China ARM5 series drawer base Supplier, Factories

The drawer holder of a molded case circuit breaker is a specialized structural component for installation, operation, and maintenance of the MCCB body. It belongs to modular distribution accessories, and its core is to transform a fixed MCCB into a drawer style withdrawable structure. It is widely used in low-voltage distribution cabinets, switchgear, industrial distribution panels, building power distribution, and other scenarios, solving the pain points of fixed circuit breakers from four dimensions: installation, operation, safety, and system expansion.

Product Description

Core Role

  • Realize Three Position Switching

    There are three positions for connection, testing, and extraction: the connection position provides normal power supply; the main circuit of the test site is powered off and the secondary circuit is powered on, which can be safely debugged; pull out the position and completely physically disconnect, forming a visible power outage breakpoint.

  • Safe Isolation

    After extraction, there is a clearly visible insulation gap, and there is no risk of electric shock or misoperation during maintenance, meeting electrical safety regulations.

  • Quick Maintenance and Replacement

    Without dismantling the main and secondary cables, the circuit breaker body can be directly removed for maintenance and replacement without damaging the cabinet wiring.

  • Anti Misoperation Interlock

    Only when the circuit breaker is opened can it be pulled in and out, and the connection cabinet door cannot be opened to avoid load insertion and accidental contact with live parts structurally.

  • Integrated Transfer Circuit

    Integrate auxiliary contacts, shunt/undervoltage trip and other accessories, unify the transfer of main circuit and secondary line, simplify cabinet wiring.

Main Advantages

  • Safer Operation and Maintenance

    Providing visible isolation breakpoints, combined with mechanical interlocking, significantly reducing the risk of electric shock and arc during maintenance.

  • High Maintenance Efficiency

    No need to disconnect the wires, and the replacement time for circuit breakers has been reduced from several hours to just over ten minutes.

  • Uninterrupted Power Supply

    Critical circuits can quickly replace backup circuit breakers, suitable for scenarios such as factories and data centers where power outages cannot last for a long time.

  • Modular Universality

    Circuit breakers of the same specifications are interchangeable, spare parts are unified, and later expansion and renovation are more flexible.

  • Neat Wiring

    Using contact plugs, the cabinet's wiring is organized, and the heat dissipation and insulation are better.

ARM5/ARM5E(i) drawer base dimensions and installation dimensions

ARM5 Series POPB Installation Dimension Drawing
Figure 1 ARM5 Series POPB Installation Dimension Drawing
Adapt to MCCB Poles Overall dimensions Installation dimensions
L1 L2 L3 H1 H2 H3 W1 W2 W3 Φd1 Φd2 A B Φd2
M5-160/250, M5E(i)-160/250 3P 199 217.6 124 180.5 17 38.5 35 176.5 70 8.5 M5 70 75 6
M5-400/630, M5E(i)-400/630 3P 313 340 206 268 23 85 45 215 90 11 M6 100 150 7

MCCB Production Line Real Showing

Frequently Asked Questions (FAQ)

What are the three switching positions on the drawer base?

The drawer base features three distinct physical positions: Connection (for normal power supply), Test (main circuit is disconnected but secondary circuit remains powered for safe debugging), and Extraction (completely disconnected physically to form a visible power outage breakpoint for maintenance).

How does the drawer base improve maintenance safety?

It provides a clearly visible insulation gap when pulled to the extraction position, eliminating the risk of electric shock or misoperation. Additionally, the integrated mechanical interlock ensures that the circuit breaker can only be racked in or out when it is fully opened.

Can circuit breakers be replaced without rewiring?

Yes. Because the drawer base features contact plugs, you do not need to dismantle any main or secondary cabinet cables. The circuit breaker body can be removed directly, reducing replacement time from hours to just over ten minutes.

Are different circuit breakers interchangeable in the same base?

Circuit breakers of the same specifications feature modular universality and are fully interchangeable. This simplifies spare parts inventory and makes future line expansions or system renovations highly flexible.

What is the advantage of the integrated transfer circuit?

It integrates vital accessories like auxiliary contacts and shunt/undervoltage trips into a single unified transfer interface. This drastically simplifies cabinet wiring, resulting in cleaner wire layouts, better heat dissipation, and improved overall insulation.

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