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Many Chinese DC miniature circuit breakers are sold as “DC 1000V”. Read the datasheet and you usually find that 1,000 V applies only when four poles are wired in series. Order the 2-pole version for a 1,000 V string and the breaker runs at about twice its rated voltage. That gap between the headline voltage and the pole configuration is the most common specification mistake with these products, so this ranking is built around it.

Short answer: the ten Chinese DC MCB makers worth shortlisting in 2026 are CHINT, BENY, FEEO, NOARK, Delixi, Suntree, MOREDAY, Tengen, GEYA and TOMZN. CHINT and BENY lead on documentation, and BENY is the one with a UL 489B version. FEEO stands out for breaking capacity (10 kA) and 1,500 V options. Nearly all of them reach 1,000 VDC only in a 4-pole configuration, so always read the per-pole voltage table before ordering.

Last updated: October 2026. Ratings come from each maker’s current datasheet or product page (links in Sources). We list the 63 A frame most often used in PV string protection. “kA” means rated ultimate short-circuit breaking capacity (Icu) under IEC 60947-2 unless stated otherwise.

Spec comparison: the 63 A DC frame

MakerModelVoltage by polesBreaking capacityCertification noted
CHINTNB1-63DC1P 250 V, 2P 500 V, 4P 1,000 V6 kACCC, CE, CB, TÜV
BENYBB1-63IEC: 1P 300 V to 4P 1,200 V; UL: 2P 600 V, 4P 1,200 V6 kA (IEC); 5 kA (UL)UL 489B version available
FEEOFPV-631P 250 V, 2P 550/800 V, 3P 750 V, 4P 1,000 to 1,500 V10 kATÜV
NOARKEx9BP2P 500 V, 4P 1,000 V6 kAIEC 60947-2
DelixiCDB9Z1P/2P 125/250 V, 4P 1,000 V10 kA (low V); 6 kA (4P)IEC 60947-2
SuntreeSL7N-634P 1,000/1,200 V; 2P 800 V6 kA; 2 kA at 4P 1,200 V or 2P 800 VSAA
MOREDAYMDB1Z-634P 1,000 V6 kA to 40 A; 4.5 kA at 50/63 A; 10 kA (63H)IEC 60947-2
TengenTGBG-63DC4P 1,000/1,200 VSee datasheetIEC 60947-2
GEYAGYM9-63DC4P 1,000 V6 kAIEC 60947-2
TOMZNTOB7Z-63Listed as 2P 1,000 V6 kA (Ics 75%)Check documents

The 4-pole trap, in one example

Take CHINT’s NB1-63DC. Each pole is rated roughly 250 V. One pole handles 250 V, two in series 500 V, and four in series 1,000 V. A 2-pole NB1-63DC in a 1,000 V string circuit is working at double its rating, and the arc it has to break at fault will not extinguish reliably. Most makers in this list follow the same logic. FEEO and BENY reach higher voltages per pole, but they still publish the voltage for each pole count.

So before comparing prices, compare like with like. Ask: “What is the rated voltage of this breaker in the pole configuration I am ordering, and how are the poles wired?” Many datasheets show a wiring diagram for series connection; follow it exactly.

The ten makers

1. CHINT

The NB1-63DC is the reference product for Chinese DC MCBs: 1 to 63 A, C curve, 6 kA, with a clear table of 250 V per pole up to 1,000 V in four poles. It carries CCC, CE, CB and TÜV marks, and the datasheet and certificates are downloadable from CHINT Global. If your buyer asks for “a brand they have heard of”, this is usually it.

2. BENY

BENY’s BB1-63 is the only breaker here with a UL 489B version, rated 600 VDC in 2 poles and 1,200 VDC in 4 poles at up to 50 A and 5 kA. The IEC version runs from 300 V in one pole to 1,200 V in four at up to 63 A and 6 kA, and is non-polar, so reversed wiring does not compromise breaking. Choose BENY when one product family has to serve both IEC and North American projects.

3. FEEO

FEEO’s FPV-63 has the highest breaking capacity in this group at 10 kA, and its 4-pole versions reach 1,000, 1,200 or 1,500 V. A 2-pole version is rated 550 or 800 V, more per pole than most rivals. The larger FPV-125 also goes up to 1,500 V. That makes FEEO a strong pick for 1,500 V string inverters and for combiners with many paralleled strings, where fault current is higher.

4. NOARK

NOARK’s Ex9BP is a K-curve breaker rated 500 V in 2 poles and 1,000 V in 4, at 6 kA, and non-polar. The datasheet is unusually candid that electrical life is 300 operations. That is normal for DC MCBs, which are designed to trip on faults rather than to switch loads every day, but few makers state it. Do not use any DC MCB as a daily on/off switch; use an isolator.

5. Delixi

Delixi’s DC MCB is the CDB9Z: 10 kA at 125 or 250 V in one and two poles, and 6 kA at 1,000 V in four poles. The 10 kA low-voltage rating makes it a sensible choice for 48 V battery and telecom circuits as well as PV strings.

6. Suntree

Suntree’s SL7N-63 is rated up to 1,000 or 1,200 V in four poles from 6 to 63 A, and carries SAA certification (SAA-202674-EA) for Australia. Read the footnotes: breaking capacity is 6 kA in most configurations but drops to 2 kA at 4P 1,200 V and 2P 800 V. For high-voltage strings with several parallel inputs, 2 kA may be too low.

7. MOREDAY

MOREDAY’s MDB1Z-63 is a 4-pole 1,000 V breaker with an honest derating table: 6 kA up to 40 A, falling to 4.5 kA at 50 and 63 A. Its MDB1Z-63H version raises that to 10 kA. If you specify 63 A, specify the H version.

8. Tengen

Tengen’s DC breaker is the TGBG-63DC, sometimes misquoted as TGB1-63DC. It comes in 4-pole 1,000 and 1,200 V versions up to 63 A. Confirm the breaking capacity for your current rating in the datasheet before ordering, as it is not shown on the summary page.

9. GEYA

GEYA’s GYM9-63DC is a 4-pole 1,000 V, 1 to 63 A, 6 kA breaker. One detail matters for outdoor PV: the stated ambient temperature range is −5 to +40 °C. Combiner boxes in the sun regularly exceed 40 °C inside, so plan for thermal derating or choose a breaker rated for higher ambient temperatures.

10. TOMZN

TOMZN sells a 2-pole DC breaker listed as 1,000 V, 6 kA, with Ics at 75% of Icu. A 2-pole 1,000 V rating is unusual for a 63 A frame, so ask for the full datasheet, test report and certificate covering that exact configuration before using it on a 1,000 V string. TOMZN is a budget option; treat its listings as a starting point for questions.

One brand we left out

Liangxin is a respected Shanghai brand, and its NDB1-63 often appears in “DC MCB” searches. Its DC version is rated 60 or 80 V, suitable for telecom and battery circuits, not PV strings. It is a good example of why a “DC” label alone tells you nothing about PV suitability.

How to specify a DC MCB for PV

  • Voltage: the rated voltage for your pole count must exceed the maximum open-circuit string voltage at the coldest site temperature.
  • Current: size to 1.25 times the string short-circuit current, then check thermal derating inside the enclosure.
  • Breaking capacity: must exceed the prospective fault current from paralleled strings or batteries.
  • Polarity: non-polar breakers tolerate reversed wiring and reverse fault current from batteries.
  • Market: IEC 60947-2 for most markets; UL 489B for PV in North America.

ShineTong supplies DC circuit breakers with the per-pole voltage table on every quotation, plus DC isolators, PV fuses and DC surge protection for the same box. For UL disconnects, see China UL isolation switch suppliers. For ground-fault and electronic protection, see GFCI breaker manufacturers and solid-state circuit breaker manufacturers.

Frequently asked questions

Why does a 1000V DC MCB need four poles?

Most 63 A DC MCBs are rated about 250 V per pole. Four poles wired in series share the arc voltage when breaking, giving a 1,000 V rating. A 2-pole breaker of the same frame is usually rated only 500 V.

Can I use an AC MCB on a solar DC circuit?

No. DC current has no zero crossing, so the arc does not self-extinguish. AC breakers lack the magnetic arc blow-out and chamber design needed to interrupt DC and can fail dangerously.

Which Chinese DC MCB has UL certification?

Of the ten here, BENY offers a UL 489B version of its BB1-63 (2P 600 VDC, 4P 1,200 VDC, up to 50 A, 5 kA). The others document IEC 60947-2 ratings.

What breaking capacity do I need for a PV string breaker?

It must exceed the maximum fault current that can flow into the faulted string from paralleled strings and any battery. For small arrays 6 kA is common; larger combiners or battery systems may need 10 kA.

Does it matter if a DC breaker is polarized?

Yes. A polarized breaker only interrupts reliably in one current direction. With batteries or paralleled strings, fault current can flow in reverse, so non-polar breakers are safer.

Sources