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ABB DO802 8-channel 110 V DC/250 V AC relay (NO) output module
1. Product Description
The ABB DO802 is a robust 8-channel digital output module featuring normally open (NO) relay contacts, designed for industrial automation control systems requiring medium-to-high voltage load driving. It receives digital control signals from upper controllers (e.g., ABB AC 800M DCS) and activates its internal relays to output 110 V DC or 250 V AC signals, enabling control of on-site high-power executive components such as AC motors, high-voltage solenoid valves, and industrial heaters. With relay isolation, strong load-bearing capacity, and dual-voltage compatibility, the module ensures safe and reliable signal transmission between the controller and high-voltage field devices, suitable for harsh industrial environments with high voltage demands.
2. Detailed Parameters
3. Advantages & Features
- Dual-Voltage Relay Output: Supports 110 V DC and 250 V AC loads via NO relay contacts, eliminating the need for voltage conversion modules and adapting to mixed-voltage industrial sites.
- Independent Channel Relays: Each channel has a dedicated relay, avoiding cross-failure between channels and improving system fault isolation.
- High Isolation & Safety: 2500 V AC isolation between channels and backplane prevents high-voltage leakage from damaging the controller, ensuring operator and equipment safety.
- Strong Load Capacity: 5 A resistive / 3 A inductive load current rating meets the driving needs of high-power devices (e.g., AC motors, industrial heaters).
- Arc Suppression Design: Built-in arc suppression for relay contacts reduces contact wear, extending relay lifespan and ensuring stable long-term operation.
4. Application Fields
- Heavy Industry (Steel/Metallurgy): Controlling AC motor starters for rolling mills, high-voltage solenoid valves for cooling water systems, and electric heating elements for furnace temperature control.
- Power Generation: Driving 250 V AC contactors for auxiliary pumps, 110 V DC solenoid valves for steam valves, and industrial fans in power plant boiler rooms.
- Oil & Gas (Refining): Controlling high-voltage valves in crude oil pipelines, 250 V AC heaters for oil storage tanks, and 110 V DC emergency stop actuators.
- Municipal Engineering: Operating 250 V AC water pump contactors in water treatment plants, 110 V DC solenoid valves for sewage treatment aerators, and street lamp control relays.
5. Precautions
- Confirm the load type (resistive/inductive) and voltage before wiring; do not exceed the maximum load current (5 A resistive / 3 A inductive) to prevent relay contact burnout.
- For inductive loads (e.g., motors, solenoid valves), install surge suppressors (e.g., varistors) in parallel with the load to reduce voltage spikes and protect relay contacts.
- Avoid frequent on/off operations (more than 10 times per minute) for the same channel, as this may accelerate relay contact wear and shorten service life.
- When installing in high-temperature environments (above 60°C), ensure adequate ventilation around the module to prevent over-temperature protection from triggering unexpectedly.
- Regularly inspect relay contact status (via controller diagnostics or visual inspection if possible); replace the module promptly if contacts show signs of burning or poor contact.

The structure and details of the product:

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