Siemens SINAMICS S120 Equipment Manual page 124

Line-side power components
4.7 Active Interface Modules Chassis-2
Fuses
The pre-charging input circuit components are protected against overload using fuses.
The following fuses are recommended:
● In a version with one precharging resistor for each phase, fuses of the 3NE1 817-0 (50 A)
type are recommended.
● For a version with two precharging resistors connected in parallel for each phase, 3NE1
021-0 fuses (100 A) are recommended.
● For a version with three precharging resistors connected in parallel for each phase, 3NE1
021-0 fuses (100 A) are recommended.
Main contactor
A circuit breaker is used as the main contactor. It is used to connect the Active Interface
Module Chassis-2 to the supply system.
A 3WL1220 circuit breaker is recommended.
The circuit breaker is controlled via terminal -X9: HS1, HS2 of the Active Line Modules
Chassis-2.
An additional normally open contact (NO contact) of the circuit breaker must be routed to
terminal -X47:3 to guarantee the feedback signal. The 24 V DC supply can be taken from
terminal strip -X42.
122
Air-cooled chassis power units
Manual, 07/2019, 6SL3097-4AE00-0BP9