SeaRAQ 16 Isolated Form A Relay Outputs

Part: 8520   Model: SeaRAQ-8520

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SeaRAQ™ I/O expansion modules provide unprecedented expansion capabilities for Sealevel Relio R3 and Relio R4 industrial computers. The SeaRAQ 8520 expansion board adds 16 isolated relay outputs rated for 5-250 VAC and 5-30 VDC. The Form A relays are organized into four banks of four relays, with each bank sharing a common. The relays support a maximum current load of 2A per relay (4A maximum per bank). 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 8520 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 jump start 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.


Additional information



Contact Current

2 A Pilot Duty Maximum (per Output)4 A Maximum, Resistive (per Group)

Contact Voltage

5-250 VAC (50/60 Hz)5-30 VDC

Digital I/O

Form A Relay Outputs


PCB is 6.00" (L) x 4.35" (W)

Extended Temperature

Call for Options

Field Wiring

16 – 30 AWG

Humidity Range

10 – 90% Relative Humidity, Non-Condensing


Modbus RTU

Number of Inputs/Outputs

16 Isolated Outputs

Operating Temperature

0°C to 70°C (32°F to 158°F)

Output Isolation

1500 VAC RMS (Field-to-Logic)

Plate Connectors

High-Retention, Removable Terminal Blocks

RoHS Compliant


Storage Temperature

-50°C to 105°C (-58°F to 221°F)

  • Digital expansion module with 16 Form A relay outputs, rated for 5-250 VAC and 5-30 VDC loads
  • Relays are organized in four banks of four (4) relays, with each bank sharing a common
  • Relays support a maximum current load of 2A per relay (4A maximum per bank)
  • 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

Windows Software

Software: SeaMAX - Windows


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