Current Sensing Relay module

Application

Of course, the CSR 4...20mA may also be connected to signal current circuits 0...20mA where, however, the switching function below 2 mA is not required.

The CSR module is electrically capable of operaring over a range of 9 1/2 V DC to 40 V DC. This module is unique in that it has built in processing which allows it to detect a current level between 4 mA DC and 20mA DC. The current level that triggers the relay can be user adjusted throughout that range, by means of a potentiometer on the face of the unit.

Additionally, both the control electronics and dry contact relay are built into a single package. This results in a savings of rail space.

The output is a potential-free relay changeover contact, which can switch relatively large loads up to a maximum voltage of 380 V.

The input is not isolated against the supply voltage.

Should this feature be required, then modules from the UET or UET-P series must be selected.

57.802.3053.0 [Schematic]
Power Supply
VDC with filter	9.5V...40V
VDC without filter	8V...27V
Power consumption at 40V
-relay disconnected	ca. 7 mA
-relay connected	ca. 35 mA
Input
Current input	4...20mA
Operating point	2...20 mA
Residual ripple
-with 22 mA measuring current	5 mAss
-with 2 mA measuring current	0.5 mAss
Switching threshold	ca. 0.4 mA
Output
Max. switching voltage	380 VAC/ 125 VDC
Max. switching current	7 A
Max. swithing capacity	1750 VA/ 210 W
Perm minimum load	5 VDC/ 10 mA
Contact rated load	250 VAC, 7A/ 30 VDC, 7A
Dielectric strength
Input - Output	250 V eff
Insulation voltage terminal TS	2 kV eff