Description

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Product Title

ALSTOM MVAJ101RB0800A – Auxiliary / Tripping Protection Relay

Product Overview

The ALSTOM MVAJ101RB0800A is an electromechanical protection relay from the MVAJ series originally manufactured by Alstom (later supported by AREVA and now part of GE Grid Solutions). It is designed for tripping, control, and auxiliary protection functions in power system protection schemes, especially within substations and switchgear panels.

This relay operates as part of a protection system where it receives signals from protection relays (overcurrent, differential, feeder protection, etc.) and then activates trip coils or alarm circuits to isolate faulty equipment. It is commonly installed in medium- and high-voltage switchgear panels, providing reliable and fast switching action for protection circuits.

Technical Specifications (Typical for MVAJ101 series)

Product Model: MVAJ101RB0800A

Manufacturer: Alstom / AREVA

Device Type: Auxiliary / tripping protection relay

Operating Coil Voltage: Typically 110–125 V DC

Contact Configuration: Multiple changeover contacts

Reset Type: Automatic or self-reset depending on configuration

Application Category: Protection and control circuits in switchgear

Case Type: Draw-out protection relay case

Weight: ~1.5–1.7 kg typical for this relay family

Standards: IEC protection relay standards

Main Features and Benefits

Fast Tripping Operation ⚡
Designed for quick actuation to ensure circuit breakers trip immediately when a protection relay detects a fault.

Reliable Electromechanical Design 🔧
The MVAJ series uses a robust armature mechanism that provides dependable switching even in high-energy protection circuits.

Multiple Contacts for Control Logic
Several relay contacts allow simultaneous control of trip circuits, alarms, interlocks, and SCADA signals.

High Compatibility in Protection Systems
Commonly used with feeder protection, transformer protection, or generator protection relays in substations.

Proven Utility-Grade Equipment
The MVAJ family has been widely used in power plants, transmission substations, and industrial switchgear for decades.

Typical Applications

⚡ Substation protection panels

⚡ Medium-voltage and high-voltage switchgear

⚡ Circuit breaker tripping circuits

⚡ Protection scheme auxiliary relay logic

⚡ Alarm and interlocking circuits in power systems

✅ In simple terms:
The ALSTOM MVAJ101RB0800A is an auxiliary tripping relay used in electrical protection systems. When a protection relay detects a fault (like overcurrent or earth fault), this relay activates and sends the command to trip the circuit breaker and isolate the faulty equipment.

💡 If you want, I can also explain:

the meaning of the code MVAJ101RB0800A (each part of the model number), or

show a typical substation protection wiring diagram where this relay is used.