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Medium-Voltage Metal-Clad Switchgear

Type GM38 (38 kV)

Technical Data

Type 38-3AH3 Circuit Breaker Ratings

Measured Parameter

Units

Circuit Breaker Type 38-3AH3-1500 [1]

Circuit Breaker Type 38-3AH3-31 [2]

Circuit Breaker Type 38-3AH3-40 [2]

General

Nominal Voltage Class

kV

38.0

38.0

38.0

General

Nominal Three-Phase MVA Class

MVA

1,500

----

----

Rated Values

Rated Voltage

Maximum Design Voltage (V)

kV rms

38.0

38.0

38.0

Rated Values

Rated Voltage

Voltage Range Factor (K)

----

1.65

1.0

1.0

Rated Values

Insulation Levels

Withstand Voltage Levels Power Frequency

kV rms

80

80

80

Rated Values

Insulation Levels

Withstand Voltage Levels Lightning Impulse (BIL)

kV peak

150

150

150

Rated Values

Rated Current

Continuous

A rms

1,200, 2,000, 3,000FC [3]

1,200, 2,000, 3,000FC [3]

1,200, 2,000, 3,000FC [3]

Rated Values

Rated Current

Short-Circuit (At Rated Maximum Design Voltage) (I)

kA rms sym

21

31.5

40

Rated Values

Rated Current

Interrupting Time

Cycles/ms

5/83 [8]

5/83 [8]

5/83 [8]

Rated Values

Rated Current

Permissible Tripping Delay (Y)

Sec

2

2

2

Related Required Capabilities

Current

Rated Maximum Design Voltage (V) Divided by K = (V/K)

kA rms

23.0

38.0

38.0

Related Required Capabilities

Current

Maximum Symmetrical (sym)Interrupting (K X I)

kA rms sym

35

31.5

31.5

Related Required Capabilities

Current

Short-Time Current (K x I) (Three Seconds)

kA rms sym

35

31.5

40

Related Required Capabilities

Closing and Latching(Momentary)

Asymmetrical

kA rms

56 [4]

50 [6]

62 [6]

Related Required Capabilities

Closing and Latching(Momentary)

Peak

kA peak

95 [5]

85 [7]

104 [7]

Footnotes:
[1] Historic constant MVA class (ANSI C37.07-1987)
[2] New constant kA class (ANSI C37.06-2000)
[3] Fan-cooled
[4] 1.6 x K x I
[5] 2.7 x K x I
[6] 1.55 x I
[7] 2.60 x I
[8] Three-cycle (50 ms) interrupting optional.


Type 38-3AH3 Vacuum Circuit Breaker

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