AC Controls
Pilot Device Units
General
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
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,
Pushbutton Unit
7/8” (22 mm) Mounting
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
15
AC Controls
CSI Section 16160 | Siemens Electrical Products and Systems | 309 |
| Specification Guide |
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