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Entry type: FAQ Entry ID: 109478887, Entry date: 02/23/2018
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Operation of SIRIUS relays in altitudes of up to 5000m above sea level

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This FAQ contain the statements for reduction voltage and current depend on the sea level.

 

QUESTION:

Under what conditions is it permissible to operate SIRIUS relays 3RN2, 3RP, 3RQ, 3RR, 3RS1, 3RS2, 3TG, 3TX7, 3UG, LZS, LZX at site altitudes of 2000m to 5000m above sea level?


 

ANSWER:

For the operation of SIRIUS relays1) 3RN2, 3RP, 3RQ, 3RR, 3RS1, 3RS2, 3TG, 3TX7, 3UG, LZS, LZX at altitudes over 2000m* above sea level the following reductions apply:
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Site altitudes up to 2500m above sea level:
- Reduction of rated insulation voltage to 0,93 x Ui
- Reduction of load current to 0,93 x Ie
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Site altitudes up to 3000m above sea level:
- Reduction of rated insulation ivoltage to 0,88 x Ui
- Reduction of load current to 0,88 x Ie
-----
Site altitudes up to 4000m above sea level:
- Reduction of rated insulation voltage to 0,79 x Ui
- Reduction of load current to 0,78 x Ie
-----
Site altitudes up to 5000m above sea level:
- Reduction of rated insulation voltage to 0,75 x Ui
- Reduction of load current to 0,7 x Ie
-----
These ratings apply to a maximum ambient temperature of 40°C.

1) For SIRIUS relays with ATEX approval in EX environment is the maximum permissible altitude reduced to 2000m.

* According IEC 60947-1, 6.1.2 Altitude:
The altitude of the site of installation does not exceed 2000m.

NOTE:
For equipment to be used at higher altitudes, it is necessary to take into account the reduction of the dielectric strength and the cooling effect of the air. Electrical equipment intended to operate under these conditions shall be designed or used in accordance with an agreement between manufacturer and user.

 

Keywords:

Altitude, derating, height, limiting, reduction

 

 

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