Why do I need transistor in the following mains power failure circuit

Automatic Mains Failure Solution Circuit Diagram

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Automatic Mains Failure Control Panel - Suraj Enterprises, Meerut | ID

Power supply failure alarm

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Automatic Mains Failure (AMF) | Electrical Systems
Automatic Mains Failure (AMF) | Electrical Systems

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Why do I need transistor in the following mains power failure circuit
Why do I need transistor in the following mains power failure circuit

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Wiring Diagram For Emergency Generator
Wiring Diagram For Emergency Generator

Why do i need transistor in the following mains power failure circuit

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Mains Failure Alarm - EEWeb
Mains Failure Alarm - EEWeb

Mains Power Supply Failure Alarm Circuit Design
Mains Power Supply Failure Alarm Circuit Design

The Automatic Mains Failure Panel - CR4 Discussion Thread
The Automatic Mains Failure Panel - CR4 Discussion Thread

12 [pdf] CIRCUIT DIAGRAM FOR AUTOMATIC MAINS FAILURE PANEL PRINTABLE HD
12 [pdf] CIRCUIT DIAGRAM FOR AUTOMATIC MAINS FAILURE PANEL PRINTABLE HD

Automatic Mains Failure Control Panel - Suraj Enterprises, Meerut | ID
Automatic Mains Failure Control Panel - Suraj Enterprises, Meerut | ID

ac - Mains failure detection circuit - Electrical Engineering Stack
ac - Mains failure detection circuit - Electrical Engineering Stack

Mains Failure - Resumption Alarm Circuit Diagram | Electronic Circuits
Mains Failure - Resumption Alarm Circuit Diagram | Electronic Circuits

Power Supply Failure Alarm - Schematic Design
Power Supply Failure Alarm - Schematic Design

Automatic Mains Failure Panel - Manufacturer Exporter Supplier in
Automatic Mains Failure Panel - Manufacturer Exporter Supplier in