Siemens SENTRON 3VL System Manual page 53

Special features of the VL160X
● The circuit breaker is tripped via an electromagnetic trip relay installed in the
compartment for circuit breaker accessories to the left of the toggle handle. The trip unit
is connected to the SENTRON VL RCD module and receives a trip command when the
preset fault currents are reached.
● Internal accessories can also be installed in the recess for SENTRON VL accessories to
the right of the toggle handle.
● The Reset button functions in exactly the same way as on the RCD modules VL160 to
400 and is accessible via the circuit breaker accessories cover supplied with this module.
● A special kit is available for mounting the RCD module and the VL160X next to each
other. The mounting adapter enables installation on a DIN 50023 mounting rail. The collar
of the combination is 45 mm wide along its entire length.
Note
Stored-energy motorized operating mechanisms and rotary operating mechanisms cannot
be installed with this product.
Special features of VL160, VL250, VL400
● The circuit breaker is released with immediate effect via a tappet from the RCD module to
the line protection switch. The electromagnetic trip unit is integrated into 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 design is compatible with the line 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. The contact is suitable for
– 2 A 250 V AC applications (0.5 A inductive)
– 0.5 A 125 V DC.
The lowest switching capacity is 50 mA at 5 V AC/DC.
● 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 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, care must be taken by means of suitable routing or protection circuits that the
amplitude of overvoltages (e.g. storm overvoltages) between the conductor and ground is
limited to 2.5 kV.
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
Functions
5.1 Current protection
53