Armored Withdrawable Metal-Enclosed Switchgear KYN28-12 - Product

Overview:

The KYN28-12 indoor AC armored withdrawable metal-enclosed switchgear is designed for three-phase AC systems with a rated voltage of 12kV and a rated frequency of 50Hz. It is used for receiving and distributing electrical energy and for controlling, protecting, and monitoring circuits.

Operating Conditions:

Ambient temperature: Maximum +40°C, minimum -15°C (can reach -45°C with special processes);
Ambient humidity: Daily average <95%, monthly average ≤90%;
Altitude: Below 1000 meters;
Earthquake resistance: Seismic intensity not exceeding 8 degrees;
The surrounding air should be free from corrosive or flammable gases, water vapor, and significant pollution;
Suitable for locations without severe pollution and frequent intense vibration, designed to meet Class 1 requirements under harsh conditions;
For use in conditions exceeding the normal environmental conditions specified in GB3906, users should consult with the manufacturer.

Notes:

When the relative humidity exceeds 70%, the electric heater should be turned on.
For areas with an altitude exceeding 1000 meters, refer to JB/Z102-71 for appropriate handling.

Item	Unit	Parameter
Rated Voltage	kV	3.6 / 7.2 / 12
Rated Frequency	Hz	50
Circuit Breaker Rated Current	A	630, 1250, 1600, 2000, 2500, 3150
Switchgear Rated Current	A	630, 1250, 1600, 2000, 2500, 3150
Rated Dynamic Stability Current (4s)	kA	16, 20, 25, 31.5, 40, 50
Rated Stability Current (Peak)	kA	40, 50, 63, 80, 100, 125
Rated Short-Circuit Breaking Current	kA	16, 20, 25, 31.5, 40, 50
Rated Short-Circuit Making Current (Peak)	kA	40, 50, 63, 80, 100, 125
Rated Insulation Level
1-Minute Power Frequency Withstand Voltage	kV	24, 32, 42
Lightning Impulse Withstand Voltage	kV	40, 60, 75
Protection Level		IP4X (enclosure), IP2X (when isolation compartment and circuit breaker room doors are open)