
The full form of an ONAN transformer is Oil Natural Air Natural. Natural circulation of oil
DEMIKS stands as the foremost manufacturer in China for high-grade AC Metal Ring Network Switchgear, also known as Vacuum Switch. For any electrical solutions, we provide the most dependable answers. Get in touch with us for further inquiry!
Purpose and Use: For metropolitan electric grids, dealing with loads and short-circuit currents.
Switch Mechanism: Includes FZRN25/FZRN21 vacuum load switches; manual or electric control.
Compact and Safe: Minimal in size and weight, explosion proof, preserves “five precautions” safety reliability.
Standards Compliance: Conforms to GB3906 and IEC60420 specs.
Environmental Adaptability: Functional from -15°C to +40°C, below 1000 meters, and daily humidity less than 95%.
Seismic and Pollution Resistance: Earthquake resilience up to 8 on the scale and in non-polluted environments.
| Project | Unit | FKN12-12 | FZN25-12 |
|---|---|---|---|
| Rated Voltage | kV | 12 | |
| Power Frequency Withstand Voltage | Earth and phase: 42; Isolation fracture: 48 | Earth and phase: 42; Isolation fracture: 48 | |
| Lightning Impulse Voltage (Peak) | Ground and phase: 75; Isolation fracture: 85 | Ground and phase: 75; Isolation fracture: 85 | |
| Rated Frequency | Hz | 50 | 50 |
| Main Busbar Rated Current | A | 630 | 630 |
| Load Switch Specifications | |||
| Specification | Unit | FKN12-12 | FZN25-12 |
| Rated Current | A | 630 | 630 |
| Rated Current Life | Times | Not less than 100 | Not less than 100 |
| Breaking Capacity of No-Load Transformer | kVA | 1250 | 1250 |
| Rated Thermal Stable Current | kA/s | 20/4; Grounding switch: 20/2 | 20/4; Grounding switch: 20/2 |
| Rated Dynamic Current (Peak) | kA | 50 | 50 |
| Rated Short Circuit Closing Current (Peak) | kA | 50 | 50 |
| Fuse Rated Current | kV | 100 | 100 |
| Rated Transfer Current | A | 1500 | 2000 |
| Rated Short-Circuit Breaking Current | kA | 315 | 315 |
| With Fuse Type | SOLAJ-12 (XRNTO-10) | SOLAJ-12 (XRNTO-10) |
Correctly managing electrical systems require an understanding of the difference between Ring Main Units (RMUs) and switchgear as both have their importance in protection and distribution of power. The two devices differ in application, configuration, and operation.

The full form of an ONAN transformer is Oil Natural Air Natural. Natural circulation of oil

Shanghai Demiks Power Technology Delivers High-Voltage Test Equipment & On-Site After-Sales Service for Zhuhai Kangjin Laboratory

ONAN versus ONAF refers to the external airflow. ONAN means Oil Natural Air Natural: oil circulates
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