The air filtration device consists of a housing, filter materials and other components. When a pressure difference occurs between the inside and outside of the sealed enclosure, air exchange takes place through this device. Meanwhile, it can effectively block dust, salt spray and other solid particulates from entering the sealed enclosure.

Available tripping coil options include conventional tripping coils, low power tripping coils (for self powered protection relays), and under voltage trip coils. Only conventional closing coils are available. For the manual charge operating mechanism, up to two tripping coils can be fitted. Closing coils are normally not supplied, though one closing coil may be optionally fitted. For the electric charge operating mechanism, two tripping coils and one closing coil can be selected.

Excluding the secondary top compartment, the minimum height of the 24 kV switchgear is 1700 mm. This height imposes considerable constraints on the installation of CTs and busbar PTs. It is recommended to select 1 A for the CT secondary current. Please consult us for detailed accuracy class and burden parameters. If busbar PTs are adopted, please consult us on the installation arrangement.

Pressure relief vents are fitted as standard across all cabinet types. The IAC internal arc classification is AFLR 20 kA/1 s, 25 kA/1 s and 31.5 kA/0.5 s.

This product is widely used across sectors including power, energy, scientific research, aerospace, municipal utilities, transportation, commercial & residential buildings, as well as industrial and mining sites. It has decades of field operation experience under various extreme environmental conditions, such as heavy sand dust conditions, high salt spray, high temperature and high humidity.

For outdoor RMU, a wide range of outdoor enclosure options are available, with stainless steel and SMC constructions. Various designs are also offered. Depending on the characteristics of different surroundings, custom decorative finishes can be applied to the enclosures so they blend in with the environment.

The cable bushings are designed according to EN 50181 Type C. Matching European type separable cable accessories shall be adopted.

ASNA switchgear has roughly the similar footprint as traditional gas insulated cubicles and can serve as a direct replacement for original switchgear. Furthermore, the circuit breaker based ASNA switchgear is better suited to the requirements of smart distribution grids. It enables local fault isolation and improves distribution network reliability.

We recommend circuit breakers as a replacement for standalone load switches. Load switches are only capable of making and breaking normal load currents and cannot interrupt short circuit currents. Circuit breakers can perform both load current switching and short circuit current interruption, offering superior line protection. To replace load switch fuse combinations, we deploy switchgear equipped with self powered protection relays. This design delivers stable breaking performance, enables selective protection, and allows repeated switching cycles without consumable part replacement.

The sealed enclosure allows slow moisture exchange with outside air via breath holes. Under extreme conditions, the anti condensation coating at the top directs condensate down the enclosure walls to the bottom drain, preventing contact with live parts. Supported by field disassembly inspections and 16 years of field experience, no condensation related failures have occurred. The equipment delivers safe and reliable performance. Please see the white paper for full details.

ASNA RMU/Switchgear is compliant with relevant IEC standards and has successfully undergone laboratory testing by KEMA

Dacromet is an advanced metal surface treatment technology with extensive application in the automotive sector. Parts processed by Dacromet exhibit outstanding corrosion resistance. Key properties of the process include high penetration, high adhesion, favourable anti friction performance, superior weather resistance, high chemical stability and pollution free features. All fasteners on ASNA switchgears are Dacromet treated, offering better environmental adaptability and improving overall equipment durability.