Vacuum Circuit Breaker

This product mainly used in 1140v or 660v three phases electrical distribution system. It is used to distribution power, circuit protection and power equipment. It is also popular in railway, mine, electricity and so on. The product structure is vertical design. Vacuum chamber, electromagnet and latched device is up-down structure. Adjustment and maintenance are easy. It has high breaking ability, high reliability and long working life. Its in and out bus bar is at the back of the circuit breaker. And the bus bar is plug-in type, can be installed as explosion-proof feed switch easily. This circuit breaker should be used together with electronic tripper.

a. Rated voltage1140v AC
b. Rated current630A
c. Convention thermal current630A
d. Rated short circuit breaking current12.5KA(1140V, COSΦ=0.3)
e. Rated short circuit breaking times16times(Closing-Opening 10 times, Opening 6 tiems)
f. Rated working frequency50HZ
g. Electrical life≥3000times AC-2
h. Mechanical life≥10000times AC-2
i. Inherent closing time≤100ms
j. Inherent opening time≤30ms
k. Three phases unsynchronized time<1.5ms
l. Electromagnet power on time120~200ms
m. Resistance of single phase closing circuit≤100μ href=”″ title=”Ω” Ω
n. Opening distance3.0~4.0mm
o. Over travel distance1.8~2.2mm
p. Auxiliary contacts3NO+3NC


Connection drawing (Fig 1), Outline dimension and installation drawing (Fig 2). Other parameters (Table 1, Table 2).

Table 1 Coil parameters

Rated working voltageRated working currentCoil resistance
Closing coil220V AC7.2A15Ω
Opening coil48V DC0.8A60Ω
Under voltage coil48V DC0.1A480Ω


Table 2 Power frequency withstand voltage test

Power frequency withstand voltageTesting time
Main circuit fracture10kv1min
Phase to Phase3500v
Main circuit to body case3500v
Main electromagnet coil to body case1500v
Under voltage coil, Opening coil to body case500v

1. Vacuum chamber
2. Over-travel spring
3. Rotating arm
4. Screw
5. Manual tripper
6. Under voltage tripper
7. Axle shaft
8. Holding hook
9. Shunt release

a. Ambient temperature-5℃- +40℃
b. Altitudeno more than 2000m
c. HumidityRelative humidity no more than 50% (under ambient temperature: 40℃)
d. Class of pollution3 class
e. Installation typeMain circuit Ⅲ, Control circuit Ⅱ
f. Installation conditionVertical installation, inclination degree<15°
g. Auxiliary switch using typeAC-15, DC-13