250A protective enclosure for Pylontech battery
250A protective enclosure for Pylontech battery
250A protective enclosure for Pylontech battery
250A protective enclosure for Pylontech battery

250A Bipolar DC Protection Box for Pylontech Lithium Batteries

By Julien Mawet · Solar PV Expert at Wattuneed • Updated April 2026
CFA291,287.09
Tax included
Coffret-protection-250A-Pylontech
0768563823800

The 250A protection box is a robust electrical safety interface designed to protect high-capacity battery banks. This product is a DC disconnect box used to isolate and protect your batteries against overloads and accidental short circuits.

This accessory is specifically compatible with Pylontech batteries (US2000C, US3000C and US5000 series). This device secures the connection between the battery bank and the inverter by integrating seamlessly with high-power systems operating at 48V, such as Victron MultiPlus-II inverter-chargers or WKS solutions.

Equipped with a 250A isolator, this enclosure also facilitates maintenance operations by allowing the circuit to be physically disconnected without disconnecting the cables. Its robust housing provides durable mechanical protection for the heavy-gauge cables, which are essential for withstanding high discharge currents.

Technical advantages of the enclosure:

  • Breaking capacity: 250A rating suitable for rapid discharges from lithium battery banks.
  • Enhanced safety: Effective protection for Pylontech cells and the inverter’s electronics.
  • Simplified maintenance: Integrated disconnect switch for rapid and safe power disconnection.
  • Compliance: Meets safety requirements for residential energy storage installations.

Pylontech 250A Dual-Pole DC Battery Protection Box – Ready for Installation


The 250A protection box for Pylontech batteries is a turnkey solution for securing your installations. This box provides full bipolar protection, simultaneously isolating the positive (+) and negative (-) terminals for maximum safety against overloads and short circuits.





Contents of the box

This box is supplied complete, pre-wired and ready to install:

  • IP65 enclosure: Total protection against dust and water splashes.
  • 2P 250A DC1000V bipolar circuit breaker: Simultaneous protection of both polarities.
  • 2 x 50 mm² cables with terminals: Direct and robust connection to the inverter.
  • 2 pairs of Pylontech battery cables: Specific connectors for a secure connection.





How the cabinet works

The cabinet centralises and secures the energy flow of your battery bank:

  • The Pylontech batteries are connected to the cabinet via dedicated connectors.
  • Bipolar protection: The circuit breaker disconnects both lines, ensuring there is no residual current in the event of a power cut.
  • Power is distributed steadily to the inverter via the 50 mm² cables.

Principle: By disconnecting both poles simultaneously, this system provides true galvanic isolation, protecting the user and the inverter’s electronics.





Typical applications

  • Installations with Pylontech US2000 / US3000 / US5000 batteries.
  • Modular storage systems requiring reliable isolation.
  • Bipolar protection for hybrid systems (Victron, WKS, etc.).





Compatibility with inverters 

  • WKS Evo Circle Pro 6.5 kW and WKS MAX II 10 kW
  • Deye 3 kW to 12 kW
  • Victron and Sofar





Advantages of the box

  • Bipolar safety: Simultaneous disconnection of (+) and (-) for enhanced protection.
  • Turnkey solution: Enclosure, Pylontech connectors and circuit breaker included.
  • Quick installation: ‘Plug & Play’ connectors specifically designed for Pylontech batteries.
  • Safe maintenance: Resettable circuit breaker allowing the battery bank to be completely isolated.





Commissioning

  1. Check that the bipolar circuit breaker is in the OFF position.
  2. Connect the battery cables to the Pylontech packs.
  3. Connect the 50 mm² cables to the inverter.
  4. Ensure correct polarity (+ red, - black) on both poles.
  5. Switch the circuit breaker to ON to activate the protection.

For further details, please refer to our Pylontech installation guide.





Safety and maintenance

  • Bipolar cut-off: Magnetic and thermal isolation on both DC lines.
  • 50 mm² cables: Cross-section suitable for handling 250A without overheating.
  • Maintenance: Periodic visual inspection and manual testing of the circuit breaker.





FAQ - Pylontech 250A Bipolar DC Protection Box

1. Why is bipolar disconnection essential for my Pylontech batteries? +
The bipolar protection simultaneously disconnects the positive (+) and negative (-) terminals. This ensures true galvanic isolation: in the event of a disconnection, no residual current flows between the battery and the inverter, thereby protecting the user and sensitive electronic components against any insulation failure.
2. Is this box compatible with US5000 batteries? +
Absolutely. This box is universal for Pylontech’s low-voltage range. It is perfectly suited to the US2000, US3000 and US5000 models. It includes specific “Plug & Play” connectors to ensure a safe and immediate connection with these packs.
3. Which brands of inverters can I use this box with? +
The box is designed for broad compatibility with market-leading hybrid inverters. It works perfectly with the Deye range (3kW to 12kW), WKS (Evo Circle Pro, MAX II), as well as with Victron and Sofar systems.
4. Is the 50 mm² cable cross-section sufficient for 250A? +
Yes, the 50 mm² cables supplied are specifically rated to handle high currents of up to 250A DC. This cross-section minimises voltage drops and prevents the conductors from overheating, thereby ensuring optimal performance of your storage system.
5. Can I install this box in a damp utility room? +
The box has an IP65 protection rating. This means it is completely dust-tight and protected against water jets. It is therefore perfectly suited to garages, battery rooms or technical shelters, ensuring the longevity of the internal 250A circuit breaker.
6. What maintenance does the protection device require? +
The box requires little maintenance. We recommend an annual visual check of the terminal connections and a periodic manual test of the circuit breaker (switch to OFF then ON) to ensure that the thermal and magnetic mechanisms remain fully operational.
Coffret-protection-250A-Pylontech

Data sheet

Type of electrical equipment
Protection box

Specific References

UPC
768563823800
EAN13
0768563823800
MPN
Coffret-protection-250A-Pylontech

You might also like

250A Bipolar DC Protection Box for Pylontech Lithium Batteries — Mounting and accessories

250A Bipolar DC Protection Box for Pylontech Lithium Batteries by Pylontech is available in our Mounting and accessories catalog. Technical specifications: type of electrical equipment: Protection box. Product weight: 6.0 kg.