DC MCCB Breaker
DC MCCB Breaker
DC MCCB Breaker

DC MCCB Breaker 1500V 800A High Voltage Molded Case

Engineered to secure utility-scale photovoltaic and heavy energy storage systems, this DC MCCB Breaker delivers uncompromising high-voltage direct current isolation. The EKM6DC series functions as an exceptionally robust molded case breaker, operating flawlessly up to 1500VDC and managing massive continuous loads up to 800A, ensuring reliable short-circuit and overcurrent protection for demanding commercial new energy applications.

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ModelEKM6DC
Category,
AvailabilityIn stock
  • CE & TUV certified
  • Worldwide shipping
  • OEM & ODM support

Product Features of the DC MCCB Breaker

Constructed for rigorous new energy environments, this DC MCCB Breaker integrates a highly responsive instantaneous tripper with a rugged, three-proof (TH) customized enclosure.

  • Extreme High-Voltage Capacity: Operates seamlessly at massive voltages up to 1500VDC, decisively isolating severe faults with a maximum 50kA ultimate short-circuit breaking capacity (Icu).
  • Environmental Resilience: Custom TH variants resist damp air, salt fog, oil fog, and mold, making it highly dependable for harsh, high-altitude (up to 5500m) B2B installations.
  • Zero Arc Technology: Engineered with a specialized arcing distance of ≤50mm (utilizing an integrated arcing cover) to safely extinguish high-voltage DC arcs.
  • Comprehensive Modularity: Supports rapid integration of shunt releases, undervoltage releases, alarm contacts, and motor operating mechanisms for advanced remote control.
  • Extended Mechanical Lifecycle: Built for heavy commercial use, delivering an exceptional mechanical life of up to 20,000 cycles for the 250AF/320AF frames.

Operating & Environmental Conditions

The EKM6DC molded case breaker is heavily optimized for extreme environments. It performs reliably at altitudes up to 5500m and operating temperatures from -40°C to +70°C. It is completely safe to operate in mediums without explosion risks, provided the atmosphere is free from highly corrosive gases and conductive dust.

Commercial Applications for the DC MCCB Breaker

Deploying the EKM6DC secures vital high-capacity direct current nodes, acting as a highly dependable molded case breaker for utility-scale solar infrastructures.

Applications & Use Cases

  • Utility-Scale Solar Arrays: Functions as the primary molded case breaker within central combiner boxes, safely aggregating massive 1500VDC strings.
  • Energy Storage Systems (ESS): Isolates heavy-duty commercial battery banks securely, managing intense charge and discharge cycles up to 800A.
  • High-Voltage Industrial DC Networks: Protects specialized manufacturing equipment and traction networks operating on massive direct current, ensuring flawless fault isolation.

Technical Specifications for the DC MCCB Breaker

Evaluate the exact voltage ratings and massive breaking capacities below to seamlessly integrate this DC MCCB Breaker into your heavy-duty DC distribution panels.

General & Electrical Data (IEC 60947-2)

Model EKM6DC-250/320 EKM6DC-400 EKM6DC-630 EKM6DC-800
2P 3P 2P 3P 2P 3P 2P 3P
Rated frame current Inm (A) 250, 320 400 630 800
Rated current In (A) 63 – 320 225 – 400 500, 630 700, 800
Rated operational voltage Ue (VDC) 500 1000, 1500 250/500, 750/1000, 1250/1500 1250/1500 250/500, 750/1000, 1250/1500 1250/1500 250/500, 750/1000, 1250/1500 1250/1500
Rated insulation voltage Ui (V) 1250 1500 1500 1500 1500
Rated impulse withstand (Uimp) 8kV 12kV 12kV 12kV 12kV
Rated ultimate short-circuit breaking capacity Icu (kA)
H Type 50 20, 20 70, 40, 20 20 (3P), 40 (3P) 70, 40, 20 20 (3P), 40 (3P) 70, 40, 20 20 (3P), 40 (3P)
R Type – – 85, 60, 40 40 (3P), 50 (3P) 85, 60, 40 40 (3P), 50 (3P) 85, 60, 40 40 (3P), 50 (3P)
Rated service capacity Ics (kA) 100% Icu
Mechanical life (Times) 20,000 10,000 5,000
Electrical life (Times) 1500 ~ 3000 700 ~ 1000 500 ~ 1000 500 ~ 1000
Instantaneous tripper 10In
Arcing distance (mm) ≤50 (Zero arc, with arcing cover)

Action Characteristic Curve

EKM6DC Action Characteristic Curve

Modular Accessories for the DC MCCB Breaker

Expand the operational capabilities of your DC panel by seamlessly integrating these dedicated EKM6DC remote signaling and tripping modules.

Product Accessories:

EKM6DC Product Accessories

  1. Ontology (Main Circuit Breaker Body)
  2. Undervoltage Release (Customer purchase)
  3. Shunt Release (Customer purchase)
  4. Alarm Contact (Customer purchase)
  5. Auxiliary Contact (Customer purchase)
  6. Electric Operating Mechanism (Customer purchase)
  7. Hand-Operated Mechanism (Customer purchase)
  8. Terminal Guard (Customer purchase)
  9. Front Wiring Board (Customer option)
  10. Arc Partition (Standard with the main body)

Accessory Table

EKM6DC Accessory Table

Auxiliary Contact & Combination

Auxiliary Contact Current Parameters
Rated current of shell frame class Agreed heating current Rated operating current at AC400
Inm < 250 3A 0.3A
Inm > 400 6A 0.4A

Auxiliary contact and its combination

Auxiliary contact and its combination

Alarm Contact

Auxiliary contact and its combination

Alarm Contact Auxiliary contact and its combination alarm

Shunt Release Integration

Generally installed in the circuit breaker A phase. Between 70% – 110% of the rated control power supply voltage, the distributor shall reliably buckle the circuit breaker under all operating conditions.

Control voltage: General: DC 24V, 100V, 220V. Note: When the control circuit power supply is DC24V, it is recommended to use the following figure for the excitation control circuit design.kA: Is a DC24V intermediate relay with a contact current capacity of 1A. The micro switch in series between the K tap and the coil is a normally closed contact. When the circuit breaker is disconnected, the contact is disconnected by itself and closed when the breaker is closed.

Wiring diagram of excitation tripping

Wiring diagram of excitation tripping

Installation Method and Overall Dimension of External Accessories

Turning the operating handle mechanism type and specification
Model Installation dimension (mm) Operator handle relative to circuit breaker center value(mm)
A B H D
CZ2-320/EKM6 157 35 55 50-150 0
CZ2-400/EKM6 224 48 78 50-150 ±5

Turning the operating handle mechanism type and specification

Turning the operating handle mechanism type and specification
Model H B B1 A A1 D
EKM6-320 188.5 116 126 90 35 4.2
EKM6-400 244 176 194 130 48 6.5

Turning the operating handle mechanismtype and specification

Electric power operator mechanism wiring diagram

Electric power operator mechanism wiring diagram

Dimensions and Wiring of the DC MCCB Breaker

Verify the exact modular footprints and heavy-duty terminal spacing below to guarantee perfect panel fitment for this DC MCCB Breaker.

DC Circuit Breaker Connection Mode

DC Circuit Breaker Connection Mode EKM6DC

Overall Dimensions and Mounting Dimensions (mm)

EKM6DC-250/320

EKM6DC-250/320

EKM6DC-400/630/8002P

EKM6DC-400/630/8002P

EKM6DC-400/630/8003P

EKM6DC-400/630/8003P

EKM6 with arc cover installation drawing

Model Arcing cover length: A Total length: B
EKM6DC-320 64 245
EKM6DC-400/630/800 64 314

EKM6 with arc cover installation drawing EKM6DC

Safe Distance During Circuit Breaker Installation

Safe Distance During Circuit Breaker Installation EKM6DC

Model L A B C E
Without zero arcing cover With zero arcing cover Without zero arcing cover With zero arcing cover
EKM6DC-250 40 50 – 25 25 50 –
EKM6DC-320 40 50 65 25 25 50 130
EKM6DC-400 70 100 65 25 25 100 130
EKM6DC-630 70 100 65 25 25 100 130
EKM6DC-800 70 100 65 25 25 100 130
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