Technical information

2/16
1SDC210033D0202
MF/MA
Main characteristics:
Q available for XT2, XT3 and XT4 in the three-pole version only, these trip units are mainly used for
protecting motors, in conjunction with a thermal relay and a contactor;
Q protections:
– against instantaneous short-circuit (I) for XT2: for In)12.5A the protection threshold I is fi xed
at 14xIn, whereas for In>12.5A the protection threshold I is adjustable from 6..14xIn;
– against instantaneous short-circuit (I) for XT3: the protection threshold I is adjustable from
6..12xIn;
– against instantaneous short-circuit (I) for XT4: the protection threshold I is adjustable from
5..10xIn;
Q the magnetic protection setting is made by turning the relative cursor on the front of the release.
Circuit-breakers for motors protection
Magnetic trip units
XT2
MF/MA
I
3
= 14xIn [A]
I
3
= 6..14xIn [A]
In [A] 1
(1)
2
(1)
4
(1)
8.5
(1)
12.5
(1)
20 32 52 80 100
I
3
= MF 14 28 56 120 175
I
3
= MA 120...280 192…448 314…728 480…1120 600...1400
(1)
Available only as complete circuit-breaker
XT3
MA
In [A] 100 125 160 200
I
3
[A] 600…1200 750…1500 960…1920 1200…2400
I
3
= 6..12xIn
XT4
MA
In [A] 10
(1)
12.5
(1)
20 32 52 80 100 125 160 200
I
3
[A] 50…100 62.5…125 100…200 160…320 260…520 400…800 500…1000 625…1250 800…1600 1000…2000
I
3
= 5..10xIn
(1)
Available only as complete circuit-breaker
Rotary switch for magnetic
protection setting