HUM18Z-50 DC MCB – 6A to 50A,1P/2P
The HUM18Z-50 is a DC MCB rated 6A–50A at DC 220V(1P)/440V(2P). 6kA breaking capacity with B and C trip curves. Available in popular ratings: 16A, 20A, 32A, 40A. Compact DIN rail design. For communications, electric locomotives, battery systems, and DC circuit protection.
Standard: IEC 60947-2
Rated Current: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A
Rated Voltage: DC 220V (1P) / DC 440V (2P)
Breaking Capacity: 6kA Icn
Poles: 1P, 2P
Tripping Curves: B, C
Applications: DC protection, communications, traction, battery systems
Product Information
HUM18Z-50 DC MCB – Compact DC Circuit Protection, 6A to 50A
The HUM18Z-50 series DC MCB is a dedicated direct-current miniature circuit breaker developed from HUYU Electric’s trustworthy HUM18-63 platform. Designed for DC 220V single-pole and DC 440V two-pole configurations, this DC MCB breaker consistently delivers a 6kA breaking capacity across all current ratings. Available in standard sizes like 16 amp, 20 amp, 32 amp, and 40 amp DC MCB variants, it ensures precise overcurrent protection where AC-rated MCBs fail to operate safely.
With a time constant of τ≤4ms and both B and C trip curves, the HUM18Z-50 caters to the inrush and overload characteristics of various DC loads. Its compact DIN rail-compatible design allows it to seamlessly replace AC MCBs in existing installations. Ideal for communications, traction, and solar applications, HUYU Electric provides reliable OEM/ODM solutions with comprehensive documentation, meeting the needs of discerning buyers.
Technical Data
| Parameter | Value |
|---|---|
| Frame Size | 50 |
| Rated Current In | 6A – 50A (6, 10, 16, 20, 25, 32, 40, 50A) |
| Rated Voltage Ue | DC 220V (1P) / DC 440V (2P) |
| Time Constant | τ ≤ 4ms |
| Breaking Capacity Icn | 6kA |
| Poles | 1P, 2P |
| Trip Curves | B, C |
| Applications | Communications, electric locomotives, DC power lines, battery circuits, DC combiner boxes |
| MOQ | Contact for project quotation |
The HUM18Z-50 is a purpose-built DC MCB — engineered and rigorously tested for direct current fault interruption. Standard AC MCBs repurposed for DC use may lead to sustained arcs and functional failures. The HUM18Z-50 consistently achieves its 6kA breaking capacity across all current ratings, simplifying upstream protection coordination. Widely available options include DC MCB 16 amp, DC MCB 32 amp, 40 amp DC MCB, and up to 50A for feeder lines.
Trip Curves & DC Protection Characteristics
Available with B and C trip curves, the HUM18Z-50 adapts to various DC load profiles. The B curve is optimized for resistive circuits like DC lighting and heating, while the C curve suits applications with moderate inrush, such as DC motors and switch-mode power supplies. These curves are expertly calibrated for DC operation, making the HUM18Z-50 a reliable DC MCB breaker for critical installations like communication base stations, which require tight protection for 48V DC distribution.
Request a Quotation for HUM18Z-50 DC MCBs – All Current Ratings
6A–50A, DC 220V/440V. Available in 16A, 20A, 32A, 40A, 50A. 6kA breaking, B/C curves, 1P/2P. Suitable for communications, EV, and DC power protection. OEM/ODM options available with complete documentation. Contact us for personalized pricing and lead times.
Project-Based Quotation • IEC 60947-2 • Worldwide Shipping
OEM/ODM Supply – Custom-Built DC Circuit Protection
HUM18Z-50 – Authentic, Reliable DC Protection
The HUM18Z-50 addresses challenges seen in misapplied AC-rated MCBs on DC circuits, where sustained arc faults can lead to equipment damage. It delivers true DC-rated performance with 6kA breaking capacity, τ≤4ms, and trip curves specifically calibrated for DC. Available in popular sizes like 20A, 32A, and 40A, it is tailored for modern DC applications such as communications or traction systems. Switching from competing brands like Schneider Electric, ABB, or Siemens is seamless, with HUYU Electric offering certified safety, custom labeling, and competitive pricing directly from the manufacturer.
How to Select the Right DC MCB for Your Application
Practical considerations when using the HUM18Z-50 in DC power systems.
1. Why DC MCBs Are Unique
AC MCBs extinguish arcs using the natural zero-crossing of AC current, while DC MCBs lack this benefit. The HUM18Z-50 incorporates specialized magnetic arc extinguishing features to ensure safety in DC circuits, contrasting the risks of using an AC MCB on DC lines.
2. Choose the Correct Trip Curve
For low inrush loads, opt for the B curve. For moderate inrush, favor the C curve. Use a DC MCB 32 amp for powering telecommunications systems and a DC MCB 20 amp for DC motors requiring the C curve.
3. Decide Between 1P and 2P
Single-pole configurations suit grounded DC systems. Choose two-pole setups for floating systems or applications requiring simultaneous line disconnection, which also doubles the voltage rating to 440V DC.
4. Current Rating & Breaking Capacity
Select a DC MCB rating slightly higher than the maximum continuous load current. For a 15A load, choose a DC MCB 16 amp as the higher rating ensures smooth operation. Verify the breaking capacity against the short-circuit current estimation.
Frequently Asked Questions
What distinguishes an MCB from a DC MCB?
MCBs are generally designed for AC circuits where zero-crossing aids arc extinction. DC MCBs, like the HUM18Z-50, are calibrated for circuits with no zero-crossing, utilizing advanced magnetic arc chambers for safe operation and effective fault interruption.
Can DC MCBs operate in AC setups?
Although technically feasible, using DC-rated MCBs on AC systems is inadvisable as the arc-flux design optimized for DC does not function reliably with AC. For AC circuits, choose AC-rated MCBs only.
What applications are suitable for DC MCBs?
DC MCBs safeguard against overcurrent and short circuits in DC systems, including telecommunications base stations (48V DC), electric locomotives, solar PV systems, and others. The HUM18Z-50 is available from 6A to 50A and addresses diverse requirements.
What differentiates DC MCBs from DC MCCBs?
DC MCBs are lightweight, compact, and typically rated up to 63A, offering up to 10kA breaking capacity. DC MCCBs, larger and heavy-duty breakers, are designed to support higher rated currents and breaking capacities. For DC circuits under 50A, HUM18Z-50 fulfills the need; higher ratings require MCCBs.
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