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Home >  UL1077 Supplementary Circuit Breakers > Standard UL1077 Circuit Breakers

Standard UL1077 MCB Circuit Breakers
DIN Rail Mount

Click Here For the 1, 2 & 3 Pole Breaker Sections Below
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1-Pole, C Curve
1-Pole, D Curve
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2-Pole, B Curve
2-Pole, C Curve
2-Pole, D Curve
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3-Pole, B Curve
3-Pole, C Curve
3-Pole, D Curve



ASI's best selling UL1077 MCB Circuit Breakers provide proven supplementary protection for downstream applications. They are tested 300% (3 times at 100%) and are designed to protect the cable or wire in the event of an overvoltage or undervoltage or short circuit. The NDB2 UL1077/ CSA C22.2 No. 235 miniature circuit breakers offer superior 10kA interrupt capacity, are available in 1, 2 and 3 poles, are 18mm wide, range from 1 to 63 amps, offer C and D Trip Curves, have visual trip indication, and are RoHS compliant.

Please note that NDB2T UL489 circuit breakers may be substituted for NDB2 UL1077 circuit breakers. So if you need more of a particular NDB2, please shop NDB2T UL489 circuit breakers for a substitute.

View Associated Products Below to Complete Your Project
Catalog No. / Description 
 One Pole- C Trip CurveNext | Top 
NDB2-63C1-1 Product
Standard DIN Rail Mounted AC Circuit Breaker
  • Superior 10kA Interrupt Capacity
  • DIN Rail Mounting
  • One, Two and Three Pole Versions
  • UL1077
  • Easy to Wire, Screw-Clamp Connections
Use 
 below to check stock
Standard DIN Rail Mounted AC Circuit Breaker, 1 pole, UL1077, 1 A, 240 Vac, C Trip Curve 
$7.84 each
1      $7.84 Each

12      $6.97 Each

60      $6.28 Each

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60+ units saves 20% 
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50 A, C Trip Curve 
$7.84 each
1      $7.84 Each

12      $6.97 Each

60      $6.28 Each

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60+ units saves 20% 
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2 A, C Trip Curve 
$7.84 each
1      $7.84 Each

12      $6.97 Each

60      $6.28 Each

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60+ units saves 20% 
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Green Check In Stock
4 A, C Trip Curve 
$7.84 each
1      $7.84 Each

12      $6.97 Each

60      $6.28 Each

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60+ units saves 20% 
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Green Check In Stock
6 A, C Trip Curve 
$7.84 each
1      $7.84 Each

12      $6.97 Each

60      $6.28 Each

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60+ units saves 20% 
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Green Check In Stock
10 A, C Trip Curve 
$7.31 each
1      $7.31 Each

12      $6.50 Each

60      $5.85 Each

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60+ units saves 20% 
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Green Check In Stock
16 A, C Trip Curve 
$7.31 each
1      $7.31 Each

12      $6.50 Each

60      $5.85 Each

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60+ units saves 20% 
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Green Check In Stock
20 A, C Trip Curve 
$7.31 each
1      $7.31 Each

12      $6.50 Each

60      $5.85 Each

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60+ units saves 20% 
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Green Check In Stock
25 A, C Trip Curve 
$7.44 each
1      $7.44 Each

12      $6.61 Each

60      $5.95 Each

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60+ units saves 20% 
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Green Check In Stock
32 A, C Trip Curve 
$7.44 each
1      $7.44 Each

12      $6.61 Each

60      $5.95 Each

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60+ units saves 20% 
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Green Check In Stock
40 A, C Trip Curve 
$7.84 each
1      $7.84 Each

12      $6.97 Each

60      $6.28 Each

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60+ units saves 20% 
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Green Check In Stock
63 A, C Trip Curve 
$8.72 each
1      $8.72 Each

12      $7.75 Each

60      $6.98 Each

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60+ units saves 20% 
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 One Pole - D Trip CurveNext | Top 
NDB2-63D1-1 Product
Standard DIN Rail Mounted AC Circuit Breaker
  • Superior 10kA Interrupt Capacity
  • Time delay, for use with high inrush loads
  • DIN Rail Mounting
  • One, Two and Three Pole Versions
  • UL1077
  • Easy-to-Wire, Screw-Clamp Connections
Use 
 below to check stock
1 pole, UL1077, 1 A, 240 Vac, D Trip Curve 
$9.81 each
1      $9.81 Each

12      $8.72 Each

60      $7.85 Each

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240V DIN Rail Circuit Breaker, 2 Amp, 240 Vac, D Trip Curve, 18-2 AWG, 10kA interrupt capacity, UL1077 Recognized, 18mm wide 
$9.81 each
1      $9.81 Each

12      $8.72 Each

60      $7.85 Each

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60+ units saves 20% 
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Standard DIN Rail Mounted AC Circuit Breaker, UL1077, 4 A, 240 Vac, D Trip Curve 
$9.81 each
1      $9.81 Each

12      $8.72 Each

60      $7.85 Each

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60+ units saves 20% 
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6A, D Trip Curve 
$9.50 each
1      $9.50 Each

12      $8.44 Each

60      $7.60 Each

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60+ units saves 20% 
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Green Check In Stock
10 A, D Trip Curve 
$8.50 each
1      $8.50 Each

12      $7.56 Each

60      $6.80 Each

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60+ units saves 20% 
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Green Check In Stock
20 A, D Trip Curve 
$8.50 each
1      $8.50 Each

12      $7.56 Each

60      $6.80 Each

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60+ units saves 20% 
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Green Check In Stock
25 A, D Trip Curve 
$8.81 each
1      $8.81 Each

12      $7.83 Each

60      $7.05 Each

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60+ units saves 20% 
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Green Check In Stock
32 A, D Trip Curve 
$8.81 each
1      $8.81 Each

12      $7.83 Each

60      $7.05 Each

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60+ units saves 20% 
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Green Check In Stock
40 A, D Trip Curve 
$10.44 each
1      $10.44 Each

12      $9.28 Each

60      $8.35 Each

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60+ units saves 20% 
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Green Check In Stock
50 A, D Trip Curve 
$10.00 each
1      $10.00 Each

12      $8.89 Each

60      $8.00 Each

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60+ units saves 20% 
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Green Check In Stock
63 A, D Trip Curve 
$10.88 each
1      $10.88 Each

12      $9.67 Each

60      $8.70 Each

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60+ units saves 20% 
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 Two Pole - C Trip CurveNext | Top 
NDB2-63C1-2 Product
Standard DIN Rail Mounted AC Circuit Breaker
  • Superior 10kA Interrupt Capacity
  • DIN Rail Mounting
  • One, Two and Three Pole Versions
  • UL1077
  • Easy to Wire, Screw-Clamp Connections
Use 
 below to check stock
2 pole, UL1077 , 1 A, 240/480 Vac, C Trip Curve 
$18.09 each
1      $18.09 Each

6      $16.08 Each

30      $14.48 Each

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30+ units saves 20% 
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Green Check In Stock
2 A, C Trip Curve 
$18.09 each
1      $18.09 Each

6      $16.08 Each

30      $14.48 Each

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30+ units saves 20% 
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Green Check In Stock
4 A, C Trip Curve 
$18.09 each
1      $18.09 Each

6      $16.08 Each

30      $14.48 Each

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30+ units saves 20% 
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Green Check In Stock
6 A, C Trip Curve 
$18.63 each
1      $18.63 Each

6      $16.56 Each

30      $14.90 Each

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30+ units saves 20% 
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Green Check In Stock
10 A, C Trip Curve 
$17.28 each
1      $17.28 Each

6      $15.36 Each

30      $13.83 Each

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30+ units saves 20% 
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Green Check In Stock
16 A, C Trip Curve 
$17.28 each
1      $17.28 Each

6      $15.36 Each

30      $13.83 Each

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30+ units saves 20% 
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Green Check In Stock
Miniature Circuit Breaker, 20 A, DIN Rail Mounted 
$17.28 each
1      $17.28 Each

6      $15.36 Each

30      $13.83 Each

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30+ units saves 20% 
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Green Check In Stock
Standard DIN Rail Mounted AC Circuit Breaker, 25 A, C Trip Curve 
$17.53 each
1      $17.53 Each

6      $15.58 Each

30      $14.03 Each

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30+ units saves 20% 
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Green Check In Stock
32 A, C Trip Curve 
$17.53 each
1      $17.53 Each

6      $15.58 Each

30      $14.03 Each

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30+ units saves 20% 
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Green Check In Stock
40 A, C Trip Curve 
$18.94 each
1      $18.94 Each

6      $16.83 Each

30      $15.15 Each

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30+ units saves 20% 
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Green Check In Stock
50 A, C Trip Curve 
$17.69 each
1      $17.69 Each

6      $15.72 Each

30      $14.15 Each

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30+ units saves 20% 
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Green Check In Stock
63 A, C Trip Curve 
$19.06 each
1      $19.06 Each

6      $16.94 Each

30      $15.25 Each

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30+ units saves 20% 
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Green Check In Stock
 2 Pole- B Trip Curve Next | Top 
NDB2-63B10-2 Product
Standard DIN Rail Mounted AC Circuit Breaker
  • Superior 10kA Interrupt Capacity
  • DIN Rail Mounting
  • One, Two and Three Pole Versions
  • UL1077
  • Easy to Wire, Screw-Clamp Connections
Use 
 below to check stock
2 pole, UL1077, 10 A, 240/480 Vac, B Trip Curve 
$17.28 each
1      $17.28 Each

Need More >> Call For Quote
 
Buy: units
Closeout Item
 Two Pole - D Trip CurveNext | Top 
NDB2-63D1-2 Product
Standard DIN Rail Mounted AC Circuit Breaker
  • Superior 10kA Interrupt Capacity
  • Time delay, for use with high inrush loads
  • DIN Rail Mounting
  • One, Two and Three Pole Versions
  • UL1077
  • Easy-to-Wire, Screw-Clamp Connections
Use 
 below to check stock
2 pole, UL1077 , 1 A, 240/480 Vac, D Trip Curve 
$21.25 each
1      $21.25 Each

6      $18.89 Each

30      $17.00 Each

Need More >> Call For Quote
30+ units saves 20% 
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Green Check In Stock
2 A, D Trip Curve 
$21.25 each
1      $21.25 Each

6      $18.89 Each

30      $17.00 Each

Need More >> Call For Quote
30+ units saves 20% 
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Green Check In Stock
4 A, D Trip Curve 
$21.25 each
1      $21.25 Each

6      $18.89 Each

30      $17.00 Each

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30+ units saves 20% 
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Green Check In Stock
6 A, D Trip Curve 
$22.88 each
1      $22.88 Each

6      $20.33 Each

30      $18.30 Each

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30+ units saves 20% 
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Green Check In Stock
10 A, D Trip Curve 
$20.16 each
1      $20.16 Each

6      $17.92 Each

30      $16.13 Each

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30+ units saves 20% 
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Green Check In Stock
16 A, D Trip Curve 
$25.72 each
1      $25.72 Each

6      $22.86 Each

30      $20.58 Each

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30+ units saves 20% 
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Green Check In Stock
20 A, D Trip Curve 
$20.16 each
1      $20.16 Each

6      $17.92 Each

30      $16.13 Each

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30+ units saves 20% 
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Green Check In Stock
25 A, D Trip Curve 
$20.91 each
1      $20.91 Each

6      $18.58 Each

30      $16.73 Each

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30+ units saves 20% 
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Green Check In Stock
32 A, D Trip Curve 
$20.91 each
1      $20.91 Each

6      $18.58 Each

30      $16.73 Each

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30+ units saves 20% 
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Green Check In Stock
40 A, D Trip Curve 
$23.22 each
1      $23.22 Each

6      $20.64 Each

30      $18.58 Each

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30+ units saves 20% 
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Green Check In Stock
50 A, D Trip Curve 
$21.25 each
1      $21.25 Each

6      $18.89 Each

30      $17.00 Each

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30+ units saves 20% 
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Green Check In Stock
63 A, D Trip Curve 
$22.59 each
1      $22.59 Each

6      $20.08 Each

30      $18.08 Each

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30+ units saves 20% 
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Green Check In Stock
 Three Pole- B Trip CurveNext | Top 
NDB2-63B4-3 Product
Standard DIN Rail Mounted AC Circuit Breaker
  • Superior 10kA Interrupt Capacity
  • DIN Rail Mounting
  • One, Two and Three Pole Versions
  • UL1077
  • Easy to Wire, Screw-Clamp Connections
Use 
 below to check stock
3 pole, UL1077, 4 A, 240/480 Vac, B Trip Curve 
$26.41 each
1      $26.41 Each

4      $23.47 Each

20      $21.13 Each

Need More >> Call For Quote
20+ units saves 20% 
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Green Check In Stock
 Three Pole- C Trip CurveNext | Top 
NDB2-63C1-3 Product
Standard DIN Rail Mounted AC Circuit Breaker
  • Superior 10kA Interrupt Capacity
  • DIN Rail Mounting
  • One, Two and Three Pole Versions
  • UL1077
  • Easy to Wire, Screw-Clamp Connections
Use 
 below to check stock
3 pole, UL1077 , 1 A, 240/480 Vac, C Trip Curve 
$26.41 each
1      $26.41 Each

4      $23.47 Each

20      $21.13 Each

Need More >> Call For Quote
20+ units saves 20% 
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Green Check In Stock
2 A, C Trip Curve 
$26.41 each
1      $26.41 Each

4      $23.47 Each

20      $21.13 Each

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20+ units saves 20% 
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Green Check In Stock
4 A, C Trip Curve 
$26.41 each
1      $26.41 Each

4      $23.47 Each

20      $21.13 Each

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20+ units saves 20% 
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Green Check In Stock
6 A, C Trip Curve 
$27.09 each
1      $27.09 Each

4      $24.08 Each

20      $21.68 Each

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20+ units saves 20% 
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Green Check In Stock
10 A, C Trip Curve 
$27.50 each
1      $27.50 Each

4      $24.44 Each

20      $22.00 Each

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20+ units saves 20% 
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Green Check In Stock
16 A, C Trip Curve 
$27.50 each
1      $27.50 Each

4      $24.44 Each

20      $22.00 Each

Need More >> Call For Quote
20+ units saves 20% 
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Green Check In Stock
20 A, C Trip Curve 
$27.50 each
1      $27.50 Each

4      $24.44 Each

20      $22.00 Each

Need More >> Call For Quote
20+ units saves 20% 
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Green Check In Stock
25 A, C Trip Curve 
$27.63 each
1      $27.63 Each

4      $24.56 Each

20      $22.10 Each

Need More >> Call For Quote
20+ units saves 20% 
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Green Check In Stock
32 A, C Trip Curve 
$27.63 each
1      $27.63 Each

4      $24.56 Each

20      $22.10 Each

Need More >> Call For Quote
20+ units saves 20% 
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Green Check In Stock
40 A, C Trip Curve 
$28.09 each
1      $28.09 Each

4      $24.97 Each

20      $22.48 Each

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20+ units saves 20% 
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Green Check In Stock
50 A, C Trip Curve 
$28.09 each
1      $28.09 Each

4      $24.97 Each

20      $22.48 Each

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20+ units saves 20% 
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Green Check In Stock
63 A, C Trip Curve 
$28.31 each
1      $28.31 Each

4      $25.17 Each

20      $22.65 Each

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20+ units saves 20% 
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Green Check In Stock
 Three Pole - D Trip CurveNext | Top 
NDB2-63D1-3 Product
Standard DIN Rail Mounted AC Circuit Breaker
  • Superior 10kA Interrupt Capacity
  • DIN Rail Mounting
  • One, Two and Three Pole Versions
  • UL1077
  • Easy to Wire, Screw-Clamp Connections
Use 
 below to check stock
3 pole, UL1077 , 1 A, 240/480 Vac, D Trip Curve 
$32.13 each
1      $32.13 Each

4      $28.56 Each

20      $25.70 Each

Need More >> Call For Quote
20+ units saves 20% 
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Green Check In Stock
2 A, D Trip Curve 
$32.13 each
1      $32.13 Each

4      $28.56 Each

20      $25.70 Each

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20+ units saves 20% 
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Green Check In Stock
4 A, D Trip Curve 
$32.13 each
1      $32.13 Each

4      $28.56 Each

20      $25.70 Each

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20+ units saves 20% 
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Green Check In Stock
6 A, D Trip Curve 
$31.66 each
1      $31.66 Each

4      $28.14 Each

20      $25.33 Each

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20+ units saves 20% 
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Green Check In Stock
10 A, D Trip Curve 
$30.44 each
1      $30.44 Each

4      $27.06 Each

20      $24.35 Each

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20+ units saves 20% 
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Green Check In Stock
16 A, D Trip Curve 
$30.44 each
1      $30.44 Each

4      $27.06 Each

20      $24.35 Each

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20+ units saves 20% 
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Green Check In Stock
20 A, D Trip Curve 
$30.44 each
1      $30.44 Each

4      $27.06 Each

20      $24.35 Each

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20+ units saves 20% 
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Green Check In Stock
25 A, D Trip Curve 
$31.38 each
1      $31.38 Each

4      $27.89 Each

20      $25.10 Each

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20+ units saves 20% 
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Green Check In Stock
32 A, D Trip Curve 
$31.38 each
1      $31.38 Each

4      $27.89 Each

20      $25.10 Each

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20+ units saves 20% 
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Closeout Item
40 A, D Trip Curve 
$31.66 each
1      $31.66 Each

4      $28.14 Each

20      $25.33 Each

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20+ units saves 20% 
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Green Check In Stock
50 A, D Trip Curve 
$29.41 each
1      $29.41 Each

4      $26.14 Each

20      $23.53 Each

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20+ units saves 20% 
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Green Check In Stock
63 A, D Trip Curve 
$31.28 each
1      $31.28 Each

4      $27.81 Each

20      $25.03 Each

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Automation Systems Interconnect, Inc.
4700 Westport Drive, Suite 500  | Mechanicsburg, PA 17055
REMIT-TO: P.O. Box 1340 | Mechanicsburg, PA 17055
Toll-Free: 877-650-5160 | 717-249-5581 | 717-249-5542 Fax
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