Best DC Molded Case Circuit Breaker ODM Manufacturer Guide
Discover top DC molded case circuit breakers (MCCBs) from leading ODM manufacturers. This guide highlights 5 reliable options suitable for solar PV, batteries, and DC power systems. Learn about performance, voltage ratings, current ratings, and key features to help you choose the right MCCB for DC applications.
Summary of chosen products
| Brand | Name | Current / Poles | Voltage (DC) | Key Feature |
|---|---|---|---|---|
| Heschen | HSM1PV-250 2P DC MCCB | 250A, 2P | 550V DC | Fast thermal-magnetic trip, 10kA breaking capacity |
| Heschen | HSM1PV-250 2P DC MCCB | 250A, 2P | 550V DC | High reliability for PV systems |
| Heschen | HSM1PV-125 2P DC MCCB | 125A, 2P | 550V DC | Compact, solid protection |
| CNLonQcom | 200–250A MCCB 2P DC | 200A, 2P | 250V DC | Thermal-magnetic trip with silver contacts |
| CNLonQcom | 250A MCCB 2P DC500V | 250A, 2P | 500V DC | Wide DC range, durable insulation |
Heschen HSM1PV-250 2P DC MCCB, 550V DC
Heschen’s DC Molded Case Circuit Breaker HSM1PV-250 (2 Poles) is designed for photovoltaic and solar grid applications. The device operates at up to 550V DC and provides a high breaking capacity of 10kA. It lists Ie of 125A with Ics equal to 75% Icu, ensuring robust short-circuit protection in PV installations. Its compact 2P design suits tight DC distribution panels.
Key specs include Ue = Ui = 550V DC and Uimp = 8 kV, which support safe switching and impulse withstand performance. This model is commonly used in solar PV systems and grid-tied DC circuits where reliable overcurrent protection is required. The 2P configuration helps balance protection with space in DC distribution setups.
What to consider
- Voltage rating suitability for your DC network (550V DC in this model).
- Current rating alignment with system load (125A in this variant).
- Breaking capacity (10kA) ensures rapid isolation during faults.
Heschen HSM1PV-250 2P DC MCCB, 250A, 550V DC
This variant mirrors the 250A, 2P configuration with the same 550V DC rating. It is suited for solar PV inverters, battery banks, and DC distribution networks requiring dependable protection. The higher current capacity provides headroom for PV array combiner boxes and main DC feeders in commercial installations. The MCCB’s 10kA breaking capacity supports fast fault clearance and reduces arcing risk.
Design notes include 2P construction for straightforward wiring and improved fault isolation. The device’s DC-specific protections help prevent nuisance tripping in solar configurations where DC fault currents are common.
Heschen HSM1PV-250 2P DC MCCB, 150A Variant
This Heschen model delivers 150A (2P) for solar and DC distribution where lower current protection is needed. The same 550V DC rating and 8 kV impulse withstand ensure reliable performance in PV systems with moderate loads. With 10kA breaking capacity and 75% Icu, it maintains protective integrity under fault conditions while accommodating smaller solar installations or auxiliary DC circuits.
Use this variant in smaller PV arrays, battery charging stations, or microgrid DC feeders where space or load constraints exist but dependable DC protection remains essential.
CNLonQcom 250A DC MCCB, 2P, 500V DC
This CNLonQcom MCCB offers 250A in a 2P configuration suitable for higher-current DC systems. It emphasizes advanced thermal-magnetic trip protection, with a short-circuit breaking capacity up to 20kA, a feature beneficial for high-energy DC networks, such as PV PV-banks, battery storage, and UPS integrations. Silver-alloy contacts (moving 35%, fixed 45%) improve conductivity and longevity, while high-insulation resin housing enhances safety in harsh environments.
The MCCB supports DC voltages from 12V to 500V and AC voltages from 90V to 480V, offering flexibility for mixed systems. This makes it a practical ODM option for PV installations that require adaptable protection across different DC rails.
Generic 2P DC 1000V MCCB for PV Systems (160A)
Generic 2P DC MCCBs rated at 160A are designed for higher-voltage solar and DC distribution applications up to 1000V. They emphasize precise overload and short-circuit protection with a bimetal and electromagnetic trip mechanism. These units typically mount on DIN rails and provide reliable protection for DC PV circuits, though specifications vary by manufacturer. They are suitable for OEM integrations where a cost-effective, high-voltage DC MCCB is required.
Buying Guide: Key Purchase Considerations for DC MCCBs
- Voltage and current ratings: Ensure the DC voltage rating matches your system’s maximum, and pick a current rating that aligns with the continuous load plus safety margins.
- Breaking capacity: Higher breaking capacity (kA rating) reduces fault arc risk and improves protection in high-energy DC circuits.
- DC-specific protection: Look for devices designed for DC operation, with appropriate impulse withstand (Uimp) and Ics/Icu ratings.
- Trip characteristics: Thermal-magnetic trip provides dependable protection for overloads and short circuits; verify trip curves suit your application and maintenance window.
- Contacts and durability: Silver-alloy contacts offer better conductivity and longer service life, especially in PV and battery environments where arcing can occur.
- Insulation and enclosure: High-insulation resin housings improve safety in harsh environments; consider enclosure IP ratings if exposed to dust, moisture, or outdoor use.
- ODMs vs. branded options: ODM MCCBs may offer cost and customization advantages; verify technical support, documentation, and compatibility with your system architecture.
- Installation and form factor: Check DIN rail compatibility, mounting depth, and whether a 1P or 2P configuration better suits your DC distribution layout.
- Maintenance and testing: Plan for routine inspections and potential recalibration or replacement intervals based on system dynamics and environmental conditions.