HV Breaker - Short Circuit Tab

Option Descriptions
ANSI
Max kV	Maximum voltage for which the breaker is designed and the upper limit for operation.
Rated kA @ Max kV	Rated interrupting kA of the breaker at the breaker’s maximum voltage.
Interrupting (kA)	Interrupting rating of the breaker.
Close & Latch (kA)	Close & latch rating of the breaker.
K-factor	Ratio of rated maximum voltage to the lower limit of the range of operating voltage in which the required symmetrical and asymmetrical interrupting capabilities vary in inverse proportion to the operating voltage.
Cycles	Interrupting time of the breaker in cycles.
IEC
Rated kV	The rated voltage is equal to the maximum system voltage for which the equipment is designed.
Breaking kA	The breaking current is the highest short circuit current which the circuit breaker is capable of breaking.
Making kA	The making current is the highest prospective peak current which the circuit breaker is capable of making. It is 2.5 times (50 Hz) or 2.6 times (60 Hz) the value of the rated short circuit breaking current.
Opening Times (s)	Opening time of a circuit breaker defined according to the tripping method as stated below and with any time delay device forming an integral part of the circuit breaker adjusted to its minimum setting: For a circuit-breaker tripped by any form of auxiliary power, the opening time is the interval of time between the instant of energizing the opening release, the circuit-breaker being in the closed position, and the instant when the arcing contacts have separated in all poles. For a self-tripping circuit breaker, the opening time is the interval of time between the instant at which, the circuit-breaker being in the closed position, the current in the main circuit reaches the operating value of the overcurrent release, and the instant when the arcing contacts have separated in all poles.
DC Time Const (s)	The DC component of a short circuit decays exponentially with a time constant in seconds which depends on the frequency and X/R ratio.
Both
Testing Standard	The data in the library for the breaker is applicable for the specified test standard. The following testing standards are defined: ANSI-TOTAL: The interrupting and momentary close & latch ratings are both in asymmetrical kA (total rms kA). Circuit breakers prior to 1964 used this test standard. ANSI-SYM: The interrupting rating is in symmetrical kA whereas the momentary close & latch rating is in asymmetrical kA (total rms kA). ANSI-Crest: The interrupting rating is in symmetrical kA whereas the momentary close & latch rating is in peak kA. IEC: The circuit breaker ratings are as per IEC test standard.
Calculate	Fills in computed values based on the device library entry for Mfr, Type, Style and the base kV. You can override these values by typing in different numbers.

Max kV

Maximum voltage for which the breaker is designed and the upper limit for operation.

Rated kA @ Max kV

Rated interrupting kA of the breaker at the breaker’s maximum voltage.

Interrupting (kA)

Interrupting rating of the breaker.

Close & Latch (kA)

Close & latch rating of the breaker.

K-factor

Ratio of rated maximum voltage to the lower limit of the range of operating voltage in which the required symmetrical and asymmetrical interrupting capabilities vary in inverse proportion to the operating voltage.

Cycles

Interrupting time of the breaker in cycles.

IEC

Rated kV

The rated voltage is equal to the maximum system voltage for which the equipment is designed.

Breaking kA

The breaking current is the highest short circuit current which the circuit breaker is capable of breaking.

Making kA

The making current is the highest prospective peak current which the circuit breaker is capable of making. It is 2.5 times (50 Hz) or 2.6 times (60 Hz) the value of the rated short circuit breaking current.

Opening Times (s)

Opening time of a circuit breaker defined according to the tripping method as stated below and with any time delay device forming an integral part of the circuit breaker adjusted to its minimum setting:

For a circuit-breaker tripped by any form of auxiliary power, the opening time is the interval of time between the instant of energizing the opening release, the circuit-breaker being in the closed position, and the instant when the arcing contacts have separated in all poles.
For a self-tripping circuit breaker, the opening time is the interval of time between the instant at which, the circuit-breaker being in the closed position, the current in the main circuit reaches the operating value of the overcurrent release, and the instant when the arcing contacts have separated in all poles.

DC Time Const (s)

The DC component of a short circuit decays exponentially with a time constant in seconds which depends on the frequency and X/R ratio.

Both

Testing Standard

The data in the library for the breaker is applicable for the specified test standard. The following testing standards are defined:

ANSI-TOTAL: The interrupting and momentary close & latch ratings are both in asymmetrical kA (total rms kA). Circuit breakers prior to 1964 used this test standard.
ANSI-SYM: The interrupting rating is in symmetrical kA whereas the momentary close & latch rating is in asymmetrical kA (total rms kA).
ANSI-Crest: The interrupting rating is in symmetrical kA whereas the momentary close & latch rating is in peak kA.
IEC: The circuit breaker ratings are as per IEC test standard.

Calculate

Fills in computed values based on the device library entry for Mfr, Type, Style and the base kV. You can override these values by typing in different numbers.

ANSI
Option	Description
Max kV	Maximum voltage for which the breaker is designed and the upper limit for operation.
Rated kA @ Max kV	Rated interrupting kA of the breaker at the breaker’s maximum voltage.
Interrupting (kA)	Interrupting rating of the breaker.
Close & Latch (kA)	Close & latch rating of the breaker.
K-factor	Ratio of rated maximum voltage to the lower limit of the range of operating voltage in which the required symmetrical and asymmetrical interrupting capabilities vary in inverse proportion to the operating voltage.
Cycles	Interrupting time of the breaker in cycles.
IEC
Rated kV	The rated voltage is equal to the maximum system voltage for which the equipment is designed.
Breaking kA	The breaking current is the highest short circuit current which the circuit breaker is capable of breaking.
Making kA	The making current is the highest prospective peak current which the circuit breaker is capable of making. It is 2.5 times (50 Hz) or 2.6 times (60 Hz) the value of the rated short circuit breaking current.
Opening Times (s)	Opening time of a circuit breaker defined according to the tripping method as stated below and with any time delay device forming an integral part of the circuit breaker adjusted to its minimum setting: For a circuit-breaker tripped by any form of auxiliary power, the opening time is the interval of time between the instant of energizing the opening release, the circuit-breaker being in the closed position, and the instant when the arcing contacts have separated in all poles. For a self-tripping circuit breaker, the opening time is the interval of time between the instant at which, the circuit-breaker being in the closed position, the current in the main circuit reaches the operating value of the overcurrent release, and the instant when the arcing contacts have separated in all poles.
DC Time Const (s)	The DC component of a short circuit decays exponentially with a time constant in seconds which depends on the frequency and X/R ratio.
Both
Testing Standard	The data in the library for the breaker is applicable for the specified test standard. The following testing standards are defined: ANSI-TOTAL: The interrupting and momentary close & latch ratings are both in asymmetrical kA (total rms kA). Circuit breakers prior to 1964 used this test standard. ANSI-SYM: The interrupting rating is in symmetrical kA whereas the momentary close & latch rating is in asymmetrical kA (total rms kA). ANSI-Crest: The interrupting rating is in symmetrical kA whereas the momentary close & latch rating is in peak kA. IEC: The circuit breaker ratings are as per IEC test standard.
Calculate	Fills in computed values based on the device library entry for Mfr, Type, Style and the base kV. You can override these values by typing in different numbers.

HV Breaker - Short Circuit Tab

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