Technical data

Degree of protection 45
Degree of protection
Ingress Protection (IP) is a classification for degrees of pro-
tection which are defined in IEC 60529 and DIN 40050. The
standards describe the classification of degrees of protec-
tion by means of housings for electrical equipment. They
are used for operator protection and guard against the in-
gress of solids and liquids.
Nomenclature for degrees of protection
The IP degree of protection is classified using code letters and
a two digit number. The higher the two numbers, the better
the protection.
■ The first IP digit represents protection against solid bodies.
Foreign bodies of various particle sizes as far as dust are dis-
tinguished here.
■ The second digit represents protection against water drop-
lets that drip onto the connector from different angles,
spray water, water jets and submersion of the connector in
a liquid.
1. 2. Brief description Definition
0
Not protected
1
Protected against solid foreign bodies ≥ 50 mm The object probe, sphere of 50 mm ∅ must not penetrate fully.
2
Protected against solid foreign bodies ≥ 12.5 mm The object probe, sphere of 12.5 mm ∅ must not penetrate fully.
3
Protected against solid foreign bodies ≥ 2.5 mm The object probe, sphere of 2.5 mm ∅ must not penetrate at all.
4
Protected against solid foreign bodies ≥ 1 mm The object probe, sphere of 1 mm ∅ must not penetrate at all.
5
Dust protected The ingress of dust cannot be totally prevented. The dust must not penetrate in
such a quantity to affect satisfactory operation of the device or safety.
6
Dust-proof No ingress of dust.
0
Not protected
1
Protected against dripping water Vertically falling drip water must not have a harmful effect.
2
Protected against dripping water Vertically falling drip water must not have a harmful effect when the housing is in-
clined at up to 15° from the vertical to either side.
3
Protected against water spray Water sprayed on both sides of the vertical at an angle of up to 60° must not have
a harmful effect.
4
Protected against splash water Water spray from a hose which is directed on the enclosure must not have a harm-
ful effect.
5
Protected against water jets A water jet from a hose which is directed on the enclosure must not have a harmful
effect.
6
Protected against intense water jets An intense water jet from a hose which is directed on the enclosure must not have
a harmful effect.
7
Protected against harm from temporary submersion in
water
Water must not enter in quantities that can cause damage when the casing is tem-
porarily submerged in water under standardized pressure and time conditions.
8
Protected against harm from long-term submersion in
water
Water must not enter in quantities that can cause damage when the casing is sub-
merged in water for a long time. The conditions must be agreed between the ma-
nufacturer and the user. The conditions must, however, be more severe than for 7.
9
Protected against water from high-pressure hoses and
steam cleaning
Water directed at extremely high pressure onto the enclosure from all directions
must not result in harmful effects.
Protection against the ingress of solid bodies
Protection against the ingress of water
© Siemens AG 2007