Medium voltage indoor vacuum circuit breaker BB-LE-12.5 is designed to three-phase alternative-current of frequency 50 Hz and voltage up to 12 kV distributional systems switch in normal and emergency operational modes

 

Applications

Vacuum circuit breakers BB-LE-12.5 are used in switchgear units with voltage 6 or 10 kV and substations 110/10(6), 35/10(6), 10(6)/0.4 kV for infrastructure, metallurgical, producing, petrochemical industry, power generation facilities

 

Construction

BB-LE-12.5 corresponds vacuum circuit breaker with firm insulation and encapsulated in epoxy resin pole units

Vacuum interrupters use petal type contacts for superior dielectric strength and better performance characteristics  

Vacuum circuit breaker ВВ-LE-12,5 can be mounted on a withdrawable part

 

Reliability

Conforms to State Standard of Ukraine 27.1-35036863-018:2014

 

Reference designation structure

     1        2      3      4        5   6   7

ВВ-LE-12,5-ХХ/ХХХХ-ХХХх-ХХ

1 – Vacuum circuit breaker

2 – Rated operational voltage [kV]

3 – Turn-off rated current [A]

4 – Rated current [A]

5 – Pole-center distance [mm]

6 – Modification:

S – fixed;

В –withdrawable

7 –Climatic region modification und placement category under GOST 15150

 

 

Order designation example:

ВВ-LE-12,5-25/630-150v N3  SS U 27.1-35036863-018:2014

 

Technical data of BB-LE-12.5

Parameter	Values
Rated voltage [kV]	10
Rated operational voltage [kV]	12.5
Short withstand voltage [kV]	42
Storm impulse test voltage [kV]	75
Rated frequency [Hz]	50
Rated current [A]	630				1250						1600				2000, 2500		3150, 4000
Pole-center distances [mm]	150		210		150		210			275	210		275		275		275
Fault clearing rated current  [kA]	25	31,5	25	31,5	25	31,5	25	31,5	40	40	31,5	40	31,5	40	31,5	40	40
Short-time current [kA]	63	80	63	80	63	80	63	80	100	100	80	100	80	100	80	100	100
Rated operating sequence	C – 0,3 с – O C – 180 с – CO
Opening time [ms]	20 – 50
Arc extinction time [ms]	≤ 15
Closing time [ms]	30 – 70
Average opening speed [ms]	0,5 – 0,8
Average closing speed [ms]	0,9 – 1,2
Three-phase opening and closing asynchrony	≤ 2