ARMC — Metal Clad Switchgear
Metal clad medium-voltage switchgear with earthed metal partitions, withdrawable vacuum circuit breaker and IP4X protection. Incoming, outgoing, coupling and metering cells.
The ARMC series consists of five main compartments separated by metal partitions: low voltage, circuit breaker, busbar, voltage transformer and cable. Movable shutters and insulated transitions are used at interfaces to ensure operational continuity. The breaker compartment accepts a withdrawable vacuum circuit breaker, disconnector or fused voltage transformer combination.
Component options include Schneider Electric, ABB, Siemens or the factory's own devices, depending on customer specification. Internal arc classification IAC AFLR (all-side access), withstand 31.5 kA/1 s.
Technical Specifications
| Parameter | MC12A | MC24A | MC36A | MC40A |
|---|---|---|---|---|
| Rated voltage | 12 kV | 24 kV | 36 kV | 40.5 kV |
| Power frequency withstand voltage | 28 kV | 50 kV | 70 kV | 80 kV |
| Lightning impulse withstand voltage 1.2/50 µs | 75 kV | 125 kV | 170 kV | 200 kV |
| Short-time withstand current | 31.5 kA / 1–3 s | 31.5 kA / 1–3 s | 31.5 kA / 1–3 s | 25 kA / 1 s |
| Internal arc withstand current | 31.5 kA / 1 s | 31.5 kA / 1 s | 31.5 kA / 1 s | 25 kA / 1 s |
| Internal arc classification | IAC AFLR | IAC AFLR | IAC AFLR | IAC AFLR |
| Degree of protection | IP4X | IP4X | IP4X | IP4X |
| Component options | Schneider Electric, ABB, Siemens, factory-made devices | |||
