Current Relay for AC-Detection, OR-Evaluation of 1-8 Transformers
The basic function of the device is to detect whether a current is flowing in the supply line of one of several woodworking machines. If a current flow is detected, the device switches on a suction system. When the last machine is switched off, the device stops the extraction system after a delay.
Current relay in OR evaluation with 8 inputs, designed e.g. for controlling of suction plants in the timber and plastics processing industry. When there is an AC-current >1 A through one of up to 8 connected transformers STWA 1, the integrated relay (1co) picks up. When all currents are 0, the relay releases with a delay of approx. 10s. This enables a run-after of the central suction.
- 8 inputs
- relay picks up if at least 1 input is activated
- Connection of current transformers STWA1 or STWA1H
- operating value approx. 1 A
- turn-off delay approx. 10 s
- not necessary inputs remain open
- switch-on delay 3 s
- without switch-off delay
Rated supply voltage Us
AC 220 - 240 V +10-15%, < 3 VA, 50/ 60 Hz
AC/DC 24 V, DC 21-30 V, AC 20,4 - 26,4 V
1…8, type STWA1 or STWA1H
Overload cap.continous/max 10s
100 A / 300 A
Switching point on
≤ AC 1 A
Switching point off
> AC 0,3 A
approx. 10 sec.
approx. 0,5 sec.
1 change-over contact (co)
Type of contact
type 2, see general technical informations
Rated ambient temperature range
Dimensions (h x w x d)
Design K: 75 x 22.5 x 115mm
on 35 mm DIN rail according to DIN EN 60715 or with screws M4 (option)
Protection housing / terminals
IP 40 / IP 20
approx. 140 g