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HomeProductsCircuit ProtectionCircuit BreakersBB2-A0-03-650-521-C
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BB2-A0-03-650-521-C - Carling Technologies

Manufacturer Part Number
BB2-A0-03-650-521-C
Manufacturer
Carling Technologies
Allelco Part Number
98D-BB2-A0-03-650-521-C
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
47,292 pcs available, New & Original
Parts Description
CIRCUIT BREAKER
Package
Bulk
Data sheet
BB2-A0-03-650-5.pdf

Datasheets

B-Series.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 47292
  • Unit Price: $93.915
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $93.915 $93.92
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

BB2-A0-03-650-521-C Tech Specifications
Carling Technologies - BB2-A0-03-650-521-C technical specifications, attributes, parameters and parts with similar specifications to Carling Technologies - BB2-A0-03-650-521-C

Product Attribute Attribute Value
Manufacturer Carling Technologies
Voltage Rating - DC 80 V
Voltage Rating - AC 277 V
Series B
Package Bulk
Number of Poles 2
Mounting Type Panel Mount
Product Attribute Attribute Value
Illumination Voltage (Nominal) -
Illumination None
Current Rating (Amps) 50A
Breaker Type Switch Only
Approval Agency CCC, CSA, UL
Actuator Type Lever

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8536.20.0020

Frequently Asked Questions(FAQ)

What are the key electrical and environmental constraints when integrating the BB2-A0-03-650-521-C circuit breaker into a high-reliability industrial control system operating in variable ambient temperatures?
The BB2-A0-03-650-521-C is rated for 50A continuous current at 277V AC and 80V DC, with a two-pole configuration suitable for dual-circuit protection. When deployed in environments where ambient temperature fluctuates significantly—such as HVAC systems or outdoor enclosures—the derating curve must be considered. For every 10°C above 25°C, the maximum allowable current decreases by approximately 2–3%, necessitating thermal management strategies like forced airflow or heat sinks. Additionally, mechanical stress from thermal cycling can affect the lever actuator’s contact integrity over time; therefore, mounting hardware should allow for slight expansion without compromising panel seal or contact pressure.
How does the BB2-A0-03-650-521-C compare to similarly rated push-button style breakers in terms of response time and fault interruption capability under inductive load conditions?
Unlike push-button circuit breakers that require manual reset after tripping, the BB2-A0-03-650-521-C uses a lever-actuated mechanism designed for repeated operation without user intervention. In terms of performance, its interruption rating of 10 kA symmetrical at 277V AC ensures reliable disconnection during fault events, including those involving inductive loads such as motors or transformers. However, due to slower mechanical response compared to electronic trip units, the total clearing time may extend by 10–20 ms under high-current transients. This makes it less ideal than solid-state or magnetic-hydraulic breakers for applications requiring sub-cycle fault isolation, but more robust in harsh environments where contamination or vibration could compromise electronic components.
Can the BB2-A0-03-650-521-C be used in DC applications above 48V without additional protective circuitry, and what arc suppression considerations apply?
While the BB2-A0-03-650-521-C is rated up to 80V DC, interrupting DC currents poses greater challenges due to sustained arcing across contacts compared to AC zero-crossing behavior. At voltages above 48V DC—especially near the upper limit—extending arc duration increases contact erosion and reduces lifespan. For DC loads exceeding 30A or 48V, supplemental arc suppression methods such as snubber circuits or RC networks across the load terminals are recommended. Alternatively, using the breaker only for AC mains with a downstream DC-DC converter limits exposure to DC fault conditions. Direct use above 60V DC without mitigation risks premature failure even if the nominal voltage appears within specification.
What panel cutout dimensions and mechanical clearances are required when installing the BB2-A0-03-650-521-C in a NEMA 4X enclosure subject to vibration per IEC 60068-2-6?
The BB2-A0-03-650-521-C features a standard rectangular panel mount with a footprint defined by its series profile. Exact cutout dimensions should be verified against the latest dimensional drawing from Carling Technologies, but typically it requires a 1.5" × 2.5" opening with chamfered edges to accommodate mounting tabs. Mechanical clearance around the actuator arm is critical: at least 0.25 inches on all sides to prevent interference with adjacent components during operation. In vibration-prone environments, the panel should be reinforced with stiffeners, and the breaker secured using locking fasteners (e.g., captive screws) rather than standard hex nuts. Failure to maintain these tolerances may lead to misalignment, increased contact resistance, or unintended actuation during transit.
Does the lack of illumination in the BB2-A0-03-650-521-C impact diagnostic capabilities in low-light industrial settings, and are there compatible retrofit options?
The BB2-A0-03-650-521-C has no integrated LED or indicator light, which limits visual confirmation of ON/OFF status in dimly lit control panels or remote installations. For mission-critical systems where operator awareness is essential, consider adding an external status relay driven by the breaker’s auxiliary contacts (available on some variants of the B Series). Alternatively, adjacent pilot lights powered from the same supply can provide situational awareness. If retrofitting illumination is desired, ensure compatibility with the actuator’s mechanical travel path—adding bezels or lenses must not impede lever movement. Note that any added lighting should operate at ≤24V DC to avoid exceeding the breaker’s DC voltage rating indirectly via feedback paths.
How does the RoHS3 compliance status of the BB2-A0-03-650-521-C influence long-term supply chain risk assessment for global manufacturing programs?
RoHS3 compliance confirms adherence to Directive 2011/65/EU, restricting hazardous substances including lead, mercury, cadmium, and certain phthalates. This reduces regulatory risk in EU markets and aligns with sustainability goals. However, compliance does not guarantee full REACH exemption; the "REACH Unaffected" designation indicates raw materials meet current SVHC thresholds (<0.1% w/w), but ongoing monitoring is advised as new restrictions emerge. For global programs sourcing from multiple regions, maintaining batch traceability through Carling’s documentation ensures continuity despite evolving legislation. The BB2-A0-03-650-521-C’s EAR99 classification also simplifies export controls, making it suitable for international deployments without complex licensing.
What is the expected contact life expectancy for the BB2-A0-03-650-521-C under typical switching profiles involving resistive vs. capacitive loads?
The BB2-A0-03-650-521-C is engineered for 10,000 mechanical operations and 5,000 electrical cycles at full-rated current under resistive loads. Capacitive switching introduces higher inrush currents and transient recovery voltages, effectively reducing contact life by 30–50%. For example, energizing a 100μF capacitor bank at 80V DC may degrade contact integrity after fewer than 2,000 cycles. To mitigate this, soft-start circuits or pre-charging stages should precede breaker engagement. In contrast, purely resistive loads (e.g., heaters or incandescent lighting) allow closer approximation of rated cycle life. Always consult Carling’s endurance curves for specific duty cycles, as cumulative effects from frequent partial-load switching can accelerate wear beyond nominal expectations.
Is it acceptable to parallel two BB2-A0-03-650-521-C units to achieve 100A capacity, and what synchronization risks arise?
Parallel connection of the BB2-A0-03-650-521-C is generally not recommended due to mismatched contact resistances and timing differences between actuators. Even minor variations in closure sequence or contact bounce can cause one unit to carry 60–70% of the total current while the other handles the remainder, leading to localized overheating. Furthermore, fault current sharing becomes unpredictable during short-circuit events, potentially exceeding individual ratings. Instead, use a single 100A-rated breaker from a compatible series or design a master-slave configuration with coordinated control logic. If redundancy is required for safety-critical applications, employ separate branch circuits with independent protection rather than relying on mechanical paralleling.

Parts with Similar Specifications

The three parts on the right have similar specifications to Carling Technologies BB2-A0-03-650-521-C

Product Attribute BB2-A0-03-650-511-C BB2-A0-03-650-512-C BB2-A0-03-630-2D1-C BB2-A0-03-630-522-C
Part Number BB2-A0-03-650-511-C BB2-A0-03-650-512-C BB2-A0-03-630-2D1-C BB2-A0-03-630-522-C
Manufacturer Carling Technologies Carling Technologies Carling Technologies Carling Technologies
Series - - - -
Approval Agency - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Number of Poles - - - -
Illumination Voltage (Nominal) - - - -
Actuator Type - - - -
Current Rating (Amps) - - - -
Illumination - - - -
Voltage Rating - DC - - - -
Voltage Rating - AC - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Breaker Type - - - -

BB2-A0-03-650-521-C Datasheet PDF

Download BB2-A0-03-650-521-C pdf datasheets and Carling Technologies documentation for BB2-A0-03-650-521-C - Carling Technologies.

Datasheets
B-Series.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
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  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
Carling Technologies

BB2-A0-03-650-521-C

Carling Technologies
98D-BB2-A0-03-650-521-C

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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