Siemens SIMOSEC Operating Instructions Manual page 18

Description
Principle of fuse tripping
18
Features
• HV HRC (current limiting) fuses according to DIN 43625 (main dimensions) with striker
pin in "medium" version
• Thermal striker pin tripping when the corresponding Bussmann HV HRC (current limi-
ting) fuse is used.
• Dimension e=21.14 in (537 mm) up to 27 .6 kV preset at the factory
• Option: Dimension e=17 .4 in (442 mm) possible with extension tube (95 mm)
• Open the cover for fuse replacement is only possible when:
- the feeder is grounded, so you can open the door
- the compartment cover is unscrewed
• Option: When the cable compartment door is opened, the switch cannot be operated
from the "GROUNDED" position to the "OPEN" position
• Option: Shunt release on the operating mechanism of the three-position switch-dis-
connector
• Option: "TRIPPED indication" of the fuse in the fuse switch panel switch at a remote
electrical indication with a normally-open contact (1NO)
• Option: "FUSE BLOWN" indication with a microswitch
In the event that a HV HRC (current limiting) fuse has tripped (striker pin tripped), the
three-position switch-disconnector of the transformer feeder is tripped via a time relay or
via a linkage provided at the fuse contact.
Fig. 14: Principle of fuse tripping
a
Striker pin not tripped (fuse intact)
s
Striker pin tripped (fuse blown)
REVISION 02 * DESCRIPTION SIMOSEC * 832-6063.0