PRODUCT / 01 / Ring Main Units
12 kV Dry Air Insulated Ring Main Unit XDA-12(V)/630-20
SF6-free 12 kV ring main unit using dry air insulation, rated 630 A with 20 kA short-circuit breaking capacity. The source description states a type-tested design; request the model-specific report and scope before relying on that claim.
Standards referenced for project review, not evidence of product certification:
- IEC 62271-200
- IEC 62271-100
- IEC 62271-1
- Rated voltage
- 12 kV
- Peak withstand current
- 50 kA peak
- Rated operating sequence
- O-0.3s-CO-180s-CO
- Rated current / frequency
- 630 A / 50 Hz
- Short-circuit making current
- 50 kA peak
- Short-circuit breaking current
- 20 kA
ENGINEERING VIEW
RMU rating snapshot
A visual summary of published source data. It does not replace the full technical schedule or project confirmation.
- Rated voltage
- 12 kV
- Rated current / frequency
- 630 A / 50 Hz
- Breaking current
- 20 kA
Product description
SF6-free 12 kV ring main unit using dry air insulation, rated 630 A with 20 kA short-circuit breaking capacity and a type-tested design.
Features
- Dry air insulation — no SF6, no F-gas
- 20 kA short-circuit breaking current
- Source description states a type-tested design; request the model-specific report and scope.
- Three-position switch and vacuum circuit breaker
- Compact cubicle construction
- Rated operating sequence O-0.3s-CO-180s-CO
Technical parameters
| Parameter | Value |
|---|---|
| Rated voltage | 12 kV |
| Peak withstand current | 50 kA peak |
| Rated operating sequence | O-0.3s-CO-180s-CO |
| Rated current / frequency | 630 A / 50 Hz |
| Short-circuit making current | 50 kA peak |
| Short-circuit breaking current | 20 kA |
| Closing / opening control voltage | AC 220 V (187–242 V) |
| Power-frequency withstand voltage | 42 kV |
| Lightning impulse withstand voltage | 75 kV peak |
| Short-time withstand current / duration | 20 kA / 4 s |
| Dry air filling pressure at 20°C (gauge) | 0.02 MPa |
| Across isolating distance: power frequency | 48 kV |
| Across isolating distance: lightning impulse | 85 kV peak |
| Minimum functional pressure at 20°C (gauge) | 0.01 MPa |
Parameters are taken from the manufacturer product sheet. Final ratings are confirmed against the project specification before order.
Documented application contexts
These links show the evidence basis currently associated with this product. They are starting points for engineering review, not project references or recommendations.
Frequently asked questions
What is the rated configuration?
This product sheet covers the XDA-12(V)/630-20 model: 12 kV, 630 A, 50 Hz, with 20 kA short-circuit breaking current and SF6-free dry-air insulation.
Which standards apply?
Review IEC 62271-200, IEC 62271-100, IEC 62271-1 as applicable references. The exact standard scope and supporting test evidence must be confirmed for the quoted configuration.
Is type-test evidence available?
No model-specific type-test report is published here. Request the report number, issuing laboratory, test scope and applicability to the quoted configuration.
Can the RMU configuration be adapted?
Send the required incoming and outgoing circuits, protection, control, metering and communication requirements. The final arrangement is confirmed against the project specification.
NEXT STEP
Specify the equipment.
Voltage class, rated current, short-circuit level, installation environment and the standards your project is tendered against.