Siemens 3VA1 100 A Manual page 20

Description
2.1 Overview - applications and portfolio
Compact dimensions with function expansions
In addition to its expanded functionality, the 3VA2 molded case circuit breaker also comes
with compact dimensions for fixed mounting, as a plug-in version and a draw-out version.
A cover size of 70 mm for the door cutout and a complete selection of breaking capacity
classes from 55 kA to 150 kA at 415 V AC provide the necessary flexibility for planning.
Despite its compact size, the circuit breaker offers the following benefits:
● Extremely high breaking capacity
● Extremely good selectivity
● Electronic trip units, versions with and without integrated metering function and optional
fieldbus communication interface
Selective contact system
With its contact system, the 3VA2 molded case circuit breaker is designed for fast selectivity
tripping. The selective contact system ensures the following:
● Dynamic instantaneous short-circuit range
● High breaking capacity
● Selective protection response of the molded case circuit breakers in relation to each other
● Selective protection response of the molded case circuit breakers in relation to other
protection devices such as downstream low-voltage fuses, etc.
Electronic Trip Unit (ETU)
The current sensor of the 3VA2 comprises an iron-cored transformer for the internal power
supply and a Rogowski coil for precise current measurement. Each transformer can be
optimized accordingly for its specific task. Thanks to the high accuracy of current
measurement, the 3VA2 molded case circuit breaker is suitable for power/energy
measurement. In addition, finer adjustment of ground fault current monitoring is possible.
The Electronic Trip Units (ETUs) provide the following protection functions:
● Overload protection L ("L" = Long-time delay)
Adjustable in steps from 40% to 100% of the rated operational current of the molded case
circuit breaker.
● Short-time delayed short-circuit protection S ("S" = Short-time delay) for time-selective
response in case of a short circuit
● Instantaneous short-circuit protection I ("I" = instantaneous):
● Protection of the neutral conductor against overload and short-circuit ("N" = neutral)
● Protection against residual currents to ground ("G" = Ground fault).
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3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02