ST-LCR3

RDL ST-LCR3 - Logic Controlled Relay with Dual Alternate Pulse

The RDL ST-LCR3 is a logic-controlled relay module designed to generate momentary control pulses at both the activation and deactivation of a logic signal. It is ideal for AV installations requiring precise triggering of two separate pulses – one at signal start and one at signal end.

The module features two logic inputs: one activated by grounding (LOW), and the other by applying a voltage (HIGH). Both inputs accept control voltages from 3.3V to 24V DC. When the input becomes active, the START PULSE is triggered; when it becomes inactive, the END PULSE is triggered. Each pulse lasts approximately 250 ms and is available via both open-collector output and relay contacts.

Functionality

• Generates pulses at logic signal activation and deactivation
• Supports active-high and active-low logic inputs
• Accepts control voltages from 3.3V to 24V DC
• Pulse outputs via open-collector and relay contacts
• Controls indicators or other RDL modules
• 24V DC power - ground-referenced configuration

Features

• Inputs: 2 logic (LOW = ground, HIGH = 3.3-24V DC)
• Outputs: 2 x open-collector @ 25 mA (for indicators or slave LCRs)
• Relay contacts: 2 x SPST (single-pole)
• Pulse duration: ~250 ms
• Max switching power: 60W (220V DC, 125V AC, 2A)
• Operating temperature: 0°C to 55°C
• Power requirement: 24V DC @ 100 mA (ground-referenced)

The RDL ST-LCR3 is a precise and flexible solution for AV integrators needing reliable pulse generation in response to logic signal transitions.