G - AA Electric

Overvoltage protection for energy distribution systems
Overvoltage protection
I
Overvoltage protection class III
Low voltage consumers, small distribution boards and
electronic devices
Overvoltage protection class III (D arrestors)
Weidmüller overvoltage protection PU D protects low voltage
consumers and electronic devices from overvoltage caused by
atmospheric discharge (thunderstorms) or switching procedures
(transients). PU D can be mounted in small or storey
distribution boards.
PU D corresponds to the requirements of DIN VDE 0675 part
6 class C 11/89, part 6 A2 10/96 and IEC 61643-1 02/98.
Electrical connection
PU D overvoltage protection is installed after the PU C before
the device or consumer being protected. It protects circuits up
to 16 A, including monitors, for example.
Type PO DS is suitable for installation in devices or cable conduits
on site.
Functional checks and maintenance
Ageing of the varistors can cause high temperatures, with a
risk of fire in low voltage systems. The integrated temperature
monitoring automatically disconnects the varistor from the
power supply. This is indicated by the activation of the glow
lamp. Types PO DS and PU DS are also equipped with a
switching contact to issue a corresponding warning.
The back-up fuse depends on the conductor cross-section
and type of routing. For PU D arrestors, the current carrying
capacity is up to 16 A.
The connection is rated to IEC 947-7-1 for the following crosssections:
– solid: 0,5 ... 2,5 mm 2 ,
– flexible: 0,5 ... 2,5 mm 2 .
The operating temperature range is –25°C … +55°C,
the storage temperature range is –40°C to +60°C.
Dimensioned drawing
PU D /PU 3 D
Width 54 mm
Dimensioned drawing
PU DS
Width 18 mm
Dimensioned drawing
PO DS
Housing depth 18 mm
Sold by AA Electric 1-800-237-8274 Lakeland, FL • Lawrenceville, GA • Greensboro, NC • East Rutherford, NJ www.A-Aelectric.com
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