Automatic amplifier changeover switch | with fault detection and remote control | 4-channel | F1AL fuse | manual and remote control

Technical specifications
Number of channels: 4
Channel operating load: 150 V / 30 A (audio signal)
Required amplifier gain: >20 dB
Input signal detection threshold: <100 mV
Channel detection / switching time: 20 ms
Power supply: AC 220 V / 50 Hz
Protection: F1AL fuse
Device dimensions: 484 × 320 × 88 mm (19″ rack format)
Net weight: 6.2 kg
Gross weight: 7.8 kg

Functions
Automatic monitoring of the main amplifier status
Instant switching to the backup amplifier in case of failure
4 identical, mutually independent channels
Manual selection of main / backup amplifier
Control via: computer (PC), network public address system (Network PA)
Ultra-fast fault detection – 20 ms
Designed for professional high-voltage audio lines

Applications
Home user / small business: Shopping centers, offices, hotels – ensures uninterrupted background music and information announcements; an invisible but critically important safety component
Electrical installers and safety system integrators: Clear and reliable PA system redundancy solution; suitable for both new projects and modernization of existing systems; reduces failure risk and maintenance costs
Engineer / system designer: Suitable for evacuation and emergency announcements; enables high-reliability (fail-safe) system design; easily integrated into centralized control infrastructures

Pros
Automatic switching without audio interruption
4 independent channels in one device
Ultra-fast response – 20 ms
High permissible voltage and current for professional PA systems
Manual and remote control
Robust industrial enclosure designed for continuous operation

Cons
Requires a separate backup amplifier
Designed for stationary installation (not a mobile solution)
Optimized for professional systems rather than small home audio installations