Modular DC miniature circuit breaker | DC MCB | 1P | 250 A | 120 V DC | DIN | for solar modules, battery banks and inverters | E1P-DC120V-250A

Name: Modular DC miniature circuit breaker | DC MCB | 1P | 250 A | 120 V DC | DIN | for solar modules, battery banks and inverters | E1P-DC120V-250A
SKU: E1P-DC120V-250A
Price: 36.83 EUR
Availability: InStock

Code: E1P-DC120V-250A

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The E1P-DC120V-250A is a single-pole modular DC miniature circuit breaker rated 250 A, 120 V DC, mounted on a DIN rail. It is designed to protect high-current DC circuits: battery banks, low-voltage (12/24/48 V) inverter inputs, solar power plant battery connections, and DC distribution busbars against overload and short circuit.

Product description

Modular DC miniature circuit breaker | DC MCB | 1P | 250 A | 120 V DC | DIN | for solar modules, battery banks and inverters | E1P-DC120V-250A

The E1P-DC120V-250A is a single-pole modular DC miniature circuit breaker rated 250 A, 120 V DC, mounted on a DIN rail. It is designed to protect high-current DC circuits: battery banks, low-voltage (12/24/48 V) inverter inputs, solar power plant battery connections, and DC distribution busbars against overload and short circuit.

Key idea:
In battery systems, currents are measured in hundreds of amps, and a short circuit at a lithium battery bank means welded contacts and fire within seconds. A standard AC breaker cannot extinguish a DC arc. This breaker is built specifically for direct current: it has a proper arc-quenching chamber and a 250 A rating, so a single device is enough for a 5–12 kW inverter.

Rated current
250 A

Rated voltage
120 V DC

Poles
1P

Mounting
35 mm DIN rail

How it works

The breaker is wired into the positive (or negative, depending on the system design) DC conductor between the battery and the inverter or DC distribution. The thermal trip responds to a sustained overload, the magnetic trip responds to short-circuit current, and the mechanism disconnects the circuit within milliseconds.

A direct current arc does not extinguish on its own the way an AC arc does, so the breaker contains an arc-quenching chamber and a permanent magnet that stretch and break the arc. Because of this design, it is essential to observe the marked polarity (+ / –) and current direction – a breaker connected the wrong way round may fail to quench the arc.

What makes the E1P-DC120V-250A worthwhile?
It serves as both a protective device and an isolator switch: with one motion you can safely disconnect the battery bank from the inverter for servicing, while the breaker trips automatically in a fault. The modular housing fits into a standard panel alongside other DIN-rail devices.

Technical specifications

Model	E1P-DC120V-250A
Product type	DC miniature circuit breaker (DC MCB)
Number of poles	1P
Rated current In	250 A
Rated voltage Ue	120 V DC
Tripping characteristic	Type C
Arc quenching	Arc chamber with permanent magnet, polarised
Mounting	35 mm DIN rail
Module width	1.5 modules (27 mm)
Dimensions (W x H x D)	27 x 80 x 50 mm
Terminals	Screw type, up to 70–95 mm²
Recommended conductor for 250 A	≥ 95 mm² Cu (depending on installation conditions)
Operating temperature	-25…+55 °C
Standard	IEC/EN 60947-2
Application	Battery banks, 12/24/48 V inverters, DC busbars, PV battery circuits

Key features

Overload protection – the thermal trip disconnects the circuit when current exceeds 250 A for a sustained period.
Short-circuit protection – the magnetic trip responds within milliseconds.
DC arc quenching – a dedicated chamber built for a direct current arc, not an adapted AC device.
Manual isolator – allows the battery to be safely disconnected while servicing the inverter.
DIN mounting – fits into a standard panel, no separate enclosure needed.
High-current terminals – accept a thick conductor or a cable lug without adapters.

Where is it used?

Home solar power plants with batteries (hybrid and off-grid systems)
48 V lithium battery banks feeding 5–12 kW inverters
12/24 V DC distribution in campervans, boats and yachts
-48 V DC power supply for telecommunications and server equipment
Battery circuits of electric forklifts and machinery
UPS and emergency power battery connections
Portable power stations and "powerwall"-type battery assemblies
DC circuits for welding and electroplating equipment

Use by need

For the domestic user.
If you're building a home battery system with a 48 V inverter, this is the protection between the battery and the inverter that the system cannot operate safely without.

For businesses and industry.
In DC distribution boards, a 250 A breaker covers the protection of a single high-power load or busbar branch and allows the circuit to be safely isolated for servicing.

For electricians / engineers.
When selecting, check three things: system voltage ≤120 V DC, calculated short-circuit current ≤ the breaker's breaking capacity, and that the conductor matches the 250 A rating. For systems requiring both poles to be switched (+ and –), use two single-pole units or a 2P model.

Practical example

If a 48 V, 10 kWh lithium bank powers an 8 kW inverter (around 170 A nominal, up to 250 A at peaks), the E1P-DC120V-250A is fitted at the positive output of the battery. If the inverter is overloaded or a short circuit occurs in the cable, the breaker disconnects the bank before the BMS even has to react, protecting the conductors from overheating.

Pros

A true DC device – quenches a direct current arc that AC breakers cannot interrupt.
250 A in a single pole – suits powerful inverters without parallel switching.
Dual purpose – protection and manual isolator in one.
Compact – DIN mounting in place of a separate NH switch-disconnector or fuse block.
Resettable – switch back on after tripping, no fuse replacement needed.
Clear labelling – polarity and direction are marked on the housing.

Cons / limitations

Rated up to 120 V DC only – not suitable for high-voltage PV strings (600–1000 V DC), which require a different type of device.
Polarised – connected the wrong way round, the arc may fail to extinguish.
Single-pole – does not disconnect both conductors; often sufficient in earthed systems, but a 2P unit is needed in isolated systems.
250 A calls for a thick conductor and suitable lugs – installation is not a "DIY" job.
Limited breaking capacity – very large lithium banks may need an additional fuse.

Safety and installation notes

Observe the polarity and current direction marked on the housing – this determines whether the arc is quenched correctly.
Install as close to the battery as possible – keep the unprotected length of cable as short as possible.
Use a ≥95 mm² copper conductor, or size it by calculation; tighten the terminals to the specified torque and re-check after the first load cycle.
Before installation, disconnect the battery and make sure the capacitors in the inverter have discharged.
Leave room for cooling in the panel – a 250 A device generates heat.
In lithium banks, always use this breaker together with BMS protection – it does not replace it.

Quick selection guide

Rated current
250 A

Rated voltage
120 V DC

Poles
1P

Mounting
35 mm DIN rail

Suitable when you need:

to protect a 12/24/48 V battery bank or an inverter input up to 250 A;
a manual DC isolator for servicing;
a modular DIN-rail solution in place of NH fuses.

Check before use:

whether the system voltage is ≤120 V DC;
whether the short-circuit current stays within the breaking capacity;
whether the conductor and lugs match 250 A;
whether the polarity direction is correct.

Important reminder:
The breaker protects conductors and equipment against overload and short circuit – it does not protect against overvoltage, deep discharge or battery cell failure. A surge protective device and a BMS are needed for that.

FAQ

Does it suit a 600 V PV string?
No – it is rated up to 120 V DC only. For strings, use a 500–1000 V DC model.

Can it be used in an AC circuit?
No, the device is designed for direct current only.

Do I need two single-pole units for a 48 V system?
It depends on the system: isolated systems require both poles to be disconnected, while earthed systems are often fine with one.

How thick a cable do I need?
For 250 A, typically ≥95 mm² Cu, refined according to the installation method and cable length.

Does it replace the fuse at the battery?
Often yes, if the breaking capacity is sufficient; for very large lithium systems, a Class T fuse is also recommended.

Can it be connected before the MPPT controller?
Yes, as long as the voltage is ≤120 V DC and the current direction is observed.

Modular DC miniature circuit breaker | DC MCB

The E1P-DC120V-250A is a single-pole modular DC circuit breaker rated 250 A, 120 V DC, DIN-mounted, with a direct current arc-quenching chamber. Designed to protect battery banks, low-voltage inverters and DC distribution in solar power plants, campervans, telecommunications and industrial systems.

Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

CE certificate – a guarantee of safety, quality, and compliance

This product is marked with the CE label, which confirms that it complies with all applicable European Union directives and regulations. CE marking is not just a formality – it is an important indicator of quality and safety, ensuring that the product has been properly assessed, tested, and can be safely used throughout the EU market.

CE certification means that the product has been evaluated according to the main criteria:

Safety requirements – ensures that the product does not pose a risk to the user or the environment
Electromagnetic compatibility (EMC) – the device does not interfere with other equipment and is resistant to external disturbances
Environmental standards – complies with current ecological and material usage requirements
Operational reliability – the product is suitable for long-term use according to its intended purpose

CE marking allows this product to:

be legally supplied and used in all European Union countries
ensure a high level of quality and safety
be used in residential, commercial, and industrial environments

The CE mark is a declaration of the manufacturer’s responsibility, confirming that the product complies with all applicable standards and has been assessed according to EU legislation.

What does this mean for you as a buyer?

Safe use in everyday activities
Reliable performance and reduced risk of failure
Compliance with EU standards and requirements
Suitability for professional solutions