Siemens SENTRON 3WL10 - Current Reduction; Current Reduction Depending on the Ambient Temperature on the 3 WL10

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Ambient temperature

The circuit breaker can be operated in ambient temperatures from -25 °C to +70 °C. At

temperatures of up to +70 °C, too, the rated current is not reduced (derating, see below).

The display of the electronic trip units of the 6-series is active over the entire operating range.

The permissible storage temperature in original Siemens packaging is between -40 °C

and+70 °C.

Installation altitudes

An installation altitude above 2000 m can result in higher temperatures on the switching

devices. The lower density of air can signi󹪝cantly reduce heat dissipation. The arcing

behavior and the conductivity of the density-dependent ionized gas mixture are also less

favorable at greater altitudes. This makes it necessary to decrease rated operational voltage

and the rated uninterrupted current.

Altitude [m] 2000 3000 4000 5000

Rated voltage 440V [V] 440 387 343 300

Rated voltage 690V [V] 690 607 538 470

Rated uninterrupted current [%I

] 100 98 93 90

Rated ultimate short-circuit

breaking capacity ACI

[%I

]

100 100 100 100

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