Spring operating conventional vcb mechanism

Features :

  • Emergency closing by slow close handle.
  • Over charging protection.
  • Inbuilt dashpot.
  • Heavy duty.
  • Spring charging time of less than 10 seconds.
  • Built in manual charging lever for effortless manual spring charging.

Dimension Details:

  • Height - 650 mm
  • Width - 250 mm
  • Depth - 300 mm
  • Weight - 45 Kgs (Approx)

The Spring Operating Conventional Mechanism consists of:

  • A spring charging unit which can be charged manually or by charging motor.
  • Mechanical indicator showing spring charged/discharged condition.
  • Indicator for open/close position of the circuit breaker.
  • Closing/tripping solenoids for performing closing/opening operation of the circuit breaker electrically.
  • The NC contact of the cut-off switch is opened whenever the spring gets charged and interrupting the motor circuit.
  • Over charging protection is enabled, i.e., If the cut-off gets failure, there is no issue to Motor.
  • The spring charging mechanism can also be recharged manually by means of a charging lever.
  • The closing and opening operations can be carried out by means of the energy stored in the operating mechanism. One common Spiral spring is used to carry out the closing and opening operation of the breaker.

Technical specifications:

Nominal system voltage 11 / 33 KV
Rated Current 630 / 1250 / 1600 / 2000 A
Mechanism Type Motor wound spring operated.
Operating methodĀ  Motor / Manual.
Charging time 7 - 9 Sec
Mechanism output travel 12-14mm
Charging timeĀ  (6 - 9) / (18 - 20)
Charging Motor rating 300W - 230V AC/DC
Close / Trip coil rating 24 / 30 / 110 / 220 V - 400W


It is used in Vacuum circuit breakers in vital places like HV/LV substation, Heavy Industries etc.