Brochure/Catalogue

for EMR for SSR
Relay times (time response)
electromechanical relays
Because of the self-inductance of the coil and the inertia of the moving parts, the
steps involved in operating a relay do not occur instantaneously. The following
chart illustrates several time-function terms for the main contact variants of non-
delayed switching relays.
Rest position
Switch-on delay
Coil voltage
Position of the
moving parts
Voltage at
NO contact
Voltage at
NC contact
Working position
Switch-off delay
Rest position
Open
Closed
Closed
Open
Bounce time
Switch-on
delay
Switch-off
delay
Time
x
Repeat accuracy Difference between the highest and lowest time range values for several
measurements of a timing relay’s time response under identical conditions. The
value is given as a percentage of the mean value of all measured values.
x x
Rest position The switched position of a mono-stable relay in its de-energized state. x
RoHS Directive RoHS stands for “Restriction of (the use of certain) Hazardous Substances”.
According to the EU Directive 2002/95/EC from 01.07.2006, all EU member
nations must forbid the use of hazardous substances which damage human
health and the environment (including mercury (Hg), cadmium (Cd), lead (Pb),
hexavalent chrome (Cr6), polybrominated biphenyls (PBB) and polybrominated
diphenyl ethers (PBDE)) in new electrical and electronic devices.
The term “compliant” means that the entire product group meets the
requirements of the RoHS Directive.
x x
EMR = Electromechanical relay
SSR = Solid-state relay
W
Technical appendix/Glossary
W.34 2737920000
Glossary: Relay modules and Solid-state relays