Description
CKG3 12kV AC Vacuum Contactor Overview
The CKG3 series is a 12 kV AC vacuum contactor range with published rated-current options of 160 A, 250 A, 400 A, and 630 A. It is intended for repeated switching duties in medium-voltage circuits, including motor control, transformer switching, and capacitor-bank switching.
The current rating must be selected together with the required short-time and peak withstand values. Installation altitude and environmental conditions also affect whether the ordinary or plateau configuration is appropriate.
Operating Conditions
- Ambient air temperature: -10°C to 40°C
- Maximum installation altitude: 1,000 m for the ordinary type; 4,000 m for the plateau type
- Maximum monthly average relative humidity in the wettest month: 90%
- Reference monthly average minimum temperature for the wettest month: 25°C
- Condensation caused by temperature and humidity changes must be considered
- No obvious shaking or impact vibration
- No explosion hazard or gas and dust sufficient to corrode insulation
- Installation location protected from rain and snow
Electrical Ratings
| Parameter | Published value |
|---|---|
| Rated working voltage (Ue) | 12 kV |
| Rated working current (Ie) | 160 A / 250 A / 400 A / 630 A |
| Power-frequency withstand voltage | 42 kV |
| Lightning impulse withstand voltage | 75 kV |
| Rated breaking capacity | 8 Ie, 25 operations |
| Rated closing capacity | 10 Ie, 100 operations |
| Rated short-time withstand current | 10 Ie: 1.6 kA / 2.5 kA / 4 kA / 6.3 kA |
| Rated peak withstand current | 25 Ie: 4 kA / 6.3 kA / 10 kA / 16 kA |
| Overload withstand current | 15 Ie: 2.4 kA / 3.8 kA / 6 kA / 10 kA |
| Short-circuit making and breaking sequence | 10 Ie: O–180 s–CO–180 s–CO, 1 time |
Mechanical and Service Data
| Parameter | Published value |
|---|---|
| Rated contact distance | 5.5 ± 0.5 mm |
| Overtravel | ≥ 1.5 mm |
| Closing synchronization | ≤ 2 ms |
| Mechanical life | 500,000 operations |
| Electrical life, AC-3 | 250,000 operations |
| Electrical life, AC-4 | 100,000 operations |
Application and Selection
The published application information covers frequent switching of AC motors, transformers, capacitor banks, and related power-distribution loads. Confirm the utilization category, operating sequence, current rating, control arrangement, installation altitude, and environmental conditions for the intended switchgear system.
Information for an Inquiry
Provide the system voltage, rated current, load type, utilization category, expected switching frequency, control voltage, installation altitude, and ambient conditions so the requested CKG3 configuration can be compared with the published ratings.
FAQ
Which current ratings are listed for the CKG3 12kV contactor?
What insulation withstand values are specified?
What installation altitude is allowed?
What mechanical and electrical life values are published?
What information is needed for CKG3 selection?
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.