Core cabinets cannot go down; a single circuit is a single point of failure.
1. Risk
One compressor/fan failure loses cooling; temperature spikes fast.
2. Solution
Two independent circuits auto-switch as backup.
3. Use cases
Core telecom, power hubs, unattended sites, data centers.
| Design | Reliability |
|---|---|
| Single | basic |
| Dual N+1 | no downtime |
| Twin units | cabinet-level |
HCK dual-circuit custom keeps cooling through any single failure.