LTPD/LTSD Series

LTPD/LTSD roof disconnectors are off-load switches, also called pantograph disconnectors. Depending on the model, they can connect, earth, and isolate the traction transformer from the pantograph. They are motor operated devices, designed to be installed outdoor, on the roof of an electric traction vehicle. Based on your application, you can select one of two versions:
  • LTPD version, Normally Open disconnector
  • LTSD version, Change Over disconnector. One input can be connected to one of two outputs to configure the followings:
    • Load position vs Earthing/Emergency position
    • Load position 1 vs Load position 2
Both models are suitable for single-voltage as well as for multi-voltage vehicles, covering all the typical railway line voltages (1,5 kVDC; 3 kVDC; 15 kVAC and 25 kVAC) as well as the different vehicle’s currents rated up to 2000 A.
  • Execution: Disconnector, Disconnector & earthing, Change over
  • Ratings for 25 kVAC (50 or 60 Hz) and/or 15 kVAC (16,7 Hz) and/or 3 kVDC and/or 1,5 kVDC
  • Rating for up to 2000 A
  • High short circuit withstand current: 40kA for DC systems and 30 kA for AC systems
  • Category / Operational Frequency class: A4 / C3
  • Designed for applications up to OV4, PD4
  • IEC60077 compliant
  • High rated short time withstand current
  • DC Motor Operated
  • Outdoor applications
  • Suitable for high-speed train, EMUs and locomotives
  • Suitable for outdoor applications
  • Motorized operated version
  • Bistable version, 2-position command relays
  • Control voltage: 24 – 36 – 48 – 72 – 110 VDC
  • Aux contacts: 4 NO + 4 NC
  • Pneumatic operated version
  • Monostable version, 1-position command relays
  • Low voltage connectors (all brands available)
Image Image
Series


 LTPD

 LTSD
Application Type Roof Disconnector Roof Disconnector
Rated Insulation Voltage @
OV4/PD4		 [kV] 27.5 27.5
Thermal Current @ 40°C [A] 2000 2000
Short Circuit Withstand Current for 60ms [kA] 70 70
Dimensions Length L [mm] 630 830
Width W [mm] 280 460
Height H [mm] 613 598
Weight [kg] 45 70.8