Data Sheet for Product
Technical Specification Sheet
Document No. 149-407
May 28, 2019
Siemens Industry, Inc.
Page 1 of 2
Midi and Mini Hinged Split-Core
Current Transformers
Description
Siemens Midi and Mini Hinged Split-Core Current
Transformers (CTs) are small, low-cost devices with
high accuracy over a wide dynamic range with
excellent phase shift. These current transformers are
ideal where space is limited such as when metering
multiple loads within a panel board. Use for current
measurement, energy metering, load surveys, demand
metering, energy research, and sub-metering. These
devices are targeted for use with the Siemens MD
Series Power Meters.
Features
• Window sizes:
0.4" (10 mm) for 50A (Mini)
1.0" (25 mm) for 100A, 200A (Midi)
• Available in three current ranges*:
0.25 to 80A AC (for 50A)
1.0 to 200A AC (for 100A)
1.0 to 300A AC (for 200A)
• Output:
333 mV @ 50A AC (6.66 mV/A AC) (for 50A)
333 mV @ 100A AC (3.33 mV/A AC) (for 100A)
333 mV @ 200A AC (1.67 mV/A AC) (for 200A)
• Ratio Error:
<0.5% from 1.0A to 80A AC (typical) (for 50A)
<0.3% from 1.0A to 200A AC (typical) (for 100A)
<1.0% from 1.0A to 300A AC (typical) (for 200A)
• Phase Error:
<1.5° from 1.0A to 80A AC (for 50A)
<2° from 0.2A to 1A AC (for 50A)
<0.5° from 1.0A to 200A AC (for 100A)
<0.5° from 1.0A to 300A AC (for 200A)
* May depend on meter compatibility. See associated
Meter Specifications for details.
Midi Hinged Split-Core Current Transformer
Table 1. Dimensions in Inches (Millimeters).
Model
Dimensions
A
B
C
D
E
F
G
H
Mini
1.64
(41.7)
1.00
(25.3)
1.04
(26.4)
0.60
(14.9)
1.16
(29.4)
0.92
(23.4)
0.40
(10.2)
N/A
Midi
2.76
(70.1)
1.62
(41.2)
1.52
(38.6)
0.80
(20.4)
2.00
(50.8)
1.71
(43.5)
1.00
(25.4)
1.85
(47.0)