STW20K ZIEHL | Alldatasheet
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3 current transformers STWA1 AND-evaluation relay output 2 CO Switching point approx. AC 1 A LED-display for power on and alarm housing design K Current-Relay STW20K AC-Detection, AND-Evaluation, 3 Transformers Technical Data The current relay STW20K moni- tors 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. The relay works in closed circuit current. When voltage is applied to the STW, the relay signals an alarm until the it has picked up. Applications: Identifies power failure with 1- or 3-phase electrical consumers, e.g. with monitoring of heating elements or heating installations where a constant heating has to be guaranteed. A further application is the identifi- cation of phase failure, monitoring of fuses, or triggering of operating hours counters. If the switching threshold is not reached due to low currents of less than 1 A, the monitored wire should be led multiple times through the transformer. Not required inputs have to be con- nected to a occupied input. Power supply Us Output relay Type of contact Function Transformer input Overload cap.continous/max 10s Switching point on Switching point off Tolerance Switch-off delay Switch-on delay Testing conditions rated ambient temperature range Dimensions H x B x T Protection housing / terminals Weight AC/DC 24 - 240 V, 0/50/60 Hz, < 1 W, < 4 VA (DC 20 - 297 V, AC 20 - 264 V) 2 CO type 2 see "general technical informations" 3 channel/AND 1 to 3, type STWA 1
100 A / 300 A
≤ AC 1 A ≥ AC 0,3 A ± 20% approx. 0,3 s approx. 0,3 ms see "general technical informations" -20°C…+55°C design K: 75 x 22,5 x 110 [mm], 12-pol IP 30 / IP 20 approx. 120 g A1 A2 14 11 12 24 21 22 2 103 STW20K Stromrelais rt gnUe = 250 V Ie = 3 A AC 15 AC/DC 24...240 V 0/50/60 Hz <2 W <4 VA ON ALARM .com ~+ Us ~– N ALARMK1 F1 F2 F3 Us M 3 ~ 3x Stromwandler/ current transformer STWA1(H) STWA1H (+) = 1...3 STWA1H (-) = 0 2015-09-04 Current recognition Type STW STW20K Part number: S225121 AC/DC 24-240 V