ES-3373 Rev.10

LTCEC

Power Transducer Series LT-UNIT

AC CURRENT TRANSDUCER

(clamp-on current sensor; RMS sensing)
Functions & Features
• Converts an alternating current into a standard
process signal
• Easy-to-install clamp-on type current sensor
without needing a current transformer
• Clamp-on current sensor included
• Wide input range from 10 A up to 600 A
• Input frequency 50 / 60 / 400 Hz
• Over-voltage clamp element for safety in open
circuit
• High-density mounting
Typical Applications
• Centralized monitoring and control of motors at
a supervisory panel
• Monitoring abnormal load current at motors to
detect pump malfunctions

MODEL: LTCEC–[1][2][3]–[4][5]

ORDERING INFORMATION

• Code number: LTCEC–[1][2][3]-[4][5]
Specify a code from below for each of [1] through [5].
(e.g. LTCEC-150A-B/T/Q)
• Special output range (For codes Z & 0)
• Specify the specification for option code /Q
(e.g. /C01)

[1] SENSOR

1: Leadwire type CLSA
2: Screw terminal type CLSB

[2] INPUT

10: 0 – 10 A AC
15: 0 – 15 A AC
20: 0 – 20 A AC
30: 0 – 30 A AC
40: 0 – 40 A AC
50: 0 – 50 A AC
60: 0 – 60 A AC
75: 0 – 75 A AC
100: 0 – 100 A AC
125: 0 – 125 A AC
150: 0 – 150 A AC
175: 0 – 175 A AC
200: 0 – 200 A AC
225: 0 – 225 A AC
250: 0 – 250 A AC
300: 0 – 300 A AC
350: 0 – 350 A AC
400: 0 – 400 A AC
500: 0 – 500 A AC
600: 0 – 600 A AC (Not selectable with the sensor type
code 1 'Leadwire type CLSA')

[3] OUTPUT

Current
A: 4 – 20 mA DC (Load resistance 500 Ω max.)
D: 0 – 20 mA DC(Load resistance 500 Ω max.)
F: 0 – 10 mA DC (Load resistance 1000 Ω max.)
G: 0 – 1 mA DC (Load resistance 10 kΩ max.)
J: 0 – 5 mA DC (Load resistance 2000 Ω max.)
Z: Specify current (See OUTPUT SPECIFICATIONS)
Voltage
1: 0 – 10 mV DC (Load resistance 10 kΩ min.)
2: 0 – 100 mV DC (Load resistance 100 kΩ min.)
3: 0 – 1 V DC (Load resistance 1000 Ω min.)
4: 0 – 10 V DC (Load resistance 10 kΩ min.)
5: 0 – 5 V DC (Load resistance 5000 Ω min.)
6: 1 – 5 V DC (Load resistance 5000 Ω min.)
0: Specify voltage (See OUTPUT SPECIFICATIONS)

[4] AUXILIARY POWER SUPPLY

AC Power
B: 100 V AC
C: 110 V AC
D: 115 V AC
F: 120 V AC
G: 200 V AC
H: 220 V AC
J: 240 V AC
DC Power
R: 24 V DC
V: 48 V DC
P: 110 V DC

[5] OPTIONS (multiple selections)

Terminal Cover
blank: Without
/T: With
Other Options
blank: none
/Q: Option other than the above (specify the specification)

SPECIFICATIONS OF OPTION: Q

COATING (For the detail, refer to our web site.)
/C01: Silicone coating
/C02: Polyurethane coating
/C03: Rubber coating

ACCESSORIES

The clamp-on current sensor is included in the product package.
■ CLAMP-ON CURRENT SENSOR (leadwire type CLSA)
• 0 – 10 A through 0 – 75 A Use
Sensor model No.: CLSA-08
Sensor cable model No.: CLSA-08C-30
Applicable cable diameter: Max. 10.0
Sensor leadwire: AWG 22
Weight: 45 g (1.6 oz)
• 0 – 100 A Use
Sensor model No.: CLSA-12
Sensor cable model No.: CLSA-08C-30
Applicable cable diameter: Max. 16.0
Sensor leadwire: AWG 22
Weight: 70 g (2.5 oz)
• 0 – 125 A through 0 – 300 A Use
Sensor model No.: CLSA-30
Applicable cable diameter: Max. 24.0
Sensor leadwire: AWG 18, 200 mm
Weight: 200 g (7.1 oz)
• 0 – 350 A through 0 – 500 A Use
Sensor model No.: CLSA-50
Applicable cable diameter: Max. 36.0
Sensor leadwire: AWG 18, 200 mm
Weight: 300 g (10.6 oz)
■ CLAMP-ON CURRENT SENSOR (screw terminal type CLSB)
Connection: M3 screw terminal (torque 0.5 N·m)
Screw terminal: Nickel-plated steel
Output wiring: Use AWG22 or thicker wires for the output. Twist the paired wires, extendable up to 30 meters.
• 0 – 10 A through 0 – 50 A Use
Sensor model No.: CLSB-05
Applicable cable diameter: Max. 10.0
Weight: 45 g (1.6 oz)
• 0 – 60 A through 0 – 100 A Use
Sensor model No.: CLSB-10
Applicable cable diameter: Max. 16.0
Weight: 80 g (2.8 oz)
• 0 – 125 A through 0 – 200 A Use
Sensor model No.: CLSB-20
Applicable cable diameter: Max. 24.0
Weight: 200 g (7.1 oz)
• 0 – 225 A through 0 – 400 A Use
Sensor model No.: CLSB-40
Applicable cable diameter: Max. 35.0
Weight: 300 g (10.6 oz)
• 0 – 500 A through 0 – 600 A Use
Sensor model No.: CLSB-60
Applicable cable diameter: Max. 35.0
Weight: 360 g (12.7 oz)
Note 1: The output values may vary depending on the accuracy of engagement at the clamp connection.
Note 2: The sensor is detachable up to 100 times (approx.).
Note 3: The sensor’s mechanical construction may cause it to generate resonance sound. However, it does not affect the performance of the sensor.

GENERAL SPECIFICATIONS

Connection: M4 screw terminals (torque 1.2 N·m)
Screw terminal: Chrome-plated steel
Housing material: Flame-resistant resin (black)
Isolation: Sensor core to sensor output or input to output to auxiliary power
Input waveform: Up to 15 % of 3rd harmonic content
Overrange output: 0 to 120 % at 1 – 5 V
Zero adjustment: -5 to +5 % (front)
Span adjustment: 95 to 105 % (front)

INPUT SPECIFICATIONS

Frequency: 50 / 60 / 400 Hz
Overload capacity
CLSA-08: 120 A continuous
CLSA-12: 300 A continuous
CLSA-30: 360 A continuous
CLSA-50: 600 A continuous
CLSB-05: 100 A continuous
CLSB-10: 200 A continuous
CLSB-20: 300 A continuous
CLSB-40: 600 A continuous
CLSB-60: 720 A continuous
Operational range: 0 – 120 % of rating
Note: Be sure that the input voltage is of 440 V or less.

OUTPUT SPECIFICATIONS

■ DC Current: 0 – 20 mA DC
Minimum span: 1 mA
Offset: Max. 1.5 times span
Load resistance: Output drive 10 V max.
■ DC Voltage: 0 – 12 V DC
Minimum span: 5 mV
Offset: Max. 1.5 times span
Load resistance: Output drive 1 mA max.; at ≥ 0.5 V

INSTALLATION

Auxiliary Power
•AC: Operational voltage range: rating -15/+10 %,
50/60 Hz, approx. 3 VA
•DC: Operational voltage range for R, V: Rating
±10 % or P: 85 – 150 V; ripple 10 %p-p max.
approx. 1.7 W (15 mA at 110 V)
Operating temperature: -10 to +55°C (14 to 131°F)
Operating humidity: 30 to 85 %RH (non-condensing)
Mounting: Surface or DIN rail
Weight: 450 g (0.99 lb)

PERFORMANCE in percentage of span

Accuracy: ±0.5 % (±1.0 % at 400 Hz) at 23°C ±10°C
or 73.4°F ±18°F, 45 – 65 Hz
Magnetic field (ext. origin) effect: ± 0.5 % (400 A/m)
Response time: ≤ 1 sec. (0 – 100 % ±1 %)
Ripple: 0.5 %p-p max.
Line voltage effect: ±0.25 % over voltage range
Insulation resistance: ≥100 MΩ with 500 V DC
(input to output to auxiliary power)
≥100 MΩ with 500 V DC
(sensor core to sensor output)
Dielectric strength: 2000 V AC @ 1 minute
(input to output to auxiliary power to ground)
1000 V AC @ 1 minute
(sensor core to sensor output)
Impulse withstand voltage: 1.2 / 50 μsec., ±5 kV
(input to output or ground)