30072-013-88B
June 2003
Instruction Bulletin
Replaces 30072-013-88A dated 6/99
Raleigh, NC, USA
Locking Attachment for Front-Mounting, LA Auxiliary
Contact Blocks
Retain for future use.
INTRODUCTION This bulletin provides installation information for the LA1REQ3521 locking
attachment for front-mounting auxiliary contact blocks. Use this locking
attachment with front-mounting, LA auxiliary contact blocks, mounted to a
D-Line relay or contactor.
INSTALLATION
DANGER
HAZARDOUS VOLTAGE
Disconnect power before working on the device.
Electric shock will result in death or serious injury.
1. Locate the LA auxiliary contact block’s release lever and spring (see
Figure 1).
Figure 1: Locating the Lever and Spring
LA Auxiliary Contact Blocks—Top View
A
B
4-Pole 2-Pole
2. Using cutting pliers or a similar tool, cut approximately 3/16 in. off the
end of the release lever (A), at the point where the neck meets the
release lever body (see Figure 2). Make sure not to cut into the spring
pocket.
3. Obtain the relay or contactor. If panel mounted, remove it from the
panel.
4. Install the auxiliary contact block onto the relay or contactor.
5. Using a pair of needle-nosed pliers or similar tool, remove the spring (B)
while leaving the lever in place.
6. Orient the locking attachment (C) as shown in Figure 2 and install it into
the position previously occupied by the spring. Ensure that the
attachment is pushed fully into place, flush with the auxiliary contact
block body.
Figure 2: Cutting the Release Lever and Installing the Locking
Attachment
LA Auxiliary Contact Blocks—Front View
C
A
C
A
D
4-Pole 2-Pole
© 1999–2003 Schneider Electric All Rights Reserved 1
D
Locking Attachment for Front-Mounting, LA Auxiliary Contact Blocks 30072-013-88B
Instruction Bulletin June 2003
7. Install the red, square label (D) onto the front of the auxiliary contact
block.
8. While restricting the relay or contactor from movement, apply an upward
force onto the auxiliary contact block. If the auxiliary contact block
releases from the relay or contactor, verify that Steps 2–6 have been
completed successfully.
9. If necessary, reinstall the relay or contactor in the panel.
Square D Company
8001 Highway 64 East
Knightdale, NC 27545
1-888-SquareD (1-888-778-2733)
www.SquareD.com
2
Electrical equipment should be installed, operated, serviced, and maintained only by
qualified personnel. No responsibility is assumed by Schneider Electric for any
consequences arising out of the use of this material.
© 1999–2003 Schneider Electric All Rights Reserved
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