Transport Package: Wooden
Payment Terms: L/C, T/T, Western Union, Paypal, Money Gram

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Basic Info
  • Model NO.: NAL NALF
  • Structure: Three-column Disconnector
  • Operation: Manual
  • Movement Mode: Horizontal Rotary Type
  • Grounding: Single Ground
  • Run: Turn the Horizontal
  • Common Model: Nal Nalf
  • Certification: ISO, RoHS, CE, ISO9001
  • Rated Voltage: 12kv / 17.5kv / 24kv /36kv
  • Short Circuit Making Capacity: 67 / 50
  • Standards: IEC
  • Specification: 12KV/24KV / 36KV
  • HS Code: 8535900090
  • Type: High-voltage
  • Installation: Indoor High-voltage
  • Grounding Mode: Grounding
  • Number of Poles: Three Pole
  • Series: Three
  • Switching Mode: Single Throw-in
  • Structure of Operating: Pneumatic
  • Brand: Unisun
  • Rated Current: 400A / 630A / 1250A
  • Peak Withstand Current: 82 / 66
  • Trademark: UNISUN
  • Origin: China
Product Description

Medium Voltage Air Insulated Fuse Switch Disconnectors

1) Description

iNAL and iNALF switch disconnectors are based on a modular principle, which gives it a wide range of functionality. With a unique design that extinguishes electric arcs and enables high switching capacity, they represent an attractive solution as a key breaking element for applications in enclosed switchgear and transformer compact substations. In combination with type XRNT current limiting fuses, iNALF fuse switch disconnectors ensure control over the full range of overload and short-circuit currents.

The switch disconnector system iNAL/iNALF are consists of a frame with insulators and current carrying parts. Two different types of operating mechanisms, snap action mechanism type K or stored spring energy mechanism type A, can be mounted on the frame. Fuse bases type F, with or without fuse tripping mechanism, and an earthing switch type E/EB, suitable for both wall mounting and switchgear mounting.

Customer also can order shunt trip, under voltage release, auxiliary switches, motor operation.

The main areas of application of iNAL/iNALF switch disconnectors are as:

  • Line switch disconnectors in medium-voltage networks
  • Switch disconnectors with fuses for the switching and protection of Distribution transformers &Motors

2) Standard

IEC60129, IEC60265, IEC60694, CSA C22.2, No. 193, and IEC 62271-105,ANSI No. C37.20.4

3) Main product features

A iNAL disconnector (which interrupts load currents up to 1,250 A) and a small fault-current circuit combined with a fuse base (F) and current limiting fuses (which break large short-circuit currents) create a iNALF-type disconnector that provides protection against a major fault types in a modern electric network.

    • Switchgear equipped with iNAL switch disconnector
    • Structure of panel with iNAL switch disconnector
    • iNALF 36 KV fuse switch disconnector

4) Basic designs


The standard feature consists of chassis, insulators and current carrying parts with the following pole distance:

  • 12 kV - pole distance 150 mm, 170 mm and 210 mm
  • 17.5 kV - pole distance 170 mm and 210 mm
  • 24 kV - pole distance 170 mm*, 235 mm and 275 mm
  • 36 kV - pole distance 360 mm

* with insulating barriers

Rated currents are:

  • 400, 630 and 1250 A up to 24 kV
  • 630/800/1000 A for 36 kV


Is delivered with the same pole distances as the standard feature. Fuse base type F is delivered for installation on both the opening

and pivot sides, with or without automatic tripping. A fuse base with six insulators can also be delivered separately with some form of signal indication when a fuse blows or for installation on the pivot side of the switch.

5) Technical specification

Switch disconnector type iNAL

The switch disconnector complies with IEC standards 60129, 60254 and 60694 concerning general purpose switches and IEC Standards 420 and 62271-105 regarding correct co-operation between switch disconnector and fuse.

Rated voltageUnkV1217.52436
Rated currentInA400630125040063012504006301250630800800
Max. rated currentIA4006301150400630115040063011506308001000
Short circuit making capacityImakA peak.676767505050505050505050
Peak withstand currentIdynkA peak.828282828282828282666666
Short time current 1 sec.IthkA eff.31.531.531.531.531.531.531.531.531.5   
2 sec.252525252525252525252525
3 sec.202020   161616   
Mainly active load breaking capacity1)(test duty 1 and 2, IIEC 60265-1 (IEC 265))IA400630125040063012504006301250630800800
Rated cable/line charging breaking capacity IEC 60265-1(IEC 265))IA1501501501005)1005)1005)808080454545
Mainly inductive breaking capacity cos φ = 0,15 A161616161616161616163)163)163)
Rated earth fault breaking capacity IEC 60265-1(IEC 265)              
Earth fault breaking capacity, fig. 6IA150150150707070757575   
Capacitive breaking capacity, fig. 7IA90909040404031.531.531.5505050
Max. breaking capacity in co-operation with fuses IEC 62271-105 (IEC 420 1990-11) A16001600 16001600 900900 300*
Max. fuse size2)InA125125 125125 8080 4040
Power frequency withstand voltage 50 Hz 1 min.:      
- to earth and between poles kV42455580
- across isolating distance kV42607088
Impulse withstand voltage 1.2/50 µs:      
- to earth and between poles kV7595125170
- across isolating distance kV85110145195
Pole distance mm150, 170, 210170, 2101704), 235, 275360
Max. operating torque at:   80-100 Nm
-  closing K/A mech. Nm115-120 NmK mech. 80-100 Nm
-  opening K/A mech. NmK mech. 120 Nm/A mech. 3 Nm/ A mech. 3 Nm
Operating angle on the shaft degrees130120
Arc time ms40 - 6060

6) Our Company
Medium Voltage Air Insulated Fuse Switch Disconnectors

7) Hot Products
Medium Voltage Air Insulated Fuse Switch Disconnectors

8) Contact Us
Mobile phone: +8613165889669
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