Brochure/Catalogue

for EMR for SSR
Type of insulation Quality of the insulation system, depending on the design and
application conditions:
• Functional insulation: insulation between live components – necessary so the
relay functions properly.
• Basic insulation: insulation of live parts to provide basic protection against
electrical shock.
• Doubled insulation: consisting of a base insulation and additional insulation.
• Reinforced insulation: a single “enhanced“ insulation of active components,
which ensures the same protection against electric shock as doubled
insulation. The doubled insulation is composed of a base insulation and an
additional insulation; the extra insulation protects against electric shock if the
basic insulation fails.
x x
U
Utilisation category
according to EN 60947
(mechanical relays)
The contactor standard EN 60947 divides loads into different utilisation
categories, thereby making it possible to determine service life values for various
applications. This standard is also partly applied to relays. However, users must
be aware that even these values are only of limited practical use, as the test
loads are often highly inductive and are operated without a protective circuit.
More precise information on switching capacity and service life can be made on
the basis of concrete application data.
Explanation of the most important common categories for relay modules:
AC1: Non-inductive or only weakly inductive load, e.g. heating elements
AC14: Small electromagnetic loads (<72VA), e.g. small contactors
AC15: Electromagnetic loads (>72VA), e.g. power contactors
DC1: Non-inductive or only weakly inductive load, e.g. heating elements
DC13: electromagnetic loads, e.g. solenoid valves
x
V
Voltage drop at max. load Voltage drop across the switched output of the solid-state relay, when measured
under full load.
This is due to the fact that semiconductor switches do not become as low-
resistance as electromechanical switches.
Therefore, when switched, they have more power loss compared to
electromechanical relays.
x
EMR = Electromechanical relay
SSR = Solid-state relay
W
Technical appendix/Glossary
W.40 2737920000
Glossary: Relay modules and Solid-state relays