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