Gold Member Since 2017
Audited Supplier
Wenzhou Unisun Electric Co., Ltd.

Load Break Switch, Load Switch, Un-Lbs manufacturer / supplier in China, offering Iun-Lbs Indoor Load Break Switch, 15kv 20kv Potential Voltage Transformer, 11kv Voltage Transformer and so on.

(/ )

Supplier Homepage Product Load Break Switch Iun-Lbs Indoor Load Break Switch

Iun-Lbs Indoor Load Break Switch

FOB Price: US $100 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $100/ Piece
Get Latest Price
Port: Ningbo, China
Production Capacity: 50000
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram

Request a custom order and have something just for you!

Send Customized Request
Basic Info
  • Model NO.: iUN-LBS
  • 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

iUN-LBS Load Break Switch

MV Indoor switch disconnector

load break switch iUN-LBS-36kv


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

UN-LBS 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



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


Dimensions and weights

630 A switch - 630 A disconnector                                                 Weight: 50 kg
Iun-Lbs Indoor Load Break Switch
load break switch iUN-LBS dimensions


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

Iun-Lbs Indoor Load Break Switch

load break switch iUN-LBS 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 UN-LBS 12-24 kV and 1 bar (1000 hPa) for UN-LBS 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.

Iun-Lbs Indoor Load Break Switch

load break switch iUN-LBS position

Technical Parameters of iUN-LBS 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.

Iun-Lbs Indoor Load Break Switch

iUN-LBS 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

Send your message to this supplier
Mr. Rory
To: Mr. Rory

Enter between 20 to 4,000 characters.

This is not what you are looking for? Post a Sourcing Request Now