ETH8020 - 20 Relays at 16A, 8 Analogue Inputs
Technical Documentation
Overview
The ETH8020 provides 20 volt free contact relay outputs with a current rating of up to 16Amp each and 8 analogue
inputs. The module is powered from a 12vdc supply which can be regulated or unregulated. The DC input jack is
2.1mm with positive core polarity, DC supplies are required to supply at least 1A at 12vdc. The relays are SPCO
(Single Pole Change Over) types. The normally open, normally closed and common pins are all available on the screw
terminals.The Relays on the ETH8020 can be controlled from the inputs on the ETH484 or another ETH8020. This
offers the opportunity to construct a system where an input can control an output anywhere on the earth provided both
locations are connected to the network/internet.
Operating temperature
-40C to +70C
LED indication
The ETH8020 provides a red LED mounted immediately next to each relay to indicate whether it is in a powered state
(LED on), there is also two LED's mounted in the Ethernet connector which will flash with Ethernet traffic. Finally
there is a green power LED next to the processor.
Relay power rating
If the contact load voltage and current of the relay are in the region enclosed by the solid and dotted lines in the figure
below, the relay can perform stable switching operation. If the relay is used at a voltage or current exceeding this
region, the life of the contacts may be significantly shortened.
load
type
Typical applications
Rating
Max DC load capacity
AC1
Non inductive or
slightly inductive loads
16A @ 250V AC
AC15
Control of
electromagnetic load
(>72VA)
3A @ 120V AC
1.5A @ 240V AC
AC3
Control of motor
750W
DC1
Non inductive or
slightly inductive loads
16A @ 24V DC
DC13
Control of
electromagnetic
loads
0.22A @ 120V DC
0.1A @ 250V DC
A full datasheet for the relays used on the ETH8020 is here:
HF115FD datasheet
© Devantech Ltd 02/07/19
ETH8020 Documentation
1/17
