Northern Connectors Harting HAN Industrial Rectangular Connectors - Manual (Page 32)

Han
00
.
26
➀
Han D ® I
N
= 10 A
➁ Han ® 3 A / 4 A I
N
= 10 A
➂ Han A ® / Han E ® , Han ® ES, EE, Q 5/0 I
N
= 16 A
➃ Han ® 6 HsB I
N
= 35 A
➄
Han ® C/K axial I
N
= 40 A
➅ Han ® K 4/8 I
N
= 80 A
➆ Han ® K 6/6 I
N
= 100 A
➇ Han ® K 3/0 I
N
= 200 A
➈ Han ® HC-Modular 350 I
N
= 350 A
➉ Han ® HC-Modular 650 I
N
= 650 A
5 V
5 mA
Current carrying capacity
Transient current carrying capacity
A transient current in circuits can be generated by switching
operations such as the starting of a motor or a short circuit in a
faulty installation. This can cause thermal stress at the contact.
These short and very high increases cannot be dissipated quickly
and therefore a local heating effect at the contact is the result.
Contact design is an important feature when transient currents are
encountered. HARTING contacts are machined from solid material
and are therefore relatively unaffected by short overloads when
compared to stamped and formed designs. For guidance please
see the table below.
Short circuit carrying capacity
Low currents and voltages
HARTING’s standard contacts have a silver plated surface. This
precious metal has excellent conductive properties. In the course
of a contact’s lifetime, the silver surface generates a black oxide
layer due to its affinity to sulphur. This layer is smooth and very
thin and is partly interrupted when the contacts are mated and
unmated, thus guaranteeing very low contact resistances. In
the case of very low currents or voltages small changes to the
transmitted signal may be encountered. This is illustrated below
where an artifically aged contact representing a twenty year life is
compared with a new contact.
In systems where such a change to the transmitted signal could
lead to faulty functions and also in extremely aggressive environ-
ments, HARTING recommend the use of gold plated contacts.
Below is a table derived from actual experiences.
Recommendation
Changes to the transmitted signal after artifical ageing
➀
new contact
➁ after ageing
5 V
5 mA
Gold
Silver