Installation Manual
Type
：
DR-RDN20 DIN rail peripheral
DR-RDN20
INPUT
：
A
：
21-28VDC 20A
OUTPUT
：
20A (max)
B
：
21-28VDC 20A
Introduction
DR-RDN20 is a DIN rail peripheral
for
the redundant module.
Like other Mean Well’s DIN series, they can be mounted on a TS35 Standard DIN rail.
Installation
（
1
）
Always allow good ventilation clearances, 5mm left and right, 40mm above and 20mm below, around the unit
in use to prevent it from overheating. Also a 10-15 cm clearance must be kept when the adjacent device is a
heat source.
（
2
）
The appropriate mounting orientation for the unit is vertical, the TB1 terminals at the bottom. Mounting
orientations other than that, such as upside down, horizontal, or table-top mounting, is not allowed.
（
3
）
Use copper wire only, and recommended wires are shown as below.
AWG
18
16
14
12
10
Rated Current of
Equipment (Amp)
7A
10A
15A
20A
30A
Cross-section of
Lead(mm
2
)
0.8
1.3
2.1
3.3
5.3
Note: 1. Current each wire carries should be de-rated to 80% of the current suggested
above when using 5 or more wires connected to the unit.
2. The maximum allowable wire cross-sectional area for the terminal is 10 AWG/
5.3 mm
2
.
Make sure that all strands of each stranded wire enter the terminal connection and the screw terminals are
securely fixed to prevent poor contact. If the power supply possesses multi-output terminals, please make
sure each contact is connected to wires to prevent too much current stress on a single contact.
（
4
）
Use wires that can withstand temperatures of at least 80°C, such as UL1007.
（
5
）
Recommended wire strapping length is 5mm (0.197”).
（
6
）
Recommended screwdriver is 4mm, slotted type.
（
7
）
The recommended torque setting for terminals is 10kgf-cm(9Lb-in).