APC Symmetra MW Installation Guide download pdf (Page 38)

Specifications: Required Breaker Settings (400 V Systems)

32 Symmetra MW 800 kW 3 × 400/230 V Installation Guide - 990-1510B

22 kA is the maximum peak let-through current (including safety factor) available during clearing of

an internal fault in a 200 kW section or a Power Module. During or after a controlled fault clearing,

none of the breakers are allowed to trip on the instantaneous trip setting below the specified value.

The maximum peak let through current is applicable to utility with prospective short-circuit currents

up to 200 kA.

The following diagram shows a dual mains systems in which the upstream breakers are named Q.

Correct settings of upstream breaker settings are mandatory. The systems can also be configured as

single mains systems.

Note

The instantaneous trip setting must not be derated even though the UPS system is derated

in system output power. The system size has no influence on the instantaneous trip

setting.

Note

For derated or parallel systems, the APC Application Team provides the correct breaker

settings and breaker frame sizes.

Note

For upstream breakers not mentioned in the table, the APC Application Team provides

the correct breaker settings for on-line, overload, and trip currents.

Q6Q5

Dual Mains Single Installation

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APC Symmetra MW Installation Guide Page 38