ABB DSSR122 (48990001-NK) – Solid-state relay output module for ABB Bailey INFI 90/Harmony systems

The ABB DSSR122, part number 48990001-NK, is a field-proven output module used in ABB Bailey INFI 90/Harmony DCS racks to switch discrete loads with solid-state reliability. From my experience, plants bring this module in when they need clean, fast, and low-maintenance switching for interposing relays, solenoids, lamps, and permissive circuits—without the chatter or wear you typically get from mechanical contacts. You might notice that it slots straight into the standard Harmony/INFI 90 chassis and ties into existing terminal units, which makes upgrades or replacements quick during a planned stop.

Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Solid-state switching – Typically delivers fast, bounce-free switching and long service life compared to mechanical relays.
• Backplane integration – Plugs into ABB Bailey INFI 90/Harmony racks, keeping wiring layouts and maintenance routines familiar.
• Isolation and noise immunity – Designed for industrial environments where electrical noise and ground differences are common.
• Status indication – Front LED indications (per channel or per group, depending on revision) help with quick diagnostics in the cabinet.
• Low maintenance footprint – No moving contacts; typically reduces contact wear, sparking, and the need for frequent replacements.
• Deterministic response – Stable on/off behavior supports permissive logic, trip circuits, and interlocks.
• Field-friendly – Works with standard terminal units and wiring kits used across Bailey/Harmony racks.

Technical Specifications

Application Fields

You’ll typically find the DSSR122 in plants that prefer silent, fast, and durable switching for discrete loads:

• Power generation – turbine auxiliaries, breaker permissives, trip logic
• Oil & gas – ESD loops, valve actuation, burner management I/O interfaces
• Chemicals & petrochemicals – interlocks, alarms, and motor control signaling
• Metals & mining – conveyor interlocks, lamp stacks, solenoid control
• Water & wastewater – pump station permissives, panel indications

Advantages & Value

• Reliability – Solid-state outputs typically improve uptime and reduce nuisance failures from contact wear.
• Compatibility – Designed for ABB Bailey INFI 90/Harmony racks, so retrofits are straightforward and low risk.
• Maintenance savings – Fewer mechanical parts to service; quicker diagnostics via front LEDs.
• Lifecycle support – We help with cross-references, firmware notes (if applicable), and wiring kit selections to keep your cabinet standard.

Installation & Maintenance

• Cabinet environment – Install in a clean, ventilated, and dry control cabinet. Keep ambient within the typical 0…55 °C range and avoid vibration where possible.
• Wiring – Use the matching ABB terminal unit/wiring kit for the slot. Separate field power and signal cables; observe polarity on DC loads.
• ESD & handling – Treat the module as an ESD-sensitive device; insert and extract using approved procedures with the rack powered as per site practice.
• Protection – Provide external fusing for field supplies and follow site standards for grounding and shielding.
• Routine checks – Visual check of status LEDs and terminal torque; clean dust with dry air; review firmware or revision notes if your site tracks module revisions.

Quality & Certifications

• Manufactured under ISO 9001 quality systems (ABB production)
• Typically CE-marked for industrial EMC and safety
• UL/CSA considerations may apply at the system level when installed in listed panels
• RoHS compliance can vary by vintage; many units supplied today meet current RoHS requirements
• Standard warranty: 365 days

Supporting Components You May Need

• ABB Bailey rack/chassis slot for INFI 90/Harmony
• Matching terminal unit/wiring kit for DSSR-series outputs
• Backplane power supplies appropriate for your rack population
• Shielded cable sets and labeled ferrules for field terminations

Customer note: “We swapped a mechanical DO card for DSSR122 during a boiler outage. The faster switching and zero contact wear solved our lamp failures—we haven’t touched that loop since.” This seems to be the typical feedback we hear after moving to solid-state outputs.