Description
Product Overview
DIN rail mount discrete output interface module designed to convert low-voltage PLC logic control signals into high-current switching drive for field actuators, solenoid valves, indicator lamps, and auxiliary contactors. OUT-3A is the base non-amplified relay variant of the GESOUT-3 platform family.
Technical Specifications
- Digital Output Channel Count: 3 fully galvanically isolated independent channels
- Relay Contact Type: Single-pole Form C (changeover NO/NC common terminal)
- Single Channel Resistive Switching Rating: 5 A @ 250 VAC / 5 A @ 30 VDC
- Single Channel Inductive Switching Rating: 3 A @ 250 VAC / 2 A @ 30 VDC
- Logic Side Supply Voltage: 24 VDC nominal, operating range 18–35 VDC
- Logic Current Consumption: 85 mA maximum full-channel energization
- Isolation Voltage (Logic ↔ Field Side): 2500 VAC reinforced isolation
- Operating Temperature Range: -40 °C to +70 °C
- Storage Temperature Range: -40 °C to +85 °C
- Physical Dimension (W×H×D): 233 mm × 167 mm × 20 mm (3U standard industrial PCB form factor)
- PCB Substrate Thickness: 2.0 mm FR4 flame-retardant grade
Material Composition
- Main Circuit Board: FR4 UL94-V0 halogen-free fire-resistant laminate
- Relay Switch Contacts: Silver tin alloy anti-arc plating
- Module Housing: Black polycarbonate impact-resistant enclosure
- Terminals: Tin-plated copper screw terminal blocks with stainless steel fastening screws
- Internal Bus Connector: Gold-plated phosphor bronze contact pins
Structural Characteristics
- Standard 3U Eurocard PCB footprint compatible with GESPAC GE-series rack backplanes
- Front-panel visual LED status indicator for each individual output channel
- Removable screw terminal blocks for rapid field wiring disconnection without module removal
- Dual mounting compatibility: standard 35 mm EN60715 DIN rail or direct cabinet panel bolt mounting
- Internal reinforced isolation barrier separating logic low-voltage zone and field high-power switching zone
Working Principle
Low-voltage digital logic signals transmitted via the GESPAC system backplane trigger optocoupler galvanic isolation stages, which drive internal miniature electromagnetic relays. Each relay’s Form C contact provides separate normally open and normally closed switching paths to independently control external field devices. Reinforced isolation eliminates ground loop interference and protects upstream PLC CPU hardware from voltage surges generated by inductive field loads.
Function & Feature Highlights
- Three independent fully isolated switching channels eliminating cross-channel electrical interference
- Front-facing LED channel status indicators for rapid on-site troubleshooting
- Hot-pluggable rack insertion compatible with live 24 VDC logic bus power
- Built-in freewheeling flyback suppression diodes for inductive load transient voltage absorption
- Wide DC logic input voltage tolerance for unstable industrial cabinet power supplies
- Vibration and shock certified to IEC 60068 industrial environmental standards
Core Advantages
- Reinforced 2500 VAC isolation prevents damage to central control hardware from field-side short-circuit faults
- Dual DIN rail/panel mounting flexible integration into new and legacy automation cabinets
- Wide operating temperature range supports outdoor unheated industrial control enclosures
- High anti-vibration mechanical construction certified for packaging, printing, and heavy machinery production lines
- Direct mechanical and electrical interchangeability with all GESOUT-3 platform variants (OUT-3A/OUT-3B)
Applicable Industries
Factory discrete manufacturing automation, packaging machinery control systems, water/wastewater process control, printing press motion control, elevator auxiliary safety circuits, material conveying equipment, HVAC industrial ventilation control
Installation Requirements
- DIN rail mounting requires horizontal module orientation; vertical mounting degrades heat dissipation and reduces relay service life
- Minimum 15 mm vertical spacing between adjacent modules to maintain natural convection cooling airflow
- Field wiring must separate low-voltage logic cables and high-power load wiring into distinct cable trunking channels
- Torque specification for screw terminals: 0.6 N·m to avoid terminal loosening under continuous vibration
- Rack backplane bus connector must fully seat with audible click to eliminate intermittent logic signal faults
Usage Precautions
- Do not exceed rated switching current for inductive loads; overcurrent operation causes permanent relay contact arc erosion
- All external inductive actuators (solenoids, contactor coils) require parallel transient suppression components for long-term module reliability
- Operating environment relative humidity must stay below 95% non-condensing; condensation creates tracking leakage across isolation barriers
- Avoid installation within 30 cm of high-power variable frequency drives to minimize electromagnetic noise interference
- Annual visual inspection of relay contacts mandatory for high-cycle switching applications (over 10,000 daily actuation cycles)
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