EKM6-250H 250A Compact MCCB with 50kA Breaking Capacity
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| Product Family ID | OS-ETK-EKM6-250H |
|---|---|
| Variant SKU Count | 10 |
| Supplier | ETK |
| Supplier Model | EKM6-250H |
| Product Type | MCCB |
| Available Current Ratings | 100A / 125A / 140A / 160A / 180A / 200A / 225A / 250A / 63A / 80A |
| Available Voltage Ratings | 800V, 1000V, 1140V |
| Rated Voltage | 800V, 1000V, 1140V |
| Rated Current | 100A / 125A / 140A / 160A / 180A / 200A / 225A / 250A / 63A / 80A |
| Frame Current | 250A |
| Frame Size / Ways | 250A |
| Rated Current | 63,80,100,125,140,160,180,200,225,250A / 100A / 125A / 140A / 160A / 180A / +5 more |
| Rated Voltage | 800V, 1000V, 1140V |
| System Voltage | 800V, 1000V, 1140V |
Product Overview
Ten current variants from 63A to 250A with 50kA breaking capacity — the highest breaking capacity in the medium-current MCCB range. Suitable for main distribution board positions close to large transformers or MV/LV switchgear where fault current can be high even on low-current feeders.
The 50kA breaking capacity is the key differentiator: close to a 1000kVA transformer secondary at 400V AC, prospective fault current can exceed 40kA. A 50kA-rated MCCB provides adequate margin where lower breaking capacity devices would fail destructively.
250A output MCCBs are a common main switch size for 100–200kW string inverter groups. The H-frame provides a higher short-circuit interrupting capacity than an M-frame at the same current rating, offering a safety margin at installation points with moderate grid fault levels or near transformer secondary connections.
Applications
Inverter output protection
AC distribution boards
EV and PV support circuits
Residential and commercial electrical BOS
Frequently Asked Questions
Why is 50kA breaking capacity important even for a 250A breaker?
Breaking capacity must exceed the available fault current at the point of installation — not just the load current. Close to a large transformer secondary, fault current can reach 40-50kA even on circuits carrying only 100A of load. 50kA breaking capacity provides the required margin.
Is EKM6-250H suitable for PV inverter AC output protection?
Yes — the 10-variant current range covers most string and hybrid inverter AC outputs. Confirm the inverter rated AC current is within the selected variant and that the board fault current is within the 50kA breaking capacity.
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