Bosch BPT-C 200 Betriebsanleitung Seite 112

20 | Safety
AC circuit breaker
LV HRC disconnector
BPT-C 200, 300, 350 | Operating manual
An AC circuit breaker with isolating properties or a fuse switch with a
fusible cut-out of gG standard must be connected upstream of each central
inverter.
Please note the following here:
When selecting the AC circuit breaker: Special requirements when

operating with transformerless central inverters. If you are unsure, please
contact the manufacturer.
AC circuit breaker must be adjusted to the rated current of the device.

If the AC circuit breaker meets the requirements of an AC disconnector,

check if a further AC disconnector is required.
 If the AC circuit breaker meets the requirements for fusing the device,
then it is not generally necessary to insert a fuse on the AC side.
When selecting the fuse (LV HRC disconnector) note:
 Local directives and regulations
 The ambient temperature influences the trigger behaviour of the fuse.
 If the rated current on the type plate differs from the rated current for the
fuse inserts, use a fuse insert with the next highest rated current
If the LV HRC disconnector meets the requirements of an AC disconnector,

check if an additional AC disconnector is required
 If the LV HRC disconnector meets the requirements for fusing the device,
then it is not generally necessary to insert a fuse on the AC side.
If you have any questions regarding the dimensioning of the fuses, please

contact the fuse manufacturer. Please note the following here:
– There are fuses which cannot support the rated current continuously.
– Level of performance 200 kVA: Maximum 450 A, use type gG
– Level of performance 300 kVA: Maximum 630 A, use type gG
– Level of performance 350 kVA: Maximum 722 A, use type gTr or gG.
Insulation and earth fault monitoring of the IT grid
The reliability of the IT grid must be guaranteed with insulation and earth
fault monitoring. The monitoring system detects an insulation fault or earth
fault even as it is developing and reports it before a second fault interrupts
operation.
Please note the following here:
 Only use insulation and earth fault monitoring with unearthed solar
generators
Insulation and earth fault monitoring must comply with the local

regulations and the accident prevention regulations.
 Insulation and earth fault monitoring must be suitable for operation in
mixed networks (AC and DC). Otherwise, incorrect triggering or incorrect
measurements can occur due to the operating behaviour of the inverter.
 Measurement range from approx. 2 kΩ
 Trigger value 4 kΩ (manufacturer's recommendation). Otherwise, device-
internal leakage resistances and leakage currents in the solar generator
can result in incorrect triggering.
 Insulation and earth fault monitoring must be switched in such a way that
the central inverter is immediately disconnected from the grid when it is
triggered. Grid disconnection options:
– Interrupt auxiliary power supply
– Use a section switch
English
Bosch Power Tec GmbH