ABB DO821 is an S800 I/O digital output module identified by manufacturer article number 3BSE013250R1. ABB specifies eight individually isolated normally closed relay outputs for 5 to 250 V AC or DC circuits, with a maximum continuous output current of 3 A. Each channel includes an optical isolation barrier, relay driver, relay, output indication and EMC protection. Relay supply supervision is derived from the 24 V ModuleBus supply and can signal loss of voltage. Before replacement, verify the exact model, article number, termination unit, normally closed contact requirement, field voltage, load current and controller configuration. Stockoems commercial terms remain separate from ABB specifications.
Condition, availability and warranty are Stockoems commercial information, not ABB manufacturer commitments.
Receive relay output commands from the configured controller application.
Maintain individual optical isolation across all eight output channels.
Operate normally closed relay contacts within the documented ratings.
Switch validated AC or DC loads through the engineered S800 I/O station.
Verify the complete DO821 designation and 3BSE013250R1 article number, installed module termination unit, normally closed contact requirement, field voltage, load current, relay supply supervision and controller configuration before replacement. Confirm that the application requires NC contacts rather than normally open relay outputs. Similar S800 relay modules are not automatically interchangeable.
DO821 is an ABB S800 I/O relay output module with manufacturer article number 3BSE013250R1.
ABB specifies eight individually isolated relay output channels.
The official data identifies normally closed relay contacts for every channel.
ABB specifies 5 to 250 V AC or DC with a maximum continuous output current of 3 A.
Check the exact model and article number, termination unit, NC contact requirement, field voltage, load current and controller project.
Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
Email: sales6@apterpower.com | WhatsApp: +86 18159889985
Model and suffix verification
Product and label photo confirmation
Condition confirmation
Technical compatibility review
Protective packaging
Worldwide shipping
Shipment tracking
Customs documentation
Written warranty terms
Return authorization process
After-sales response
The workflow combines inspection planning, identity and label verification, technical compatibility review, protective handling, shipment coordination, tracking support, customs-file preparation and documented after-sales communication. Availability and delivery timing are provided only through written commercial communication; no unverified stock quantity or delivery promise is presented.
Choose a supplier that preserves the complete model, states condition clearly, requests label evidence and separates commercial terms from manufacturer specifications.
Request written model identity, article number, quantity, condition, warranty scope, packaging, shipping basis, customs documents and return rules.
Provide installed labels, termination-unit type, channel wiring, redundancy design, controller configuration, software revision and project backup.
Shortened model strings, copied data from similar modules, vague condition wording, unverifiable quantities, missing label evidence and absent return terms require caution.
Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
Email: sales6@apterpower.com | WhatsApp: +86 18159889985
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Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
Email: sales6@apterpower.com | WhatsApp: +86 18159889985
