Information On The Disconnector Unit; Overcurrent Protection By Means Of Line Fuses And Circuit Breakers - Siemens SINAMICS S120 Combi Equipment Manual

Line-side power components

2.2 Information on the disconnector unit

2.2 Information on the disconnector unit
A line disconnector is required to correctly disconnect the drive line-up from the line supply.
The line disconnector of the machine's electrical equipment can be used for this purpose.
The line disconnector must be selected in compliance with the requirements of the
internationally binding standard relating to the electrical equipment of machines EN 60204-1,
Section 5.3. The relevant technical data and any other loads connected to the electrical
equipment must be taken into account when making your selection.
NOTICE
If an operational drive line-up is switched off using a line disconnector, then the voltage at
interface X21, terminal 3 (EP +24 V) and 4 (EP M) must first be interrupted at the S120
Combi. This can be achieved with a leading disconnecting auxiliary contact (≥ 10 ms), for
example.
This protects external loads located parallel to the drive on the same switching component.
The accessories required for the line disconnector must be selected from the manufacturer
catalogs. See also catalog NC61.
2.3

Overcurrent protection by means of line fuses and circuit breakers

Line fuses and circuit breakers should be used for the line/overcurrent protection in order to
limit the damage to the S120 Combi if a fault does occur. NH, D, and DO type fuses with a
gL characteristic or suitable circuit breakers according to IEC 60947 can be used for this
purpose.
Table 2- 1 Characteristics of the line fuses and circuit breakers for S120 Combi Power Modules
Infeed Protective device
Fuse
Rated current
16 kW 35 A
20 kW 63 A
Table 2- 2 Recommended LV HRC line fuses (gL) and circuit breakers for S120 Combi Power Modules
Infeed
16 kW
20 kW
30
Circuit breaker
Tripping time Rated current
< 10 ms 35 A
< 10 ms 63 A
Recommended line fuse
3NA3814
3NA3822
Prospective short-circuit current
Tripping time Minimum value
< 15 ms > 1 kA
< 15 ms > 2.5 kA
Recommended circuit breaker
3RV1031-4FA10
3RV1041-4JA10
Manual, Edition 05.2010, 6SL3097-4AV00-0BP0
Maximum value
< 65 kA
< 65 kA
SINAMICS S120 Combi