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 |