ABB Safety Relay Module - NC Output for S800 I/O - DO821

DO821 Relay Module: 8-Channel Safety Control for Industrial Systems

• Ready to ship today via FedEx, UPS, or DHL
• 12-month product warranty for peace of mind
• Expert technical support included with your purchase

Product Overview

The DO821 module delivers 8 safety relay outputs for your S800 I/O system. This module handles 230V AC/DC power with 3A maximum current. Perfect for critical shutdown systems and safety applications.

Key Features

Normally Closed relay contacts for safety-first design

Individual channel isolation for maximum protection

Output Status Protection (OSP) for error handling

Visual status indicators for easy monitoring

ModuleBus communication for system integration

Technical Specifications

Brand: ABB

Model: DO821 | 3BSE013250R1

Output Type: 8-Channel Relay (NC)

Voltage Range: 5-250V AC/DC

Current Rating: 3A per channel

Isolation: 2000V AC dielectric test

Power Use: Typical 2.9W

Operating Temp: 0°C to +55°C

Wire Distance: 600 meters maximum

Module Width: 45mm compact design

Weight: 0.23kg lightweight

Compatible Mounting Units

Use with TU811, TU813, TU831, TU836, TU837, TU851

Keying Code: CA required

Safety & Certifications

CE Certified for European market

UL Safety Standards compliant

RoHS & WEEE environmental standards

IP20 Protection against dust and touch

Shipping & Support

Fast Worldwide Shipping: FedEx, UPS, DHL

12-Month Warranty on all components

Frequently Asked Questions

What does Normally Closed (NC) mean?

The circuit is complete when de-energized. It opens when activated. This failsafe design is ideal for safety applications.

How does the OSP feature work?

Output Status Protection sets relays to a safe state if system errors are detected, preventing unexpected operation.

What is the maximum wire size?

Use 0.05-2.5mm² solid or 0.05-1.5mm² stranded wire. Strip 6-7mm of insulation for proper connection.

Can I mix AC and DC voltages?

Yes, the DO821 handles both AC and DC signals from 5V to 250V on the same module.

What happens during power loss?

The module detects power issues and triggers warning LEDs. The error status can be read through ModuleBus communication.