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CSI Section 16160
Siemens Electrical Products and Systems
Specification Guide
AC Controls
15
General
AC Controls
Pilot Device Units
Pilot Device Units and
Indicator Lights — Type 3SBO
Pilot Device Options
3SBO pilot devices are built by Siemens in
two basic forms - 1) as assembled for the
most frequently used configurations, or 2)
as subassemblies for greater flexibility.
Application
3SB0 devices are heavy duty oiltight,
watertight, and dusttight (NEMA Type 4,
4X, 13, IP65). They are used in industrial
control circuits at 600V or less. 3SBO
pilot devices are available in two diame-
ters, 7/8” and 1-13/64” (22 and 30 mm).
7/8” (22 mm) Mounting
The operator is inserted into the hole in
the panel from the front and twisted into
the contact block holder. The unit is then
fixed from behind by means of two set
screws which are located in the contact
block holder, preventing the unit from
working loose or twisting.
1-13/64” (30 mm) Mounting
The holder is an integral part of the actu-
ator, it is inserted into the hole in the
panel from the rear and secured from the
front by means of a front ring. With the
use of a legend plate or the thrust and
trim washers, the unit becomes station-
ary and will not twist or work loose.
Front Rings
Both units are supplied as standard with
metal chrome plated front rings. Black
plastic or anodized aluminum rings are
optional at no additional cost. The plastic
rings are recommended for use where
the atmosphere may be corrosive.
LED Indicating Lights (Optional)
Since LED’s consume less power, their
life is 10 to 20 times that of conventional
incandescent lamps. They also provide
greater resistance to shock and vibration.
Where lamp integrity and low mainte-
nance is crucial, the 3SB0 LED indicator
is recommended.
Contact Blocks
One line of contact blocks fits both size
devices. All have parallel double break
contacts with wiping action and reliability
nibs to insure long, maintenance-free
operation. The design is also well suited
to low energy circuits common on pro-
grammable controller interfaces. Blocks
snap side by side on the holder and lock
in place. The contact block holder is avail-
able in 3 and 5 position versions, elimi-
nating the need for piggyback contacts
which are hard to wire and prone to fail-
ure. Terminals meet the “touchsafe”
requirements of IEC standards and are
clearly marked.
Wire funnels, screwdriver guides, and
captive terminal screws make the con-
tacts easy to wire while self lifting spring
washers insure that the wire stays
secure under severe vibration.
Special contact blocks are available for
solder connection to printed circuit
boards. When used with the special
operator adaptor, they present a unique
solution to multiple button operator
panels.
Pushbutton Unit
7/8” (22 mm) Mounting
Pushbutton Unit
1–13/64” (30 mm) Mounting
