▸ Product Introduction

Model meaning

Z: vacuum arc extinguishing

N: indoor installation

23: Design serial number

12: Rated voltage (kV)

Functional localization

Full current interruption: reliably interrupt rated current, overload current and short circuit current (up to 31.5kA).

Fast protection: the opening time is less than ≤50ms, and the fault cutting speed is better than the traditional model.

Typical application

Inlet/outlet of 12kV distribution system, distribution room of industrial and mining enterprises, box-type substation (adapted to XGN15-12, KYN28A-12 and other switchgear).

Operation accessory configuration

Operating power supply: DC 110V/220V or AC 220V V.

Auxiliary contact: 6 normally open+6 normally closed (including energy storage/on/off indication)

Locking function

It is forbidden to push/pull the handcart in the closing state.

The earthing switch is mechanically interlocked with the circuit breaker.

Type selection verification formula

Thermal stability check: I infty} 2 CDOTT LEQ I _ {th} 2 CDOT4I ∞ 2t ≤ ITH24 (fault thermal effect ≤ circuit breaker tolerance).

Altitude correction: when it is more than 1000m, the capacity will be reduced by 1% per 100m rated current.

Ambient temperature: -30℃-+40℃ (special design is required if it exceeds the range).

Critical threshold

Break-brake speed is 1.1 0.1 m/s (if the speed drops by more than 15%, it needs maintenance).

Contact overtravel is 3 0.5 mm (< 2.5 mm, the arcing chamber must be replaced).

Periodic maintenance

3 years /5000 operations:

Main circuit resistance measurement (standard: ≤ 40μ ω @ 1250a)

Mechanism lubrication (special low temperature grease)

Forced replacement of arc extinguishing chamber

Cumulative breaking short-circuit current reaches 300% Isc (for example, 25kA cumulative breaking 75kA).

Used for 10 years (even if the parameters are normal)

Iron law of safe operation

Five-proof interlock must be intact!

After breaking the brake, you must wait for ≥15s before operating the handcart (to ensure that the arc is completely extinguished).