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ABB DSTD108 Connection Unit  

1. Key Parameters

• Product Model: DSTD108
• Order Code Reference: Typically paired with ABB automation wiring kits (e.g., 3ASD573004A9) for procurement consistency
• Product Series: ABB Industrial Wiring Termination & Signal Distribution Connection Units
• Core Function: Provides centralized terminal termination for ABB controller-field device wiring; distributes 24V DC control power to peripherals; filters low-frequency electrical noise from signal lines; enables easy wiring tracing and maintenance
• Terminal Specifications:

  Terminal Type	Number of Terminals	Wire Gauge Range	Rated Current/Voltage	Connection Method	Key Function
  Power Terminals	6 (3 input, 3 output)	0.5mm² ~ 2.5mm² (20AWG ~ 14AWG)	8A / 250V AC/DC	Screw-clamp (M3 screws)	Distributes 24V DC control power to sensors/actuators
  Signal Terminals	18 (9 input, 9 output)	0.14mm² ~ 1.0mm² (26AWG ~ 18AWG)	2A / 60V DC	Screw-clamp (M2.5 screws)	Transmits analog/digital signals (4~20mA, 24V DC) between controllers and field devices
  Ground Terminals	3	1.0mm² ~ 2.5mm² (18AWG ~ 14AWG)	-	Screw-clamp (M3 screws)	Provides protective earth (PE) for grounded devices and noise shielding

• Electrical Performance:
  • Signal Filtering: Integrated RC low-pass filters (cutoff frequency: 500Hz) for analog signal terminals; suppresses 50/60Hz grid noise and electromagnetic interference (EMI)
  • Isolation: 1kVrms (between power terminals and signal terminals; prevents ground loops and cross-talk)
  • EMC Immunity: Compliant with IEC 61000-6-2 (industrial environment); ESD protection: ±8kV (contact), ±15kV (air)
• Mechanical Specifications:
  • Housing Type: Flame-retardant polyamide (UL94 V-0); DIN rail-mountable (35mm standard rail, TS 35/7.5 or TS 35/15)
  • Dimensions (W×H×D): 25mm × 100mm × 80mm (ultra-compact design for space-constrained control cabinets)
  • Mounting: DIN rail-mounted (snap-on installation; no additional tools required)
  • Weight: Approximately 180g
  • Labeling: Pre-printed terminal identifiers (e.g., "PWR IN 1", "SIG OUT 3", "GND") + blank writable labels for custom marking
  • Protection Rating: IP20 (front panel; protects against finger contact and small debris)
• Environmental Ratings:
  • Operating Temperature Range: -20℃~+60℃ (-4℉~140℉)
  • Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
  • Humidity Tolerance: ≤95% RH (non-condensing, 40℃; suitable for damp industrial settings)
  • Vibration Resistance: 10~500Hz, 1.5g acceleration (IEC 60068-2-6; no terminal loosening or housing damage)
  • Shock Resistance: 20g acceleration (11ms duration, IEC 60068-2-27; maintains structural integrity)
• Compliance Standards: IEC 60947-1 (low-voltage switchgear), EN 61000-6-2 (EMC immunity), UL 1059 (terminal blocks), CE, RoHS

2. Key Features

• ABB Ecosystem Compatibility: Optimized for ABB controllers (AC500 PLCs, 800xA DCS) and field devices—terminal ratings, spacing, and filtering match ABB’s automation system requirements, eliminating wiring mismatches (e.g., undersized terminals for high-current power lines) common with generic connection units.
• Ultra-Compact Design: 25mm width (narrower than most industrial connection units) maximizes space efficiency in dense control cabinets—ideal for small automation setups (e.g., compact machine control panels) or cabinets with multiple I/O modules.
• Centralized Wiring Organization: Combines power, signal, and ground terminals in a single unit—reduces wiring clutter, simplifies tracing of faulty connections (via pre-printed labels), and minimizes the risk of loose or misconnected wires (a leading cause of system downtime).
• Integrated Signal Filtering: RC low-pass filters on analog signal terminals reduce 50/60Hz grid noise and EMI from nearby motors/VFDs—ensures clean signal transmission for sensitive sensors (e.g., 4~20mA temperature transmitters), improving controller measurement accuracy.
• Rugged Industrial Build: UL94 V-0 flame-retardant housing prevents fire spread in case of electrical faults; 1.5g vibration resistance and -20℃~+60℃ temperature range withstand harsh industrial conditions (e.g., automotive assembly lines, cement plants).
• Flexible Wire Compatibility: Supports diverse wire gauges (0.14mm²~2.5mm²) for power, signal, and ground terminals—accommodates small-signal wires (e.g., 0.14mm² for sensor signals) and higher-current power wires (e.g., 2.5mm² for actuator power) without additional adapters.
• Easy Installation & Maintenance: Snap-on DIN rail mounting enables tool-free installation; pre-printed labels and accessible terminals simplify wiring and troubleshooting—reduces installation time by up to 25% compared to disorganized, unlabeled wiring.

3. Application Fields

• ABB PLC/DCS Wiring Termination: Primary application—centralized connection for compact automation systems:
  • Manufacturing Machine Control: Connects ABB AC500 PLCs to small-scale machine sensors (e.g., proximity switches for part detection) and actuators (e.g., 24V DC solenoid valves); compact design fits in tight machine control cabinets, while filtering ensures accurate sensor signals.
  • Process Control Panels: Terminates wiring between ABB 800xA DCS and field instruments (e.g., 4~20mA flow sensors for small pipelines) in chemical/petrochemical plants; isolation between power and signal terminals prevents ground loops from disrupting process data.
• Auxiliary Component Power Distribution: Supplies power to low-current peripherals:
  • Electronics Production: Distributes 24V DC power to SMT machine sensors (e.g., PCB position detectors) and indicator lights; ultra-compact design saves space in SMT equipment control cabinets, while labeled terminals simplify maintenance.
  • Food & Beverage Processing: Terminates wiring for hygiene-rated sensors (e.g., level sensors in small tanks) and small actuators (e.g., valve positioners); IP20 protection prevents food debris from entering terminals, complying with HACCP standards.
• Harsh-Environment Automation: Supports reliable wiring in challenging settings:
  • Automotive Sub-Assembly Lines: Withstands vibration from robotic arms and welding equipment; filtering reduces EMI from welding machines, ensuring accurate communication between ABB PLCs and part presence sensors—prevents production delays from misdetected parts.
  • Mining Auxiliary Systems: Connects ABB controllers to small ventilation fan sensors and pump actuators in underground mines; wide temperature range (-20℃~+60℃) adapts to varying underground conditions, while rugged terminals resist loosening from mine vibrations.
• Legacy System Upgrades & Retrofits: Modernizes wiring for small-scale ABB setups:
  • Factory Retrofits: Replaces disorganized wiring in legacy ABB ACS550 VFD control cabinets (small to medium power); centralized terminals and filtering improve signal reliability, extending the lifespan of older automation systems without full replacement.
  • Building Automation: Terminates wiring for ABB controllers and HVAC sensors (e.g., room temperature detectors) in commercial buildings; compact design fits in wall-mounted control panels, while flexible wire compatibility supports diverse sensor types.

The structure and details of the product：

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