Operating Instructions

Chapter 2—Hardware Features
PX Series Enclosures and Service Boxes
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70
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Siemens Industry, Inc.
Owner's Manual
588-682
Building Technologies
2019-01-25
PX Series Enclosures and Service Boxes
PX Series enclosures house both electronic and pneumatic components. The
enclosures include a perforated backplane for mounting TC Series field panels or other
electronic or pneumatic components.
General features of the enclosures include:
● Availability in three sizes to match installation needs: 18-, 19-, and 34-inch.
● Sturdy construction, which accommodates secure conduit fittings and protects
components against incidental contact and falling dirt.
● UL Smoke Control listed for indoor use (19- and 34-inch enclosures only).
● Multiple knockouts along the top and bottom.
● Perforated backplane, which extends wall-to-wall for mounting of additional
equipment.
● Spacious interior for easy routing and termination of wiring.
The 18-inch enclosure is a pull-box type utility cabinet for low cost installations. It is
equipped with the following:
● Factory-installed 16” × 12” perforated panel
● DIN rail and wire tie bar kit
The 19- or 34-inch PX series enclosures are equipped with the following:
● Factory-installed backplane assembly, which includes wire tie down rails and DIN
rails
● Label pouch
● Hinged door and key lock
● Conduit knockouts and venting
PX Series Service Box Features
The PX Series Service Box Assemblies transform either 115 Vac or 230 Vac to 24 Vac
sized for either 192 VA or 384 VA.
● The 192 VA service boxes mount directly inside a 19- or 34-inch PX Series
Enclosure.
● The 384 VA service boxes provide additional power for larger systems and mount
only in the 34-inch PX Series Enclosure.
The service boxes provide protection against electrical transients and are Smoke
Control and Energy Management listed when installed according to the
Service Box
Assemblies Installation Instructions
(553-131).
The service box assemblies consist of the following:
● Chassis for mounting inside enclosure.
● ON/OFF circuit breaker for transformer.
● Two Class 1 power limited 24 Vac outputs, which include one terminal for earth
ground for use inside enclosure only.
● One Class 2 output with circuit breaker to distribute up to 96 VA for use outside the
enclosure.
● Wire cover for field connections.
● Duplex Service Outlet (115 Vac models only).
● Optional sidewall kits PXA-SW192VA and PXA-SW384VA may be used for
installation in third-party enclosures, such as motor control cabinets.