Advertisement
System pro M
System pro M
How supplementary devices can be mounted
firmly connected to the MCB
auxiliary switch or
undervoltage release and
signal contact or
signal contact
signal contact/auxiliary
switch
H 11
H2
H02
H 21 (kL)
H 12 (kL)
H 30 (kL)
H 03 (kL)
S
UA
AL
10
Supplementary devices
for S 280 UC miniature circuit-breakers
Additional retrofit devices
The following accessories can be easily added to MCBs of the S 280 UC series:
Auxiliary contact S2-H.. (X)
The auxiliary switch is fitted with 2 or 3 potential-free contacts and indicates clearly the position of the main contacts, i.e.
not only when the device trips due to overload, but also if switched off manually. Coupled to the contact mechanism, it is
trip-free.
The auxiliary switch comes either with screw-fixing or as plug-in device (switches with 3 potential-free contacts only
screw-type make).
Minimum switching capacity:
5 VA at 12 V
Minimum switching capacity:
0,1 VA at 12 V (H ... kL, low power)
Connection capacity:
2 x 1.5 mm
Pick-up torque:
0.8 Nm
Signal contact S2-S
Trips in the case of overload, earth leakage or short circuit, not, however, if switched off manually (has-tripped signal). The
signal (red acknowledgment button) can be cancelled without switching the MCB on again. Push the test button to check
on the control circuit and not interrupt the main circuit.
Undervoltage release UA (can be retrofitted to the left or the right)
For distance tripping of the MCB (switch OFF). An exciting coil makes it impossible to switch on the device unless a
voltage is applied. Where the supply voltage is interrupted or switched off, the undervoltage release makes the MCB trip
(suitable for emergency stop circuit).
Shunt trip AL . . . (can be retrofitted to the left)
For distance tripping of the MCB (switch OFF). The shunt trip has a relay coil with an integrated contact which
disconnects the coil and the coil voltage if the MCB trips, this prevents the continued flow of current in the case of
sustained coil voltage.
Separate supplementary devices
Neutral disconnector Nt
This component is fitted, if necessary, to the right of the MCB onto the mounting rail. It is used, e.g. to disconnect the
neutral prior to measurements. The design of the switching lever ensures that the neutral is lead-making contact when
the MCB is switched on.
short-circuit capacity:
10 kA
box terminal:
16 mm
2
sepa rately mounted
shunt trip or undervoltage release and
auxiliary switch or signal contact or signal
contact/auxiliary switch
2
neutral
can be disconnected
Advertisement
