Functions; Protection Functions; Overcurrent Release - Siemens SENTRON 3VL160X System Manual

Functions

4.1

Protection functions

4.1.1

Overcurrent release

The 3VL molded case circuit breakers are designed on the principle of magnetic repulsion of
the contacts. The contacts open before the expected peak-value of the short-circuit current is
reached. Magnetic repulsion of the contacts very considerably reduces the thermal load I
as well as the mechanical load resulting from the impulse short-circuit current I
system components that occur during a short-circuit.
(1)
(2)
(3)
(4)
(5)
(6)
Figure 4-1
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03
Main connections
Breaker mechanism
Overcurrent release
Movable contact arm
Arc chute
Enclosure
Interior view MCCB
4
t
2
of the
p
35