Voltage Limiting Device (VLD-O type)Voltage-Limiting-Device-VLD-O-type

Main characteristics
The voltage limiting device function is to control the voltage of the RAIL (negative polarity) in d.c.
traction systems according to the EN 50122-1 Standard (2011 Edition).
Its structure consists of two main devices connected in parallel:
- One electromechanical switch
- One electronic switch (SCRs technology).
Reference standard
- EN 50122-1 (2011 Edition)
- EN 50124-1
- EN 50123-1,3,6,7
- Insulating materials: NEMA LI-1 gPO3, EN 60893
- Wiring materials: CEI UNEL 35368, CEI 20-38, 20-37, 20-22 II, 20-3

Voltage limiting devices Protection
degree
Nominal
voltage
Nominal
current
Making
capacity
Braking
capacity
     [V]  [A] [kA] [A]
 Nominal Voltage 750 V; natural air cooling        
 ADMTN 50-08-A  IP21  750  1000 30 1000
 Nominal Voltage 1500 V; natural air cooling        
 ADMTN100-15  IP21  1500  2500 60 1000

Voltage-Limiting-Device-VLD-O-typeimg

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