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Basic Information and Definitions Inductive sensors Supply voltage UB ... is the permissible voltage range in which certain safe operation of the switch is guaranteed (including ripple σ).It is indicated in the catalog section for each product. Rated operating voltage Ue ... is the supply voltage UB used for testing without tolerances. To determine the rated and limit values, the sensor must be operated using Ue. It is: – for DC switches Ue = 24 VDC – for AC and AC/DC switches Ue = 110 VAC – for AC and AC/DC switches Ue = 110 VAC Voltage drop Ud ... is the voltage measured across the load of a closed (conducting) sensor at load current Ie. Rated insulation voltage Ui ... of a proximity switch is the voltage to which the isolation tests and the creep distances are referenced. For proximity switches the highest rated operating voltage must be considered as the rated isolation voltage. Rated supply frequency ... of the power supply for AC devices is 50 to 60 Hz. Ripple σ (%) ... is the AC voltage (peak-to-peak of Ue) overlaid on the DC voltage Ue given in percent. To operate DC switches, a filtered DC voltage having a ripple of max. 15 % (per DIN 41755) is required. Ue=rated operational voltage Uss= oscillation width Ripple σ = 956 Uss × 100 [%] Ue Rated operating current Ie ... is the permissible constant output current that may flow through the load Rl. Off-state current Ir ... is the residual current flowing through the load when a proximity switch is not conducting (open). Max. inrush Ik ... in the case of alternating current indicates the current Ik (Aeff) which is permitted to flow during a given turn-on time tk (ms) and at a given frequency (Hz). Short circuit current ... is 100 A, i. e., per EN 60947-5-2 the power supply during testing in short circuit mode must be able to provide at least 100 A for a short duration. This current is prescribed in the standard in order to test the short-circuit strength. No-load supply current I0 ... is the current, which flows in the switch, without the need for a load to be connected (only with 3- and 4-wire-switches).This current supplies the sensor electronics. For more information, visit us online!