American Power Conversion 208/220 installation manual Recommended current protection

Site Preparation – Operating Environment

Recommended current protection

AC output over-current protection and AC output disconnect must be provided by the customer.

Note

Dual/single
mains	Connection	10 kVA	15 kVA	20 kVA	30 kVA	Notes
configuration
Single	Mains/bypass	35 A	60 A	80 A breaker	125 A breaker
	input	breaker (30	breaker (30	(30 kAIC)	(30 kAIC)
		kAIC)	kAIC)
Dual	Mains input	35 A	60 A	80 A breaker	125 A breaker	1, 2
		breaker	breaker	(30 kAIC)	(30 kAIC)
		(30 kAIC)	(30 kAIC)
Dual	Bypass input	35 A	60 A	80 A breaker	125 A breaker	1, 2
		breaker	breaker	(30 kAIC)	(30 kAIC)
		(30 kAIC)	(30 kAIC)
Any	Output	35 A fast-	60 A fast-	80 A fast-	125 A fast-	3, 4
		acting class	acting class	acting class	acting class
		J fuse	J fuse	J fuse	J fuse

Note 1: If the available fault current of the installation is below 30 kA, a lower kAIC-rated breaker can be used.

Note 2: For breaker settings, refer to below table listing available overload currents.

Note 3: If the available fault current of the installation is less than 1200 A for the 10 kVA and 15 kVA UPS sizes, and below 2300 A for the 20 kVA and 30 kVA UPS sizes, a breaker (of the same value as for the bypass input) can be used.

Note 4: Recommended maximum rating of a single-fuse configuration if the internal bypass is to be protected during a load short-circuit.

Minimum breaker settings for 10 kVA UPS

Overload Event	Mains input	Bypass input	Output	Duration	Notes
Internal fault	2 kA	1.7 kA	14 kA	<10 ms	1
800% overload bypass	–	223 A	223 A	500 ms
operation
150% overload normal/	–	–	42 A	30 s
battery operation
125% overload normal/	–	–	35 A	60 s
battery operation
Continuously	34 A	31 A	31 A	∞

Note 1: For the output value, the short-circuit-level is indicated.

990-1598B Smart-UPS® VT 10-30 kVA, 208/220 V Site Preparation and Installation Manual 13