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(3) Standard type electronic release SU20SM
Functions
Functions
Electronic release (SU20SM)
Ex9M2
Ex9M3
Ex9M4
Ex9M5
Overload protection
Current setting (A)I
r
=I
n
╳
0.4~1.0
，
increment 1A, can be set to OFF
7.2 IrRelease timeT
r
(s)
4
、
8
、
16
4
、
8
、
16
、
24
Precision
Precision ±10%
Release level
5
、
10
、
20
5
、
10
、
20
、
30
Short time delay short circuit protection
Current setting (A)I
sd
=I
r
╳
4~12
，
increment 1A, can be set to OFF, precision ±10%
Delay time T
sd
(ms)
100
，
precision ±40ms
Instantaneous short circuit protection
Current setting (A)I
i
=I
n
╳
15
，
not adjustable, precision ±15%
Maximum release time (ms)
60
N pole protection
Current setting (A)I
N
=I
n
╳
I
rN
=(0.5,1)xI
n
；
I
sdN
=(4~12)I
rN
; I
iN
=15I
rN
；
can be set to OFF
Release time
Same as phase pole
Grounding protection
Current setting (A)I
g
=I
n
╳
0.4-0.5-0.6-0.7-0.8-0.9-1.0
，
can be set to OFF, precision
±15%
Release time(s)
0.1-0.2-0.3-0.4
，
precision ±20% or ±40ms (which is bigger)
Phase unbalance/phase failure/jamming protection
Release current setting for phase
unbalance Iunbal (A)I
unbal
(30-40-50-60-70-80-90)% (90% is phase failure), can be set
to OFF
Maximum release time for phase
unbalance T
unbal
(s)
4-6-8-10
，
precision ±10%
Release time for phase failure(s)
0.25
，
precision ±20%
Current setting for motor jamming
(A)I
jam
(3~10)I
r
，
increment 1A, can be set to OFF, precision ±15%
Release time T
jam
(s)
1~30
，
increment 1s, precision ±10%
Circuit breakers with frame size from Ex9M2- Ex9M5 are all available with SU20SM electronic type
release, which are applicable to motor feeder circuit solutions with two or three elements. The release
is used with AC contactor to guarantee the normal operation of motor, among which:
●
The moulded case circuit breaker with SU20SM electronic type release provides overload
protection, short time short circuit protection and instantaneous short circuit protection:
*
The current settings for overload protection (0.4-1.0) In, with increment of 1A, this function can be
set to OFF.
*
The current settings for short time short circuit protection (4-12Ir), with increment of 1A, this function
can be set to OFF.
*
The current setting for instantaneous short circuit protection (15In) is not adjustable and this function
cannot be set to OFF.
●
Release levels at 7.2Ir:
*
Level 5 release: release time (3-5)s
*
Level 10 release: release time (5-10)s
*
Level 20 release: release time (10-20)s
*
Level 30 release: release time (20-30)s
*
The release levels for Ex9M2 are 5, 10, 20; the release levels for Ex9M3, Ex9M4 and Ex9M5 are 5,
10, 20, 30
●
Phase unbalance/phase failure protection
*
There are seven adjustable average current percentages for phase unbalance protection: (30-40-50-
60-70-80-90)%, this function can be set to OFF.
*
There are four adjustable maximum release times: 4-6-8-10s
*
The release time for phase failure protection is 0.25s
●
Jamming protection
*
(3~10)Ir, with increment of 1A, this function can be set to OFF.
*
The adjustment range for release time is (1-30)s, with increment of 1s
●
High release precision, reliable operation, free from the impact of ambient temperature
●
Operating ambient temperature: -35°C~+70°C
Ex9M moulded
case circuit breaker
Ex9C AC contactor
Motor
Motor feeder circuit two element
protection solution
