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Low Voltage Draw-out Switchgear

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Low Voltage Draw-out Switchgear

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Certification :	GB7251.1、ZBK36001、IEC439
Brand Name :	ChangYun
Model Number :	GCK,GCS,MNS

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Low Voltage Draw-out Switchgear

Low-Voltage Draw-Out Switchgear

Modular | Safe | Intelligent | IEC/GB Compliant

Overview

This low-voltage withdrawable switchgear (MCC) is designed for power distribution and motor control in industrial, commercial, and infrastructure projects. The drawer units adopt a standardized modular architecture supporting live hot-swap replacement, minimizing system downtime. Mechanical interlocks enforce three distinct positions – Connected, Test, and Disconnected – enabling isolated maintenance of faulty circuits without a full power shutdown.

Key Technical Features

1. Draw-Out Mechanism with Positive Interlocking

Three-position drawer: Connected (power circuit closed), Test (control circuit closed, main circuit isolated), Disconnected (fully isolated).
Mechanical interlock between drawer operating handle and compartment door: door can only be opened when handle is in Disconnected position.
Interchangeable drawer units of same rating – no special adjustment required for replacement or expansion.

2. Robust Construction & Material Standards

GCK series: Compact, cost-effective, widely used in general industrial distribution.
GCS series: High-strength section steel frame, deeper drawer compartments, able to accommodate higher-rated components (e.g., 630A and above); superior short-circuit withstand capacity (up to 100kA).
MNS series: C-section steel framework (forming a self-supporting structure), high circuit density (up to 36 circuits per cubicle), supports double-sided operation for space-constrained E-house applications.

3. Compartment Segregation & Arc Protection

Physically separated compartments: Busbar compartment (top), Electrical compartment (front), Cable compartment (rear/bottom). Separators are made of steel or flame-retardant insulating plates.
Busbars are covered with flame-retardant insulating sleeves or shields to mitigate arc-flash risks.
Protection rating: IP30 / IP40 (selectable), preventing ingress of solid foreign objects ≥2.5mm or ≥1.0mm.

4. Safety Interlocks & Misoperation Prevention

Drawer mechanical interlock (prevents moving between positions unless handle is correctly operated)
Door interlock (door locked when drawer is in Connected or Test position)
Anti-misoperation shutter mechanism (automatically covers live fixed contacts when drawer is withdrawn)

5. Intelligent & Expandable Architecture

Reserved slots for intelligent monitoring modules (current, voltage, power, temperature, contactor status).
Supports three-remote functions – remote signaling, remote measurement, remote control – for integration into SCADA or power automation systems.
Optional communication protocols: Modbus RTU, Profibus, IEC 61850 (upon request).
Compatible with mainstream low-voltage components (ACB, MCCB, contactors, soft starters, VFDs) from ABB, Schneider, CHINT, etc.
Custom engineering available: special copper layouts, N+1 redundancy, form of internal separation (Form 3b/4b).

6. Standardized & Flexible Configuration

Standardized modular hole patterns for mounting devices – strong universality of auxiliary components.
Mixed configuration: withdrawable drawers and fixed compartments can be combined within the same cabinet.
Top-mounted busbar bridge optional for top or bottom cable entry/exit.

Technical Specifications (Typical)

Parameter	Value
Rated insulation voltage (Ui)	690V / 1000V (optional)
Rated operational voltage (Ue)	380V, 400V, 415V, 690V
Rated impulse withstand voltage (Uimp)	8kV / 12kV
Rated frequency	50/60Hz
Rated short-time withstand current (Icw)	50kA / 80kA / 100kA (1s)
Rated peak withstand current (Ipk)	105kA – 220kA
Protection degree	IP30, IP40 (IP54 available with special enclosure)
Drawer height module	8E/4, 8E/2, 8E, 16E, 24E (MNS/GCS based)
Max. number of drawers per cubicle	18 (depending on rating)
Applicable standards	IEC 61439-1/2, GB/T 7251.8, GB/T 7251.12

Application Scenarios

Industrial plants (steel, chemical, cement, automotive)
Commercial buildings and data centers
Renewable energy projects (PV combiner boxes, wind power auxiliary systems)
Infrastructure (tunnels, water treatment, airports, metro stations)
Smart factory retrofit with digital O&M backend (real-time temperature/vibration/breaker status monitoring)

Why This Product?

Maximized uptime – Hot-swappable drawers reduce MTTR (Mean Time To Repair) from hours to minutes.
Engineered safety – Three-position interlock + compartment segregation meets highest safety requirements for live working.
Scalable – Add or upgrade circuits without changing the main cabinet.
Global compatibility – Works with major OEM components, certified to international standards.

Typical Applications

Low-voltage power distribution and motor control centers (MCC) in industrial facilities
Low-voltage distribution systems for data centers and commercial buildings
Critical load distribution in metallurgy, petrochemical, and power industries
Automated production lines requiring high reliability and maintainability

Contact our engineering team for a configuration drawing, short-circuit calculation, or a customized quotation.

Low Voltage Draw-out Switchgear

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