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Temperature Relays and MINIKA®
Operating manual STWA1
- 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
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 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.
2 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
STWA1
12050-0701-00
Mains Monitoring
Digital Panelmeters MINIPAN®
Switching Relays and Controls
Page 1 / 4
ZIEHL industrie – elektronik GmbH + Co KG
Daimlerstr.13, 74523 Schwäbisch Hall, Germany
+ 49 791 504-0,
info@ziehl.de,
Measuring Transducers
Grid- and Plant Protection
updated: 2018-12-10 Fu
www.ziehl.de
www.ziehl.de
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Summary of Contents for ZIEHL STWA1
- Page 1 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.
-
Page 2: Important Information
An "open mode", i.e. operation of the current transformer without secondary wiring, should be avoided. 4 Installation The current transformer STWA1 is intended for installation in dry rooms. The STWA1 can be mounted as follows: • simply plug over the conductor to be monitored •... -
Page 3: Technical Data
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 ➢... - Page 4 Wire LiYv 7x 0.25 (0.34 mm²) AWG 22 black Wirelength 2 x 1000 mm Stripping length 10 mm Opening for primary conductor 11 mm Mounting position Weight ~ 43 g Subject to technical changes 7 Housing STWA1 12050-0701-00 Page 4 / 4 www.ziehl.de...