3BSE008514R1 DO820: DO820 relay outputs: contact load, isolation and field wiring checks
The ABB S800 DO820 digital output module, order code 3BSE008514R1, provides eight relay outputs. ABB catalog material describes individually isolated channels and switching for AC or DC circuits in the stated voltage range. DO820 is distinct from transistor-output modules: relay contact characteristics, load type and switching life must be included in the application review.
Key technical data
| Technical item | Verified value / selection note |
|---|---|
| ABB order code | 3BSE008514R1 |
| Module designation | DO820 |
| Output type | Relay output, normally open |
| Channel count | 8 individually galvanically isolated channels |
| Switching range | 24–230 V AC/DC family range |
| Output current | Up to 3 A per channel under stated load conditions |
| Termination | Approved MTU types include TU811/TU813/TU831/TU851; confirm exact compatibility |
Role in the control or protection system
DO820 can switch compatible actuator or interposing-relay circuits where potential isolation and the relay output form are appropriate. Review the load's inrush, inductance, operating frequency and required electrical life. For frequent switching or demanding inductive loads, confirm whether a contactor or suppression network is required instead of loading the output contact directly.
Selection and compatibility checks
For 3BSE008514R1, verify whether each load is AC or DC, the actual voltage and current, power factor or inductive duty, and the required MTU. Confirm output state on module fault, fuse strategy and separation of field potentials. Do not apply the DO820's nominal current limit without checking the load category and ABB's exact derating data.
For 3BSE008514R1 DO820, establish the equipment boundary before procurement: record the host controller or panel, the connected field device, the installed hardware and firmware revisions, the supply source, the protection method and the required operating sequence. A family-name match is not enough to confirm that 3BSE008514R1 DO820 is a compatible replacement. Check all interfaces and accessories against the exact ABB documentation.
Commissioning and acceptance
Isolate field supplies before removing or inserting the DO820 and identify each individually isolated channel. On commissioning, test commanded state and feedback independently, check for welded contacts or unexpected leakage, and validate the controller's fail-state logic. Record the field supply source and output-to-load mapping.
A practical acceptance record for 3BSE008514R1 DO820 should include the nameplate photograph, order code, terminal and connector condition, configuration or setting values, software revision where applicable, test equipment and measured results. If 3BSE008514R1 DO820 is installed as part of a larger system, record the system-level response as well as the local device indication.
Related same-series designations
These 3BSE008514R1 DO820 references identify related options or configurations, not automatic substitutes. Check each complete model code, ratings, connection method and compatibility before selection.
- 3BSE008514R1
- 3BSE008514R1DO820
- DO820
Procurement and maintenance handover
Retain 3BSE008514R1 DO820 as the exact reference in the asset register, replacement request and commissioning record.
Retain 3BSE008514R1 DO820 as the exact reference in the asset register, replacement request and commissioning record.
When requesting a quotation for 3BSE008514R1 DO820, provide the full designation, ABB order number, quantity, installed revision, application voltage, connected load or field-device type, required approvals and delivery destination. Ask the supplier to confirm that the supplied 3BSE008514R1 DO820 matches the stated hardware and accessory configuration. Do not substitute a neighboring family code without engineering review.
