Customer circuit breakers

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The following table shows the maximum circuit breaker ratings based on input voltage.

Table 1. Circuit breaker ratings based on input voltage - PDU
Line-Line Nominal Input Voltage Range (V) System Rated Current (A) Circuit Breaker
200 - 240 V AC 48A 60/63A
380 - 415 V AC 24A 32/30A

It is recommended, for simplicity and ease of upgrades, that the circuit breaker ratings in this table be used on all power cords for all installations. The actual power drawn (heat load) by any configuration will not be affected.

Note: Small currents can appear on the server earth ground connection under normal server operation.

For most reliable operation, circuit breakers that react to currents detected on ground (e.g. Earth Leakage Circuit Breakers or Residual Current Circuit Breakers) are not recommended for use with 9176. By internal design and grounding, 9176 is fully certified for safe operation without them (meets IEC, EN, UL, CSA 60950-1 and 62368-1 standards).

However, if leakage detection circuit breakers are required by local electrical practice, they can be used up to 100 mA. To safeguard against spurious tripping:

  1. The Data Center ground grid should be constructed in accordance with best practices to avoid significant voltage gradients.
  2. The facility power infrastructure should be as reliable as possible.
  3. The utility connections from the breaker panel to the two or four power cord inputs should be reasonably equal in length or at least no one connection should be much shorter than the others.

If spurious tripping is experienced, corrections must be made in one or more of the above areas.