Environmental Conditions

Ambient Temperature

The ambient temperature refers to the temperature of the air immediately surrounding the device.

• Operation temperature

  • -5 °C to +70 °C (23 °F to 158 °F): normal operating temperature

  • Down to -35 °C (-31 °F): device closing

• Storage temperature

  • -40 °C to +85 °C (-40 °F to 185 °F): ComPacT NS630-3200 circuit breakers without MicroLogic trip unit

    and ComPacT NS630–1600b switch-disconnectors

  • -25 °C to +85 °C (-13 °F to 185 °F): ComPacT NS circuit breakers with MicroLogic trip unit

    and ComPacT NS1600b-3200 switch-disconnectors

Extreme Atmospheric Conditions

ComPacT NS devices have successfully passed the tests defined by the following standards for extreme atmospheric conditions:

• IEC 60068-2-1: dry cold at -55 °C (-67 °F)

• IEC 60068-2-2: dry heat at +85 °C (185 °F)

• IEC 60068-2-30: damp heat (temperature +55 °C (-67 °F), relative humidity 95%)

• IEC 60068-2-52 level 2: salt mist

ComPacT NS devices can operate in the industrial environments defined by standard IEC 60947-1 (pollution degree up to 3).

It is nonetheless advised to check that the devices are installed in suitably cooled switchboards without excessive dust.

Vibrations

ComPacT NS devices have successfully passed testing in compliance with standard IEC 60068-2-6 for the levels required by merchant-marine inspection organizations (such as Veritas and Lloyd’s):

• 2 to 13.2 Hz: amplitude ±1 mm (±0.04 in)

• 13.2 to 100 Hz: constant acceleration 0.7 g (0.25 oz)

Electromagnetic Disturbances

ComPacT NS devices are protected against:

• Overvoltages caused by devices that generate electromagnetic disturbances.

• Overvoltages caused by an atmospheric disturbance or by a distribution system outage (for example, interruption of a lighting system).

• Devices emitting radio waves (for example, radios, walkie-talkies, radar).

• Electrostatic discharges produced by users.

ComPacT NS devices have successfully passed the electromagnetic compatibility tests (EMC) defined by the following international standards:

• IEC 60947-2, annex F

• IEC 60947-2, annex B (trip units with earth-leakage function)

The above tests help to guarantee that:

• No nuisance tripping occurs.

• Tripping times are respected.

Altitude Derating

Altitude does not significantly affect device characteristics up to 2,000 m (6,600 ft). Above this altitude, it is necessary to take into account the decrease in the dielectric strength and cooling capacity of air. The following table gives the corrections to be applied for altitudes above 2,000 m (6,600 ft). The breaking capacities remain unchanged.

Intermediate values may be obtained by interpolation