
37
36
(1) Electromagnetic type release M
(2) Basic type electronic release SU20LM
Functions
Functions
Circuit breakers with frame size from Ex9M1- Ex9M5 are all available with electromagnetic type
release M, which are applicable to motor feeder circuit solutions with three elements. The release is
used with AC contactor and thermal relay to guarantee the normal operation of motor, among which:
●
The moulded case circuit breaker M type release is used for instantaneous short circuit protection
●
The AC contactor is used for start/stop operation of motor
●
The thermal relay is used for overload, phase failure and phase unbalance protection
Instantaneous short circuit protection is realized by electromagnetic release.
The neutral pole protection of 4-pole circuit breaker (4P4T) is the same as other phase lines, and the
contact can be disconnected at the same time with other phase lines.
Circuit breakers with frame size from Ex9M2- Ex9M5 are all available with SU20LM 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 SU20LM electronic type release provides overload protection, short time short circuit protection,
instantaneous short circuit protection and phase unbalance protection
*
There are seven adjustable current settings for overload protection (0.4-0.5-0.6-0.7-0.8-0.9-1.0In), this function can be set to OFF.
*
There are seven adjustable current settings for short time short circuit protection (5-6-8-9-10-11-12Ir), 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
●
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
Ex9R thermal relay
Motor
Motor feeder circuit three element
protection solution
Electronic release (SU20LM)
Ex9M2
Ex9M3
Ex9M4
Ex9M5
Overload protection
Current setting (A)I
r
=I
n
╳
0.4-0.5-0.6-0.7-0.8-0.9-1.0
,可
OFF
7.2I
r
Release 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
╳
5-6-8-9-10-11-12
,
can be set to OFF, precision ±15%
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
=(5-6-8-9-10-11-12)I
rN
I
iN
=15I
rN
;
can be set to OFF
Release time
Same as phase pole
Phase unbalance/phase failure
Release current setting for phase unbalance Iunbal (30-40-50-60-70-80-90)%(90% is phase failure), can be set to OFF
Maximum release time for phase unbalance
4-6-8-10
,
precision ±10%
Release time for phase failure
0.25
,
precision ±20%
Motor protection
Electromagnetic
release M
Ex9M1
Ex9M2
Ex9M3
Ex9M4
Ex9M5
Pole number
3P/4P
3P/4P
3P/4P
Instantaneous short circuit protection
Current setting (A)
I
i
=I
n
х
12
1)
9-10-11-12-13-14
Precision
±20%
N pole protection
Current setting (A)
I
iN
=I
n
х
12
Same as I
i
Precision
±20%
Note:
1)
The current of Ex9M1 3P/4P is 125A/160A, with instantaneous short circuit protection
I
i
=I
n
х (9-10-11-12-13-14).