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Home > Electrical
Equipment > Low-voltage equipment
Automatic three-phase
circuit breakers VA51 and VA52
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VA51 andVA52 are two families of automatic circuit breakers
that are designed for conducting current under normal conditions and for cutting
it off in the event of a short circuit, an overload or an unacceptable voltage
drop. In addition, it can be used for infrequent (up to 6 times per day) on and
off switching of electric circuits. It is possible to use these circuit breakers
for infrequent direct starts and for the protection of asynchronous motors. VA
5X - XX - X X XX X X - XX XX
VA 5X - series of circuit breakers:
VA51 - average switching capacity circuit breakers; VA52 - extra switching capacity
circuit breakers;
"-" - separating character;
XX - rated current: 35 - 250 A; 37 - 400 A; 39 - 630 A;
"-" - separating character; X - number of poles
and number of maximum-current release devices: 3
- 3 poles with a maximum-current release device in each one;
8
- 2 poles with maximum-current release devices in two poles, in triple-pole circuit
breaker construction ; X - maximum-current release device construction,
according to the protection zone: 3
- release device in short-circuit current zone;
4
- release device in short-circuit current and overload current zones; XX
- construction according to auxiliary assembly units; X - drive
type and circuit breaker mounting method: 1
- hand drive, stationary construction;
3
- electromagnetic drive, stationary construction;
5
- remote hand drive, drawout construction;
7
- electromagnetic drive, drawout construction; X - construction according
to additional mechanisms: 0
- no additional mechanisms;
5
- remote hand drive for operating the stationary construction circuit breaker
through the distribution device door;
6
- "OFF" position blocking device for stationary construction circuit
breakers with hand drive; "-" - separating character;
XX - circuit breaker protection rate. according to GOST 14255-69: IP20,
IP00;
XX - climatic construction and placement category,
according to GOST 15150-69 and GOST 15543-70: UHL3, UHL3.1; T3.
Circuit
breaker
type | Weight,
kg |
Circuit breaker
rated current,
A | Rated
voltage
of the main circuit
, V |
Rated current
of the thermal
release devices,
A |
Response current settings of electromagnetic maximum-current release device in
short-circuit currents zone, divisible by rated current of maximum-current release
device | Maximum
switching
capacity,
kA
under U=660 V and
cos j = 0.3 |
Switching
wear resistance,
VO cycles | |
AC 50-60 Hz | DC |
under AC | under DC |
| VA 51-35 |
2.4 | 250 | up to 660 |
220 | 80 |
12 | 10 |
10 | 4000 | |
100, 125 | 8
| | 160,
200, 250 | 6 |
| VA 52-37 |
4.8 | 400 | up to 660 |
440 | 250, 320, 400 |
10 | 6 |
18 | 2000 |
| VA 51-39 | 7.5 |
630 | up to 660 | 440
| 250, 320 |
12 | 6 |
20 | 2000 | |
400 |
10 | | 500,
630 | | |
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