2
Instruction L
eaflet
Effective October 2020
Installation Instructions for the Walking Beam
Interlock for PD4 Circuit Breakers and Molded
Case Switches
EATON
www.eaton.com
IL012380EN
WARNING
DO NOT ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS
ENERGIZED. DEATH, SEVERE PERSONAL INJURY, OR
SUBSTANTIAL PROPERTY DAMAGE CAN RESULT
FROM CONTACT WITH ENERGIZED EQUIPMENT.
ALWAYS VERIFY THAT NO VOLTAGE IS PRESENT
BEFORE PROCEEDING WITH THE TASK, AND ALWAYS
FOLLOW GENERALLY ACCEPTED SAFETY
PROCEDURES.
EATON IS NOT LIABLE FOR THE MISAPPLICATION OR
MISINSTALLATION OF ITS PRODUCTS.
When the walking beam interlock is used, the wiring troughs in
the back of each circuit breaker base are blocked by the plungers
and cannot be used for opposite side-exiting accesory pigtail leads.
This instruction leaflet (IL) gives detailed procedures for installing
the walking beam interlock.
The walking beam interlock must be mounted before the circuit
breakers are connected to an electrical system. Installation
consists of drilling mounting panel to accept circuit breakers and
walking beam assembly; securing circuit breakers to mounting
surface and; installing walking beam. To install the walking beam
interlock, perform the following steps:
2. INSTALLATION
The user is cautioned to observe all recommendations,warnings,
and cautions relating to the safety of personnel and equipment, as
well as all general and local health and safety lawscodes, and
procedures.
The recommendations and information contained herein are based
on Eaton experience and judgement, but should not be considered
to be all-inclusive or covering every application or circumstance
which may arise. If any questions arise, contact Eaton for further
information or instructions.
1.
INTRODUCTION
General Information
The walking beam interlock (Fig.1-1) provides mechanical
interlocking between two adjacent circuit breakers of the same
pole configuration to prevent both circuit breakers from being
switched on at the same time. The walking beam interlock
assembly is bolted to the rear of a customer-supplied mounting
panel.The circuit breakers are then secured to the mounting
panel. Plungers are inserted through access holes in the
mounting panel and base of each circuit breaker. The plungers
are then attached to each end of the beam assembly.
Adjustment of the walking beam assembly is necessary for the
panel thickness being used. Customer-supplied mounting panels
from .25 to1.00 in.(3.18 to 25.40 mm) can be used with the
walking beam interlock.
Fig. 1-1 Walking Beam Interlock Installed Between Two 3-pole
PD4 Circuit Breakers.
Note: Factory modified circuit breakers must be ordered to install
the walking beam interlock.
