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Home >  - Circuit Protection - > DIN Rail Circuit Breakers

DIN Rail Miniature Circuit Breakers, MCB

ASI will save you time, space and money when you select our MCB circuit breakers. ASI offers a wide selection, including competitive equivalents and crosses to Allen Bradley® and ABB® MCB circuit breakers. When selecting a DIN breaker, consider where it will be installed. If your need to maximize DIN rail space then opt for the high density 13.5mm MCB breaker. If space is not an issue, the popular 17.5mm wide MCB breaker is suitable.

ASI DIN rail mount, rack and panel mount miniature circuit breakers provide UL1077 supplemental protection, UL489 branch circuit protection, high current circuit protection (up to 125 Amps) and GFCI protection.

ASI-EZ is the place to find high quality circuit breakers without the high cost! Our UL1077 circuit breaker is a MCB miniature circuit breaker used when supplemental protection is required downstream in the power circuit. ASI-EZ has great options to save you money!
Circuit Breakers

NDB2, NDB5, QZ Series
UL1077 series of high current circuit breakers from feature standard DIN rail mounting, shock proof connections, handle up to 125 amps and are available with 1, 2 and 3-poles
High Current
Circuit Breakers

NDM1 Series
Our UL489 Circuit Breaker can save you 25% of DIN rail space. This UL489 circuit breaker is DIN rail mountable and available in standard control trip curves
Circuit Breakers

NDB2T, QL Series
Panel & Rack Mount
Also Available
Our DC Circuit Breakers are a great fit for your next application. If space is an issue, our mini circuit breakers have easy DIN rail mounting and save 30% of space
Circuit Breakers

NDB2Z, NDB5, QY Series
When looking at ground fault circuit breakers, you need quality. Choosing a ground fault breaker from ASI is the first step! Our ground fault circuit breakers provide unparalleled ground fault protection
GFCI Ground Fault
Circuit Breakers

NDB1L Series
Hydraulic magnetic circuit breakers offer a broad range for panel and rack mounting applications. If you don't find the circuit breaker you need, other variations are available
Panel & Rack
Mount Magnetic
Circuit Breakers

NDB3 Series

Circuit Breaker Accessories

Lockout Tagout for your circuit breaker. Save 20% to 50% online with ASI. Buy Direct
Circuit Breaker
Circuit Breaker Busbars. Save 20% to 50% online. Buy Direct
Circuit Breaker
NDB Circuit Breaker Accessories
NDB Circuit Breaker

UL1077 and UL489 (MCB) Circuit Breakers
When looking for a quality, low-cost alternative to ABB® MCB circuit breakers or Allen Bradley®
circuit breakers look no further than ASI. The NDB2-63 series is a UL1077 DIN rail MCB breaker that is
comparable to the ABB® S200 series. The NDB2T series is a UL489 miniature circuit breaker that is
comparable to the current S200UP series and the new SU200M, UL489 ABB® circuit breaker.
If you are currently using Allen Bradley® breakers you will be happy to know that we can save you
money with comparable lower priced DIN rail MCB circuit breakers. The NDB2-63 series from ASI with a
10kA interrupt capacity rating from 1A to 63A is comparable to the 1492-SPM Allen Bradley® circuit
breakers. The NDB2T is the branch circuit UL489 series of mini circuit breakers that is comparable
to the 1489-M series of Allen Bradley® circuit breakers.

Need Help? Have Questions?Talk to an ASI Circuit Breaker Specialist Now.

UL1077 Miniature Circuit Breakers (MCB):

NDB2 Series: Standard UL1077 Miniature Circuit Breaker 18mm
  • 300% factory tested to guarantee you quality and reliability.
  • Visual trip indicator built in to show you when the
    breaker is on.
  • Single, two and three pole circuit breakers available with
    a rated current from 1 to 63 amps. DC Circuit Breakers
    are also available.
  • Shock Proof Connections.
  • RoHs Compliant.
  • Superior 10kA Interrupt Capacity.
UL1077 Miniature Circuit Breaker
NDB5 Series:Economy Series UL1077 Supplementary MCB Circuit Breakers 13mm
  • 300% factory tested to guarantee you quality and reliability.
  • A visual trip indicator is built in to show you when the
    breaker is on.
  • Hydraulic magnetic breaker rated at 1 Amp 240 VAC.
  • Single, two and three pole circuit breakers available with
    a rated current from 1 to 63 amps. DC Circuit Breakers
    are also available.
  • Occupy only 13mm of DIN rail space.
  • RoHs Compliant.
  • Screw clamp connections for easy wiring.
QZ Series: High Density UL1077 Miniature Circuit Breaker (MCB) 13mm
  • Saves you 25% of valuable DIN rail space.
  • Single, double and three pole circuit breakers with current ratings from 1 to 50 Amps.
  • Screw clamp connections for easy wiring.
  • Standard industrial trip curve. Ideal for most applications.
  • Occupy only 13mm of DIN rail space.
NDM1 Series:High Current UL1077 Mini Circuit Breakers (MCB)
  • High current, range from 50 to 125 Amps.
  • 300% factory tested to guarantee you quality and reliability.
  • A visual trip indicator is built in to show you when the
    breaker is on.
  • Screw clamp connections for easy wiring.
  • Superior 10kA Interrupt Capacity.
  • RoHS Compliant.

UL489 Miniature Circuit Breakers:

NDB2T Series: UL489 (MCB) Miniature Branch Circuit Breakers 18mm
  • 300% factory tested to guarantee you quality and reliability.
  • Available in single and two pole versions, ranging from 1 to 25 Amps.
  • Busbar and Lockout/Tagout Accessories Available.
  • Shock Proof Connections.
  • Superior 10kA Interrupt Capacity.

QL Series: UL489 (MCB) Miniature Branch Circuit Breakers 13mm
  • Occupy only 13mm of DIN rail space.
  • Available in single and two pole versions, ranging from 1 to 25 Amps.
  • Shock Proof Connections.
  • DC Circuit Breakers Available (QY Series).

NDB1L Series:
Ground Fault Circuit Breakers

When a ground fault or earth leakage greater than 30mA is detected the NDB1L automatically opens the circuit.

  • Provide dependable ground fault protection on your electrical equipment.
  • UL1053 Recognized
  • Visual Trip Indicator.
Ground Fault Circuit Breakers

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to Learn About Circuit Breaker Selection.
To explore more view the PDF catalog pdficon or request a printed copy.

View Associated Products Below to Complete Your Project

Customers who bought ASI Circuit Breakers Also Saved Time and Money with:

Terminal BlocksSturdy and reliable. ASI offers a complete line of DIN rail Terminal blocks. From single level feed through to high current, find the terminal block for your application.
Switch DisconnectsAvailable in 30 to 100 amp ratings. Panel mount disconnects, face mount disconnects and housing mounted disconnects available.
AC Power OutletsAdd an outlet or GFI protection to any piece of equipment or panel. It's easy. It's fast. It's inexpensive.
Power Distribution Terminal BlocksAvailable in 24, 32 and 41 amp versions. A flexible way to handle power distribution on your DIN Rail.
DIN RailASI DIN rail, all popular sizes available, at very competitive prices
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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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