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ZIEHL    industrie 

–  elektronik    GmbH    +  Co    KG 

Daimlerstr.13,  74523  Schwäbisch  Hall,  Germany 
+ 49 791 504-0,    info@ziehl.de,    www.ziehl.de 

 
 

 

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Operating manual STWA1 

 

updated: 2018-12-10 Fu 

 

 

 

 

STWA1 

12050-0701-00 

Page

 

1 / 4 

www.ziehl.de 

- Current transformer for AC current detection - accessories for current relay STW  

 
 
 
 

 

 
 

 
Table of contents 

 

1

 

Application and short description ......................................................................................................... 1

 

2

 

Overview of functions ............................................................................................................................ 1

 

3

 

Important Information ............................................................................................................................ 2

 

4

 

Installation .............................................................................................................................................. 2

 

5

 

Connecting diagram ............................................................................................................................... 3

 

5.1

 

Tips................................................................................................................................................ 3

 

6

 

Technical data ........................................................................................................................................ 3

 

7

 

Housing ................................................................................................................................................... 4

 

 

Application and short description 

Current transformers STWA1 are inductive working single-ended current transformers. Due to the applied 
measuring principle, these current transformers are only suitable for alternating current. The current 
transformer STWA1 is used together with ZIEHL current relay type STW for current detection and control of 
extraction systems. The level of the current to be monitored is limited to 100 A continuously, 300 A for max. 
10s. The electrical connection is made via the lead out black cable. 
 

Overview of functions 

 

Current transformer for alternating current detection

  

  connection to current-relays type STW 

  no supply-voltage required 

  plug-in current transformer (Ø 11 mm) 

 

length of the fixed connection cable 1000 mm

 

 

Summary of Contents for STWA1

Page 1: ... 3 5 1 Tips 3 6 Technical data 3 7 Housing 4 1 Application and short description Current transformers STWA1 are inductive working single ended current transformers Due to the applied measuring principle these current transformers are only suitable for alternating current The current transformer STWA1 is used together with ZIEHL current relay type STW for current detection and control of extraction...

Page 2: ...phical scope the valid and relevant regulations of the corresponding country DANGER Hazardous voltage Will cause death or serious injury Turn off and lock out all power supplying this device before working on this device DANGER In a non loaded open secondary circuit of the current transformer STWA1 high voltages are induced at the secondary terminals For primary currents 16 A this voltage can be d...

Page 3: ...Limit too low small loads shall not be recognized Connect a resistor 0 25 W 200 V in parallel to the current transformer STWA1 H resistor 750 Ohm enhancement by factor 2x resistor 330 Ohm enhancement by factor 4x resistor 150 Ohm enhancement by factor 10x Because of high tolerances we recommend to determine the best value by try out 6 Technical data Input primary conductor Rated thermal continuous...

Page 4: ...100 Hz 1 g 2 25 Hz 1 6 mm 25 150 Hz 5 g Housing clip on Housing material Polyamide PA66 blue Flammability UL94 V 2 Grouting 2 component silicon RTV627 Protection class IP 20 Outside diameter 31 3 mm Height 18 mm Connection cable Wire LiYv 7x 0 25 0 34 mm AWG 22 black Wirelength 2 x 1000 mm Stripping length 10 mm Opening for primary conductor 11 mm Mounting position any Weight 43 g Subject to techn...

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