Reliable DC Circuit Breaker China Manufacturer and Supplier
TYPLE DC circuit breakers protect solar PV and energy-storage DC circuits against overload and short-circuit faults. This page covers our full range — DIN-rail DC MCBs, DC MCCBs for higher currents, and enclosed DC MCB boxes — to help EPC contractors and distributors choose the right breaker for each part of the system.
Features of DC Circuit Breakers
- Overload and Short-Circuit Protection: Automatically interrupts fault currents in DC circuits.
- Resettable Operation: Can be manually reset after the fault is resolved.
- Branch and Main Circuit Protection: DC MCB and MCCB options for different circuit requirements.
- Flexible Mounting: DIN-rail and screw-fixed designs for panels and solar combiner boxes.
- Weatherproof Box Options: Enclosed DC breakers available for standalone outdoor installation.
TYPLE DC Circuit Breaker Series
A DC circuit breaker is an automatic overcurrent protection device that trips and interrupts a solar DC circuit when it detects an overload or a short-circuit, protecting cables and downstream equipment. It is built to align with IEC 60947-2 and, unlike a fuse, can be reset by hand after the fault is cleared. Unlike a DC isolator, which only disconnects the circuit manually, a DC circuit breaker actively interrupts fault current. In solar systems, DC breakers come in three main forms: DIN-rail miniature circuit breakers (MCBs) for string and branch protection, molded-case circuit breakers (MCCBs) for higher main-line currents, and enclosed DC MCB boxes that house a breaker in a weatherproof unit for standalone mounting.
For how a breaker differs from an isolator, see the difference between a DC MCB and a DC isolator.
Why Choose TYPLE As Your DC Circuit Breaker Supplier
TYPLE is a Wenzhou-based manufacturer of PV combiner boxes and DC protection components for solar and energy-storage systems, with 10+ years in low-voltage electrical manufacturing (founded 2015) in the Liushi electrical hub. We support OEM and ODM orders with short lead times.
send your model or project requirements; our engineering team replies with a tailored quotation and confirmed lead time within 24 hours.
Why Choose TYPLE As Your DC Circuit Breaker Supplier
TYPLE is a Wenzhou-based manufacturer of PV combiner boxes and DC protection components for solar and energy-storage systems, with 10+ years in low-voltage electrical manufacturing (founded 2015) in the Liushi electrical hub. We support OEM and ODM orders with short lead times.
send your model or project requirements; our engineering team replies with a tailored quotation and confirmed lead time within 24 hours.
Applications of DC Circuit Breakers
- Residential rooftop solar — DIN-rail DC MCBs protect strings inside the combiner box; an enclosed DC MCB box gives a standalone weatherproof breaker where no combiner box is used.
- Commercial & industrial PV — DC MCCBs handle higher main-line currents in larger rooftop and ground-mount systems, with DC MCBs protecting sub-circuits.
- Off-grid & energy storage (ESS) — DC breakers protect battery branch and feeder circuits, with enclosed boxes suited to outdoor, harsh-climate mounting.
DC MCB vs DC MCCB vs DC MCB Box: Choosing the Right One
Choose a DC MCB for string-level protection up to 63 A, a DC MCCB for combiner and array currents from 63 A to 800 A, and a DC MCB Box when you need a pre-wired, IP-rated enclosure for outdoor mounting. The three differ by current range, whether they are enclosed, and the standard they are built to.
| DC MCB | DC MCCB | DC MCB Box | |
|---|---|---|---|
| TYPLE model | TPB7-63 | TPM7 / TPM7n | TPX7-C3 |
| Current range | up to 63 A | 63–800 A | up to 63 A (enclosed MCB) |
| Max DC voltage | 1000 V | 1000 V (TPM7) / 1500 V (TPM7n) | 600 V |
| Poles | 1P–4P | 1P–4P (TPM7) / 2P–3P (TPM7n) | 2P |
| Enclosure | DIN-rail, open | Screw-fixed, open | IP66 / IK10 sealed box |
| Typical position | Inside a combiner box, per string | Combiner box output / array cabinet | Outdoor wall-mount, standalone |
| Standard | IEC 60947-2 | IEC 60947-2 | IEC 60947-2 |
| Best for | String protection in a housed board | Higher combined currents | Outdoor use without a separate box |
In practice these are complementary, not alternatives: a typical DC1000V array uses per-string DC MCBs feeding a combiner box, with a DC MCCB on the output. For outdoor installations without a separate enclosure, a DC MCB Box combines breaker and housing in one IP66 unit.
DC Circuit Breaker Selection Guide
Choose a DC circuit breaker according to the circuit’s maximum voltage, design current, prospective short-circuit current, and wiring requirements. These factors determine whether the breaker is suitable for your solar PV or battery system.
Rated Voltage and Pole Configuration
The rated DC voltage must cover the maximum circuit voltage. In solar PV systems, account for higher open-circuit voltage at low temperatures. Follow the manufacturer’s wiring diagram, as the voltage rating may depend on a specific pole configuration and series connection.
Rated Current and Cable Protection
Select the rated current to carry the intended load while protecting the cables under applicable installation requirements. Account for ambient temperature and any required derating. At solar combiner box outputs, size the DC circuit breaker for the combined output circuit rather than a single PV string.
Short-Circuit Breaking Capacity
The breaker’s rated DC breaking capacity must meet or exceed the prospective short-circuit current at its installation point. This is particularly important in battery systems, where fault currents can be high. Check breaking capacity at the required operating voltage.
Polarity and Current Direction
Follow the specified polarity markings and supply connections. For battery circuits with charging and discharging current, confirm that the selected DC circuit breaker supports both current directions at the required voltage. Do not assume every DC breaker is suitable for bidirectional operation.
Frequent Asked Questions
A DC circuit breaker automatically interrupts a DC circuit during an overload or short-circuit, protecting cables and equipment. Built to IEC 60947-2, it can be reset by hand after the fault clears, unlike a fuse.
A DC MCB (miniature circuit breaker) is a compact DIN-rail device for lower currents, typically up to 63A. A DC MCCB (molded-case circuit breaker) handles higher currents for main DC lines, such as the TPM7-125 up to 125A. Both provide automatic overload and short-circuit protection under IEC 60947-2.
A DC MCB box is a DC miniature circuit breaker housed in a weatherproof enclosure, so it can be mounted outdoors as a standalone unit without a separate combiner box.
Not exactly. A breaker provides overcurrent protection like a fuse but is resettable, while a DC isolator only disconnects the circuit and offers no protection. Many solar systems use them together.
TYPLE DC circuit breakers are engineered to align with IEC 60947-2, and are built with components from certified supply-chain partners.
