250A protective box for Delong battery
250A protective box for Delong battery
250A protective box for Delong battery
250A protective box for Delong battery

250A Dual-Pole DC Protection Box for Delong / Leapton Lithium Batteries

£366.96
Tax included
Coffret-protection-250A-Delong-Leapton
0768563823817

The 250A bipolar DC protection box is the central safety component for your energy storage systems. Designed specifically for Delong and Leapton batteries, this unit ensures complete isolation by simultaneously disconnecting the positive (+) and negative (-) terminals.

The major advantage of this bipolar protection lies in its ability to completely isolate the circuit: unlike conventional protection, it ensures that no residual current flows during shutdown, thereby protecting the user and the inverter from electric arcs and insulation faults. This device is essential for preserving the lifespan of your lithium cells against overcharging.

Equipped with a robust 250A circuit breaker, it withstands current spikes without overheating. Its omnipolar manual cut-off allows you to work on the installation with complete peace of mind.

Technical features:

  • Bipolar safety: Simultaneous disconnection of the (+) and (-) terminals for true galvanic isolation.
  • 250A rating: Ideal for high-power discharges in lithium battery banks.
  • Full protection: Thermal and magnetic trip on both poles.
  • Robust design: IP65-rated waterproof housing suitable for demanding environments.
  • Ready to use: Internal terminal blocks for large-gauge cables (up to 95mm²).

250A Dual-Pole DC Protection Box for Delong and Leapton Batteries – Ready to Install


The 250A protection box for Delong and Leapton batteriesis a turnkey solution for securing your energy storage systems. This box provides comprehensive bipolar protection, simultaneously isolating the positive and negative terminals to ensure maximum safety against overloads and short circuits.





Contents of the box

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

  • IP65 enclosure: Robust housing offering total protection against dust and water splashes.
  • 2P 250A DC1000V bipolar circuit breaker (TOMZN - TOM7Z): The central safety device enabling the simultaneous disconnection of both polarities.
  • 2 x 1 m 95 mm² cables with terminals: Secure and optimised connection to the inverter. 
  • 4 x 1.50 m 50 mm² cables with terminals: High-performance connection for linking your Delong or Leapton battery packs to the enclosure.





How the cabinet works

The cabinet is designed to reliably centralise and protect the DC current:

  • The Delong or Leapton batteries are connected to the cabinet via the 4 x 50 mm² cables.
  • Bipolar protection: The 250A 2P circuit breaker acts on both lines (+ and -), ensuring that no residual current flows in the event of a cut-out.
  • The two 95 mm² cables then distribute the power stably to the inverter.

Safety principle: By disconnecting both poles simultaneously, this bipolar box provides true galvanic isolation, protecting the user and the inverter’s electronics from any insulation faults.





Typical applications

  • Residential or commercial installations equipped with Delong and Leapton lithium batteries.
  • Modular storage systems connected in parallel requiring safe isolation.
  • Essential bipolar protection for hybrid PV installations and off-grid sites.





Advantages of the box

  • Bipolar safety: Simultaneous disconnection of the (+) and (-) terminals for enhanced protection.
  • Turnkey solution: Enclosure, high-capacity cabling and circuit breaker included.
  • Quick installation: Internal terminal blocks and cables pre-fitted with terminals.
  • DC compliance: Equipment specifically calibrated for high-intensity direct currents (250A).
  • Safe maintenance: Allows the battery bank to be completely isolated during maintenance work.





Commissioning

  1. Check that the double-pole circuit breaker is in the OFF position.
  2. Connect the 95 mm² cables to the battery terminals.
  3. Connect the 50 mm² cables to the DC inputs of the inverter.
  4. It isessential to observe the correct polarity (+ red, - black) on both poles of the circuit breaker.
  5. Switch the circuit breaker to the ON position to energise the system.





Safety and maintenance

  • 250A 2-pole circuit breaker: Resettable magnetic and thermal protection on both poles.
  • Optimised cabling: 95 mm² and 50 mm² cross-sections to minimise voltage drops and overheating.
  • IP65 rating: Suitable for technical environments (battery rooms, garages).
  • Maintenance: Periodic check of terminal tightness and testing of the circuit breaker’s trip button.





FAQ - Delong 250A Battery Protection Box

1. Why is bipolar protection essential for my Delong batteries? +
Bipolar protection allows the positive (+) and negative (-) lines to be cut off simultaneously. This is a vital safety feature for high-power lithium installations as it guarantees total galvanic isolation. In the event of a fault, no residual current can flow, thus protecting the inverter and the user against insulation faults.
2. Why does the cabinet use two different cable cross-sections (95 mm² and 50 mm²)? +
The 50 mm² cables are used to connect each Delong battery pack to the cabinet, a cross-section perfectly suited to the individual current rating of the modules. The 95 mm² cables are used for the main connection between the cabinet and the inverter, as they must carry the combined current of 250A whilst minimising voltage drops and heat build-up.
3. Is this cabinet ready for use upon receipt? +
Yes, it is a ‘turnkey’ solution. The cabinet is delivered pre-wired with a 250A RCD already installed. The package also includes 95 mm² and 50 mm² cables pre-fitted with terminals, which significantly reduces installation time and eliminates the need for specialist crimping tools.
4. Can I install this protective enclosure outdoors? +
The enclosure has an IP65 protection rating, making it completely dust-tight and resistant to water jets. It can therefore be installed in demanding technical environments such as a garage, a battery room or a sheltered outdoor area, whilst ensuring the safety of the internal equipment.
5. What should I do if the circuit breaker trips? +
The 250A double-pole circuit breaker is a resettable device. If it trips, this indicates an overload or a short circuit. Identify and rectify the cause of the fault in your inverter or battery system before simply resetting the lever to restore power to the system.
6. What maintenance is required for this enclosure? +
For long-term safety, we recommend periodically checking that the terminals and terminal blocks are tight (charge/discharge cycles can cause slight thermal expansion). It is also advisable to manually test the circuit breaker’s trip mechanism once a year using its test button.
Coffret-protection-250A-Delong-Leapton

Data sheet

Type of electrical equipment
Protection box

Specific References

UPC
768563823817
EAN13
0768563823817
MPN
Coffret-protection-250A-Delong-Leapton

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