Brochure/Catalogue

for EMR for SSR
Switching cycle Describes the cycle of the switching state of response/switch-on and subsequent
reset/switch-off of a relay or solid-state relay.
x x
Switching voltage AC max.
Switching voltage DC max.
Maximum permissible voltage with the standard mains tolerances between the
switching contacts before closing and after opening a relay contact.
x
T
Time ranges List of the different adjustable time ranges of a timing relay.
Mostly adjustable via rotary switch or dip switch.
x x
Timing relay,
multifunction timing relay
Electromechanical relay modules or solid-state relays that can switch with a time
delay thanks to a time switch in the control input.
Some timing relays can perform different time functions, which is why they are
called multifunction timing relays.
x x
Type code The type code explains the composition of the article designation (type
name). It allows for a large number of possible variations, but not all possible
combinations can be found in the current product line, as some combinations
cannot be implemented or some variants may be discontinued. Special versions
are available on request to meet customer specications.
x x
Type of contact The following contact arrangements are specied and described:
• NO contact: Contact which is closed in the relay’s operating position and open
in its rest position.
• NC contact: Contact which is closed in the relay’s rest position and open in its
operating position.
• CO contact: Contact consisting of an NO contact and an NC contact with
a common connection (root). When changing the switch position, rst the
previously closed contact opens and then the previously opened contact
closes.
The following table shows the different designations for the contacts:
Short
description
NARM
designator
Circuit
symbol
Make contact NO SPST-NO
Break contact NC SPST-NC
Changeover
contact
CO SPDT
For multiple contact relays, the contacts are
designated as in the following examples:
Multiple pole
congurations
Short
description
NARM
designator
Circuit
symbol
2Make
contacts
2 NO DPST-NO
3Break
contacts
3 NC 3PST-NC
4Changeover
contacts
4 CO 4PDT
Abbreviations: NO: normally open; NC: normally closed; CO: changeover;
SPST: single pole, single throw; SPDT: single pole, double throw; DPST: double pole, single throw
x x
EMR = Electromechanical relay
SSR = Solid-state relay
W
Technical appendix/Glossary
W.392737920000
Glossary: Relay modules and Solid-state relays