Indoor DC disconnectors

Application

Indoor DC disconnectors are intended for the operational control of no-load DC circuits. Devices of this type are used in electric transport traction substations and at industrial enterprises. The indoor DC disconnector provides isolation of the bushing from the power source, as well as sectioning or disconnection of various sections of contact networks.

Thanks to its modular design, the indoor DC disconnector allows creating a variety of combinations and options.

Design

Insulators, main busbars, silver-plated contacts, electrically insulating pull rods, and a drive (manual or motor) are mounted on an aluminum platform. The disconnector installed in the switchgear panel creates a visible safe break in the current circuits.

Advantages of the indoor DC disconnector

Self-cleaning silver-plated contacts
Silver-plated
High short-circuit withstand capability
Simple modular design
High reliability
No spare parts required
Easy maintenance
Large number of possible combinations
Compliance with IEC 60947-3 requirements

Ordering example: Indoor DC disconnector 18.20.1.M.2.3 Indoor DC disconnector for rated voltage 1.8 kV DC, rated current 2000 A, 1-pole, with motor drive for 220 V DC and auxiliary contacts 3NO + 3NC.

Technical specifications:

Rated operating voltage, Ue, V DC

1800, 3600

Rated impulse withstand voltage, Uimp, kV

18

Rated short-time withstand current Icw, kA

50

Rated uninterrupted current Iu and rated operating current, Ie, A DC

2000, 4000, 6300, 8000, 10000

Auxiliary contacts

1, 3, 4 or 6 pairs NO/NC

Rated voltage of auxiliary contacts, V AC/DC

from 24 to 230

Rated current of auxiliary contacts, A

0,27

Minimum permissible current of auxiliary contacts, mA

10

Mechanical endurance (minimum)

20000

Altitude above sea level, m

1500

Total making / breaking time with motor drive, no more than, s

2

Operating temperature, C°

From -5 to +40