© 2016 Littelfuse Protection Relays & Controls

www.littelfuse.com/

Rev: 1-A-062716

Protection Relays

Current Monitoring Relays and Transducers

www.littelfuse.com/tcsa

TCSA SERIES

Description

The TCSA Series is a loop-powered, linear output current

transducer that provides an output that is directly proportional

to the RMS AC current passing through the onboard toroid. The

TCSA provides a 4 - 20mA output over a power supply range of

10 - 30VDC. Each unit is factory calibrated for monitoring in one

of four ranges; 0-5, 0-10, 0-20, or 0-50A. The 0 - 5A range allows

the use of external current transformers so loads up to 1200AC

amps can be monitored.

Operation

The TCSA varies the effective resistance of its output in direct

proportion to the current flowing in the monitored conductor.

The unit is factory calibrated so that 0 amps provides a 4mA

output and full span provides a 20mA output. Zero and span

adjustments are provided for minor calibration adjustments in

the field (if required).

Using an External CurrentTransformer (CT)

Select a 2VA, 0 to 5A output CT, rated for the current to be

monitored. Select TCSA5. Pass one of the CT’s secondary wire

leads through the TCSA’s toroid. Connect the CT’s secondary

leads together.

1

2

4

10

20

18

16

14

12

10

8

6

4

2

4

8

20

3

6

12

30

4

8

16

40

5

10

20

50

0

Features

J

J

Monitors 0 - 50A in 4 ranges

J

J

Loop powered from 10 to 30VDC

J

J

Linear output from 4 - 20mA

J

J

Zero & span adjustments

J

J

Complete isolation between sensed current & control circuit

Wiring Diagram

CurrentTransducers

PS

PS = Power Supply

Z = Zero Adjust

S = Span Adjust

W = Insulated Wire Carrying

Monitored Current

PLC = PLC Analog Input

or Meter Input

Ordering Information

MODEL

CURRENT RANGE

TCSA5

0-5A

TCSA10

0-10A

TCSA20

0-20A

TCSA50

0-50A

If you don’t find the part you need, call us for a custom product 800-843-8848