990-91377B-001

Upstream and Downstream Protection for IEC

DANGER
Hazard of electric shock, explosion, or arc flash
  • Circuit breakers must have instantaneous trip time of maximum 60 ms.
  • Circuit breakers must have instantaneous override values set according to the table below.
  • Circuit breakers must be installed for input (unit input breaker UIB) and bypass (static switch input breaker SSIB).
  • For parallel system with three or more UPSs: Circuit breakers must be installed for the output (unit output breaker UOB) of each UPS. The unit output breaker (UOB) is sized as the static switch input breaker (SSIB).
Failure to follow these instructions will result in death or serious injury.

Schneider Electric reserves the right to remove the Live Swap label from the product front if the conditions are not met.

NOTE: For local directives which require 4-pole circuit breakers: If neutral conductor is expected to carry a high current, due to line-neutral non-linear load, the circuit breaker must be rated according to expected neutral current.

Recommended Upstream Protection for IEC

UPS rating 200 kW 250 kW
  Input Bypass Input Bypass
Breaker type NSX400H Mic 2.2 (LV432695) NSX400H Mic 2.2 (LV432695) NSX630H Mic 2.2 (LV432895) NSX400H Mic 2.2 (LV432695)
Io 400 320 500 400
Ir 1 1 1 1
Isd ≤10 ≤10 ≤10 ≤10
UPS rating 300 kW 350 kW 400 kW
  Input Bypass Input Bypass Input Bypass
Breaker type NSX630H Mic 2.2 (LV432895) NSX630H Mic 2.2 (LV432895) NS800H Mic 5.0 (33553) NSX630H Mic 2.2 (LV432895) NS800H Mic 5.0 (33553) NSX630H Mic 2.2 (LV432895)
Io 1 1 0.8 0.96 0.95 1
Ir 570 500 570 630
tr ≥4 ≥4
li (x In) ≤10 ≤10
Isd ≤10 ≤10 ≤10 ≤10 ≤10 ≤10
UPS rating 450 kW 500 kW
  Input Bypass Input Bypass
Breaker type NS1000H Mic 5.0 (33559) NS800H Mic 5.0 (33553) NS1000H Mic 5.0 (33559) NS800H Mic 5.0 (33553)
Ir 0.9 0.9 0.95 0.95
tr ≥4 ≥4 ≥4 ≥4
li (x In) ≤8 ≤10 ≤8 ≤10

Recommended Downstream Protection for Distribution Circuit Breakers for IEC

NOTE: The recommended downstream protection for distribution circuit breakers is sized for protection of the SCRs in the static bypass switch and for coordination with the unit input breaker (UIB)/static switch input breaker (SSIB) when external backfeed protection is used.
UPS rating 200 kW 250 kW 300 kW 350 kW 400 kW 450 kW 500 kW
Breaker type NSX160H Mic 2.2 NSX250H Mic 2.2 NSX400H Mic 2.2
Ir 160 250 400
Isd 10 10 10
QR code for this page

Was this helpful?