3
Installation Instructions for the Walking Beam
Interlock for PD4 Circuit Breakers and Molded
Case Switches
EATON
www.eaton.com
Bores
Bores
Counter
Sunk
2-1.
The walking beam interlock must be adjusted before the circuit
breakers are connected to an electrical system. Carry out
adjustment procudure as follows:
3. ADJUSTMENT
Fig. 2-1 Hole Sizes for Installing Walking Beam Mounting Bracket.
Instruction L
eaflet
Effective October 2020
IL012380EN
WARNING
BEFORE ATTEMPTING ANY WORK ON CIRCUIT
BREAKERS INSTALLED IN AN ELECTRICAL SYSTEM,
MAKE SURE THE CIRCUIT BREAKERS ARE SWITCHED
TO THE OFF POSITION AND THAT THERE IS NO
VOLTAGE PRESENT WHERE WORK IS TO BE
PERFORMED. SPECIAL ATTENTION SHOULD BE PAID
TO REVERSE FEED APPLICATIONS TO ENSURE NO
VOLTAGE IS PRESENT. THE VOLTAGES IN ENERGIZED
EQUIPMENT CAN CAUSE SEVERE PERSONAL INJURY
OR DEATH.
Determine thickness of customer-supplied mounting panel.
From Fig. 2-1, select hole type and sizes for installing walking
beam mounting bracket. For panel thicknesses from .125 inch
to less than .500 in.(from 3.18 mm to less than 12.7 mm) use
countersunk holes. For panel thicknesses from .500 inch up to
1.00 inch (from 12.7 mm up to 25.4 mm) use counter-bored
holes.
2-3. Install mounting bracket to back of customer-supplied
mounting panel using two screws and lock washers
supplied (Fig.2-5).
2-4. When mounting circuit breakers to panel, insert two nylon
insulating plugs in .625 inch (15.88 mm) diameter holes
between mounting panel and circuit breaker (Fig. 2-5).
2-2. Predrill circuit breaker mounting panel. Fig. 2-2 (PD4, 2- and
3-pole) and Fig. 2-3 (PD4, 4-pole) show mounting panel hole
sizes and dimensions for the breaker configurations.
Dimensions are in inches and (millimeters).
CAUTION
TWO NYLON SPACERS ARE PROVIDED IN THE
WALKING BEAM INTERLOCK KIT. THE SPACERS MUST
BE INSTALLED BEFORE THE CIRCUIT BREAKERS ARE
MOUNTED. FAILURE TO INSTALL THE SPACERS CAN
RESULT IN PHASE-TO-GROUND ARCING AND LEAD
TO EQUIPMENT FAILURE AND DAMAGE.
2-5. Mount circuit breakers to front surface of mounting panel
using hardware supplied with the circuit breakers.
Plunger access holes in the back of the circuit breakers
should line-up with holes previously drilled in panel.
2-6. Insert ends of plungers through the mounting panel, and
insulating plugs into the circuit breakers (Fig. 2-5).
2-7. Position steel beam inside legs of mounting bracket. Install
pivot pin through bracket and steel beam (Fig 2-6). Secure
pivot pin in position using two small cotter pins and
flat washers supplied.
2-8. With both the circuit breakers in the OFF position, attach
the plungers to the steel beam using the longer cotter pins
supplied (Fig. 2-7). Use outer holes in steel beam for 4-pole
application and inner holes for 2-and 3-pole applications.
3-1. Turn one circuit breaker to the ON position and the other
to the OFF position.
3-2. Screw 2 inch (50.8 mm) pan-head screw together with nut
and lockwasher into threaded hole on top of the mounting
bracket. (Fig. 2-7).
3-3. Finger tighten the screw down on to the beam pivot pin until
all rocking of beam is eliminated. Torque the screw to 4 lb-in
max. (0.45 N.m).
DO NOT over-tighten.
