Product Overview
The ALSTOM MVAJ27L1FB0784Dis a robust,medium-voltage vacuum circuit breaker from ALSTOM’s(now part of GE Grid Solutions)renowned MVAJ series,engineered for high-performance circuit interruption and protection in electrical power distribution systems.This circuit breaker is a critical switching and protection device installed in metal-clad switchgear,designed to reliably make,carry,and break currents under normal circuit conditions,and to make,carry for a specified time,and break currents under specified abnormal circuit conditions such as those of short circuit.The MVAJ27L1FB0784Dutilizes advanced vacuum interruption technology,which provides superior dielectric recovery and minimal maintenance requirements compared to other interruption mediums,making it a preferred choice for utilities and industrial power systems demanding high reliability and long service life.
As a draw-out type circuit breaker,the ALSTOM MVAJ27L1FB0784Dis mounted on a movable truck that allows it to be easily racked into(connected),racked out(test),or fully disconnected(fully withdrawn)from the switchgear housing.This design feature is crucial for operator safety and maintenance efficiency,enabling visual isolation from the high-voltage bus and safe performance of maintenance and testing procedures.The breaker is equipped with comprehensive safety interlocks that prevent unsafe operation,such as closing onto a fault or racking the breaker while it is in the connected position under load.The”MVAJ”series designation typically indicates a specific line of ALSTOM’s vacuum circuit breakers conforming to ANSI/IEEE standards,designed for applications in the 15kV voltage class.
The construction of the ALSTOM MVAJ27L1FB0784Demphasizes durability and operational reliability.It features a stored-energy spring operating mechanism that ensures consistent and rapid opening and closing speeds,independent of manual operator influence.The vacuum interrupters are sealed for life and require no maintenance of the interrupting medium.This circuit breaker is designed to integrate seamlessly with protective relays and control systems,providing automated fault clearing and remote operation capabilities essential for modern power system management and grid stability.
Technical Specifications
Parameter Name
Parameter Value
Product Model
MVAJ27L1FB0784D
Manufacturer
ALSTOM(GE Grid Solutions)
Product Type
Medium-Voltage Vacuum Circuit Breaker
Rated Voltage
15 kV(ANSI)
Rated Frequency
60 Hz(or 50 Hz as specified)
Rated Continuous Current
1200 A or 2000 A(typical for this series)
Short Circuit Interrupting Rating
25 kA or 40 kA(typical)
Rated Short-Time Withstand Current
Specific kA for 4 seconds
Rated Closing and Latching Capability
Specific kA(peak)
Interrupting Medium
Vacuum
Operating Mechanism
Stored-energy spring mechanism
Control Voltage
125 VDC/250 VDC
Insulation Level
ANSI C37.06
Mechanical Life
10,000 operations
Electrical Life
10,000 operations at rated current
Connection Type
Vertical draw-out
Standards
ANSI C37.04,C37.06,C37.09,C37.010
Weight
Approximately 500-700 lbs(227-318 kg)
Main Features and Advantages
The ALSTOM MVAJ27L1FB0784Ddelivers exceptional performance through its vacuum interruption technology.Vacuum interrupters provide rapid arc extinction and excellent dielectric recovery after current interruption,enabling reliable clearing of high fault currents.This technology results in minimal contact erosion,which translates to a long electrical life and significantly reduced maintenance needs compared to air-magnetic or SF6 breakers.The sealed vacuum interrupter is not sensitive to altitude or environmental contamination,ensuring consistent performance over its operational lifetime.
Operational safety and reliability are fundamental advantages of this circuit breaker.The draw-out design allows the MVAJ27L1FB0784Dto be safely isolated and grounded for maintenance.Integrated safety interlocks prevent incorrect sequencing of operations,such as racking the breaker while it is closed or closing it when not fully seated in the connected or test position.The stored-energy spring mechanism provides high-speed,dependable operation for both closing and opening commands,which is critical for successful fault interruption and equipment protection.
The ALSTOM MVAJ27L1FB0784Dis designed for ease of maintenance and long-term reliability.The modular design allows for straightforward inspection and replacement of key components.With a high mechanical life rating,the breaker is built for thousands of operations over many years of service.Its conformance to ANSI/IEEE standards ensures interoperability and replacement compatibility within North American power systems,providing a robust and future-proof solution for medium-voltage power distribution and protection.
Application Field
The ALSTOM MVAJ27L1FB0784Dis primarily deployed in electrical utility substations and large industrial power distribution systems.In utility applications,it serves as a feeder or main breaker in distribution substations,protecting transformers and overhead lines,and ensuring selective coordination to isolate faults while maintaining service to healthy sections of the network.Its high interrupting rating is essential for maintaining grid stability.
In heavy industrial facilities such as steel mills,chemical plants,oil refineries,and mining operations,the MVAJ27L1FB0784Dprotects large motors,transformers,and capacitor banks.It is a critical component in the main medium-voltage switchgear that distributes power throughout the facility.The breaker’s ability to interrupt high fault currents safely is vital for protecting expensive capital equipment and ensuring personnel safety.
Furthermore,this circuit breaker is applied in critical infrastructure such as data centers,hospitals,water treatment plants,and generation stations,where a highly reliable and safe electrical supply is non-negotiable.The ALSTOM MVAJ27L1FB0784Dprovides the robust switching and protection needed to ensure operational continuity for these essential services.
Related Products
ALSTOM MVAJ Series Breakers:Other breakers in the same series with different current or voltage ratings(e.g.,MVAJwith lower/higher amperage).
ALSTOM Protective Relays:such as the Dor Fseries relays,which send trip commands to the breaker.
ALSTOM Switchgear Cubicles:The metal-clad switchgear designed to house the MVAJ27L1FB0784D.
Vacuum Interrupter(VI)Cartridge:The replaceable vacuum interrupter module inside the breaker.
Spring Charging Motor:The motor that charges the operating mechanism springs.
Installation and Maintenance
Pre-installation preparation:Before installing the ALSTOM MVAJ27L1FB0784D,ensure the switchgear cell is clean,undamaged,and correctly aligned.Verify that the primary disconnects(fingers)and secondary disconnects on the breaker truck and in the cell are clean and in good condition.Check the breaker’s rating plate to confirm it matches the system requirements for voltage,current,and interrupting capacity.The control power supply must be verified to match the breaker’s specifications(e.g.,125VDC).
Maintenance recommendations:Regular maintenance is crucial.It includes inspecting the vacuum interrupters for integrity(typically verified by a high-potential withstand test).The spring-charging mechanism should be checked for proper operation and lubrication.Primary and secondary contacts should be inspected for wear or signs of overheating.The insulation levels should be verified.All maintenance must be performed with the breaker fully disconnected,grounded,and in the fully withdrawn and grounded position,following strict lockout/tagout(LOTO)procedures.
Product Guarantee
We guarantee that the ALSTOM MVAJ27L1FB0784Dis a genuine product,sourced to meet original manufacturer specifications for performance and safety in medium-voltage applications.Our technical support can provide guidance on installation and maintenance best practices.We are committed to supplying high-quality power distribution components that ensure the safety and reliability of electrical systems,backed by our dedication to customer success.
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