Crompton Instruments M3N1 Catalog Page

3-IN-1 CURRENT TRANSFORMERS

A range of 3-in-1 current transformers combine three traditional current
transformers in one moulded case. 3-in-1 current transformers can be directly
installed next to a three-phase moulded case circuit breaker, thus saving installation
time where fitting three standard individual current transformers would be required.
The M3N1 range of current transformers offers primary currents between 60-630A
with 5A secondaries with up to Class 0.5 accuracy performance.

Specifications

System voltage: 720V maximum
Test voltage: 3kV for 1 minute
System frequency: 50Hz or 60Hz
Primary ratings: 60A to 630A
Short circuit thermal current: 60 x rated primary current (lth): for 1 sec
Overload withstand: 1.2 x rated current continuously
Rated dynamic current: = 2.55 x Ith

Features

• Cost effective three-phase
moulded case

• Ratio’s ranging from 60/5
to 630/5

• Integrated wire sealable
terminal cover

• Busbar, DIN-rail and metal feet
mounting hardware supplied

• Combined M4 posi/slot screw

Benefits

• Isolated output for safety

• Faster installation

• Compact size

• Ex-stock delivery

Applications

• Switchgear

• Distribution systems

• Generator sets

• Control panels

Secondary terminals: M4 screw terminals
Enclosure: Flame retardant grade classified UL 94V-O
Aperture holes centres: 25, 35, 45mm
Operating temperature: -20°C to +85°C
Accuracy: Class 0.5, 1, 3
Mounting hardware: Plug-in metal feet for wall or base mounting

Busbar and DIN-rail mounting
Compliant with: IEC/EN60044-1

Part number Ratio

M3N1-25-60/5 60/5 - 1 2 3@14.5 x 24.5mm
M3N1-25-100/5 100/5 - 1.5 2.5 3@14.5 x 24.5mm
M3N1-25-125/5 125/5 - 1.5 2.5 3@14.5 x 24.5mm
M3N1-25-150/5 150/5 1.5 1.5 2.5 3@14.5 x 24.5mm
M3N1-25-160/5 160/5 1.5 1.5 2.5 3@14.5 x 24.5mm
M3N1-35-100/5 100/5 - 1.5 2 3@20.5 x 24.5mm
M3N1-35-125/5 125/5 - 1.5 2.5 3@20.5 x 24.5mm
M3N1-35-150/5 150/5 - 1.5 2.5 3@20.5 x 24.5mm
M3N1-35-160/5 160/5 1.5 1.5 2.5 3@20.5 x 24.5mm
M3N1-35-200/5 200/5 1.5 1.5 2.5 3@20.5 x 24.5mm
M3N1-35-250/5 250/5 1.5 1.5 2.5 3@20.5 x 24.5mm
M3N1-45-250/5 250/5 1.5 1.5 2.5 3@30.5 x 30.5mm
M3N1-45-300/5 300/5 2.5 2.5 3.75 3@30.5 x 30.5mm
M3N1-45-400/5 400/5 2.5 2.5 3.75 3@30.5 x 30.5mm
M3N1-45-500/5 500/5 2.5 2.5 3.75 3@30.5 x 30.5mm
M3N1-45-600/5 600/5 2.5 2.5 3.75 3@30.5 x 30.5mm
M3N1-45-630/5 630/5 2.5 2.5 3.75 3@30.5 x 30.5mm

Burden VA against class index
Class 0.5 Class 1 Class 3

Aperture (mm)

M3N1-25

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M3N1-35

M3N1-45