DC MCB 125A 1200V Non-Polarity Circuit Breaker 6kA

Name: DC MCB 125A 1200V EKM3-125DC 6kA - ETEK Electri
SKU: EKM3-125DC

Engineered strictly for high-voltage photovoltaic arrays and commercial energy storage, this DC MCB 125A delivers ultra-precise thermal-magnetic protection. The EKM3-125DC series functions as an exceptionally robust non-polarity dc breaker 100 amp, physically eliminating directional wiring constraints to ensure rapid, fail-safe deployment across demanding direct current infrastructures.

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ModelEKM3-125DC

CategoryDC Mini Circuit Breaker, Circuit Breakers

AvailabilityIn stock

CE & TUV certified
Worldwide shipping
OEM & ODM support

Product Features of the DC MCB 125A

Constructed from environmentally resilient materials, this DC MCB 125A integrates dependable arc suppression to maintain long-term structural and electrical integrity under extreme loads.

Non-Polarized Architecture: Eliminates strictly directional wiring requirements, ensuring the mcb dc 100a installs effortlessly without severe reverse polarity risks.
Heavy-Duty High Voltage: Operates seamlessly up to 1200VDC across 4 poles, decisively isolating severe fault currents with a 6kA ultimate short-circuit breaking capacity (Icu).
Extended Mechanical Lifecycle: Outperforms standard industry expectations, delivering an actual mechanical life exceeding 10,000 cycles.
Touch-Safe Design: Features IP20 finger-protected wiring ports, preventing hazardous operator contact during active B2B panel maintenance.
External Bridging Ready: Facilitates efficient commercial panel routing using specialized external bridging busbars tailored for complex multi-pole setups.

External Bridging Busbar Integration

Configure the external bridging busbars exactly as required by the specialized DC circuit diagrams for optimal current routing.

External Bridging Busbar dc mcb 125a

Commercial Applications for the DC MCB 125A

Deploying the EKM3-125DC secures critical high-capacity direct current nodes, establishing a highly dependable isolation framework for commercial solar infrastructures.

Applications & Use Cases

Energy Storage Systems (ESS): Isolates heavy-duty commercial battery banks securely, managing intense charge and discharge cycles effortlessly.
Photovoltaic Combiner Boxes: Functions as the primary dc breaker 100a, safely aggregating and safeguarding multiple high-voltage solar string inputs.
Industrial DC Networks: Protects specialized manufacturing equipment operating on direct current, ensuring flawless zero-interruption fault isolation up to 125A.

Technical Specifications with the DC MCB 125A

Evaluate the comprehensive thermal-magnetic tolerances below to seamlessly integrate this high-capacity DC MCB 125A into your specialized direct current electrical panels.

General & Electrical Data (IEC/EN 60947-2)

Electrical & Protection Specifications
Protection	Overcurrent and short circuit	Type of trip	Thermal-magnetic
No. of poles	1P, 2P, 3P, 4P
Rated voltage (Ue)	1P: 300VDC \| 2P: 600VDC \| 3P: 900VDC \| 4P: 1200VDC
Rated currents (In)	80, 100, 125A
Rated insulation voltage (Ui)	1200V	Rated impulse withstand (Uimp)	6kV (1.2/50μs)
Rated ultimate capacity (Icu)	6kA	Rated service capacity (Ics)	6kA
Mechanical & Environmental Data
Electrical life (Standard)	200 Cycles (Actual: >1,000)	Mechanical life (Standard)	9,700 Cycles (Actual: >10,000)
Ingress protection	IP40 (Wiring port IP20)	Pollution degree / Overvoltage	3 / Category 3
Operating ambient temp.	-25°C ~ +55°C	Storage ambient temp.	-30°C ~ +70°C
Terminal connection type	Cable	Max. terminal size	35mm² flexible / 50mm² rigid

Tripping Characteristics & Altitude Derating

The instantaneous magnetic tripping parameters operate cleanly across Z, L, and K curves for specialized heavy-duty DC isolation.

Tripping Characteristic dc mcb 125a

Tripping Characteristic Rules (In = 80-125A)
Thermal Tripping	1.05In: no tripping within 2h \| 1.30In: tripping within 2h
Overload Interruption	I = 2.55In, 1s < t < 120s
Instantaneous Z Curve	(3 – 5) × In
Instantaneous L Curve	(6 – 10) × In
Instantaneous K Curve	(10 – 14) × In

Derating of Altitude

Altitude (m)	2000	3000	4000	5000
Rated working current coeff.	1	0.96	0.91	0.86
Rated work voltage coeff.	1	1	1	1
Power-frequency dielectric strength	1	0.90	0.82	0.71
Rated impact tolerance voltage (Uimp)	1	0.90	0.82	0.71
Rated short-circuit capacity & Life	1	0.82	0.70	0.60

Temperature Derating Table

Use the correction factors below to accurately adjust the continuous rated current based on ambient installation temperatures.

Rated Current (A)	Correction Factor for Ambient Temperature (1)
Rated Current (A)	-30°C	-25°C	-20°C	-15°C	-10°C	-5°C	0°C	5°C	10°C	15°C
80-125A	1.242	1.223	1.204	1.182	1.161	1.143	1.127	1.103	1.079	1.063

Rated Current (A)	Correction Factor for Ambient Temperature (2)
Rated Current (A)	20°C	25°C	30°C	35°C	40°C	45°C	50°C	55°C	60°C	65°C
80-125A	1.047	1.00	0.984	0.968	0.952	0.922	0.904	0.891	0.872	0.844

Dimensions and Wiring of the DC MCB 125A

Verify the exact 35mm DIN rail footprints and modular high-current terminal configurations below to guarantee perfect panel fitment for this DC MCB 125A.