Description

ABB DSTD108P (3BSE018333R1) 8-Channel Relay Output Connection Unit

Technical Specifications

• Product Model: DSTD108P, Part No. 3BSE018333R1
• Brand: ABB
• Warranty: One Year
• Input Voltage: 24 VDC logic control power from S800 I/O backplane
• Operating Temperature: -20°C to +55°C
• Storage Temperature: -40°C to +85°C
• Response Time: ≤10ms relay contact pull-in switching delay per channel
• Protection Class: IP20 for cabinet DIN rail rack mounting
• Accuracy Class: Mechanical contact switching repeatability ±0.1ms timing tolerance
• Output Frequency: Maximum 1Hz continuous relay switching cycle for long service life
• Rated Current Range: Single channel max 0.2A resistive load, total module aggregate 3A maximum
• Communication Interface: ABB S800 I/O internal backplane bus, screw terminal field wiring block
• Supported Protocols: S800 IEC 61131-3 control bus, AC 800M controller proprietary communication
• Overload Capacity: Per-channel flyback diode surge absorption, overcurrent thermal protection, short-circuit blocking
• Dimensions: 211.5mm (L) × 121.5mm (W) × 58.5mm (H)

Product Overview

The DSTD108P is an 8-channel relay terminal connection unit belonging to ABB S800 I/O subsystem, matched exclusively with AC 800M PAC distributed control systems for process, power and factory automation plants. This terminal breakout board acts as the intermediate interface between S800 digital output base modules and field execution devices, converting low-power 24VDC logic drive signals into isolated mechanical relay contacts capable of switching wide-range AC/DC external loads up to 250V.

It solves typical limitations of transistor-type digital output modules in heavy industrial sites, including insufficient load capacity to drive AC solenoid valves, auxiliary contactors and audible alarm horns, lack of galvanic isolation between control cabinet low-voltage circuits and field high-voltage loops, difficulty in troubleshooting single-channel load short faults, and limited flexibility for mixed AC/DC field equipment wiring. Equipped with independent electromagnetic relays for each channel, built-in inductive load suppression circuits, front-mounted terminal blocks and channel status LED indicators, the unit maintains stable contact performance under cabinet temperature cycling, workshop vibration and electrical noise interference from high-power pumps, fans and compressors.

Process control I&C technicians, ABB AC800M system integrators, power plant DCS maintenance engineers and OEM panel builders obtain tangible operational value from this spare termination module. It realizes direct drop-in replacement within the S800 standard I/O rack without rack modification, electrically isolates field fault currents to avoid damaging the main DO electronic board, supports flexible wiring for both AC and DC field loads, and accelerates on-site fault location with individual channel visual status feedback during equipment overhaul.