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NC
SAFETY STANDARDS
Product name
File No.
UL/C-UL (Recognized)
Contact rating
File No.
CSA (Certi?ed)
Contact rating
2 Form C
E43028
5A 250V AC
1 / 10 HP 125, 250V AC
5A 30V DC
LR26550
etc.
5A 250V AC
1 / 10 HP 125, 250V AC
5A 30V DC
NC
4 Form C
E43028
5A 125V AC
4A 250V AC
1 / 10 HP 125, 250V AC
LR26550
etc.
5A 125V AC
4A 250V AC
1 / 10 HP 125, 250V AC
5A 30V DC
5A 30V DC
2 Form C
E43028
3A 250V AC
1 / 20 HP 125, 250V AC
LR26550
etc.
3A 250V AC
1 / 20 HP 125, 250V AC
NC Amber
4 Form C
E43028
5A 30V DC
2A 250V AC
1 / 20 HP 125, 250V AC
LR26550
etc.
5A 30V DC
2A 250V AC
1 / 20 HP 125, 250V AC
NOTES
5A 30V DC
5A 30V DC
1. Because the NC relay is polarized, the
positive “+” and negative “–” connections
to the coil should be done as indicated on
the wiring diagram. If connected
incorrectly, it may malfunction or fail to
operate.
2. While NC relays can be used with any
transmission-wave current to their
5. When designing top and bottom view
schematic diagrams, note that:
1) “Top view” wiring diagram is indicated
for the ?at series because terminals can
be seen from above.
2) “Bottom view” schematic diagram is
indicated for the vertical series because
terminals cannot be seen from above.
6. Cautions for close proximity mounting
When using slim series in close proximity,
mount all relays facing the same
direction. Different mounting directions
may cause change in the relay
characteristics because NC relays are
polarized.
operation, due to slight weakening of the
force of magnetic attraction, decreased
resistance to vibration and shock should
be taken into account.
3. The current that energizes the coil in
an NC relay is AC type. Because the AC
sine waveform is distorted, when testing,
it is essential to use a measuring device
that can properly characterize the
distorted waveform.
The operating power of the coil in the 100
V AC 4 Form C type is relatively higher
than other NC types of AC relay and
consequently, the total current applied
through all the contacts should be kept
below 10 A.
4. The AC type NC relay has a special
magnetic design. As a result, once the a-
side contacts have switched, the b-side
contacts may once again go into a
temporary ON state depending on the
coil inrush phase. To ensure that this
phenomenon does not occur, it is
necessary to carry out suf?cient practical
testing with relays installed in actual
devices.
For Cautions for Use.
Top view
Flat series
(Same direction)
Vertical series
Bottom view
ASCTB12E 20120 9 -T
Panasonic Corporation
Automation Controls Business Unit
industrial.panasonic.com/ac/e/
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