L6555
Emax
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Doc. no.
Model
Apparatus
Scale
Page No
1SDH000460R0002
Time delay device for undervoltage release (D)
The undervoltage release can be combined with an electronic time-delay device for installing outside the circuit-breaker, which
enables a delay in the tripping of the release with preset, adjustable times. The use of the delayed undervoltage release is rec-
ommended when the power supply network of the release can be subject to power cuts or short-lived voltage drops, in order
to avoid trips.
When it is not supplied, circuit-breaker closing is prevented.
The time-delay device has to be combined with an undervoltage release with the same voltage as the time-delay device.
Reference fi gures in the electrical circuit diagrams: YU + D; (7).
The characteristics of the time-delay device are:
Power supply (D):
24-30 V AC/DC
48 V AC/DC
60 V AC/DC
110-127 V AC/DC
220-250 V AC/DC
Adjustable opening time (YU+D): 0,5-1-1,5-2-3 s
Geared motor for automatic closing spring loading (M)
This automatically loads the circuit-breaker operating mechanism closing springs. After circuit-breaker closing, the geared motor
immediately sees to reloading the closing springs.
When there is no power supply or during maintenance work, the closing springs can still be loaded manually (by means of the
special lever on the operating mechanism).
Power supply
24-30 V AC/DC
48-60 V AC/DC
100-130 V AC/DC
220-250 V AC/DC
Operation limits: 85…110% Un
(Norme CEI EN 60947-2)
Inrush power consumption (Ps):
DC = 500 W
AC = 500 VA
Rated power (Pn):
DC = 200 W
AC = 200 VA
Inrush time 0,2 s
Loading time: 4-5 s
Insulation voltage 2500 V 50 Hz (per 1 min.)
It is always supplied with limit contacts and microswitch for signalling closing springs loaded.
Reference fi gure in the electrical circuit diagrams: M (1)
Mechanical and electrical trip signalling for overcurrent releases
The following signals are available following tripping of the overcurrent release:
a) Mechanical trip signalling for overcurrent releases
This enables a visual signalling on the operating mechanism by pushing the trip pushbutton in when the circuit-breaker has been
opened following tripping of an overcurrent release. The circuit-breaker can only be closed again by putting the pushbutton back
into its normal position included in the standard confi guration.
Reference fi gure in the electrical circuit diagrams: S51 (13).
b) Electrical and mechanical trip signalling for overcurrent releases
This enables a visual signalling on the operating mechanism (mechanical) and remotely (electrically by means of a changeover
switch) of the circuit-breaker being opened following a trip of the overcurrent releases. To reset the circuit-breaker, it is necessary
to reset the mechanical indicator pushbutton.
Reference fi gure in the electrical circuit diagrams: S51 (13).
c) Coil for resetting the mechanical release trip indicator
This enables a visual signalling on the operating mechanism (mechanical) and remotely (electrically by means of a changeover
switch) of the circuit- breaker being opened following a trip of the overcurrent releases. With this accessory, you can reset the
mechanical indicator with an electronic relay using a remote control and this enables the circuit-breaker to be reset.
Power supply:
24-30 V AC/DC
220-240 V AC/DC
110-130 V AC/DC
Reference fi gure in the electrical circuit diagrams: S51 (14)
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