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External protection devices
Magnetothermal
In order to set up the power line, install a magnetothermal switch Tri Power X33 HEtream from the TRI POWER X33
HE with intervention curve B or C. Please follow the indications in the table below:
Automatic external protections
TRI POWER X33
HE Mod.
Mains input
Separate bypass input (optional)
30kVA
100A
100A
40kVA
100A
100A
If the protection device Tri Power X33 HEtream of the TRI POWER X33 HE interrupts the neutral
conductor, it must also interrupt all the phase conductors at the same time (quadripolar switch).
Output protections (recommended selectivity values)
Normal fuses (gL-gG)
In (Nominal current)/7
Magnetothermal switches (C curve)
In (Nominal current)/7
Ultrarapid fuses (GF)
In (Nominal current)/3
Differential
In the absence of an input separating transformer, the neutral from the mains power supply is connected to the
neutral of the TRI POWER X33 HE output. This way the neutral regime of the equipment is not modified.
THE INPUT NEUTRAL IS CONNECTED TO THE OUTPUT NEUTRAL
THE DISTRIBUTION SYSTEM THAT POWERS THE TRI POWER X33 HE IS NOT MODIFIED BY THE TRI
POWER X33 HE
WARNING: make sure that the equipment is connected correctly to the input neutral, or else
damages to the TRI POWER X33 HE may be caused.
The neutral regime is modified only in presence of an isolation transformer or when the TRI POWER X33
HE operates with a neutral isolated Tri Power X33 HEtream.
When operating from mains power, a differential switch located at the input can intervene as the output circuit is not
isolated from the input circuit. Anyhow, other differential switches can be inserted at the output, possibly coordinated
with the switches at the input.
The differential switch located Tri Power X33 HEtream must have the following features:
Differential current adjusted to the sum of the TRI POWER X33 HE load. It is strongly recommended to keep
an adequate margin in order to avoid delayed interventions (100mA min. - 300mA recommended)
type B or type A
delay greater than or equal to 0,1s
