Connection
4
4.1 Safety information
Ins
tructions
DANGER
Hazardous voltages
Will cause death, ser
ious injury or property damage.
Turn o and lock out all power supplying this equipment before working on this device.
DANGER
Open transformer circuits will result in electric shock and arc ash hazar
ds
W
ill cause deat
h, serious injury or property damage.
When using the current transformers, the circuit is not protected by a fuse.
• Do not open the secondary circuit of the current transformers under load.
• Short circuit the secondary current terminals of the current transformer before removing
this device.
• It is imperative that you follow the safety instructions for the current transformers used.
CAUTION
Protection of the supply voltage and voltage measuring inputs
The fuses in t
he supply v
oltage and the voltage measuring inputs are only used for cable
protection. Selection of the fuse depends on the supply cable dimensioning. All commercially
available fuses and automatic circuit breakers up to 16 A (C) or 20 A (C) can be used. Choose
a fuse that conforms to the relevant regulations.
We recommend 5SY miniature circuit breakers, 3RV motor starter protectors, or 5SB/3NA fuses,
depending on the cable requirements, connection conditions, and the local codes and
standards requirements.
NOTICE
Use only as intended
Siemens products may be used onl
y for the applications described in the catalog and the
associated technical description.
The protection supported by the device can be impaired if the device is used in a manner not
dened by Siemens AG.
PAC4220
Equipment Manual, L1V30827278B-01 43
PSC Correction *** PSC Correction *** PSC Correction *** PSC Correction *** PSC Correction *** PSC Correction *** PSC Correction ***
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