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Low Voltage Contact Blocks
Product Profile
Bulletin 800E Two-Across PenTUFF™
Contact Blocks
Allen-Bradley introduces the Bulletin 800E 2X PenTUFF ™ low
voltage contact blocks. These contact blocks are designed to
offer superior low voltage switching performance for use
in all types of low voltage/low current applications. They
can also be used in medium voltage AC applications
(refer to “Ordering Information” for more details).
As a guideline, voltage and current specifications at or below
24V DC and 24 mA respectively, are ideal for PenTUFF ™ contact
blocks. The graph below will help determine when low voltage
contact blocks can be used.
Bulletin 800E 2X PenTUFF™ low voltage contact blocks are
specifically designed with the following applications in mind:
• PLCs: Programmable logic controllers often communicate in low
voltage DC and medium voltage AC environments between input
and output devices. Push buttons that communicate with PLCs
will perform better with contact blocks that meet the design
specifications and service reliability in those voltage and
current ranges.
• Communications: “Contact bounce” can occur during contact
opening and closing or when vibrations are present in the
application. This can cause process interruptions. The improved
pentafurcated spanner design reduces “contact bounce”, and
takes communication reliability to a new level.
These reliability improvements will result in lower maintenance
costs and reduced down time!
Note: This graph represents typical operating ranges for low
voltage contacts. For products other than PenTUFF ™, refer
to the specific product ratings to insure proper contact
selection for that application.
increases the likelihood of forcing open the contacts in the
event of contact tack or stickiness. Additionally the double
break spanner design will distribute arc energy across two air
gaps. This adds reliability to the circuit by decreasing contact
weld tendency.
• All components used in the PenTUFF ™ contact blocks are
corrosion resistant. The “Pentafurcated” spanner is made of an
inert precious metal Palladium alloy. The stationary contacts and
terminals are gold plated and nickel underplated, with a brass
Benefits
• The Bulletin 800E 2X PenTUFF low voltage contact blocks
™
base and silver nickel contact pads. The terminal clamps and
virtually eliminate contamination on stationary contact surfaces
screws are stainless steel. This degree of corrosion resistance
through the use of a redesigned flexible spanner. The spanner
yields a contact block like no other found in the industry!
flexes producing a wiping motion that cleans the stationary
contact surface during every make and break. This product
Closed Contact
Open Contact
feature is especially beneficial for push buttons that are
used infrequently!
• The “Pentafurcated” spanner design has 5 contact fingers
on each side of the spanner making it possible to have 961
different current paths. The fingers make contact with the
rounded stationary surface at progressive intervals in a
blanketing effect. Contact bounce is virtually eliminated,
Pentafurcated
Spanner
Rounded Stationary
Contact
increasing the relative circuit reliability. Refer to the
Illustration (at right) to see the “Pentafurcated” spanner
as it makes contact with the rounded contact surface.
• Butt-Type spanner designs are prone to intermittent contact
Ordering Information
• PenTUFF ™ contact blocks are offered in:
opening due to shock and vibration within their environments.
– 1 N.O. contact: Cat. No. 800E - 2X10V
The “Pentafurcated” spanner’s range of flexure prohibits
– 1 N.C. contact: Cat. No. 800E - 2X01V
intermittent contact opening and creates a more reliable circuit
– 1 N.O. contact with 2X latch: Cat. No. 800E - 2LX10V
connection. Each “Low Mass Finger” is designed to bounce
– 1 N.C. contact with 2X latch: Cat. No. 800E - 2LX01V
less as it makes contact with the rounded stationary contact.
• Resistive or inductive loads:
Additionally, each finger can carry the maximum full load current
– Minimum DC: 5V, 1 mA
during contact switching.
– Maximum DC: 125V, .22 A R150 DC rating
• Voltage surges can cause contacts to tack or become sticky.
– Maximum AC: 240V, .75 A C300 AC rating
The direct drive design (a mechanical direct link between the
• UL/CSA listed; CE compliant with the low voltage directive
top surface of the push button and the moving spanner) greatly
• IP-2X finger safe covers are standard
Publication 800E-PP005A-EN-P — December 2000
© 2000 Rockwell International Corporation. All rights reserved. Printed in USA.