Section 3: General Operation And Circuit Breaker Description; Introduction; Installing The Drawout Circuit Breaker In The Cassette - Eaton NRX Instruction Manual

Section 3: General operation and circuit breaker
description

Introduction

CAUTION
Make certain that the cassette is properly mounted or
seated securely on a work table before attempting to have
the breaker fully extended on the cassette's drawout rails.
Failure to comply could result in the cassette tipping for-
ward resulting in equipment damage and/or bodily injury.
Series NRX low voltage circuit breakers are available in both
drawout and fixed mounting configurations (Figure 2 and
Figure 4) as three-pole or four-pole breakers.
All circuit breakers should be operated manually and/or elec-
trically before they are put into service. This can be done
during the installation process or some later date prior to
startup.

Installing the drawout circuit breaker in the cassette

In a structure equipped for a drawout circuit breaker, a
bolted-in cassette with movable, captive extension rails sup-
ports the circuit breaker.
CAUTION
It is important to take care when placing a drawout circuit
breaker on its extension rails. If the circuit breaker is not
properly seated on the rails, the breaker could fall causing
equipment damage and/or bodily injury.
To install the drawout circuit breaker, proceed first with the
following four steps.
Step 1: Press the extension rail spring away from the exten-
sion rail until the retaining pin is fully released. Each draw-
out rail is provided with a curved cutout to accommodate a
gloved hand.
Series NRX with PXR - type RF low voltage power (air) circuit breakers instruction manual MN013002ENH03 September 2016 www.eaton.com

Section 3: General operation and circuit breaker description

Figure 12. Step 1.
Extension
rail spring
Step 2: Lower both rails down into their extended and
locked position.
Figure 13. Step 2.
Step 3: Carefully place the circuit breaker on the extended
rails. Be certain that the circuit breaker's metallic support
wheels (two on each side of the circuit breaker) are properly
seated on the extension rails. With breaker properly seated
on the extension rails, slide the breaker fully into the cas-
sette and raise both rails up into the cassette so that they
engage the extension rail spring. The breaker is now in the
cassette in the DISCONNECT position.
11