Siemens SENTRON PAC4220 - Page 51

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1)
The fuses are only used for cable protection.
All commerciall
y available miniature circuit breakers up to 20A(C) can be used.
2)
Connection of supply voltage
3)
Install a short-circuit device. Protection against overvoltage when the secondary transformer
cir
cuit is open.
4)
Cir
cuit breaker
Figure4-1 Connection type 3P4W, without voltage transformer, with 3 current transformers
(2) 3-phase measurement, 4 conductors, unbalanced load, with voltage transformer,
with 3 curr
ent transformers
Connection type 3P4W
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9
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9
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9
1
NONONO
1)
The fuses are only used for cable protection.
All commerciall
y available miniature circuit breakers up to 20A(C) can be used.
2)
Connection of supply voltage
3)
Install a short-circuit device. Protection against overvoltage when the secondary transformer
cir
cuit is open.
4)
Cir
cuit breaker
Figure4-2 Connection type 3P4W, with voltage transformer, with 3 current transformers
(3) 3-phase measurement, 4 conductors, balanced load, without voltage transformer,
with 1 curr
ent transformer
Connection
4.3Connection examples
PAC4220
Equipment Manual, L1V30827278B-01 49