The RDL ST-ACR1 is a compact, high-performance audio-controlled relay designed for automatic switching based on line-level audio signals. Part of the reliable STICK-ON® series, the ST-ACR1 is ideal for commercial AV systems, automation setups, paging applications, and equipment control where hands-free audio-activated switching is required.
The module features sensitivity and delay adjustments for precise triggering. The SENS control allows the unit to activate on audio levels between –30 dBu and 0 dBu, while the built-in threshold LED provides accurate visual calibration. The adjustable release delay (0.5 to 5 seconds) ensures smooth operation and prevents unwanted rapid cycling on fluctuating signals.
Equipped with DPDT relay contacts and an open-collector SLAVE output, the ST-ACR1 can control external devices, trigger additional relays, or integrate with automation systems. Its compact STICK-ON® format ensures fast, flexible installation in racks, under counters, behind equipment, or anywhere space is limited.
Key Features – RDL ST-ACR1
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Audio-controlled switching for line-level signals
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Adjustable sensitivity (–30 dBu to 0 dBu)
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Silence-sensing capability
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Adjustable release delay (0.5–5 seconds)
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DPDT relay contacts for versatile control
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Open-collector SLAVE output for cascading
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Compact STICK-ON® design for easy installation
