SIEMENS 3AH3 vacuum circuit breaker

Environmental conditions and technical parameters

1. Environmental conditions (compliant with IEC 60721-3-3)

Key limitations of environmental category level

The lower limit of low temperature in the 3K4 climate environment is -5 ℃, with no icing or wind blown precipitation

Biological Environment 3B1-

Mechanical environment 3M2-

Chemical active substance 3C2-

Mechanical active substance 3S2 requires cleaning of insulation components

2. Current carrying capacity and insulation strength

Current carrying capacity: The rated normal current is based on an ambient air temperature of 40 ℃ (open type switchgear), and can be increased when the temperature is below 40 ℃. The rated current levels include 1250A, 2000A, 2500A, 3150A, 4000A, 5000A, and 6300A (corresponding to characteristic curves 1-7).

Insulation strength:

Reference conditions: At an altitude of 1000m (above sea level), the rated lightning impulse withstand voltage and rated short-time power frequency withstand voltage are taken according to the "Technical Data" section.

High altitude correction: When the altitude is greater than 1000m, it needs to be adjusted according to the formula U ≥ U 0 × K a (U is the reference environmental withstand voltage, U 0 is the required withstand voltage of the installation site, K a is the altitude correction factor, which increases with altitude).

Example: When a lightning impulse withstand voltage of 75kV is required at an altitude of 2500m, the reference environment must be at least 90kV (90kV ≥ 75kV × 1.2).

3. Capacitor switch capability (endurance class C2, IEC 62271-100) Rated voltage U r (kV) Rated line charging breaking current I I (A, r.m.s.) Rated cable charging breaking current I c (A, r.m.s.) Rated single capacitor group breaking current I sb (A, r.m.s.) Rated back-to-back capacitor group breaking current I bb (A, r.m.s.) Inrush current frequency f bl (Hz)

7.2 10 10 400 400 4250

12 10 25 400 400 4250

17.5 10 31.5 400 400 4250

24 10 31.5 400 400 4250

36 10 50 400 400 4250

40.5 10 50 400 400 4250

Note: The capacity of the circuit breaker capacitor switch is 0.7 × I r of the standard specification

Selection and Configuration Guide

1. Order number structure (16 digits)

Explanation of Position Meaning

1-3 superior group/main group/sub group 1: switchgear; 2: Circuit breaker; 3 digits: Circuit breaker series

The 4-8 bit main device includes design and main device parameters (voltage, current, pole spacing, etc.)

9-16 position secondary equipment operating mechanism, release, operating voltage, auxiliary equipment, etc

Order code supplementary configuration 9/Equipment version marked with "Z" digit, supplemented with 3-digit code (a n a format), can be continuously added multiple times

Add "- Z" to the order number for special version customization requirements, followed by descriptive code; Y99 is used for unspecified special requirements and needs to be negotiated with Siemens

2. Selection of main equipment (by voltage level)

Taking some key voltage levels as examples, demonstrate the adaptation relationship between rated short-circuit breaking current and rated normal current (excerpt):

Rated voltage (kV) Rated short-circuit breaking current (kA) Rated normal current (A) - Pole distance (mm) Adaptation

7.2 50 1250(210)、2500(210/275)、4000(275/350)

7.2 63 2000(275)、3150(275)、4000(275/350)

12 50 1250(210)、2500(210/275)、4000(275/350)

12 63 2000(275)、3150(275)、4000(275/350)

36 31.5 1250(350)、2500(350)、4000(350)

36 40 3150(350)、4000(350)

Note: "n" indicates that the combination is optional

3. Selection of secondary equipment (core configuration)

Description of optional scope of configuration items

Operating mechanism electric (excluding hand crank), manual (including hand crank) Hand crank can be ordered separately as accessories

Closing method: Solenoid+manual mechanical closing, manual electric closing. Manual electric closing can be adapted to switch equipment interlocking to prevent accidental closing

Up to 3 release combinations can be used (based on 1 shunt release, additional shunt/CT operation/undervoltage release can be added). Please refer to page 19 of the document for specific combinations

Auxiliary switches 6NO+6NC, 12NO+12NC-

Plug/Terminal: 24 pole terminal block, 24 pole plug, 64 pole plug. The interface of the 64 pole plug can be connected to idle auxiliary contacts by the user

Interlock free, mechanical interlock, mechanical interlock adapted to circuit breaker handcart, withdrawal component or isolation switch

4. Additional equipment (some key options)

Additional equipment function order code

Anti condensation heating 230V AC, 50W, anti condensation Z A30

Silicon free design suitable for special environmental requirements Z A31

Low temperature adaptation (-25 ℃) can operate Z A40 in an environment of -25 ℃

3AH37 horizontal installation (≥ 5000A) 3AH37 model 5000A and above horizontal installation supplement Z A70

Gold plated auxiliary switch enhances contact reliability and adapts to different interfaces Z A17/Z A18/Z A20/Z A21

Routine test certificate with seal and report/report only/with seal signature Z F19/Z F20/Z F21

Accessories and after-sales support