Brochure

11
Technical Information – Relays
SINGLE-SIDE STABLE RELAYS (STANDARD)
The contacts of this simple type of relay momentarily turn ON and
OFF, depending on the excitement state of the coil.
DOUBLE-WINDING, LATCHING RELAYS
This latching relay has two coils: set and reset. It can retain the
ON or OFF states even when a pulsating voltage is supplied, or
when the voltage is removed.
SINGLE-WINDING, LATCHING RELAYS
Unlike the double-winding latching relay, the single-winding
latching relay has only one coil. This coil, however, serves as both
the set and reset coils, depending on the polarity (direction) of
current flow. When current flows through the coil in the forward
direction, it functions as a set coil; when current flows through the
coil in the reverse direction, it functions as a reset coil.
BUILT-IN DIODE
A diode is built into some relays, wired in parallel with the coil to
absorb the counterelectromotive force (counter emf) generated by
the coil.
BUILT-IN OPERATION INDICATOR
Some relays are provided with a light-emitting diode (LED), wired
in parallel with the coil. This permits a fast–check of the relay’s
operating status.
■
Operation
Classification Fully Sealed Surface Mounting
Construction
Automatic flux application Good Good
Automatic soldering Good Good
Automatic cleaning Good Good
Manual soldering Good Good
Penetration of dust Good Good
Penetration of Good Good
corrosive gas
Resin seal
Glue pad
Resin seal
Press-fit terminals
Terminals are separated from PCB surface
when relay is mounted.
Features Terminal and base, as well as the base and
casing, are sealed with adhesive; the L-shaped
terminals and adhesive pads allow temporary
fixing to the board.
Terminal Arrangement/
Internal Connections
(Bottom View)
Mounting ori
entation mark
Terminal Arrangement/
Internal Connections
(Bottom View)
Mounting ori
entation mark
S: Set coil
R: Reset coil
SR
Terminal Arrangement/
Internal Connections
(Bottom View)
Mounting ori
entation mark
S: Set coil
R: Reset coil
S R
PCB Relays
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 11