Introduction
The DIN rail power supply units in the NDR series are specially designed for use in industrial applications. Thanks to their slim design of 40 to 63 mm, the power supply units can be easily installed in small and confined spaces such as control cabinets. The wide operating temperature range of -20 to 70°C makes them suitable for use in harsh environments. The devices have a metal housing, an AC input range of 90 VAC to 264 VAC and comply with the EN 61000-3-2 standard. In addition, these power supply units have a constant current mode that provides overload protection.

Specifications

Output power parameters
– Wattage:
NDR-120-24: 120 W
– Voltage:
NDR-120-24: 24 VDC
– Rated current:
NDR-120-24: 0 to 5 A
– Ripple and noise:
NDR-120-24: 120 mVp-p
– Voltage adjustment range:
NDR-120-24: 24 to 28 VDC
– Set-up/start-up time at full load:
NDR-120-24: 2500 ms, 60 ms at 115 VAC
NDR-120-24: 1200 ms, 60 ms at 230 VAC
– Typical hold-off time at full load:
NDR-120-24: 10 ms at 115 VAC
NDR-120-24: 16 ms at 230 VAC

Input power parameters
– Typical efficiency:
NDR-120-24: 88%
– Typical current:
NDR-120-24: 1.3 A @ 230 VAC, 2.25 A @ 115 VAC
– Voltage range:
90 to 264 VAC (47 to 63 Hz)
127 to 370 VDC
– Inrush current (cold start): 35 A @ 230 VAC, 20 A @ 115 VAC

Overload protection
– Rated output power: 105 to 160%
– Protection type: Constant current limit, automatic recovery after fault condition removed

Overvoltage protection
– Overvoltage range:
NDR-120-24: 29 to 33 V
– Degree of protection: Operating voltage cut-off, restart for recovery

Physical properties
– Housing: Metal
– Dimensions:
NDR-120-24: 123.75 x 125.20 x 40 mm (4.87 x 4.93 x 1.57 in.)
– Weight:
NDR-120-24: 500 g (1.10 lb)

Environmental limits
– Operating temperature:
NDR-120-24: -20 to 65°C (-4 to 149°F)
– Storage temperature: -40 to 85°C (-40 to 185°F)
– Ambient relative humidity: 20 to 95% (non-condensing)
– Max. Max. operating temperature at full load:
NDR-120-24: 45°C (113°F)

Standards and certifications
– Safety:
UL 508
EN 62368-1
IEC 62368-1
– EMC:
EN 55032/35
EN 61000-3-2 Class A
EN 61000-3-3
EN IEC 61204-3
EN IEC 61000-6-2
– EMS:
IEC 61000-4-2 ESD: Contact: 4 kV; Air: 8 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 10 V/m
IEC 61000-4-4 EFT: Power: 2 kV
IEC 61000-4-5 Surge: Power: 4 kV
IEC 61000-4-6 CS: 0.15 kHz to 80 MHz: 10 Vrms
IEC 61000-4-8: 30 A/m
IEC 61000-4-11

MTBF
– Standards: MIL-HDBK-217F
– Time:
NDR-120-24: 453,334 hours