Installation Guide

40269-469-02 QO

Circuit Breaker Load Centers

03/2006 Instruction Bulletin

INSTALLATION FOR QOT CIRCUIT BREAKERS

NOTE: Square D

Class CTL load centers are designed to restrict the

installation of more overcurrent devices than that number for which each was

designed, rated and approved. To accomplish this, the mounting means for

QOT

circuit breakers is different from QO

and Q1

circuit breakers.

Installation

NOTE: Type QOT tandem circuit breakers may be installed only in load

centers where the mounting rail has a slot at the center line of the desired pole

place.

1. Turn OFF (O) circuit breaker.

2. Hold QOT circuit breaker at a 30° angle and insert mounting cam (A) in

mounting rail (B) as far as possible.

3. Rotate circuit breaker until plug-on jaws (C) plug securely onto bus bar

connector (D).

NOTE: Bottom of circuit breaker case should remain against mounting rail.

4. Install wires.

Removal

1. Turn OFF (O) circuit breaker.

2. Remove wires.

3. Disconnect circuit breaker by rotating the plug-on jaws (C) away from bus

bar connector (D) until the jaws disengage.

4. Remove circuit breaker from the mounting rail (B).

Figure 3: Tandem Circuit Breaker Mounting and Removal

CAUTION

HAZARD OF EQUIPMENT DAMAGE

• Before energizing load center, turn main and branch circuit breakers to OFF (O) position. After power is

turned on to load center, turn main circuit breaker ON (I) and then turn on branch circuit breakers.

• See lug data chart on load center wire diagram for lug torque specifications.

• See circuit breaker marking for circuit breaker lug torque specifications.

• The QOT mounting cam is thick, hardened steel. Excessive force to improperly install a tandem circuit

breaker where no mounting slot is provided will destroy the circuit breaker case.

Failure to follow these instructions may result in equipment damage.

11309618

Mounting Rail

40269-469-02.fm Page 3 Thursday, April 20, 2006 9:23 AM