Introducing the New WEG UMBW Series Thermal-Magnetic
Miniature Circuit Breakers. This new offering includes both
UL489 and UL1077 approvals to provide a solution for circuit &
equipment protection in Industrial Electrical equipment. The
UMBW has a range from 1 to 63Amps, available in 1,2, 3 poles,
and B, C, D trip curves.
Standard Features
• AC & DC voltages available in one Series
• UL489 Branch Circuit protective device
• UL1077 Equipment protection
• 17.5mm width per pole
• Visual status indication
• Positive trip-free snap action mechanism to ensure
reliable switching
• Cuttable Bus Bar connecting system
UMBW Catalog Number Sequence
UMBW-1
-1= UL1077
-4= UL489
Table inte nded a s refe ren ce only a nd not to creat e par t numb ers.
B1-1
B= 4xIn (+/-20% ) Magnetic Trip Current
C= 8xIn (+/-20% ) Magnetic Trip Current
D= 12xIn (+/-20% ) Magnetic Trip Current
1,2,3
Trip Curve
UL1077-1 to 63
UL489-1 to 63
Data is subject to change without notice.
UL10 77
Circuit Protection
UMBW
# PolesAmpacity
1UMBW-1B1-1UMBW-1C1-1UMBW-1D1-1
1.5UMBW-1B1-1.5
2UMBW-1B1-2UMBW-1C1-2UMBW-1D1-2
3UMBW-1B1-3UMBW-1C1-3UMBW-1D1-3
4UMBW-1B1-4UMBW-1C1-4UMBW-1D1-4
5UMBW-1B1-5UMBW-1C1-5UMBW-1D1-5
6UMBW-1B1-6UMBW-1C1-6UMBW-1D1-6
1 POLE
7UMBW-1B1-7
8UMBW-1B1-8
10UMBW-1B1-10UMBW-1C1-10UMBW-1D1-10
12UMBW-1B1-12UMBW-1C1-12UMBW-1D1-12
13UMBW-1B1-13
15UMBW-1B1-15UMBW-1C1-15UMBW-1D1-15
16UMBW-1B1-16UMBW-1C1-16UMBW-1D1-16
20UMBW-1B1-20UMBW-1C1-20UMBW-1D1-20
25UMBW-1B1-25UMBW-1C1-25UMBW-1D1-25
30UMBW-1B1-30
32UMBW-1B1-32UMBW-1C1-32UMBW-1D1-32
35UMBW-1B1-35
40UMBW-1B1-40UMBW-1C1-40UMBW-1D1-40
50UMBW-1B1-50UMBW-1C1-50UMBW-1D1-50
60UMBW-1B1-60
63UMBW-1B1-63UMBW-1C1-63UMBW-1D1-63
1UMBW-1B2-1UMBW-1C2-1UMBW-1D2-1
1.5UMBW-1B2-1.5
2UMBW-1B2-2UMBW-1C2-2UMBW-1D2-2
3UMBW-1B2-3UMBW-1C2-3UMBW-1D2-3
4UMBW-1B2-4UMBW-1C2-4UMBW-1D2-4
2 POLE
5UMBW-1B2-5UMBW-1C2-5UMBW-1D2-5
6UMBW-1B2-6UMBW-1C2-6UMBW-1D2-6
7UMBW-1B2-7
8UMBW-1B2-8
10UMBW-1B2-10UMBW-1C2-10UMBW-1D2-10
12UMBW-1B2-12UMBW-1C2-12UMBW-1D2-12
13UMBW-1B2-13
15UMBW-1B2-15
16UMBW-1B2-16UMBW-1C2-16UMBW-1D2-16
20UMBW-1B2-20UMBW-1C2-20UMBW-1D2-20
25UMBW-1B2-25UMBW-1C2-25UMBW-1D2-25
30UMBW-1B2-30
32UMBW-1B2-32UMBW-1C2-32UMBW-1D2-32
35UMBW-1B2-35
40UMBW-1B2-40UMBW-1C2-40UMBW-1D2-40
50UMBW-1B2-50UMBW-1C2-50UMBW-1D2-50
60UMBW-1B2-60
63UMBW-1B2-63UMBW-1C2-63UMBW-1D2-63
1) Non-stocked. Contact WEG for availability.
Data is subject to change without notice.
Catalog Number
B CURVE C CURVE D CURVE
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
UMBW-1C1-1.5
UMBW-1C1-7
UMBW-1C1-8
UMBW-1C1-13
UMBW-1C1-30
UMBW-1C1-35
UMBW-1C1-60
UMBW-1C2-1.5
UMBW-1C2-7
UMBW-1C2-8
UMBW-1C2-13
UMBW-1C2-15
UMBW-1C2-30
UMBW-1C2-35
UMBW-1C2-60
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
UMBW-1D1-1.5
UMBW-1D1-7
UMBW-1D1-8
UMBW-1D1-13
UMBW-1D1-30
UMBW-1D1-35
UMBW-1D1-60
UMBW-1D2-1.5
UMBW-1D2-7
UMBW-1D2-8
UMBW-1D2-13
UMBW-1D2-15
UMBW-1D2-30
UMBW-1D2-35
UMBW-1D2-60
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Max Voltage
277 VAC
277/480 VAC
Data is subject to change without notice.
Circuit Protection
UMBW
UL10 77
# PolesAmpacity
3 POLE
1) Non-stocked. Contact WEG for availability.
Catalog Number
B CURVE C CURVE D CURVE
1UMBW-1B3-1UMBW-1C3-1UMBW-1D3-1
1.5UMBW-1B3-1.5
1
UMBW-1C3-1.5
1
UMBW-1D3-1.5
2UMBW-1B3-2UMBW-1C3-2UMBW-1D3-2
3UMBW-1B3-3
1
UMBW-1C3-3
1
UMBW-1D3-3
4UMBW-1B3-4UMBW-1C3-4UMBW-1D3-4
5UMBW-1B3-5
1
UMBW-1C3-5
1
UMBW-1D3-5
6UMBW-1B3-6UMBW-1C3-6UMBW-1D3-6
7UMBW-1B3-7
8UMBW-1B3-8
1
1
UMBW-1C3-7
UMBW-1C3-8
1
1
UMBW-1D3-7
UMBW-1D3-8
10UMBW-1B3-10UMBW-1C3-10UMBW-1D3-10
12UMBW-1B3-12
13UMBW-1B3-13
15UMBW-1B3-15
1
1
1
UMBW-1C3-12
UMBW-1C3-13
UMBW-1C3-15
1
1
1
UMBW-1D3-12
UMBW-1D3-13
UMBW-1D3-15
16UMBW-1B3-16UMBW-1C3-16UMBW-1D3-16
20UMBW-1B3-20UMBW-1C3-20UMBW-1D3-20
25UMBW-1B3-25UMBW-1C3-25UMBW-1D3-25
30UMBW-1B3-30
1
UMBW-1C3-30
1
UMBW-1D3-30
32UMBW-1B3-32UMBW-1C3-32UMBW-1D3-32
35UMBW-1B3-35
1
UMBW-1C3-35
1
UMBW-1D3-35
40UMBW-1B3-40UMBW-1C3-40UMBW-1D3-40
50UMBW-1B3-50UMBW-1C3-50UMBW-1D3-50
60UMBW-1B3-60
1
UMBW-1C3-60
1
UMBW-1D3-60
63UMBW-1B3-63UMBW-1C3-63UMBW-1D3-63
1
1
1
1
1
1
1
1
1
1
1
Max Voltage
277/480 VAC
Circuit Protection
UL489
# PolesAmpacity
1UMBW-4B1-1UMBW-4C1-1UMBW-4D1-1
1.5UMBW-4B1-1.5
2UMBW-4B1-2
3UMBW-4B1-3
4UMBW-4B1-4UMBW-4C1-4UMBW-4D1-4
5UMBW-4B1-5
6UMBW-4B1-6UMBW-4C1-6UMBW-4D1-6
1 POLE
2 POLE
1) Non-stocked. Contact WEG for availability.
Data is subject to change without notice.
7UMBW-4B1-7
8UMBW-4B1-8
10UMBW-4B1-10UMBW-4C1-10UMBW-4D1-10
12UMBW-4B1-12
13UMBW-4B1-13
15UMBW-4B1-15UMBW-4C1-15
16UMBW-4B1-16UMBW-4C1-16UMBW-4D1-16
20UMBW-4B1-20UMBW-4C1-20UMBW-4D1-20
25UMBW-4B1-25UMBW-4C1-25UMBW-4D1-25
30UMBW-4B1-30
32UMBW-4B1-32UMBW-4C1-32UMBW-4D1-32
35UMBW-4B1-35
40UMBW-4B1-40
50UMBW-4B1-50
60UMBW-4B1-60
63UMBW-4B1-63
1UMBW-4B2-1UMBW-4C2-1UMBW-4D2-1
1.5UMBW-4B2-1.5
2UMBW-4B2-2UMBW-4C2-2UMBW-4D2-2
3UMBW-4B2-3
4UMBW-4B2-4UMBW-4C2-4UMBW-4D2-4
5UMBW-4B2-5UMBW-4C2-5UMBW-4D2-5
6UMBW-4B2-6UMBW-4C2-6UMBW-4D2-6
7UMBW-4B2-7
8UMBW-4B2-8
10UMBW-4B2-10UMBW-4C2-10UMBW-4D2-10
12UMBW-4B2-12UMBW-4C2-12UMBW-4D2-12
13UMBW-4B2-13
15UMBW-4B2-15
16UMBW-4B2-16UMBW-4C2-16UMBW-4D2-16
20UMBW-4B2-20UMBW-4C2-20UMBW-4D2-20
25UMBW-4B2-25UMBW-4C2-25UMBW-4D2-25
30UMBW-4B2-30
32UMBW-4B2-32UMBW-4C2-32UMBW-4D2-32
35UMBW-4B2-35
40UMBW-4B2-40
50UMBW-4B2-50
60UMBW-4B2-60
63UMBW-4B2-63
Catalog Number
B CURVE C CURVE D CURVE
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
UMBW-4C1-1.5
UMBW-4C1-2UMBW-4D1-2
UMBW-4C1-3
UMBW-4C1-5
UMBW-4C1-7
UMBW-4C1-8
UMBW-4C1-12
UMBW-4C1-13
UMBW-4C1-30
UMBW-4C1-35
UMBW-4C1-40
UMBW-4C1-50
UMBW-4C1-60
UMBW-4C1-63
UMBW-4C2-1.5
UMBW-4C2-3
UMBW-4C2-7
UMBW-4C2-8
UMBW-4C2-13
UMBW-4C2-15
UMBW-4C2-30
UMBW-4C2-35
UMBW-4C2-40
UMBW-4C2-50
UMBW-4C2-60
UMBW-4C2-63
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
UMBW-4D1-1.5
UMBW-4D1-3
UMBW-4D1-5
UMBW-4D1-7
UMBW-4D1-8
UMBW-4D1-12
UMBW-4D1-13
UMBW-4D1-15
UMBW-4D1-30
UMBW-4D1-35
UMBW-4D1-40
UMBW-4D1-50
UMBW-4D1-60
UMBW-4D1-63
UMBW-4D2-1.5
UMBW-4D2-3
UMBW-4D2-7
UMBW-4D2-8
UMBW-4D2-13
UMBW-4D2-15
UMBW-4D2-30
UMBW-4D2-35
UMBW-4D2-40
UMBW-4D2-50
UMBW-4D2-60
UMBW-4D2-63
Max Voltage
1
1
1
1
1
1
1
1
277 VAC /60 VDC
1
1
1
1
120 VAC /60 VDC
1
1
1
1
1
277/480 VAC 125 VDC
1
1
1
1
277/480 VAC 125 VDC
1
1
1
1
UMBW
Data is subject to change without notice.
Circuit Protection
UMBW
UL489
# PolesAmpacity
3 POLE
1) Non-stocked. Contact WEG for availability.
Catalog Number
B CURVE C CURVE D CURVE
1UMBW-4B3-1UMBW-4C3-1UMBW-4D3-1
1.5UMBW-4B3-1.5
1
UMBW-4C3-1.5
1
UMBW-4D3-1.5
2UMBW-4B3-2UMBW-4C3-2UMBW-4D3-2
3UMBW-4B3-3
1
UMBW-4C3-3
1
UMBW-4D3-3
4UMBW-4B3-4UMBW-4C3-4UMBW-4D3-4
5UMBW-4B3-5UMBW-4C3-5UMBW-4D3-5
6UMBW-4B3-6UMBW-4C3-6UMBW-4D3-6
7UMBW-4B3-7
8UMBW-4B3-8
1
1
UMBW-4C3-7
UMBW-4C3-8UMBW-4D3-8
1
UMBW-4D3-7
10UMBW-4B3-10UMBW-4C3-10UMBW-4D3-10
12UMBW-4B3-12
13UMBW-4B3-13
1
1
UMBW-4C3-12
UMBW-4C3-13
1
1
UMBW-4D3-12
UMBW-4D3-13
15UMBW-4B3-15UMBW-4C3-15UMBW-4D3-15
16UMBW-4B3-16UMBW-4C3-16UMBW-4D3-16
20UMBW-4B3-20UMBW-4C3-20UMBW-4D3-20
25UMBW-4B3-25UMBW-4C3-25UMBW-4D3-25
30UMBW-4B3-30
1
UMBW-4C3-30
1
UMBW-4D3-30
32UMBW-4B3-32UMBW-4C3-32UMBW-4D3-32
35UMBW-4B3-35
40UMBW-4B3-40
50UMBW-4B3-50
60UMBW-4B3-60
63UMBW-4B3-63
1
1
1
1
1
UMBW-4C3-35
UMBW-4C3-40
UMBW-4C3-50
UMBW-4C3-60
UMBW-4C3-63
1
1
1
1
1
UMBW-4D3-35
UMBW-4D3-40
UMBW-4D3-50
UMBW-4D3-60
UMBW-4D3-63
Max Voltage
1
1
1
277/480 VAC 125 VDC
1
1
1
1
240 VAC / 125 VDC
1
1
1
1
Circuit Protection
UMBW
Miniature Circuit Breakers
Accessories
Auxiliary Contact1NO/1NC
Shunt Trip120,240,277AC…12,24,48,125DC
Bell Alarm1NO/1NC
Bus Bar1,2,3 Phase…1,2,3 Phase with Auxiliary
Auxiliary Contacts
Signaling contacts that open and close with the breaker. Provide remote status indicating ON and OFF only.
For Use
With
UMBW-1
UMBW-4
Catalog Number
UMBW-AUX
Bell Alarm
Provides provisions for visual and alarm indication when the breaker in the Tripped status, due to Short
Circuit, Overload or Undervoltage. Breaker must be re-set to open contacts.
For Use
With
UMBW-1
UMBW-4
Catalog Number
UMBW-BAC
Operating
Voltage
12-240VAC 6A
277VAC3A
12-24VDC6A
48VDC3A
110-220VDC1.5A
Operating
Voltage
12-240VAC6A
277VAC3A
12-24VDC6A
48VDC3A
110-220VDC1.5A
Operating
Amperage
Operating
Amperage
Contacts Mounting/Dims (mm)
1NO/1NC
Contacts Mounting/Dims (mm)
1NO/1NC
Field Mountable..Left
Side/ 9mm
Field Mountable..Left
Side/ 9mm
Mechanical
Operations
20,000
Mechanical
Operations
10,000
TorqueMass
1 Nm .74
Ft. lbs.
TorqueMass
1 Nm .74
Ft. lbs.
29g
29g
Shunt Trip
Provides ability to trip breaker from remote location when power is applied.
For Use
With
Catalog Number
UMBW-ST12DC
UMBW-ST24DC
UMBW-ST48DC
UMBW-1
UMBW-4
UMBW-ST125DC
UMBW-ST120AC
UMBW-ST240AC
UMBW-ST277AC
Data is subject to change without notice.
Voltage/Min
Trip Voltage
12 VDC/
8VDC
24 VDC/
16VDC
48 VDC/
24VDC
125 VDC/
80VDC
120 VAC/
80VAC
240 VAC/
160VAC
277 VAC/
160VAC
Amperage/
Power Con-
suption
6A/ 200W
6A/ 200W
2A/ 200W
1.5A/ 200W
6A/ 200W
6A/ 200W
3A/ 200W
Contacts Mounting/Dims (mm)
1NO/1NC
Field Mountable..Left
Side/18mm
Mechanical
Operations
20,000
TorqueMass
1Nm,
.74ft lbs
60g
Data is subject to change without notice.
Circuit Protection
UMBW
Minature Circuit Breakers
Bus Bar Accessories
For Use
With
1 Pole
UMBW-1
Catalog
Number
UMBW-BB-1-1
AMP
Rating
End/
Center
80A/160A57
Number
of Poles
Max
Voltage
600 AC
/1000 DC
Length
End Cap Catalog Number
(mm)
1009UMBW-BB-1-1P-END CAP
(Sold as Seprate Item)
UMBW-4
1 Pole with Auxiliary
UMBW-1
UMBW-4
2 POLE
UMBW-1
UMBW-4
2 Pole with Auxiliary
UMBW-1
UMBW-4
3 Pole
UMBW-1
UMBW-BB-4-1
UMBW-BB-1-1A
UMBW-BB-4-1A
UMBW-BB-1-2
UMBW-BB-4-2
UMBW-BB-1-2A
UMBW-BB-4-2A
UMBW-BB-1-3
80A/160A571000 AC/DC1031UMBW-BB-4-END CAP
80A/160A37
80A/160A371000 AC/DC972UMBW-BB-4-END CAP
80A/160A56600 AC/DC991UMBW-BB-1-2/3P-E CAP
80A/160A56600 AC/DC979UMBW-BB-4-END CAP
80A/160A46600 AC/DC1009UMBW-BB-1-2/3P-E CAP
80A/160A46600 AC/DC981UMBW-BB-4-END CAP
80A/160A57600 AC/DC1009
600 AC
/1000 DC
985UMBW-BB-1-1P-END CAP
UMBW-BB-1-2/3P-E CAP
UMBW-4
3 Pole with Auxiliary
UMBW-1
UMBW-4
Note: Bus Bars May Be Center Fed to Increase A mpacity to D ouble Rated Value