MS-EBG Medium Voltage Switchgear

Discover the MS-EBG Medium Voltage Switchgear – Mitsubishi Electric‘s latest innovation in safe and reliable energy distribution. Manufactured in Europe and fully compliant with IEC 62271-200 standards, the MS-EBG combines state-of-the-art technology with Mitsubishi Electric‘s industry-leading Vacuum Circuit Breakers and Vacuum Magnetic Contactors to meet the highest demands for quality and performance. Perfect for diverse applications, including power generation, water management, renewables, data centers, and infrastructure, the MS-EBG is designed to deliver robust and future-ready solutions for critical energy needs. Mitsubishi Electric has manufactured over 250,000 medium voltage panels over the last 60 years – the MS-EBG MV Switchgear panel utilizes our highest quality vacuum circuit breaker and vacuum contactor components, including Mitsubishi Electric vacuum interrupters for which Mitsubishi Electric has gained a strong reputation globally. MS-EBG represents an up-to-date and reliable medium voltage panel design, offering fully withdrawable vacuum circuit breakers and contactors to provide maximum availability, fully in line with Mitsubishi Electric’s quality supply and service record resulting in highly satisfied customers all across the globe.

Medium Voltage Switchgear

Withdrawable type
Rated voltage: up to 24kV
Rated busbar current: to 4000A
Rated short-circuit current: up to 40kA (63kA) 1s
IEC 62271-200 conformance
Internal arc classification: AFLR 40kA (50kA)

Combined know-how of >250,000 MV panels manufactured by Mitsubishi Electric since the 1950’s

Our VCB – the Heart of MS-EBG

From 7.2kV/40kA/3150A to 24kV/25kA/2500A
Mechanical operations: 10,000 min
Electrical operations: 10,000 min
IEC 62271-100 conformance
Uses Mitsubishi Electric's own Vacuum Interrupters (VIs) with special
arc diffusing characteristics for long / reliable switching life

Type VPR VCB – culmination of >2.5 million VCBs produced by Mitsubishi Electric since 1982.

Alternative for Industrial MV ACC Applications Vacuum Magnetic Contractor Type VZ-E

Vacuum Magnetic Contractor Type VZ-E

15 years maintenance-free life
Mechanical operations: up to 2.5 million
Electrical operations: > 250,000
3.6kV or 7.2kV Rated Voltage
Up to 400A Rated Current (4kA short-circuit breaking)
IEC 60470 (2000) conformance
Uses low-surge vacuum interrupter, no need for surge protection in most cases

Advantages: lower cost, higher switching lifetimes

Key MS-EBG Specifications
1.	Applicable standard			IEC 62271-200
2.	Switchgear type			Air Insulated metal enclosed switchgears, PM
3.	Rated voltage	U_r	kV	7.2	12	17.5	24
4.	Rated power frequency withstand voltage	U_d	kV rms	20	28	38	50
5.	Rated lightning impulse withstand voltage	U_p	kV peak	60	75	95	125
6.	Rated frequency	f_r	Hz	50/60
7.	Rated normal busbar current	l_r	A rms	4000
8.	Rated short-time withstand current (symmetrical)*	l_k	kA rms	25, 31.5, 40, (50, 63)
9.	Rated duration of short-circuit breaking current*	t_k	second	1, 3
10.	Rated peak withstand current	l_p	kA	50 Hz: 2.5 x , 60 Hz: 2.6 x
11.	Rated short-circuit breaking current*	l_sc	kA rms	25, 31.5, 40, 50
12.	Rated short-circuit making current*	l_mk	kA peak	63, 78.8, 100
13.	Degree of protection: MV compartments, LV compartments	-		IP4X, IP54 (option), IP54
14.	Safety: Internal Arc Classification, Optionial pressure relief duct type (type tested)	-		AFLR, 40kA (50kA) rms 1 sec
15.	Loss of Service Continuity category	-		LSC2B-PM

* rating dependent

Features

High Reliability

Type testing of the MS-EBG was performed by an inderpendent external testing and certification authority, IEL, in Europe. MS-EBG is designed with the benefit of Mitsubishi Electric's vast experience of medium voltage panel production of hundreds of panels over the last 60 years. All components, such as current transformers, voltage transformers, and multi-function relays are made of the highest quality materials. Heat stress analysis of the switch gear structure has led to a heatresistent design in which circuit breakers up to 4000A are self-cooled (i.e. cooling fans not required). Modern design and manufacturing techniques reduces the number of parts which further reduces the chance of failure.

Easy Installation

Installation and testing duration are considerably reduced as the panel is tested and adjusted in the factory and then delivered as a complete unit.

Safety

Safety and reliability are the prime focus of the MS-EBG design using 60 years of Mitsubishi Electric experience in supplying approximately 250,000 panels of the MV switchgear to date. Full type testing to IEC62271-200 of the MS-EBG has been carried out by the independent external testing and certification authority, Electrotechnical Institute (Instytut Elektrotechniki, IEL) in Warsaw, Poland.

Flexible Design

Panels with main circuit and control cable entry from either the top or bottom are available. Partitions between compartments and an automatic shutter system (for withdrawable equipment primary junctions) completely isolate live parts. Safe operation and maintenance is ensured with the adoption of comprehensive interlocking and padlocking mechanisms. In the event of an internal arc fault, the MS-EBG is designed to withstand the huge pressure and scorching effect of the arc (relief flaps located on top of the panel open to limit pressure). Withdrawable equipment is mounted behind the front panel door which is screw-closed, so that any arc proof rating is not compromised (compliant with IEC 62271-200 requirements).

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Construction

The all-metal enclosure is completely earthed. Each compartment (control, withdrawable switching device, busbar and cable termination) is segregated from other compartments by earthed metal partitions. The front of the MS-EBG is divided into 3 compartments. The upper or low-voltage compartment is the control/protecton compartment; the middle section houses the withdrawable equipment, while the bottom compartment can be used for maintenance access to voltage transformers or cable termination. Multi-function relays, meters, protective relays, control switches, etc. are semi-flush mounted on the door of the control compartment.

Internal arc classification (IAC)

For switchgear and controlgear requiring optional Internal Arc Classification to the AFLR standard, a gas exhaust duct must be fitted onto the top of the panel. The gas exhaust duct ensures that in the event of an internal arc fault, any hot gases or vapours are channelled away from personnel in the vicinity of the panel.

The gas exhaust duct may extend to the open air outside the substation. If an arc gas exhaust duct is ordered for this purpose, a straight arc gas exhaust duct extension of two meters beyond the left or right side of the switchboard is incorporated as standard in our delivery (longer extensions to or elbows in the duct can optionally be supplied). The gas exhaust duct is dismantled from the panels prior to shopping and is reinstalled after the panels are installed on site. With the gast exhaust duct, the switchgear and controlgear are designed to protect persons in the event of an internal arc fault of up to 40kA for 1 second. Thus, in the event of internal arcing, there is no ejection of parts, no expulsion of hot gases (except from the gas exhaust duct) and the enclosure remains earthed. Minimum clearance of within the substation of 600 mm, 100 mm and 800 mm from the panel to the room‘s ceiling, side walls and back wall, respectively, are required.