ABB DO828 125V DC Relay Output for 800xA Systems
Manufacturer: ABB
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Part Number: DO828 3BSE069055R1
Condition：New with Original Package
Product Type: Relay Output Modules
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The ABB DO828 (3BSE069055R1) serves as a high-density relay interface for the ABB S800 I/O system, providing 16 independent output channels for switching high-voltage loads. This 100% brand new, original module supports a broad operating range up to 250V AC or 125V DC with a continuous current capacity of 2A per channel. Unlike standard group-isolated modules, the DO828 features full channel-to-channel galvanic isolation, making it the primary choice for complex power distribution and interlocking tasks in System 800xA and Symphony Plus control architectures.
Technical Specifications
The DO828 integrates robust mechanical relays with optical isolation barriers to ensure deterministic switching performance and backplane protection.
| Attribute | Technical Detail |
| Model Number | DO828 |
| Part Number | 3BSE069055R1 |
| Number of Channels | 16 Channels (Relay Output) |
| Max Output Voltage | 250 V AC / 125 V DC |
| Max Continuous Current | 2 A |
| Isolation Architecture | Individually Isolated (Channel-to-Channel & Common) |
| Rated Insulation Voltage | 250 V |
| Dielectric Test Voltage | 2000 V AC |
| Power Dissipation | 3.5 W (Typical) |
| Status Indicators | F(ault), R(un), W(arning), Individual Channel LEDs |
| Dimensions (HxWxD) | 11.9 cm x 4.5 cm x 10.2 cm |
| Weight | 0.31 kg |
Engineering Advantages
The ABB DO828 3BSE069055R1 resolves sophisticated electrical isolation and voltage-switching challenges in industrial environments:
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Individual Channel Isolation: Each output channel operates through an independent optical isolation barrier. This architecture prevents a single-channel failure or electrical surge from migrating to adjacent channels or the central ModuleBus, ensuring maximum system availability for critical interlocking logic.
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High-Voltage Switching Versatility: The module handles both 125V DC and 250V AC loads directly. This flexibility allows engineers to drive diverse field equipment—such as motor starters, large solenoids, and high-wattage signaling lamps—without requiring secondary interposing relays or additional cabinet space.
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Active Voltage Supervision: The DO828 monitors the 12V relay supply voltage derived from the ModuleBus. If the supply voltage disappears, the unit triggers a Warning LED and sends an error signal to the controller. This feature allows maintenance teams to detect power issues immediately before they result in process failures.
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Integrated EMC Protection: Every channel includes dedicated EMC protection components and a relay driver circuit. These components suppress electromagnetic noise generated during relay switching, preventing interference with sensitive analog instrumentation nearby and extending the life of the relay contacts.
FAQs
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Can I disable the relay supply voltage supervision?
Yes. The supervision function is parameter-driven. You can enable or disable this feature through the system configuration software (e.g., Control Builder M) based on your specific application requirements.
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Does the DO828 require a specific Module Termination Unit (MTU)?
The DO828 integrates with the standard S800 I/O termination units. Ensure the selected MTU supports the high-voltage ratings (250V) required by the DO828 to maintain compliance with safety and insulation standards.
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What happens if a single relay fails?
Because all 16 channels are individually isolated, a mechanical or electrical failure in one relay will not compromise the operation of the other 15 channels. The module's Fault (F) LED will indicate a hardware anomaly, which you can further diagnose through the DCS alarm logs.
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Is this module suitable for safety-related interlocks?
While the DO828 provides high isolation (2000V AC dielectric test), users should consult the Safety Manual for the S800 I/O system to determine if it meets the specific SIL (Safety Integrity Level) requirements for their safety instrumented system (SIS) applications.