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8521 SeaRAQ 8 Channel Isolated Relay Outputs
8521 SeaRAQ 8 Channel Isolated Relay Outputs

Part# 8521


SeaRAQ 8 Isolated Form A Relay Outputs

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SeaRAQ™ I/O expansion modules provide unprecedented expansion capabilities for Sealevel Relio R3 and Relio R4 industrial computers. The SeaRAQ 8521 expansion board adds 8 isolated relay outputs rated for 5-250 VAC and 5-30 VDC. The Form A relays each have a discrete common and support a maximum 4A current load. The SPST relays are normally open and close when energized.

To protect the host computer from harmful voltage spikes commonly found in industrial environments, the 8521 provides 1500 VAC isolation. For easy, reliable field wiring, the board uses removable, high-retention terminal block connectors.

Sealevel's SeaMAX software drivers and utilities make installation and operation easy using Microsoft Windows and Linux operating systems. Communicate using industry standard Modbus RTU protocol or use the Sealevel SeaMAX API software libraries from your application program.

Get a jumpstart on your digital I/O development with The Digital I/O Handbook that will provide helpful information that you will use again and again. Check out Chapter 1 for an overview of logic principles.
Call for Price No
Brand/Family SeaRAQ
Modbus Yes
Digital I/O Reed Relay Outputs
RoHS Compliant Yes
Number of Inputs/Outputs 8 Isolated Outputs
Output Isolation 1500 VAC RMS (Field-to-Logic)
Contact Voltage 5-250 VAC (50/60 Hz)
5-30 VDC
Contact Current 2 A Pilot Duty Maximum (per Output)
4 A Maximum, Resistive (per Group)
Field Wiring 16-30 AWG
Plate Connectors High-Retention, Removable Terminal Blocks
Operating Temperature 0 - +70C
Extended Temperature Call for Options
Storage Temperature -50 - +105C
Humidity Range 10 - 90% Relative Humidity, Non-Condensing
Dimensions PCB is 6.00" (L) x 4.35" (W)
  • • Digital expansion module with 8 Form A relay outputs, rated for 5-250 VAC and 5-30 VDC loads
  • • Each relay has a discrete common and supports a maximum current load of 4A
  • • 1500 VAC field-to-logic isolation
  • • Industry standard Modbus RTU interface
  • • Input power provided via backplane connector
  • • Field wiring is simplified via removable 3.5mm terminal blocks compatible with 16-30 AWG wire
  • • Includes 20-position, removable, high-retention Phoenix terminal blocks
  • • Sealevel SeaMAX software supports Microsoft Windows and Linux operating systems

The Digital I/O Handbook (*Free)
The Digital I/O Handbook (*Free)


The Digital I/O Handbook
The Digital I/O Handbook


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