Required Breaker Settings

The Symmetra® MW is a fault-tolerant system capable of handling and surviving overloads and internal/external faults. The overload performances and fault clearings are possible when the system meets specified minimum requirements for breaker settings. The settings are specified in the tables below, but some of them can also be found in the Electrical Specification section. The settings are all minimum settings and may not result in a drop-out.

See separate guide on parallel operation for information on required breaker settings in parallel systems.

Input and upstream breakers — minimum settings

Q1, Q5, and any upstream breaker

Duration [S]	Current [A]	Total load [%]	Event/Operation

< 0.005	18 kA	--	Internal fault clearing

∞	1880*	130	Overload on-line

∞	1245	100	On-line

∞	1370	110	On-line + Max. Battery
			Charge

	* Only applicable to Q1

Output and downstream breakers — minimum settings

Q2, Q4, Q6, and any downstream breaker

Duration [S]	Current [A]	Total load [%]	Event/Operation

< 0.005	18 kA	--	Internal fault clearing.

60	2406*	200	Overload on-line

600	1504*	125	Overload on-line

∞	1203	100	On-line

* Only applicable to Q2 and Q4

Symmetra MW 1000 kW 480 V Installation - 990-4112E

American Power Conversion MW manual Required Breaker Settings

Models: MW