-20 ... +60 deg C & Operation - In Enclosure -> -20 ... +40 deg C". Do we have to de-rate for +50 in enclosure?| Schneider Electric Česká republika" />
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As per catalog GV2ME - Ambient temperature shown as "Operation - Open mounted -> -20 ... +60 °C & Operation - In Enclosure -> -20 ... +40 °C". Do we have to de-rate for +50 in enclosure?

Our GV2 and GV3 thermal-magnetic circuit breakers have a temperature compensation system.
This system allows retaining the thermal tripping level when the ambient temperature is from -20° to 60°C for the open offer and from -20°C to +40 °C for the enclosed offer.

For a GV2 or GV3 installed as an “open” device, meaning mounted in a larger industrial control panel along with other devices, they are rated for 60 °C.  This means the ambient air around the device can be up to 60 °C.  They can be installed at an ambient temperature of up to 70 °C if derated by 1% for each 1 °C increment above 60 °C.

For an enclosed GV2 or GV3, meaning purchased already mounted within the enclosure and intended to be the only device within that enclosure they are rated for 40 °C.  This ambient refers to the temperature outside of the enclosure.  These can be installed in an ambient temperature of up to 50 °C if derated by 1% for each 1 °C increment above 40 °C.

In either case, you can not exceed a temperature above 70°C for open-mounted and 50 °C for enclosure mounted.

Schneider Electric Česká republika

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