D4BL-3CRB-A Omron, D4BL-3CRB-A Datasheet - Page 19

• Manufacturer Part Number: D4BL-3CRB-A
• Description: Contact OSTI For Purchase
• Manufacturer: Omron
• Series: D4BLr

Specifications of D4BL-3CRB-A

• Contact Configuration: DPST-1NC / 1NO + SPST-NC
• Contact Voltage Ac Max: 250V
• Contact Current Ac Max: 10A
• Switch Operation: ON
• Switch Terminals: Screw
• Contact Current Max: 10A
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

■ Precautions for Correct Use
Switch Operation
• The Switch in actual operation may cause accidents that cannot be
• When testing the Switch, be sure to apply the actual load
• All the performance ratings in this catalog are provided under the
Inductive load: A minimum power factor of 0.4 (AC) or a
maximum time constant of 7 ms (DC)
Lamp load: An inrush current 10 times higher than the
normal current
Motor load: An inrush current 6 times higher than the
normal current
Note: An inductive load causes a problem especially in DC circuitry.
Mechanical Conditions for Switch
Selection
• An Actuator suitable for the operating method must be selected.
• Check the operating speed and switching frequency.
• Do not impose excessive force on the Actuator, otherwise the
• Make sure that the stroke is set within the suitable range specified
Electrical Characteristics for Switch
Selection
Electrical Conditions
• The switching load capacity of the Switch greatly varies between
foreseen from the design stage. Therefore, the Switch must be
practically tested before actual use.
conditions together with the actual operating environment.
following conditions unless otherwise specified.
Ask your OMRON representative for details.
Actuator may become damaged or not operate correctly.
for the model, or otherwise the Switch may break.
AC and DC. Always be sure to apply the rated load. The control
capacity will drastically drop if it is a DC load. This is because a DC
load has no current zero-cross point, unlike an AC load. Therefore,
if an arc is generated, it may continue comparatively for a long time.
Furthermore, the current direction is always the same, which
1. Ambient temperature: 5 ° C to 35 ° C
2. Ambient humidity:
1. If the operating speed is extremely low, switching of the
2. If the operating speed is extremely high, the Switch may break
Therefore, it is essential to know the time constants (L/R) of the
load.
movable contact will become unstable, thus resulting in
incorrect contact or contact welding.
due to shock. If the switching frequency is high, the switching
of the contacts cannot keep up with the switching frequency.
Make sure that the switching frequency is within the rated
switching frequency.
http://www.ia.omron.com/
Solenoids
(Approximately 10 to 20 times higher)
Incandescent
lamps (Approximately 10 to 15 times
higher)
40% to 70%.
Motors
(Approximately
5 to 10 times
higher)
Relays
(Approxi-
mately 4 to 5
times higher)
• If the load is inductive, counter-electromotive voltage will be
• If the load is a minute voltage or current load, use a Switch
Connections
• With a Za contact form, do not contact a single Switch to two power
Power Connection Examples
Incorrect Power Connection Example
• Do not use a circuit that will short-circuit if a fault occurs, otherwise
• Application of Switch to a Low-voltage, Low-current Electronic
results in contact relocation, whereby the contacts easily stick to
each other and do not separate when the surfaces of the contacts
are uneven.
generated. The higher the voltage is, the higher the generated
energy will be, which will increase the abrasion of the contacts and
contact relocation load conditions. Be sure to use the Switch within
the rated conditions.
designed for minute loads. The reliability of silver-plated contacts,
which are used by standard Switches, will be insufficient if the load
is a minute voltage or current load.
supplies that are different in polarity or type.
the charged part may melt and break off.
Circuit
(Connection of Different Polarities)
(Connection of Different Power Supplies)
There is a risk of AC and DC mixing.
1. If bouncing or chattering of the contacts results and causes
2. Conventional silver-plated contacts are not suitable for this
3. The contacts of the Switch used for an emergency stop must
(c)Copyright OMRON Corporation 2007 All Rights Reserved.
(a) Insert an integral circuit.
(b) Suppress the generation of pulses from the contact
problems, take the following countermeasures.
application, in which particularly high reliability is required. Use
gold-plated contacts, which are ideal for handling minute
voltage or current loads.
be normally closed with a positive opening mechanism.
bouncing or chattering of the contacts so that it is less than
the noise margin of the load.
Connect the load to the same polarities.
Incorrect
Incorrect
Incorrect
Correct
AC
DC
L
NC
NO
NC
NO
NC
NO
NC
NO
L
L
NC
NO
L
C-4