Combined Overcurrent & Earth Fault Relay

www.itmikro.com

NX1000A
Features
• Microprocessor based numerical relay
• Current measurement based on fundamental
frequency
• Three-phase, low-set overcurrent
• Three-phase, high-set overcurrent
• Low-set earth-fault
• High-set earth-fault
•
•
• Local display of measured and set values
• Programmable relay outputs
•
•
• Complies with IEC 60255 standard
• ANSI Code : 50P, 50N, 51P, 51N

Technical Data
RATINGS SETTING RANGES INDICATORS
Rated current ( In ) :5 A I RCURRENT ELEMENT Auxiliary supply : Green indicator
Rated frequency : 50 or 60 Hz Low-set ( I> ) : 0.1 A to 10.0 A Pick-up : Red indicator
Burden : < 0.3 VA at In (2% to 200%) Trip : 7-segment display
Themal withstand : 4 x In : 0.01 to 1.0 and Red indicators
AUXILIARY SUPPLY : 0.00 sec to 100 sec
Model NX1000A-240A : 198 ~ 265 V AC High-set ( I>> ) : 0.5 A to 100 A
Model NX1000A-240AD : 85 ~ 265 V AC (10% to 2000%) ENVIRONMENTAL CONDITIONS
110 ~ 340 V DC or disable Temperature : -10˚C to +55˚C
Model MK1000A-150D : 24 ~ 150 V DC : 0.00 sec to 100 sec Humidity : 5% to 95%,
Supply frequency : 50 or 60 Hz non-condensing
: 3 VA typical
II EART FAULT ELEMENT
ACCURACY Low-set ( Io> ) : 0.10 A to 5.0 A,
: ± 5% (2% to 100%) MECHANICAL
Time delay : ± 5% with a o>) : 0.01 to 1.0 :
minimum of 50 ms o> ) : 0.00 sec to 100 sec Dimension (mm) : 96(w) x 96(h) x 110(d)
High-set ( Io>> ) : 0.10 A to 50 A : IP54 at the panel
OUTPUT CONTACTS (2% to 1000%) Approximate weight : 0.8 kg
Trip Contacts ( R1 & R2 ) or disable
Rated voltage : 250V AC / DC o>> ) : 0.00 sec to 100 sec
:5A
Expected electrical life (0.00 to 1.00, step 0.01; 1.00 to 10.0, step 0.10;
at rated current 10.0 to 100, step 0.5)
Expected mechanical life : 5 x 106
NX 1000A
Combined Overcurrent & Earth Fault Relay

www.itmikro.com

Normal Inverse Very Inverse Long Time Inverse Extremely Inverse

Normal Inverse 1.3/10 Typical Application Diagram Case Dimensions

96 mm
Front

110 mm
100 mm

Side

91.0 ± 0.5 mm

91.0 ± 0.5 mm

Panel Cutout

Ordering Information
MODEL DESCRIPTION
NX1000A-240A For 50/60 Hz system, auxiliary voltage 198 ~ 265 V AC
NX1000A-240AD For 50/60 Hz system, auxiliary voltage 85 ~ 265 V AC or 110~340 V DC
NX1000A-150D For 50/60Hz system, auxiliary voltage 24 ~ 150 V DC
NX 1000A