Page 51 - 4587

UNIT 8
DIFFERENCES BETWEEN
DISCONNECTORS, LOAD SWITCHES,
SWITCH DISCONNECTORS AND CIRCUIT
BREAKERS

1 Learn the meaning of the following words, word-
combinations and word groups:
Switching, protection, requirement, low voltage switchgear,
controlgear, disconnector, isolating switches, load switches,
disconnector, pole, input, output, visible isolation gap, suitable
design features, mechanical interlocking mechanism, stipulate,
movable contacts, fuse-disconnectors, switch-disconnectors, fuse-
switch disconnectors, circuit breakers, isolating function, 4 pole
load break switch, visible breaking function, remote tripping
function.

2 Read and translate Text 1:
Text 1

Differences between Disconnectors, Load Switches, Switch
Disconnectors and Circuit Breakers

Device Types
Various types of device are available for carrying out the
switching and protection tasks listed under title that are specially
designed to fulfil the respective requirements. The various parts of
IEC 60947 (Low voltage switchgear and controlgear) specify the
design, performance and test features of the devices.
The most important features of the main device types are
presented below:
1. Disconnectors (isolating switches)
2. Load switches
3. Switch disconnectors
4. Circuit breakers

50