Page 610 - Wago_Rail-MountedTerminalBlockSystems_Volume1_2015_US.pdf

14 Material Specification (continued)

608
Contact Materials

Hard and extra-hard electrolytic copper This material combines excellent conducti-
(E Cu) as well as extra-hard copper alloys vity and good chemical resistance wit-
are standard materials used for the cur- hout the risk of stress-induced cracking.
rent-carrying parts of all WAGO pro-
ducts.

Contact Plating

The special tin layer, which is the stan- The thick tin layer also ensures good sol-
dard layer for all current-carrying parts in derability of both PCB terminal block and
WAGO products, ensures perfect long- connector solder pins.
term protection against corrosive substan-
ces. Furthermore, these layers provide a
gas-tight contact that ensures a durable
transition resistance.

At the clamping unit, the conductor is
embedded into the soft tin layer via high
contact pressure. This protects the contact
area against corrosion.

Clamping Spring Material

All WAGO clamping springs are made Even after decades of use, no galvanic In certain product lines the clamping
of high-quality, accurately tested austeni- corrosion between the chrome nickel springs are thermally treated at tempera-
tic chrome nickel steel (CrNi) with high spring steel (in connection with the con- tures between 350°C (662°F) and
tensile strength, which boasts proven tact materials used by WAGO) and the 420°C (788°F) after production.
corrosion resistance through long-term connected copper conductors has been
usage. detected. This treatment reduces internal stress due
to the material‘s mechanical deformation,
It is resistant to salt sea air, city pollutants The relaxation of the material as a func- which may result in a slight brown disco-
and industrial emissions (e.g., sulfur dioxi- tion of time and surrounding temperatures loration of the spring surface.
de, hydrogen sulphide). up to 105°C (221°F) can be ignored.
Samples loaded with 500 N/mm at a WAGO only accepts deliveries of chro-
2
At room temperatures of approximately temperature of 250°C showed a relaxa- me nickel spring steel against certificates
20°C (68°F), the material is resistant to tion of only 1.5%. of conformity and after select material
salt solutions up to 30% and dilute phos- tests.
phoric acids up to 30%.