MR SERIES MEASURING RANGE
A comprehensive range of measuring ring current transformers for installation where
reliability, accuracy and quality are required.
Construction
High grade silicon iron cores are carefully selected, then insulated and protected by
a polypropylene covering on which the secondary winding is toroidally wound by
precision winding machines. Multi layers of polyester and PVC are then applied to
provide a tough moisture resistant coating.
Specifications
System voltage: 720V maximum
Test voltage: 3kV for 1 minute
System frequency: 50/60Hz
Overload withstand: 1.2 x rated current continuously
Short circuit thermal 60 x rated primary current for 1 second current (Ith)*:
Dynamic current (Idyn)*: = 2.55 x Ith
Service temperature: -20°C to 70°C
Features
• Available in a wide range of
transformer ratings
• Accuracy up to Class 0.5
• Measuring or protective types
Secondary current: 5A or 1A
Complies with: IEC60044-1, BSEN60044-1
Saturation coefficient: <6
Humidity: Up to 95% RH (non condensing)
Insulation class: BSEN60085 Class Y
Mounting hardware: Foot mounted
Benefits
• Long product life
Applications
• Switchgear
• Control panels
• Overload protection
• Control devices
Dimensions
Loss in copper wires between instrument and CT
for 5A secondary
Wire section
2
in mm
1.5 0.60 1.19 2.38 3.57 4.76 5.95
2.5 0.36 0.71 1.43 2.14 2.86 3.57
4 0.22 0.45 0.89 1.34 1.79 2.23
6 0.15 0.30 0.60 1.89 1.19 1.49
10 0.09 0.18 0.36 0.54 0.71 0.89
1m 2m 4m 6m 8m 10m
Loss in VA (for both wires)
Loss in copper wires between instrument and CT
for 1A secondary
Wire section
2
in mm
1 0.36 0.71 1.43 2.14 2.86 3.57
1.5 0.24 0.48 0.95 1.43 1.90 2.38
2.5 0.14 0.29 0.57 0.86 1.14 1.43
4 0.09 0.18 0.36 0.54 0.71 0.89
6 0.06 0.12 0.24 0.36 0.48 0.60
10 0.04 0.07 0.14 0.21 0.29 0.36
10m 20m 40m 60m 80m 100m
Loss in VA (for both wires)
* Thermal current (Ith) & dynamic
current (ldyn).
lth is the highest primary current
(effective value), the ldyn is the
highest primary current (peak
value) that the CT can support for
1 second without damage, owing to
excessive overloads with secondary
short circuits.
PAGE 2
MR SERIES MEASURING RANGE
MR transformers are used to accurately measure high alternating primary currents,
converting the primary current into a proportional secondary current as required
for measurement and instrumentation. They are available in 5 amp or 1 amp
secondary versions.
Part number Ratio range Class 3 Class 1 Class 0.5 A B C D Approx. weight
MR-28-40/5A 40/5 1.5 - - 28 70 40 77.5 0.5
MR-28-50/5A 50/5 2 - - 28 70 40 77.5 0.5
MR-28-60/5A 60/5 2.5 - - 28 70 40 77.5 0.5
MR-28-40/1A 40/1 1.5 - - 22 60 50 70 0.5
MR-28-50/1A 50/1 2 - - 22 60 40 70 0.5
MR-28-60/1A 60/1 2.5 - - 22 60 40 70 0.5
MR-42-80/5A 80/5 1.5 - - 42 80 30 86 0.5
MR-42-100/5A 100/5 3.75 1.25 - 42 80 30 86 0.5
MR-42-150/5A 150/5 5 2.5 1 42 80 30 86 0.5
MR-42-200/5A 200/5 7.5 5 2.5 42 80 30 86 0.5
MR-42-250/5A 250/5 10 5 2.5 42 80 30 86 0.5
MR-42-80/1A 80/1 1.5 - - 40 72 26 70 0.5
MR-42-100/1A 100/1 5 1.5 - 40 72 45 70 0.5
MR-42-150/1A 150/1 5 3 - 40 72 40 70 0.5
MR-42-200/1A 200/1 7.5 5 3 40 72 40 70 0.5
MR-42-250/1A 250/1 10 7.5 2.5 40 72 40 70 0.5
MR-45-300/5A 300/5 10 7.5 3.75 45 80 30 86 0.5
MR-45-400/5A 400/5 15 7.5 5 45 80 30 86 0.5
MR-45-300/1A 300/1 10 10 5 45 83 32 100 0.5
MR-45-400/1A 400/1 15 10 5 45 83 32 100 0.5
MR-60-400/5A 400/5 15 7.5 5 60 100 30 86 0.5
MR-60-500/5A 500/5 15 10 5 60 100 30 86 0.5
MR-60-600/5A 600/5 20 10 7.5 60 100 30 86 0.5
MR-60-400/1A 400/1 15 7.5 5 58 100 30 100 0.5
MR-60-500/1A 500/1 20 15 5 58 100 32 100 0.5
MR-60-600/1A 600/1 20 15 10 58 100 32 100 0.
MR-85-800/5A 800/5 20 10 7.5 85 124 30 86 0.5
MR-85-1000/5A 1000/5 30 15 10 85 124 30 86 1
MR-85-1200/5A 1200/5 30 15 10 85 124 30 86 1
MR-85-1500/5A 1500/5 30 15 10 85 124 30 86 1
MR-85-1600/5A 1600/5 30 15 10 85 124 30 86 1
MR-85-800/1A 800/1 20 15 10 84 122 30 100 0.5
MR-85-1000/1A 1000/1 25 20 15 94 135 30 100 1
MR-85-1200/1A 1200/1 25 20 15 94 135 30 100 1
MR-85-1500/1A 1500/1 25 20 15 94 135 30 100 1
MR-85-1600/1A 1600/1 25 20 15 94 135 30 100 1
MR-125-2000/5A 2000/5 30 20 15 125 160 30 86 1
MR-125-2500/5A 2500/5 30 20 15 125 160 30 861 MR-125-3000/5A 3000/5 30 20 15 125 160 30 86 1
MR-125-4000/5A 4000/5 30 20 15 125 160 30 86 1
MR-125-2000/1A 2000/1 25 20 15 132 175 30 150 1.5
MR-125-2500/1A 2500/1 25 20 15 132 175 30 150 1.5
MR-125-3000/1A 3000/1 25 20 15 125 180 32 150 1.5
MR-125-4000/1A 4000/1 25 20 15 140 215 45 150 4.5
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