Note
When connecting an external 24VDC power supply to the interfaces, this must satisfy the
requirements of a protective extra low voltage (PELV) according to UL 61010. A series fuse must
also be used which reliably trips within 120 seconds at an ambient temperature of 0 °C when a
short-circuit occurs.
For a primary supply of the power supply used from OVC III circuits up to 600 V AC (line to neutral
voltage), it must be ensured that the contact gap of the fuse – or the individual fault-proof circuit
– is 3.0mm according to UL 61010.
When using an external power supply, ensure that the fuse used has a trip rating that
corresponds to the maximum possible short-term short-circuit current of the power supply unit
being used.
Table 8-2 X124 interface
Characteristics Version
Connector type 4-pin screw-type terminal
Number of cables that can be connected 1
Connectable cable types and conductor cross-sec‐
tions
Rigid 1.3mm²… 2.5mm²
Flexible 1.3mm²… 2.5mm²
Flexible, with end sleeve without plastic
sleeve
1.3mm²… 2.5mm²
Flexible, with end sleeve with plastic sleeve 1.3mm²… 2.5mm²
AWG/kcmil 16... 14
Stripped length 6… 7mm
Tool Screwdriver 0.5x 3mm (M2.5)
Tightening torque 0.4 to 0.5Nm
Max. current carrying capacity, incl. loop-through 20A
*)
(15 A according to UL/CSA)
Max. cable length 10m
*)
This value must be taken into consideration for the current-carrying capacity of the power supply cable.
The following cable lugs may be used:
• Crimped cable lug to DIN 46234
• Pressed cable lug to DIN 46235
• Tube-type cable lug to SN 71322
• Tube-type cable lug "Klauke R Series", UL Category ZMVV
Connecting
8.5Power supply
NCU 1750
Equipment Manual, 10/2023, A5E45627807B AH 65
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