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60
5 5
Limit switches
OsiSense XC
General
Reminder of the standards
The majority of Schneider Electric products comply to national standards (for example French NF C standards, German DIN standards), European
standards (for example CENELEC) or international standards (for example IEC). These standards rigidly stipulate the characteristic requirements of
the designated products (for example IEC 60947 relating to low voltage switchgear and control gear).
These products, when correctly used, enable the production of control equipment assemblies, machine control equipment or installations
conforming to their own specic standards (for example IEC 60204 for the electrical equipment of industrial machines).
IEC 60947-5-1
Insulation coordination (and dielectric strength) b The standard IEC 60664 denes 4 categories of prospective transient overvoltages. It is
important for the user to select control circuit components which are able to withstand these
overvoltages. To these ends, the manufacturer states the rated impulse withstand voltage
(U imp) applicable to the product.
Terminal connections b The cabling capacity, mechanical robustness and durability of the terminals, as well as
the ability to resist loosening, are veried by standardised tests.
b Terminal reference marking conforms to standard IEC 60947-5-1 Appendix M .
Switching capacity b With maximum electrical load. A single designation (A300 for example) enables indication
of the contact block characteristics related to its utilisation category.
Positive opening operation (IEC 60947-5-1 Appendix K) b For contacts used in safety applications (end of travel, emergency stop device, etc.)
the assurance of positive opening is required (see IEC 60204, EN 60204) after each test,
the opening of the contact being veried by testing with an impulse voltage (2500 V).
Electrical symbols for contacts b Form Za,
the 2 contacts
(NO + NC) are the
same polarity.
b Form Zb,
the 2 contacts (NO + NC) are electrically
separate.
Symbol for positive opening
b Simplied version
b Complete
symbol
CENELEC EN 50047
The European standards organisation CENELEC, which has 14 member countries, has dened in this standard the rst type of limit switch.
It denes 4 variants of devices (forms A, B, C, E).
Limit switches XCKP, XCKD and XCKT conform to
standard EN 50047.
(1) Minimum value
(2) Maximum value
A: reference axis
H: dierential travel
P: tripping point
E: cable entry
Form A, with roller lever Form B, with end plunger (rounded)
30 (2)
12,5 (1)
50 (2)
5 (1)
10 (1)
E
20 (1)
31 (2)
55
H
A
55 (2)
40
P
12,5
21 (1)
H
15 (1)
P
Form C, with end roller plunger Form E, with roller lever for 1 direction of actuation
2,5 (1)
10 (1)
25 (1)
31 (1)
H
P
H
35
P
25
20 (1)
28
H
40
30 (2)
P
20 (1)
5 (1)
10 (1)
12,5
10 2
Reminder of the standards