RDL ST-ACR1 - Line-Level Audio Controlled Relay (0.5 to 5 Second Delay)

RDL ST-ACR1 - Line-Level Audio Controlled Relay (0.5 to 5 Second Delay)

RDL ST-ACR1 - Line-Level Audio Controlled Relay (0.5 to 5 Second Delay)

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RDL ST-ACR1 overview

  • 1Description

The RDL ST-ACR1 is an audio controlled relay and part of RDL's "Stick-On" series of equipment. It is designed for reliable operation and quick, easy installation. The ST-ACR1 is designed to switch line-level signals. Two multi-turn trimmers are provided, one for audio input sensitivity, and one for delay control.

The unit can be triggered from signals between -30 to 0 dBu, and an indicator LED allows accurate adjustments of the input sensitivity. The delay control sets the time delay for relay release when the audio drops below the pre-set threshold. The delay can be set from 0.5 to 5 seconds.

Small, compact unit can be easily mounted almost anywhere
Switching from line signals
Accepts balanced or unbalanced signals
Silence sensing
DPDT switching contacts
Open-collector slave output
UPC: 813721011152
In the Box
RDL ST-ACR1 - Line-Level Audio Controlled Relay (0.5 to 5 Second Delay)
  • 3 Year Limited Warranty
  • Table of Contents
    • 1Description

    RDL ST-ACR1 specs

    Audio Input 10 k ohms Balanced Bridging
    Input Connections Balanced or Unbalanced
    Control Output Open-Collector @ 50mA Suitable to Drive Indicators or Slave LCR Relay
    Indicators Audio Threshold LED for Setting Sensitivity
    Retrigger Delay 250 ms
    Contacts Double-Pole, Double-Throw
    Switching Power 60W, 125 VAC (Max)
    Switching Voltage 220 VDC, 250 VAC (Max)
    Switching Current 2 A (Max)
    Carrying Current 3 A (Max)
    Activation Response Time 25 ms
    Input Sensitivity -30 dBu to 0 dBu (Adjustable, Provides Switching at a -20dB Threshold for Signals of -10 dBu to +20 dBu)
    Relay Release Delay 0.5 to 5 seconds (Multi-Turn Adjustable)
    Power Requirements 24 to 33VDC @ 50mA (Ground-Referenced)
    Dimensions (HxWxD) 1.6 x 3 x 0.7" (41 x 76 x 18 mm)
    Packaging Info
    Package Weight 0.2 lb
    Box Dimensions (LxWxH) 4.1 x 2.1 x 1.9"

    RDL ST-ACR1 reviews

    ST-ACR1 - Line-Level Audio Controlled Relay (0.5 to 5 Second Delay) is rated 5.0 out of 5 by 3.
    Rated 5 out of 5 by from Ordering needed parts The ACRs we use are needed to prevent noise from being injected into the paging systems output when not needed. They control the proper output from our security voice output when it is needed. They work really well for that need. Can not think of anything bad about the units.
    Date published: 2015-07-09
    Rated 5 out of 5 by from Buy one if you need one! This unit performed as described. However, I needed one that had a much shorter delay so I returned it and promptly got a refund.
    Date published: 2017-08-08
    Rated 5 out of 5 by from Works well and versatile. I buy these fairly often for several different applications. They are tremendously reliable and allow low voltage control.
    Date published: 2017-09-10
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