SCHRACK
Definitions
Definitions
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page
Processing information . . . . . . . . . . . . . . . . . . . . . . . . . .page
Application information . . . . . . . . . . . . . . . . . . . . . . . . . .page
Safety Relays / Definitions . . . . . . . . . . . . . . . . . . . . . . .page
2
13
14
15
Definitions
Rev. HI1
Issued 2008/09
www.tycoelectronics.com
www.schrackrelays.com
Dimensions are in mm unless
otherwise specified and are
shown for reference purposes
only.
Product data, technical para-
meters, test conditions and
processing information
according to IEC 61810-1
and as specified in this
‘Definitions’ section or at
schrackrelays.com in the
‘Schrack’ section.
Definitions and specifications
subject to change.
General Purpose Relays
SCHRACK
Definitions
Technical data
Unless otherwise stated, the stated technical data are based on
laboratory tests under standardized conditions and are within the
conditions of normal use for these components. The vast number
of influencing factors does not allow to test our products for all
imaginable applications and processes. Furthermore, the large
number of possible variations within a relay family makes it
impossible to give a comprehensive description of the different
characteristics for all variants in one datasheet. Typical data
should be derived from the standard versions.
The decision on the suitability of a specific component is the
solely responsibility of the user. To ensure the suitability of the
product for a specific application the user has to test these
products before the use under the most stringent conditions they
will be exposed to in the actual application. Taking into
consideration the functionality and safety, the user has to rate the
actual service life in relation to the expected life of the relay.
The use of the relay beyond its specified characteristics or tested
life expectancy carries the risk of dangerous conditions; the user
has to prevent such conditions by adequate measures.
All product data are intended for users with knowledge and
experience in the application of such specifications. The utilization
is at the risk of the user.
The user has to verify the accordance with existing regulations
and relevant standards for the application; in particular with
reference to the insulation requirements as function of applied
voltages and ambient conditions.
The standards are based on the principal assumption of heating
effects and risk of fire in case electrical currents >0.2A or >0.5A
being conducted and switched. Our relays are manufactured with
self extinguishing plastics corresponding to the up-to-date
technology and standards requirements. Protection against
excessive heat and possible spread of fire under all operation
conditions even in case of malfunction can only be ensured by
the design of the equipment as well as by application instructions
for the end user; it is the responsibility of the manufacturer of the
equipment to take the appropriate measures.
Specification
In order to improve the performance and quality we continuously
develop our products. We reserve the right to change technical
parameters and product specification without prior notice. With
the technical data listed are for description purposes of the
components only and are not an agreement and do not guarantee
specific characteristics and parameters; for detailed questions
please contact our application support. Drawings, photos data
and descriptions are subject to change without prior notice.
Availability
The ordering code structure does allow a large number of
possible variantions, but not all possible variations are defined as
standard types in the current product portfolio (ordering codes)
and thus may not be included in the product range. Special
versions to customer specifications can be supplied. Please
contact your local sales organisation.
Right to change the availability and delivery conditions reserved.
AC
Pertaining to alternating quantities such as voltage or current, to
devices operated with these, or to quantities associated with
these devices. If not otherwise stated the indicated data is given
for 50 Hz.
AC-coil
Relays for direct energization with AC supply. If not otherwise
stated the data is given for 50 Hz supply.
Adjacent contact circuits
Insulation parameters between two adjacent contact circuits,
which do not have a conductive connection. The level of
insulation depends on the design and rated voltage.
Ambient temperature
The temperature in the vicinity of the relay (distance according to
IEC 61810-1).The minimum ambient temperature is the miniumum
operating temperature, the maximum ambient temperature is the
maximum operating temperature for the use of the relay or
accessory. This temperature range should not be exceeded.
Ambient temperature range according to IEC 61810-1 and
indicated in °C.
Approvals
With the approval label the independent approval agency and/or
test house confirms the compliance with the relevant product
standards and/or certain product characteristics.
NOTE: the ordering code structure does allow a large number of
possible variations, but not all variations are defined as standard
types (ordering codes) and thus some relays may not be included
in the list of approved relays. Technical data and approved types
on request.
B
BEAB British Electrotechnical Approvals Board,
England
CSA
Canadian Standards Association, Kanada
C
Danmarks
D
DEMKO Dänemark Elektriske Materielkontrol,
Naamloze Vennootschap tot Keuring van
H
KEMA Electrotechnische Materialien, Niederlande
L
LLOYD’s Lloyd’s Register of Shipping
Norges Elektriske Materiellkontroll,
N
NEMKO Norwegen
Österreichischer Verband
O
ÖVE Elektrotechnik, Österreich für
Svenska Elektriska
S
SEMKO Materiellkontrollanstalten AB, Schweden
Sähkötarkastuskeskus
F
FIMKO Elinspektionscentralen, Finnland
Eidgenössisches Starkstrominspektorat,
s
SEV Schweiz
Technischer
T
TÜV DeutschlandÜberwachungs-Verein,
Underwriters Laboratories,
U
UL UL Component RecognitionInc., USA;the
Mark for
United States
z
UL UL Component Recognition Mark for Canada
UL Component Recognition
Z
UL United States and Canada Mark for the
VDE-Prüfstelle, Deutschland
V
VDE mit Fertigungsüberwachung)(Gutachten
2
Definitions
Rev. HI1
Issued 2008/09
www.tycoelectronics.com
www.schrackrelays.com
Dimensions are in mm unless
otherwise specified and are
shown for reference purposes
only.
Product data, technical para-
meters, test conditions and
processing information
according to IEC 61810-1
and as specified in this
‘Definitions’ section or at
schrackrelays.com in the
‘Schrack’ section.
Definitions and specifications
subject to change.
General Purpose Relays
SCHRACK
Definitions
(Continued)
Basic insulation
Insulation applied to live parts to provide basic protection against
electric shock.
Bifurcated contact
Contact with two simultaneously operating contact points.
Bifurcated contacts increase the contact reliability considerably,
especially when switching low currents and voltages (dry circuits).
Bistable Relay, switching characteristics
In a bistable relay, the contacts remain in the last switching
position after the input voltage is disconnected.
Bistable, polarized relay
A polarized bistable relay adopts one switching position on
energizing in a particular direction and the other switching
position when the energizing is in the opposite direction. In a
bistable relay with one winding, the opposite energizing is created
by a voltage with opposite polarity being applied to the same
winding.
In a bistable relay with two windings, the opposing energizing is
created by a voltage being applied to the second winding with
opposite winding sense.
Bistable, remanent relay (remanence relay)
A remanent, bistable relay which adopts a particular switching
position following an energizing direct current in any direction and
is then held in this position by the remanence in the magnetic
circuit, i.e. through the magnetization of parts of the magnetic
circuit. The contacts return to their original position following a
small energizing current of limited amplitude of the opposite
polarity. This demagnetises the magnetic circuit.
Bounce
An unintentional phenomenon that can occur during the making
or breaking of a contact circuit when the contact elements touch
successively and separate again before they have reached their
final position.
Bounce time
The time from the first to the last closing or opening of a relay
contact. Unless otherwise stated the indicated times are
maximum values and are for energization with rated voltage,
without any components in series or parallel to the coil, and at
reference temperature.
Break contact
See > NC contact
Bridging contact
Compound contact with two simultaneously operating contacts
connected in series by the design of the relay.
Category of protection (IEC 61810)
The ´Relay Technology Categories´ (IEC 61810) describe the
degree of sealing of the relay case or its contact unit:
RT 0:
RT I:
RT II:
unenclosed relay
Relay not provided with a protective case
dust protected relay
Relay provided with a case which protects its mechanism
from dust
flux proof relay
Relay capable of being automatically soldered without
allowing the migration of solder fluxes beyond the
intended areas. These are the contacts, movable parts of
the magnetic system and their immediate environment.
RT III:
wash tight (washable) relay
Relay capable of being automatically soldered and
subsequently undergoing a washing process to remove
flux residues without allowing the ingress of flux or
washing solvents.
The test to evaluate the sealing of the case for wash tight
relays is performed according to the IEC 60068-2-17, Qc
test.
NOTE - Please refer to the ‘Processing’ section for
additional information.
In service this type of relay is sometimes vented to the
atmosphere after soldering or washing process; in this
case the requirements with respect to clearances and
creepage distances can change.
RT IV:
RT V:
sealed relay
hermetically sealed relay
Change-over contact
See > CO contact
Clearance distance
Shortest distance in air between two conductive parts or between
a conductive part and the accessible surface of the relay.
CO contact
Compound contact consisting of a NO (make) contact and a NC
(break) contact with a common terminal. On changing the switch
position, the contact previously closed opens first followed by the
closing of the contact that was previously open.
Note: in case of a switching arc the NO and NC contact may be
temporarily electrically connected.
Coil data
The coil data is specified according to IEC 61810-1.
Unless otherwise indicated the data is given for ambient
temperature 23°C, coil temperature equal to ambient temperature
(cold coil, without preenergization), 50 Hz for AC supply,
individual mounting of relays.
Indicated data for the operative range class, is given for the
minimum allowed mounting distance.
A duty factor of 100% (permanently operated) is permissible.
Coil insulation system according to UL1446
These requirements cover test procedures to be used in the
evaluation of electrical insulation systems intended for connection
to branch circuits rated 600 volts or less. This standard refers to
insulation systems and does not cover individual insulating
materials.
Coil operatve range
Admissible range of energizing voltage with respect to the
ambient temperature. The upper limit is the maximum coil voltage,
the lower limit is the operate voltage U
min
(coil without
preenergization) and/or the operate voltage U
1
(preenergized
coil). The diagrams are valid for individual mounting of relays
without thermal interference and connection wiring according to
IEC 61810-1, table 12. The use of a relay with an energising
voltage other than the rated coil voltage may lead to reduced
electrical life. In case the application requires an energization with
other than the rated coil voltage, the coil voltage should be within
the recommended voltage range (shaded area) to keep the
influence on electrical life to a minimum.
3
Definitions
Rev. HI1
Issued 2008/09
www.tycoelectronics.com
www.schrackrelays.com
Dimensions are in mm unless
otherwise specified and are
shown for reference purposes
only.
Product data, technical para-
meters, test conditions and
processing information
according to IEC 61810-1
and as specified in this
‘Definitions’ section or at
schrackrelays.com in the
‘Schrack’ section.
Definitions and specifications
subject to change.
General Purpose Relays
SCHRACK
Definitions
(Continued)
curve 1: operate- / minimal voltage U
0
(without preenergization)
curve 2: operate- / minimal voltage U
1
(preenergized coil)
curve 3: maximum voltage at contact current = 0 A
curve 4: limiting voltage U
2
at rated contact current I
rated
recommended voltage range (shaded area):
the coil voltage should be within the recommended
voltage range to minimise any adverse effects on
electrical life
Contact configuration
According to the different switching functions of the relay
contacts, the various contact configurations, design and
description are specified:
I
NO contact
I
NC contact
I
CO contact
I
Bridging contact
Coil operative range for bistable relays
curve 1: operate voltage at coil temperature equal to ambient
temperature
curve 2: minimum reset voltage
curve 3: maximum operate voltage
curve 4: maximum reset voltage
For bistable relays, all curves are given for pulse
energization (short energization duration)
Contact current
Electrical current which a relay contact carries before opening or
after closing (rated current of the load).
Contact gap
Shortest distance between the open contact points.
Contact loading / schematic for contact loading
Single-pole contact
Double-pole contact
Coil power
Power consumption of the coil at rated coil voltage and coil
resistance, given as rated power.
Coil resistance
Electrical resistance of the relay coil at reference temperature.
Coil-contact circuit data
Insulation parameters between the coil system and the contact
circuit/system.
Contact bounce
See > Bounce
4
Definitions
Rev. HI1
Issued 2008/09
www.tycoelectronics.com
www.schrackrelays.com
Dimensions are in mm unless
otherwise specified and are
shown for reference purposes
only.
Product data, technical para-
meters, test conditions and
processing information
according to IEC 61810-1
and as specified in this
‘Definitions’ section or at
schrackrelays.com in the
‘Schrack’ section.
Definitions and specifications
subject to change.
General Purpose Relays
SCHRACK
Definitions
(Continued)
Multi-pole contact
Change-over contact
higher contact resistance than AgNi0.15
circuits with medium to high loads, DC- and AC-circuits,
recommended range of application
W
12 V, 10 mA
Fine-grain silver AgNi0.15
I
relatively low contact resistance, low resistance against
aggressive atmosphere
I
universally applicable in medium and low load range,
especially in DC-circuits, recommended range of application
W
12 V, 10 mA
Silver-Tin-Oxide AgSnO
2
I
low welding tendency, high wear resistivity with heavy loads,
low material transfer
I
circuits with high requirements to make- and break currents,
DC- and AC loads, recommended range of application
W
12
V, 100 mA
Tungsten W
I
highest melting point, for high switching rates and low ON-
time
I
as prerun contact in circuits with highest make loads
Silver-Cadmium-Oxide AgCdO
I
compliant with RoHS directive (Directive 2002/95/EC) only
under time limited exception, therefore not recommended for
new designs
I
low welding tendency, high wear resistance
I
for switching of inductive loads, AC-circuits,
W
12 V, 100 mA
I
Contact ratings
See > Electrical Endurance
Contact resistance
Electrical resistance between the relay terminals of a closed
contact, measured with indicated measuring current and
indicated source voltage. The specified contact resistance is
reached reliably only above a particular load. Considerably
increased contact resistances can occur with smaller loads.
After a prolonged period of a steady state operate/release
position or storage of the relay a certain number of cycles are
recommended before measurement of the contact resistance.
According to IEC 61810-7 the following measurement parameters
are applied (for general purpose relays category CC2 is
applicable):
Category
CC0
CC1
CC2
Contact material
The list gives an overview of the most important plating- and
contact materials. The switching capacity of the contacts and the
respective electrical endurance depends not only on the contact
material but also to a high degree on the relay design. Decisive
for the application therefore is the optimal combination of the
mechanical system and the contact material. The characteristics
for certain relay types cannot be transferred to other designs,
neither can these values be used as given limits for existing
products.
1) Plating materials:
Gold
I
best corrosion resistance, not used as solid material because
too soft, high tendency towards cold-welding
I
gold platings
w1
μm (hv), only as storage protection, no
protection against aggressive atmosphere.
Hard gold plated (htv)
I
very good corrosion resistance, low and stable contact
resistance at lowest loads, low tendency to cold welding
I
dry-circuit switching (switching without current/voltage),
recommended range of application
W
1 V, 1 mA, 50 mW
Load
V
A
0.03
0.01
without electrical arc
with electrical arc
Measurement
V
A
0.03
0.01
10
0.1
30
1
Contact set
See
I
bridging contact
I
forcibly guided contact
I
pre-make contact
I
single contact
I
twin/bifurcated contact
Contact terminations (insulation)
Insulation parameters of the contact. In case of a micro-
disconnection/functional insulation the clearance/creepage data
reflect the outside of the relay, there are no dimensional
requirements for the internal design of the contact system.
Contact terms
2) Contact materials:
Silver-Nickel AgNi90/10
I
high resistance against electrical wear, low welding tendency,
5
Definitions
Rev. HI1
Issued 2008/09
www.tycoelectronics.com
www.schrackrelays.com
Dimensions are in mm unless
otherwise specified and are
shown for reference purposes
only.
Product data, technical para-
meters, test conditions and
processing information
according to IEC 61810-1
and as specified in this
‘Definitions’ section or at
schrackrelays.com in the
‘Schrack’ section.
Definitions and specifications
subject to change.
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