Features:
- Compares two 100/125 V AC measuring systems at 50 or 60 Hz.
- Responds within the specified 18–24 V difference range.
- Uses a flush 7XP2020-2L housing with rear terminals.
The CA00 execution identifies the panel arrangement and terminal direction required for this relay. Measuring voltage and housing details must match the original protection drawing.
Rather than measuring absolute voltage for display, the relay evaluates the relationship between two sources and transfers that result to protection or switching logic through its contacts.
Commissioning should verify polarity, phase association, pickup, reset and the complete downstream trip or permissive path. Panel sealing must also preserve the declared front protection level.
Legacy 7RE2800-0CA00 supply is reviewed against the complete relay and case identity.
Verified resources for Siemens 7RE2800-0CA00:
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Supervise paired bus-voltage circuits before transfer logic is enabled.
- Detect an unacceptable difference between synchronizing voltage sources.
- Maintain established electromechanical protection panels that use rear-connected relay cases.
- The relay continuously compares the two connected measuring-voltage systems.
- A difference inside the response band initiates the assigned contact action.
- Pickup and reset values should be recorded during periodic protection testing.
- Treat every VT secondary terminal as live until isolated, proved and grounded where required.
- Use the approved test-block sequence so the protection circuit is not unintentionally opened.
- Secure associated switching equipment before injecting test quantities.
- Contact loading must remain within the documented 250 V and 2 A continuous limits.
- The installed case and panel arrangement must preserve the specified IP51 front protection.
- Protection test records should follow the site's relay-maintenance standard.