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Magnelab Mini AC Current Transformer (CT) Connection Instructions 

For use with HOBO

®

 H22, U30, and RX3000 Series Data Loggers

 

© 2010–2016 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOware, and HOBOlink are registered trademarks of Onset Computer Corporation. 
Other products and brand names may be trademarks or registered trademarks of their respective owners. 

14255-D MAN-MINI-CT-x

 

Applies to these Magnelab CTs 

Onset Part No. 

Rated Current 

Output 

Magnelab Part No. 

T-MAG-0400-05 

5 Amps 

0-333mV AC representing 0 to 5 Amps AC 

SCT-0400-005  

T-MAG-0400-20 

20 Amps 

0-333mV AC representing 0 to 20 Amps AC 

SCT-0400-020 

T-MAG-0400-50 

50 Amps 

0-333mV AC representing 0 to 50 Amps AC 

SCT-0400-050 

T-MAG-0400-75 

75 Amps 

0-333mV AC representing 0 to 75 Amps AC 

SCT-0400-075 

 

 

DANGER!

—HIGH VOLTAGE HAZARD

 

 

Installing CTs in an energized electrical enclosure or on any energized conductor can result in severe injury or death. These CTs 
are for installation by qualified personnel only. To avoid electrical shock, do not perform any installation or servicing of these CTs 
unless you are qualified to do so. Disconnect and lock-out all power sources during installation and servicing. 
 

 

This document provides instructions on connecting the Magnelab CTs listed above to the 
FlexSmart

 TRMS Module used with either HOBO H22, U30, or RX3000 series data 

loggers. It also lists configuration values used by HOBOware

®

 software to configure the 

logger for each CT. 

Required 

 

Selected Magnelab CT 

 

HOBO H22, U30, or RX3000 series data logger 

 

FlexSmart TRMS Module, Onset Part No: S-FS-TRMSA (for H22 series only) or  
S-FS-TRMSA-D (for H22, U30, or RX3000 series) 

 

HOBOware software, version 2.2.1 or higher (2.4.0 or higher for U30 series) 

 

HOBOlink (for RX3000 series) 

 

Dimensions 

Dimensions 

3.962 cm (1.56 in.) 

2.54 cm (1.00 in.) 

1.016 cm (0.40 in.) 

2.54 cm (1.00 in.) 

2.667 cm (1.05 in.) 

 

 

 

 

Magnelab Mini AC  

Current Transformer 

www.

GlobalTestSupply

.com

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