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 voltage 1140v AC
b. Rated current 630A
c. Convention thermal current 630A
d. Rated short circuit breaking current 12.5KA(1140V, COSΦ=0.3)
e. Rated short circuit breaking times 16times(Closing-Opening 10 times, Opening 6 tiems)
f. Rated working frequency 50HZ
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 time 120~200ms
m. Resistance of single phase closing circuit ≤100μ href=”″ title=”Ω” Ω
n. Opening distance 3.0~4.0mm
o. Over travel distance 1.8~2.2mm
p. Auxiliary contacts 3NO+3NC


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

Table 1 Coil parameters

Rated working voltage Rated working current Coil resistance
Closing coil 220V AC 7.2A 15Ω
Opening coil 48V DC 0.8A 60Ω
Under voltage coil 48V DC 0.1A 480Ω


Table 2 Power frequency withstand voltage test

Power frequency withstand voltage Testing time
Main circuit fracture 10kv 1min
Phase to Phase 3500v
Main circuit to body case 3500v
Main electromagnet coil to body case 1500v
Under voltage coil, Opening coil to body case 500v

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. Altitude no more than 2000m
c. Humidity Relative humidity no more than 50% (under ambient temperature: 40℃)
d. Class of pollution 3 class
e. Installation type Main circuit Ⅲ, Control circuit Ⅱ
f. Installation condition Vertical installation, inclination degree<15°
g. Auxiliary switch using type AC-15, DC-13