150A Dual-Pole DC Protection Box for Delong / Leapton Lithium Batteries

150A Dual-Pole DC Protection Box for Delong and Leapton Batteries – Ready to Install

The 150A protection box for Delong and Leapton batteries is a turnkey solution for securing your energy storage installations. 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 150A DC1000V bipolar circuit breaker (TOMZN - TOM7Z): The central safety device enabling the simultaneous disconnection of both polarities.
• 2 x 1 m 50 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 direct current:

• The batteries are connected to the enclosure via the 4 x 50 mm² cables.
• Bipolar protection: The 2P 150A circuit breaker acts on both lines (+ and -), ensuring that no residual current flows in the event of a cut-off.
• The two 50 mm² cables then distribute the power steadily 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 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 (150A).
• 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 50 mm² cables to the Delong or Leapton 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

• 2P 150A circuit breaker: Resettable magnetic and thermal protection on both poles.
• Optimised cabling: 50 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.