Earth Leakage Relay

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NX302A
301A
NX 301E 301E Features
•• Trip starting indicator

•• Detection of no connection to current

transformer for extra safety

•• Relay tripped indicator

NX 301A •• High immunity to electrical interference

Features for NX 302A only

•• Safety output contact

•• Earth leakage level indicators

•• Remote reset and remote test functions

NX 302A

Technical Data
AUXILIARY SUPPLY OUTPUT CONTACTS ZERO - PHASE CURRENT TRANSFORMER
Model NX301A / 302A -240A : 198 ~ 265 V AC Contact arrangement : 1 x manual reset type To operate with Mikro’s ZCT series of current
Model NX301A / 301E -110A : 94 ~ 127 V AC : 1 x safety contact* transformer
Rated frequency : 50 / 60 Hz : NC and NO contacts
VA rating : 3 VA typical available
Rated voltage : 250 V AC ENVIRONMENTAL CONDITIONS
Contact rating :5A Temperature : -10°C to 55°C
Expected electrical life : 100,000 operations Humidity : 5% to 95%,
NX 302A / 301A / 301E

SETTING RANGES at rated current non-condensing

Sensitivity adjustment : 0.03 A to 30 A Expected mechanical life : 5 x 106 operations
Delay time adjustment : 0 sec to 3.0 sec
MECHANICAL
INPUTS Mounting : Panel mounting
Remote Test* / Reset Inputs*: N.O. dry contact Dimension (mm) : 96(w) x 96(h) x 90(d)
PERFORMANCE Approximate weight : 0.4 kg (excluding ZCT)
Setting accuracy : -15% to +0%
Timing accuracy : ±5% INDICATORS
Auxiliary supply : Green indicator
Time delay : Red indicator * Applicable to NX302A series only
Trip : Red indicator ** Applicable to NX301E series only
Real-time leakage current : Red indicator
Earth Leakage Relay

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Typical Application Diagram Case Dimensions

96 mm

96 mm
Front

90 mm
NX 301A or NX302A 70 mm

Side

91.0 ± 0.5 mm

91.0 ± 0.5 mm
Panel Cutout
NX 302A

NX 301E
NX 302A / 301A / 301E

Ordering Information
MODEL DESCRIPTION
NX301A - 240A For 50 Hz system, auxiliary voltage 198 ~ 265 V AC
NX301A - 110A For 50 Hz system, auxiliary voltage 94 ~ 127 V AC
NX302A - 240A For 50 Hz system, auxiliary voltage 198 ~ 265 V AC
NX302A -110A For 50 Hz system, auxiliary voltage 94 ~ 127 V AC
NX301E - 240A For 50 Hz system, auxiliary voltage 198 ~ 265 V AC
NX301E -110A For 50 Hz system, auxiliary voltage 94 ~ 127 V AC
NX301A - 240A6 For 60 Hz system, auxiliary voltage 198 ~ 265 V AC
NX301A - 110A6 For 60 Hz system, auxiliary voltage 94 ~ 127 V AC
NX302A - 240A6 For 60 Hz system, auxiliary voltage 198 ~ 265 V AC
NX302A -110A6 For 60 Hz system, auxiliary voltage 94 ~ 127 V AC
NX301E - 240A6 For 60 Hz system, auxiliary voltage 198 ~ 265 V AC
NX301E -110A6 For 60 Hz system, auxiliary voltage 94 ~ 127 V AC