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China Suppliers Factory ARM5 Series Drawer Base for Molded Case Circuit Breaker - Modular Distribution Accessory

The drawer holder for molded case circuit breakers is an essential component designed for the installation, operation, and maintenance of MCCB bodies. As a part of modular distribution accessories, it transforms a traditional fixed MCCB into a convenient drawer-style withdrawable structure. This innovative solution is widely utilized in low-voltage distribution cabinets, switchgear, industrial distribution panels, and building power distribution systems. By addressing critical pain points associated with fixed circuit breakers, it enhances installation, operational efficiency, safety, and system expansion. Trusted by many customers, our China-based factory supplies high-quality drawer holders that meet the diverse needs of various industries.

Product Detail

Core Role

1. 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.

2. 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.

3. Quick maintenance

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

4. 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.

5. 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.

Dimensions and Installation

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

Figure 1 ARM5 Series POPB Installation Dimension Drawing

Adapt to MCCB	Poles	Overall dimensions											Installation dimensions
Adapt to MCCB	Poles	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

Frequently Asked Questions

Q1: What are the three positions of the ARM5 drawer base and how do they function?

The drawer base features three distinct positions: Connection (provides normal power supply), Test (disconnects the main circuit while keeping the secondary circuit powered for safe debugging), and Extraction (completely physically disconnects the unit to form a visible safety breakpoint).

Q2: How does the drawer base improve maintenance safety for operators?

It provides visible isolation breakpoints and mechanical interlocks. This ensures that the circuit breaker can only be inserted or extracted when it is fully opened, preventing accidental contact with live parts and eliminating the risk of electric shock.

Q3: Does replacing the circuit breaker require dismantling the cabinet wiring?

No. The design allows you to directly remove and replace the circuit breaker body without dismantling the main and secondary cables, protecting the cabinet wiring from damage and saving valuable time.

Q4: How much time can be saved during maintenance using the drawer base?

By using the modular plug-in design, the replacement time for a circuit breaker is reduced from several hours (required for standard fixed wiring) to just over ten minutes.

Q5: Are the drawer bases compatible with different MCCB models?

Yes, they are designed with modular universality. Circuit breakers of the same specifications are interchangeable, simplifying spare parts management and allowing flexible system expansion or renovation.