Catalogue MOTOR PROTECTION CIRCUIT BREAKERS
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Motor protection circuit breakers
With thermal and magnetic trip releases
-3
_electric
Motor protection circuit breakers SM2A-SM3A up to 100A
Order
Short circuit
Short circuit
Qty
Wt
code
thermal
breaking
per
trip
capacity
pkg
adjustment
at 400V
range
Icu
Ics
[A]
[kA]
[kA]
n°
[kg]
Breaking capacity Icu 50kA at 400V.
11 SM2A 64
22-32
50
25
1
0.960
11 SM2A 68
28-40
50
25
1
0.960
11 SM2A 72
36-45
50
25
1
0.960
11 SM2A 76
40-50
50
25
1
0.960
General characteristics
The SM2A and SM3A types are circuit breakers with a wide adjustment range, 22 to 100A, in only two frame sizes enabling motor control and protection up to 45kW (400V).
A magnetic trip indicator and padlockable operating handle are integrated on the SM2A and SM3A breakers. Both are suitable for isolation according to IEC/EN 60947 standards.
Their high breaking capacity consents to exclude protection fuses on the majority of the installations.
Operational characteristics
- Rated insulation voltage Ui: 690V
Breaking capacity Icu 50kA at 400V.
11 SM3A 84
45-63
50
25
1
2.100 _
11 SM3A 88
57-75
50
25
1
2.100
11 SM3A 92
70-90
50
25
1
2.100 _
11 SM3A 96
80-100
50
25
1
2.100
Rated impulse withstand voltage: 6kV Rated frequency: 50/60Hz
Maximum rated current: 50A (SM2A) and 100A (SM3A) Number of adjustment ranges: SM2A: 4 (22 to 50A) SM3A: 4 (45 to 100A)
Breaking capacity: See table below Power dissipation: SM2A: 7.1-20W SM3A: 10-38W Magnetic tripping: 13In max Thermal tripping class: 10 Phase failure sensitive
11 SM2A...
Life (cycles): Mechanical
SM2A 50,000 SM3A 50,000
Electrical (le AC3)
25,000
25,000
Mounting:
SM2A - Screw fixing or on 35mm DIN rail
(IEC/EN 60715) SM3A - Screw fixing or on DIN rail 35mm
(IEC/EN 60715) or 75mm (IEC/EN 60715) Mounting position: Any Utilisation category: A Degree of protection: IP00.
Certifications and compliance
Certifications obtained: cuius, CSA. Compliant with standards: IEC/EN 60947-1, IEC/EN 60947-2, IEC/EN 60947-4-1.
NOTE: When more than one breaker are mounted, side by side, without leaving space between each to consent free air circulation on the breaker sides, and have simultaneous operation, the thermal trip adjuster must be positioned at a value 15% greater than the rated motor current.
11 SM3A...
Breaking capacity
Type
Rated short-circuit breaking capacity [kA]
Protection fuses when I > Icu (gL or gG fuses) ©
230V
400V
500V
690V
230V
400V
500V
690V
Icu
Ics
Icu
Ics
Icu
Ics
Icu
Ics
[A]
[A]
[A]
[A]
SM2A 64
100
100
50
25
10
5
4
2
▲
125
100
63
SM2A 68 / SM2A 72
100
100
50
25
10
5
4
2
▲
160
100
63
SM2A 76
100
100
50
25
10
5
4
2
▲
160
100
80
SM3A 84
100
100
50
25
12
6
6
3
▲
160
100
80
SM3A88
100
100
50
25
8
4
5
3
▲
160
125
100
SM3A 92 / SM3A 96
100
100
50
25
8
4
5
3
▲
160
125
125
© Fuses are used only in those cases when the value of short-circuit current at the breaker installation point exceeds the breaking capacity of the breaker. ▲ Industrial fuse not required.
ir
Add-on blocks/Accessories pages 1-8 and 9
Dimensions page D-3
Wiring diagrams page W-2
Technical characteristics page TC-2
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Contents table
page 1 p.1
page 2 p.2
page 3 p.3
page 4 p.4
page 5 p.5
page 6 p.6
page 7 p.7
page 8 p.8
page 9 p.9
page 10 p.10
page 11 p.11
page 12 p.12
page 13 p.13
page 14 p.14
page 15 p.15
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