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2015/16/17
Specifications
Euclid
™
Type PBC / WPBC / XPBC Pendant
Pushbutton Stations
Application
PBC cam-operated pushbuttons
are engineered for all heavy-
duty applications that require ut-
most reliability and the combi-
nation of single and multi-speed
performance such as crane and
mill drives.
Description
The Plungers are one-piece
molded high impact phenolic.
The button surface is concave
for easy thumb operation. In the
assembly, the plunger is pro-
tected by steel mounting
rib sections and the
recessed shape of the front
cover. Plungers are mechani-
cally interlocked.
Return Springs — Two extra-
long, low-stress, corrosion
proof springs are provided for
each plunger. They are engi-
neered for maximum depend-
ability, safety and ease of
plunger operation.
Cam Plates are molded of self-
lubricating Nylatron® GS and
have a series of openings to al-
low the movable contacts to
close in sequence against the
stationary contacts. Cam plates
are keyed to the operating
plungers. Desired operating
sequences can be obtained by
inserting the proper cam plate.
The Contact Blocks, to which
the stationary and movable con-
tacts and terminals are as-
sembled, are compression
molded from fiberglass polyes-
ter material. This material is
highly resistant to shock, arcing
and tracking.
The heavy-butt-type silver
Stationary Contacts and termi-
nals are riveted to the contact
block.
The Movable Contact Bar with
its silver contact-buttons is fas-
tened to the contact block
by a post and silver coated
beryllium copper Contact
Spring arrangement. The
silver-to-silver alignment pro-
vides unusually long contact
life. A slight wiping action
of the movable contact pro-
motes self-cleaning and opti-
mum conductivity.
The contact block assembly is
easily replaced as a unit.
Modifications
Many modifications and spe-
cial features are available for
the PBC WPBC and XPBC
pushbutton stations:
• duplex mounting
two stations
• interconnecting
conduit box
• bottom or side handles
• mushroom head
operators
• emergency stop
wobble stick
• selector switches
• special sequence
multi-speed inserts
• stepless pushbutton
inserts
• plus much more…
Features
The modular, cam-operated,
PBC pushbutton insert is
used in all PBC, WPBC
and XPBC pushbutton sta-
tions. Only the style of the
housing and operator
varies to meet environmental
requirements.
• 150VAC or 300VDC
• Unique, plunger-
operated, Nylatron®
cam plates.
• Silver-to-silver self
cleaning contacts.
• Contact blocks easily in-
spected and replaced.
• Up to 5–speed points.
• Up to 8 common circuits
plus feed for each direc-
tion provide unlimited
operating sequences.
• Large, mechanically
interlocked buttons.
• Grounding connection at
cable entrance area.
Contact Block
Assembly
Cam Plate
Plungers
Cam Plate
Contact Block
Assembly
Mounting Rib
Section
Contact Ratings
Single Break
AC
DC
NEMA
B150
NEMA
P300
*
OSHA limits pendant voltage
to 150VAC or 300VDC
120V
240V*
3A
—
125V
250V
1.1A
0.55A
440/428-1161 • Fax 440/428-7635
4
HUBBELL