Description

ABB DRA02 Relay Output Module Product Description

Technical Specifications

• Product Model: DRA02
• Brand: ABB
• Warranty: One Year
• Input Voltage: 24 VDC supplied via DCS rack backplane
• Operating Temperature: 0°C to +55°C
• Storage Temperature: -40°C to +70°C
• Response Time: ≤10 ms relay actuation response
• Protection Class: IP20 (cabinet eurocard rack‑mount installation)
• Accuracy Class: Industrial relay switching grade
• Output Frequency: Not applicable
• Rated Current Range: 2 A per‑channel relay contact rating
• Communication Interface: S100 backplane bus, field relay terminal block
• Supported Protocols: ABB proprietary S100 parallel backplane bus protocol
• Overload Capacity: Contact surge suppression, channel‑wise overcurrent protection
• Dimensions: 234 mm × 324 mm × 22.5 mm

Product Overview

The ABB DRA02 is eurocard‑format relay output module designed for ABB Advant AC400 DCS systems, delivering dry‑contact relay switching outputs for motor starters, solenoid valves and auxiliary field devices. This automation component converts digital control commands from the DCS controller into mechanical relay contact states for on‑off field equipment control. It solves common legacy system issues including insufficient contact capacity and lack of electrical isolation between control system and high‑power field circuits. Facilities maintaining ageing ABB control hardware utilise this spare part to preserve discrete‑loop control performance and avoid large‑scale system upgrades. Maintenance technicians, automation engineers and system integrators in power generation, chemical and pulp‑and‑paper industries depend on this module for reliable on‑site switching operations. (Word count:166)

Key Functions

Isolated Dry‑Contact Relay Switching This module provides galvanically isolated relay contacts to switch external field circuits. Each channel operates independently to drive solenoids, alarm relays and motor auxiliary circuits. Isolation separates DCS control electronics from field power circuits to minimise damage risk to core controller hardware.

Per‑Channel Surge Suppression for Inductive Loads Integrated suppression components absorb voltage spikes generated by inductive field loads. This feature extends relay service life and reduces electrical noise fed back into the control cabinet. It lowers premature contact wear caused by frequent switching of coils and solenoid devices.