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ATTENTION:
Please read this manual carefully before using Etna Electronic Thermal Relay
1. Product Details
ETNA Electronic Thermal Relay offers protection based on the programmed limits for current value
and switch number. It is a protection element with single pole and electronic current control, which
is exclusively designed for starting electric motors. It measures the drawn current with an internal
current transformer within the relay or an external current transformer within the panel used for high-
powered motors, and enables instant monitoring of the current with the integrated 7-segment LED
display. It notifies the operating and error status with LED lamps and dry contacts. The error history
can be monitored, the low and high current limits , the maximum number of switches allowed per
hour , the delay time based on low and high current limits can be adjusted, the low and high current
automatic reset programs can be enabled or disabled using the menu. The parameters can be set
easily using 'Up, Down' and 'Set' buttons.
Two versions of Etna electronic thermal relay are available.
1- ETR – DT
(Electronic thermal relay with internal current transformer): In this version, the current
transformer is included in the relay and it is designed to measure and provide protection in the
applications ranging from 0 to 25 Amperes.
2- ETR – HT
(Electronic thermal relay with external current transformer): This version is designed to
measure and provide protection in the high current applications ranging from 10 to 300 Amperes via
the current transformer externally placed in the panel.
Figure 1. ETNA Electronic Thermal Relay - External View
ETR – DT
ETR – HT
Error Warning Led
Set and Menu Button
Down Button
Up Button
On Warning Led
7 Segment Display
