Siemens SENTRON 3VL160X System Manual page 46

Functions
4.1 Protection functions
Special features of the VL160X
● The molded case circuit breaker is tripped via an electromagnetic trip relay installed in the
breaker accessories compartment to the left of the toggle lever. The trip unit in the
molded case circuit breaker is connected to the RCD module and receives a trip
command when the preset fault currents are reached.
● Internal accessories can still be installed to the right of the toggle lever.
● The Reset button functions in exactly the same way as on the RCD modules VL160 to
400 and is accessible via the molded case circuit breaker accessories cover supplied with
this module.
Note
Motorized operating mechanism with stored energy mechanisms and rotary operating
mechanisms cannot be installed with this product.
Special features of VL160, VL250, VL400
● The molded case circuit breaker is tripped by means of a direct-acting tappet from the
RCD module to the system protection switch. The electromagnetic trip unit is integrated in
the RCD module.
● The Reset button pops out beyond the surface of the RCD module cover to indicate that
the RCD module has tripped the system protection switch. This unit prevents the system
protection switch contacts from closing before the Reset button of the RCD module has
been manually reset.
● This has the same design as the system protection switch accessories including the
accessories for external operating mechanisms as well as for fixed-mounted assembly,
plug-in assembly and withdrawable assembly.
● An auxiliary switch (changeover contact) is available. The contacts change status when
the RCD module trips the system protection switch.
● Remote tripping is supported. The customer connects a switch (NO contact) to terminals
X13.1 and X13.3 via a twisted-pair cable. The switching contact must have a minimum
switching capacity of 5 V/1 mA (e.g. SIEMENS 3SB3). If the NO contact is actuated, the
RCD module trips. The connection terminals X13.1 and X13.3 are galvanically isolated
from the system by means of a transformer (functional extra low voltage, FELV). The
maximum trip time of the molded case circuit breaker with differential current protection is
50 ms regardless of the set trip time delay Δt. In special cases, such as routing of the
cable outside, ensure by means of suitable cable routing or protection measures that the
amplitude of overvoltages (e.g. overvoltages due to thunderstorms) between the
conductor and ground is limited to 2.5 kV.
46
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03