24V 30A Speaker Protection board for Audio Power Amplifiers

Speaker Protection Relay Board (30 A)

This board is designed to provide speaker protection by controlling output connection through a relay based on input conditions.

Working Voltage:

• Input supply: 0 to 24 V AC (step-down transformer or auxiliary AC source)

Current Capacity:

• Maximum switching current: up to 30 A (depends on relay rating and load conditions)
• Relay type: L90 / H90 T-type relay

Features:

• Turn-on delay: approximately 1 to 2 seconds to prevent speaker damage from power-on/off transients
• DC detection: relay disconnects speakers when DC voltage of approximately 2 V or higher is detected at the input
• LED indicators: red and green LEDs for status indication and fault detection

Board Specifications:

• PCB dimensions: 75 mm × 55 mm

Configuration:

• Designed to be connected between amplifier output and speaker load
• Requires proper wiring and compatible relay supply for correct operation

Intended Use:

• Speaker protection in audio amplifier systems
• Prevention of speaker damage due to DC offset or power-on/off transients
• Suitable for home audio systems, subwoofer amplifiers, and DIY audio projects