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Temperature Relays and MINIKA®
Operating Manual STW20K
- Current Relay for AC-Detection, AND-Evaluation, 3 Transformers
STW20K
12440-0702-03
Mains Monitoring
Digital Panelmeters MINIPAN®
Switching Relays and Controls
Page 1 / 8
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: 2019-07-31 / Fu
www.ziehl.de
www.ziehl.de
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Summary of Contents for ZIEHL STW20K
- Page 1 ZIEHL industrie – elektronik GmbH + Co KG Daimlerstr.13, 74523 Schwäbisch Hall, Germany + 49 791 504-0, info@ziehl.de, www.ziehl.de Temperature Relays and MINIKA® Mains Monitoring Digital Panelmeters MINIPAN® Switching Relays and Controls Measuring Transducers Grid- and Plant Protection updated: 2019-07-31 / Fu...
- Page 2 Important Information ..........................4 Installation .............................. 5 Commissioning............................5 Detailed description ..........................6 Tips:............................... 6 10 Disposal ..............................6 11 Error search ............................6 12 Technical data ............................7 13 Housing Type K ............................8 STW20K 12440-0702-03 Page 2 / 8 www.ziehl.de...
- Page 3 3 Application and short description The current relay STW20K monitors the current in up to 3 lines with current transformers STWA1 (AND circuit). If there is a current in all 3 monitored lines, the relay (2 change-over contacts) picks up. If there is no current in at least one of the lines, the relay releases.
- Page 4 Instead of the industrial norms and regulations written in this instruction manual valid for Europe, you must observe out of their geographical scope the valid and relevant regulations of the corresponding country. STW20K 12440-0702-03 Page 4 / 8...
- Page 5 • Switch on supply voltage • Relay switches on when current > 1 A flows in all circuits • Relay turns off when a circuit is disconnected, not connected, or a current < 0.4 A flows. STW20K 12440-0702-03 Page 5 / 8...
- Page 6 9 Detailed description The current monitor STW20K detects whether one of max. three circuits is interrupted or no current flows. The device works exclusively with current detection transformers type STWA1, STWA1H. This transformer supplies a voltage signal of approx. 1.5 V at 1 A. This voltage is fed to a comparator in AND circuit. If voltage is applied to all inputs, the built-in relay is switched on and the contacts 11, 14 and 21, 24 are closed.
- Page 7 -5 °C …+70 °C Permissible wiring temperature 2 … 13.2 Hz ±1 mm 13.2 ... 100 Hz 1 g Vibration resistance EN 60068-2-6 2…25 Hz ±1.6 mm 25 ... 150 Hz 5 g STW20K 12440-0702-03 Page 7 / 8 www.ziehl.de...
- Page 8 Snap mounting on 35 mm standard rail EN60715 or Mounting M4 screws (additional bar not included) Mounting position Weight app. 120 g Subject to technical changes 13 Housing Type K Bottom Bolt Screw Holes for screw mounting STW20K 12440-0702-03 Page 8 / 8 www.ziehl.de...
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