EKM6DC-400 1500V DC Molded Case Circuit Breaker (250A-400A) for Solar and Battery Systems
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Technical Data
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| Product Family ID | OS-ETK-EKM6DC-400 |
|---|---|
| Variant SKU Count | 4 |
| Supplier | ETK |
| Supplier Model | EKM6DC-400 |
| Product Type | MCCB |
| Available Current Ratings | 250A / 315A / 350A / 400A |
| Available Voltage Ratings | 2P |
| Rated Voltage | 2P |
| Rated Current | 250A / 315A / 350A / 400A |
| Frame Current | 400A |
| Frame Size / Ways | 400A |
| Rated Current | 250,315,350,400 / 250A / 315A / 350A / 400A |
| Rated Insulation Voltage | 1500V |
| Standard | IEC60947-2 |
| Uimp | 12kV |
Product Overview
Four current variants from 250A to 400A in 1500V DC for large combiner buses and DC main switchboards in commercial and utility PV plants. The range bridges medium combiner output and large inverter DC input protection in a single MCCB frame.
At 400A, this device typically protects the combined DC bus from multiple combiners feeding one inverter input. Confirm the inverter DC input current rating and the combined combiner output current before selecting the rated current variant.
At 400A, this MCCB is used at the central DC bus connection point in utility-scale blocks. Confirm bus bar connection drill pattern and cable lug sizing before ordering — MCCB terminal configurations vary between manufacturers, and a mismatched lug contact area increases contact resistance and heat generation under load.
Applications
PV string and array protection
Combiner box internal protection
Inverter DC input circuits
Utility and C&I solar BOS
Certifications & Compliance
Frequently Asked Questions
How do I choose between EKM6DC-315 and EKM6DC-400?
Both overlap at 315A, but may differ in frame design. For currents above 315A, EKM6DC-400 is the correct family. For exact current requirements at the overlap point, share your system current and we confirm which frame fits your switchboard best.
Is one EKM6DC-400 per combiner, or per inverter?
Typically one main DC MCCB per combiner at the combiner output, and one larger MCCB at the inverter DC input aggregating multiple combiners. The inverter input breaker is sized to the total DC current from all combiners feeding that inverter.
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