Installation
4.2 Electrical Installation
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
49
Branch circuit protection according to IEC
Table 4- 6
Branch circuit protection according to IEC
Max. rated current of the protec-
tion device
Article No. of the fuse
Article No. of the circuit breaker
25 A
3NA3810
3RV2021…, 3RV1031…,
3RV2031…
30 A
-
3RV1742
Branch circuit protection according to UL standards
Use in North America requires protection devices that meet UL standards as detailed in the
following tables.
Table 4- 7
Overview of the approved protection devices according to UL standards
Protection device
UL category
Fuses of any manufacturer with faster tripping characteristic than class RK5, e.g.
class J, T, CC, G, or CF
JDDZ
SIEMENS circuit breaker
DIVQ
Intrinsically safe SIEMENS circuit breaker
NKJH
Table 4- 8
Branch circuit protection with non-semiconductor fuses of Classes J, T, CC, G or CF (UL
Category Code JDDZ)
Max. rated current of the fuse
Short circuit current rating SCCR
30 A
65 kA, 480 V 3 AC
Table 4- 9
Branch circuit protection with circuit breaker, UL categories DIVQ and NKJH
Max. rated current of the
circuit breaker
Article No.
UL cat.
Short circuit cur-
rent rating SCCR
30 A
3RV2711…
DIVQ
65 kA,
480Y/277 V AC
3RV1742…, LGG… or CED6…
DIVQ
65 kA, 480 V 3
AC
25 A
3RV2021-4DA…
NKJH
65 kA,
480Y/277 V AC
3RV1031-4DA… or 3RV2031-4DA…
NKJH
65 kA,
480Y/277 V AC
22 A
3RV2721…
DIVQ
50 kA,
480Y/277 V AC
