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The circuit breaker enclosure is protected by a hot-dip galvanized coating.
The circuit breaker is equipped with a hermetically sealed porcelain pole.
The design provides for automatic and manual spring charging.
The design features of the VB4-P circuit breaker reduce switching overvoltages by means of controlled contact separation according to a predefined contact-opening diagram.
The operating mechanism design eliminates rebound of the main contacts.
The circuit breaker allows installation of additional shunt trip coils, a direct-acting overcurrent release, and an additional undervoltage release.
The energy stored in the spring is sufficient to perform one complete automatic reclosing (AR) cycle.
The absence of electronic components and electrolytic capacitors significantly extends the service life of the VB4-P circuit breaker.
The control circuit design enables integrity monitoring of closing and tripping circuits with direct supervision of the closing and tripping electromagnets.
The circuit breaker provides simple and convenient access to the operating mechanism components and auxiliary contacts.

Parameter	Unit	Value
Rated voltage	kV	35
Highest permissible operating voltage	kV	40.5
Rated normal current	A	630 / 1250 / 1600 / 2000 / 2500
Rated short-circuit breaking current (Isc)	kA	20 / 25 / 31.5
Rated short-time withstand current (3 s)	kA	20 / 25 / 31.5
Rated short-circuit making current (Ip)	kA (peak)	50 / 80
Rated voltage of secondary circuits	V	As per project
Closing time	s	0.1
Opening time	s	0.05
Spring charging time	s	15
Contact operating simultaneity (max. difference) – closing	s	≤ 0.001
Contact operating simultaneity (max. difference) – opening	s	≤ 0.001
Rated operating duty	—	O – 0.3 s – CO – 180 s – CO*
Pole center distance	mm	700
Degree of protection	—	IP55
Overall dimensions (W × D × H)	mm	1954 × 660 × 1965
Weight	kg	700