ABB CO-9
Manuals and User Guides for ABB CO-9. We found 1 manuals for free downloads User manual
ABB CO-9 is a single-phase, non-directional time overcurrent relay used for sensing current levels above a set point. It's ideal for applications requiring coordination with fuses, reclosers, cold load pickup, motor starting, or fixed-time operations. The CO-9 relay offers very inverse time characteristics for reliable protection against overcurrents, particularly in scenarios involving transformer inrush or motor protection with limited locked rotor time.
Key Features
- Single-Phase
- Non-Directional
- Very Inverse Time
- Coordination with Fuses/Reclosers
- Cold Load Pickup
- Motor Starting
- Transformer Inrush
Pages: 32 ABB CO-9 User manual
Brand: ABB Category: Electrical relays Size: 1 MB
Languages: English
Open manualFrequently Answers and Questions
What type of time curve does the CO-9 relay have?
The CO-9 relay has a very inverse time curve, which means the tripping time decreases rapidly as the current increases.
What are some common applications for the CO-9 relay?
Common uses include motor protection with limited locked rotor time, overcurrent protection with coordination with fuses and reclosers, and handling cold load pickup inrush.
How does the CO-9 relay coordinate with other devices?
The relay's very inverse time curve allows it to coordinate with downstream protective devices, ensuring selective tripping in case of a fault.
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