Instrumentation India - Finetech Enginnering Corporation

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Motor Protection Devices (Energy Saving Equipments)

Micro Computer Motor Protection Device

µLCDX

µLEDX

Over Load Range:	Features:	Protection:
0.8 to 25A 2 to 62.5A 4 to 125A 8 to 250A 16 to 500A	In built Hour Counter which records Motor Running Hours Monitors Three Phase Current CT Specially designed for Motor Protection Earth leakage Scanner S/D Timer* LCDX displayed Three Current, Three Line Voltages in 16X2 LCD Backlit Display	Over Load Under Current Short Circuit Earth Fault Single Phasing Over Temperature* Unbalanced Locked Rotor Phase Reversal*

Fault Annunciations
µLCDX	µLEDX
Over Load Under current Earth Leakage High Voltage Unbalanced Single Phasing Locked Rotor Low Voltage Short Circuit	Over Load Under current Locked Rotor Short Circuit Earth Leakage Single Phasing Unbalanced Over Temperature Phase Reversal

Display type : LED Seven Segment, 4 Digit
Size : Panel mountable - 96X96X65 (LEDX)
96X96X85 (LCDX)

Motor Protection Device - µMPD1

Over Load Range:	Features:	Protection :	Fault Annunciations :
0.8 to 25A 2 to 62.5A 4 to 125A	In built Hour Counter which records Motor Running Hours CT Specially designed for Motor Protection Monitors Three Phase Current	Over Load Under current Unbalanced Locked Rotor Single Phasing Earth Leakage*	Over Load Under current Unbalanced Locked Rotor Single Phasing Earth Leakage*

Display Type : LED Seven Segment, 4 Digit
Size : Panel mountable - 96X96X65
Note : All Dimensions are in mm.
* Optional

Micro Computer Without Display Motor Protection Device

Over Load Range :	Features :	Protection :	Optional :
1 to 5A 1 to 20A 5 to 20A 2 to 40A	LED Fault Annunciations In Built CT's CT Specially designed for Motor Protection	Over Load Under current Single Phasing Unbalanced	Thermistor Relay Star - Delta Pause timer Earth Fault Relay Definite Tripping

DIN Rail type Mounting
Size : 75X45X115

Cyclic Load Energy Saver

When the load on the motor is less than 50%, the Motor operates in star mode to save energy, at a High power factor and lower maximum demand. The change over is automatic. The saving are around 40% at very low loads and around 10% at 40-50% load. The payback period is usually less than 12 months.

Over Load Range :	Features :	Protection :	Optional :
2 to 62.5A 4 to 125A	Automatic Delta-Star Converter with Motor Protection Device Monitors Three Phase Current	Over Load Unbalanced Single Phasing	Definite Tripping Star - Delta Pause Timer

Display Type : LED Seven Segment, 4 Digit
Size : Panel Mountable - 96X96X110

I - T characteristic

Full Protection against Overload is offered as per inverse time current characteristic that is higher the current smaller the time to trip thermal endurance limits of motor winding insulation.

Optional :
IDMT Overload & Earth fault is available.

Why Micro Computer Electronic Relay are Preferred?

It is Established fact that Thermal BI-METAL Relays can not Detect over loaded conditions much above 10%
That such device lose their accuracy with time due to their electro-mechanical wear. (They need to be replaced every 1 to 2 year if any token of accurate protection is required.)
That devices do not accurately reflect the heat build up in a motor and that when they in like manner do not reflect an accurate required cooling period before the motor may be safely re-started.
Such device will trip on a phase loss condition unless the motor happens to be running close to full load.
As thermal over load relay operates on thermal principal, it consumes costly energy about 60W of each relay.
20% motor burn out are due to faulty, spurious unmatched overload relay including its heating element failure.
The breakdown analysis of the motor failure reveals that 50% are due to single phasing & 50% due to bearing failure, jamming & locked rotor condition which clearly established the fact that thermal over load relays does not provide protection at all against bearing failure & single phasing.
Due to repeated failure of motor owing to bearing failure, the bearing housing becomes loose motor shaft worn out, which add to imperfection of rotating part inviting further breakdown, increased no load losses, added frictional loss, energy loss & next breakdown.

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