Hirschmann RS20 series User Manual page 7

Supply voltage

The supply voltage is electrically isolated from the housing.
 The devices are designed for operation with safety extra-low voltage.
Connect only SELV circuits with voltage restrictions in line with IEC/EN
60950-1 to the supply voltage connections and signal contacts.
 Connect only a supply voltage that corresponds to the type plate of
your device.
 Observe the maximum values for the contact load of the signal
contact.
 Relevant for North America:
The device may only be connected to a Class 2 supply voltage that
fulfills the requirements of the National Electrical Code, Table 11(b). If
the voltage is being supplied redundantly (two different voltage
sources), the combined supply voltages must fulfill the requirements of
the National Electrical Code, Table 11(b).
 Relevant for North America: For use in class 2 circuits.
Use 60/75 °C (140/167 °F) or 75 °C (167 °F) copper (Cu) wire only.
 Relevant for North America
for devices certified for hazardous locations:
Power, input and output (I/O) wiring must be in accordance with
Class I, Division 2 wiring methods [Article 501-4(b) of the National
Electrical Code, NFPA 70] and in accordance with the authority having
jurisdiction.
Start connecting the electrical wires only if all the above safety
requirements are fulfilled.
 Enable the supply voltage for the device only when the following
requirements are fulfilled:

the housing is closed
 the terminal blocks are wired correctly

the terminal blocks for the power supply are connected
 Internal fuses are triggered only in the case of a detected error in the
device. In case of damage or malfunction of the device, turn off the
supply voltage and return the device to the plant for inspection.
Installation RS20/22/30/32/40
Release 05 12/2015
7