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Wenzhou Unisun Electric Co., Ltd.

Load Break Switch, Load Switch, Sc6 manufacturer / supplier in China, offering Isc6 Indoor Load Break Switch, Air Insulation 17.5kv Ring Main Unit (ISM6), Air Insulation 24kv Ring Main Unit ISM6 and so on.

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Isc6 Indoor Load Break Switch

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
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram

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Basic Info
  • Model NO.: iSC6
  • Operation: Electric
  • Series: Three
  • Certification: RoHS, CE, ISO9001
  • Trademark: Unisun
  • Type: High-voltage
  • Grounding Mode: Grounding
  • Structure of Operating: Electric
  • Brand: Uninsun
  • Origin: China
Product Description

iSC6 Load Break Switch

MV Indoor switch disconnector

load break switch iSC6-36kv


LBSkit is a switch or switch combination is suitable for compose air insulation ring main unit for up to 36 kV.

LBSkit is designed for indoor applications, and meets requirements concerning human safety as well as ease of installation, operation and protection of the environment.



  • Upgradability
  • Compact
  • Maintenance
  • Easy installation
  • Ease and safe to operate



LBSkit units meet following standard: IEC62271-103/ IEC 62271-102/ IEC 62271-200


Dimensions and weights

630 A switch - 630 A disconnector                                                 Weight: 50 kg
Isc6 Indoor Load Break Switch
load break switch iSC6 dimensions


36KV 630 A switch - 630 A disconnector (width 750 mm)                                     Weight: 75 kg

Isc6 Indoor Load Break Switch

load break switch iSC6 36kv disconnector


Switch or disconnector and earthing switch

Gas tightness

The three rotating contacts are placed in an enclosure filled with gas to a relative pressure of 0.4 bar (400 hPa) for LBSkit 12-24 kV and 1 bar (1000 hPa) for LBSkit 36 kV. It satisfies "sealed pressure system" requirements and seal tightness is always factory checked.


Operating safety

  • The switch may be in one of three positions: "closed", "open", or "earthed", representing a natural interlocking system that prevents incorrect operation. Moving-contact rotation is driven by a fast-acting mechanism that is independent of the action of the operator.
  • The device combines the breaking and disconnection functions.
  • The earthing switch placed in the SF6 has a short-circuit making capacity, in compliance with standards.
  • Any accidental over-pressures are eliminated by the opening of the safety membrane, in which case the gas is directed toward the back of the unit, away from the operator.

Isc6 Indoor Load Break Switch

load break switch iSC6 position

Technical Parameters of iSC6 Load Break Switch

Rated voltage (kV)7.2122436
Insulation level
50 Hz, 1 minInsulation20285070
(kV rms)Isolation23326080
(kV peak)Isolation7085145195
Short-time withstand current
Short-time withstand current25630A 
(kA.1 s)20630A
Disconnector (kA/1 s)25630 - 1250 A1250 A
20630 - 1250 A
16630 - 1250 A
12.5630 - 1250 A
Maximum breaking capacity
Transformer off load (A)16
Cables off load (A)31.550
Switch (A)630
Fuse-switch ** (kA)2520

Operating mechanisms

Reliable operating mechanism

  • Switchgear status indicator:

Fitted directly to the drive shaft, these give a definite indication of the contact's position.

  • Operating lever:

This is designed with an anti-reflex device that stops any attempt to re-open the device immediately after closing the switch or the earthing disconnector.

  • Locking device:

Between one and three padlocks enable the following to be locked:

  1. access to the switching shaft of the switch or the circuit breaker
  2. access to the switching shaft of the earthing disconnector
  3. operating of the opening release push-button.

Isc6 Indoor Load Break Switch

isc6 operating mechanism

UnitsType of operating mechanism
switch/disconnectorcircuit breaker
IM, IMB, IMCΔ--    
QM, QMC, QMB Δ-    
CM, CM2, CRM   Δ   
DM1-A, DM1-D, DM1-S, DM1-Z, DM2   Δ Δ 
DM1-A(*), DM1-W   ΔΔΔ 
NSM-cables, NSM-busbars  Δ    
GAM    Δ  
SM, TM   Δ   

provided as standard

- other possibility

(*) 1250 A version

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