Underload Relay EUCR

Products Name:	Underload Relay EUCR
Item No:	397631
Update time:	2005-7-2 18:52:00
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Underload Relay EUCR Description

Features
Compact Design
Multiple Protection Functions
Wide Current Adjustment Range (10:1)
Ammeter Function
Trip Indication LED
High Accuracy
Manual Instaneous Reset
Electrical Remote Reset
Test Function
Ambient Proof
Low Energy Consumption
Fail- Safe Operation(No Volt Release)

Over-current Protection
Over-current Protection is provided by tripping the relay when motor operating current (ln) exceeds over-current setting(Is) of EOCR for a period greater than the preset operating time (O-TIME).

Phase Loss Protection
During a phase loss, the motor winding current may increase by 150% or more. As the motor winding current increase, the winding temperature may also increase and possibly damage the winding insulation.
The quick trip time on EOCR helps to prevent over-current damage to the windings.

Ammeter Function & Trip Indication
Indication LED on the dial plate provides trip indication and ammeter functions.
The LED starts to flash at the point where motor current is equal to current setting level(ls), so user can verify motor current by reading the LOAD adjustment scale on the dial plate.
This also provides an accurate current setting. The LED is illuminated when motor current exceeds current setting(Overload Status).
After tripping has occurred, the LED stays on until the relay is reset. The trip indication is also an important feature of multiple relay & contactor (starter) installation.

Wide Adjustment Range.
EOCR has a wide current adjustment range of over 10:1. It enables three type models to cover a wide range from 0.1A up to 600A thus reducing the number and type of relays that must be inventoried for spare purposes.

Looping Option
Some motor capacity may require only one-third or one-forth of particular EOCR current range. These installations can be accommodated by looping the motor wire 2 or 3 times through the integral current transformers of the EOCR.
This reduces the number and type of relays inventoried for spare purposes. Each additional loop will increase the current measured as indicated by the following chart.

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