MSO-0008P-012 NCC, MSO-0008P-012 Datasheet - Page 110

• Manufacturer Part Number: MSO-0008P-012
• Description: Socket, Relay; 8 Pin Octal
• Manufacturer: NCC
• Type: Octalr

Specifications of MSO-0008P-012

• Number Of Contacts: 8
• Time Range: 0.05 Sec. to 999 Min.
• Output Rating: 10 A @ 240 VAC Max.; 100 mA @ 5 VDC Min.
• Operating Temperature: –23°C to +55°C

AMETEK National Controls Corp. • 1725 Western Drive • West Chicago, Illinois 60185 • Tel: [phone] • 630-231-5900 • FAX: [phone] • www.nationalcontrols.com
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Heat Dissipation Because all electrical
devices offer resistance to the flow of cur-
rent, heat is generated when current flows
through this resistance. This undesired
heating effect is a function of the device
resistance and the amount of current flow-
ing through it. Heat sinks are used to cool
high current devices, thereby dissipating
the heat generated.
Heat Sink A device which possesses low
thermal resistance in order to effectively
absorb and dissipate heat.
Heat Sink Compound A compound
used to assure good thermal connection
between a heat dissipating device and a
heat sink.
Hertz A unit of frequency named after
Heinrich R. Hertz (1857-1894) which is
equal to one cycle per second.
Holding Current In solid state switch-
ing devices there is a point at which the
current flow is insufficient to maintain con-
duction. Holding current is specified as
the minimum current through the device,
across the operating temperature range,
that will maintain conduction.
Horsepower (hp) A unit of power in the
U.S. Customary System, equal to 745.7
watts or 33,000 foot-pounds per minute.
Electrical motors are rated in horsepower,
so accordingly, devices designed to con-
trol motors are also rated in horsepower.
Humidity Water vapor content in the
air. In percent Relative Humidity, it is a
measurement of the actual water vapor
content of a unit volume relative to what
the maximum amount of water vapor the
same volume can contain at a given tem-
perature.
Hysteresis The failure of a property that
has been changed by an outside force to
return to its original value when the cause
of the change is removed. Some hyster-
esis is designed into controller circuits
because it prevents noise from causing
false triggering.
Incandescent Load From a switching
perspective, the incandescent load repre-
sents an initial inrush current of up to 10
times the steady state rating.
GLOSSARY
Inductive Load An inductive load
opposes any change to circuit current.
Devices such as motors, solenoids, relay
coils, valves, and contactor coils are all
inherently inductive loads. The current
waveform is always lagging the voltage
waveform in an inductive load; because
of the phenomena, certain factors must
be taken into account when working with
this type of load. An inductive load can
exhibit an inrush current of up to 5 times
its normal running or steady state current
when energized. When power is removed
from the inductive load, high voltage tran-
sients are generated due to the collapsing
magnetic field, and this can cause arcing
across contacts or a malfunction, and/or
damage to electronic circuits.
Initiate Time (Start Time) The minimum
time of a switch closure or voltage pulse
applied to a start switch input of a control-
ler which will activate the control function.
Input Voltage The voltage source applied
to the controller input terminals which is
used to power the controller while it is
performing its function.
Inrush Current The peak value of cur-
rent which a load requires when first being
energized. Certain types of loads (e.g.,
lamps, motors) will draw a larger initial
current because their impedance is lower
at startup than during steady state opera-
tion.
Isolation No electrical connection
between two or more circuits.
Insulation Resistance The degree of
non-conductance of an insulator, mea-
sured in Megohms.
Insulator A material that insulates, partic-
ularly a nonconductor of electricity, heat,
or sound.
Interval A period of time between events.
Kilohm One thousand ohms (1,000 or 1
K ohms).
Leakage Current The maximum current
which a solid state device still conducts
when in the OFF state. Leakage current is
usually measured in milliamperes (mA).
LED Light Emitting Diode, used in infor-
mation displays and as status indicators.
Life A specific number of operations or
amount of time during which a particular
device is expected to operated reliably.
Line Frequency Frequency of electrical
service provided by local utility, typically 50
or 60 Hertz.
Line Voltage Initiation The initiation of a
control function by application of line volt-
age to either the controller’s input termi-
nals or start switch terminals.
Line Voltage Nominal voltage of electric
service provided by local utility, typically
120 or 240 VAC.
Load Any device which consumes power
to do work.
Load Rating A specification of the out-
put capability of a particular controller.
Typically parameters for load rating are:
controllable current range, maximum AC
and/or DC voltage, horsepower or Power
Factor and maximum inrush current.
Lock Shaft (Locking Bushing) A
mechanical means to inhibit further adjust-
ment of a rotary type device such as a
potentiometer.
Low Voltage Voltage which is typically
less than 30 Vrms.
Magnal Plug A circular, 11-pin male con-
nector with an indexing key for proper
orientation in the mating socket.
Make A term used to denote the action of
completing an electrical circuit.
Metal Oxide Varistor (MOV) A device
whose impedance decreases dramatically
when subjected to voltages greater than
the rated clamping voltage. It is typically
placed in parallel with the input and/or
output of a switching device to effectively
clamp transient voltage spikes to a certain
level.
Megohm One million ohms (1,000,000 or
1Meg ohms).
Micro A metric prefix which is used to
multiply a standard unit by 10
Milli A metric prefix which is used to mul-
tiply a standard unit by 10
Milliamperes One-one thousandth of an
ampere (.001 or 10
-3
ampere).
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