LV Switchgear

MNS Low-Voltage Withdrawable Switchgear

MNS low-voltage withdrawable switchgear uses a modular design for power distribution, motor control and reactive-power compensation. Standardised functional units accommodate different feeder and control duties within one cabinet lineup, while mechanical interlocks guide the prescribed operating sequence of the withdrawable units.

The series serves AC 400/660 V systems, with horizontal busbar ratings up to 5,000 A and short-time withstand options of 50, 65 or 80 kA for 1 second. IP30 and IP40 enclosures are available, with the unit mix, control interfaces and cable access configured around the circuit schedule and switchroom layout.

Technical Specifications

Rated Operating Voltage	400 / 660 V
Rated Insulation Voltage	660 / 1000 V
Rated Frequency	50 / 60 Hz
Horizontal Busbar Current	up to 5000 A
Vertical / Branch Busbar Current	up to 1000 A (vertical busbar)
Short-Time Withstand Current	50 / 65 / 80 kA (1 s) (main busbar)
Peak Withstand Current	105 / 140 / 176 kA (main busbar)
Enclosure IP Rating	IP30 / IP40 (others by request)
Standards	GB 7251.1 / IEC 60439

Key Features

Modular withdrawable functional units.
Mechanical interlocks on the withdrawable units.
For power distribution, motor control and reactive-power compensation.
Standardised components support project-specific configurations.

Typical Applications

Factories and mining sites
Airports and docks
Hotels and broadcasting centres

Installation & Aftercare

Prepare the site, plan routine checks and keep service records.

What needs to be ready before installation?

Lay out the room around the actual section arrangement, with access for module withdrawal and removal of large components.
Match cable entry, busbar connections and earthing to the approved assembly drawings; keep operating aisles free of permanent obstructions.
Control dust and condensation, and provide ventilation that accounts for heat from both busbars and installed devices.

What should operators check during routine rounds?

Observe load indications, alarms and ventilation condition during rounds, and keep the module-to-circuit schedule current.

What is covered during planned maintenance?

At planned isolation, inspect withdrawable contacts, connectors and interlocks; look for damaged plating, deformation and signs of excessive heat.
Use replacement modules matched to the installed interfaces and circuit settings; service contacts and mechanisms with the specified materials.

Customization Options

Define the electrical configuration and the details needed for your site.

Circuit lineup: Incoming, bus-coupler, distribution and motor-control sections to the single-line diagram.
Busbars & fault duty: Main and vertical busbar ratings, neutral arrangement and verified short-circuit duty.
Protection & motor control: Breaker trip functions, motor-starting method, overload protection and control voltage.
Withdrawable units: Drawer sizes and circuit allocation, spare ways, secondary plugs and interlock requirements.
Cable entry & metering: Top or bottom cable routes, terminal space, metering points and requested communication interfaces.

Project-specific options and accessories are confirmed in the quotation and approved drawings.