DC Miniature Circuit Breakers (DC MCB)
Compare the published VIOX VOB3-63DC, VOB6-63DC and VOB2-125DC series for direct-current circuit protection in solar PV, battery, telecom and industrial DC systems.
Direct currentDC-specific interruption
Series configurationVerify poles and polarity
63A / 125APublished current platforms
250V–1200V classesConfirm exact series data
What is a DC MCB?
A DC miniature circuit breaker is designed to interrupt overload and short-circuit current in a direct-current circuit within its published voltage, pole, polarity and breaking characteristics.
DC arcs do not pass through a natural current zero in the same way as AC arcs. The breaker construction and required series-pole arrangement must therefore be selected from explicit DC ratings rather than inferred from an AC device.
DC MCB Series Overview
Three published VIOX series for compact and higher-current DC protection. Open each product page for exact voltage, pole and interruption data.
How to choose a DC MCB
Start with maximum system voltage and fault conditions, then verify poles, polarity and circuit coordination.
Maximum DC voltage
Confirm the worst-case circuit voltage and the required pole arrangement from the exact datasheet.
Current and breaking capacity
Coordinate rated current with conductor capacity and verify prospective DC fault current.
Poles and polarity
Follow the approved wiring diagram, including any series-pole or polarity requirements.
Application coordination
Check source behavior, upstream and downstream protection, isolation and environmental conditions.
Treat DC interruption as a system decision
A matching current number is not enough; voltage, pole arrangement, polarity and available fault current determine suitability.
Compare published DC MCB series
Blank cells mean the value is not available in the current product summary. Open the model page or request its datasheet before specification.
| Series | Current platform | System | Poles | DC voltage |
|---|---|---|---|---|
| VIOX VOB3-63DC | 63A | Direct current | — | — |
| VIOX VOB6-63DC | 63A | Direct current | — | — |
| VIOX VOB2-125DC | 125A | Direct current | — | — |
DC MCB Applications
Typical environments where the exact product characteristics must be verified.
Residential Buildings
Residential solar and storage circuits where the exact DC ratings match the system.
Industrial Automation
Control-power, auxiliary and machine DC distribution within the published breaker duty.
Solar & Energy Storage
PV strings, combiner circuits and battery systems using verified DC voltage and polarity arrangements.
DC MCB Knowledge & Selection Guides
All articles
DC MCB Selection Questions
Quick answers for preliminary product-family comparison before detailed circuit verification.
Can an AC MCB be used in a DC circuit?
Only if the manufacturer explicitly publishes the required DC voltage, pole and wiring configuration for that exact device. Do not infer DC suitability from an AC rating.
Why can multiple poles be connected in series?
Approved series-pole arrangements can divide the DC voltage and support arc interruption, but only the wiring shown for the exact model may be used.
Does polarity matter?
Some DC breakers are polarity-sensitive and others publish polarity-independent arrangements. Follow the selected model markings and diagram.
How is rated current selected?
Coordinate continuous load, conductor capacity, ambient conditions and protective characteristics, then verify the exact datasheet.
Which details are needed for selection?
Provide maximum DC voltage, load current, source and battery or PV details, available fault current, poles, wiring arrangement, quantity and target market.
Need the Right DC MCB?
Let’s Verify the DC Circuit.
Send the maximum DC voltage, load current, source type, available fault current, poles, wiring arrangement, quantity and target market.
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