Eaton Magnum PXR, User Manual

5

User Manual 

MN013016EN

Effective July 2022

Magnum PXR and Power Defense SB low 

voltage power circuit breakers user manual  

EATON

 www.eaton.com

Purpose

This instructional booklet is expressly intended to cover the 

installation, operation, and maintenance of Magnum PXR and 

Power Defense SB (PD-SB) circuit breakers . These circuit breakers 

may be supplied as part of complete switchboard assemblies or as 

separate components . This manual applies only to the circuit breaker 

and (if drawout) its mating cassette . In the case of fixed versions 

of Magnum PXR and PD-SB circuit breakers, certain sections of 

this manual, referring to such items as position interlocks and the 

drawout mechanism, will not apply .
Trip units associated with Magnum PXR and PD-SB power circuit 

breakers will be addressed in a general manner in this manual . 

Specific trip unit details and time-current characteristic curves are 

covered in separate documents specific to the trip units .
Magnum PXR and PD-SB circuit breaker accessory items are 

discussed briefly in this manual . Field installation instructions for 

such items, however, are covered in individual instructional leaflets 

specific to the accessory . This information is also available from the 

Eaton website at www .eaton .com/magnumpxr .
For application information, consult Eaton or see applicable product 

guides, technical documents, application publications, and/or 

industry standards .

Safety

All safety codes, safety standards, and/or regulations must be 

strictly observed in the installation, operation, and maintenance of 

this equipment .

m

 WARNING

THE WARNINGS AND CAUTIONS INCLUDED AS PART OF THE PROCEDURAL 

STEPS IN THIS MANUAL ARE FOR PERSONNEL SAFETY AND PROTECTION 

OF EQUIPMENT FROM DAMAGE. AN EXAMPLE OF A TYPICAL WARNING 

LABEL HEADING IS SHOWN ABOVE TO FAMILIARIZE PERSONNEL WITH 

THE STYLE OF PRESENTATION. THIS WILL HELP TO ENSURE THAT 

PERSONNEL ARE ALERT TO WARNINGS. IN ADDITION, CAUTIONS ARE  

ALL UPPER CASE AND BOLDFACE.

All possible contingencies that may arise during installation, 

operation, or maintenance, and all details and variations of this 

equipment do not purport to be covered by these instructions . If 

further information is desired by purchaser regarding the particular 

installation, operation, or maintenance of particular equipment, 

contact the local Eaton representative .

Section 1: Introduction

General information

The Magnum PXR and PD-SB power circuit breakers can be fixed 

or drawout air circuit breakers using an electronic tripping system . 

All breakers are designed for use in both switchboard and metal-

enclosed switchgear assemblies having a maximum voltage of 

635 Vac . Magnum PXR (MPS and MPN) and PD-SB (SPS and 

SPN) circuit breakers are available in four physical frame sizes with 

continuous current ratings from 800 A through 5000 A (Magnum 

PXR available through 6000A), and interrupting capacities from 42 kA 

to 100 kA . The four physical frame sizes have common height and 

depth dimensions, differing only in width (

Figure 1

) . Circuit breaker 

nameplates provide complete rating information . All Magnum PXR 

and PD-SB circuit breakers are 100% rated, UL® Listed, and are 

built and tested in an ISO® 9002 certified facility to applicable 

NEMA®, ANSI, IEEE®, and UL standards (

Table 1

, 

Figure 2

, and 

Figure 3

) .

Magnum PXR and PD-SB circuit breakers use a rigid frame housing 

of engineered thermoset composite resins that has high-strength 

structural properties, excellent dielectric characteristics, and arc 

tracking resistance .
MPS, MPN, SPS, and SPN drawout circuit breakers are a 

through-the-door design, having three breaker positions with the 

compartment door closed (CONNECT, TEST, DISCONNECT) and one 

position out of its compartment on extension rails (REMOVE) . The 

operating mechanism is a two-step stored energy mechanism, either 

manually or electrically operated .
When withdrawn on captive compartment cassette extension 

rails, MPS, MPN, SPS, and SPN circuit breakers can be inspected, 

accessory items added, and minor maintenance performed . The 

inside of the compartment can also be inspected with the circuit 

breaker on its extension rails .

m

 NOTICE

PLEASE READ AND UNDERSTAND THESE INSTRUCTIONS BEFORE 

ATTEMPTING TO UNPACK, INSTALL, OPERATE, OR MAINTAIN THIS 

EQUIPMENT. STUDY THE BREAKER AND ITS MECHANISM CAREFULLY 

BEFORE ATTEMPTING TO OPERATE IT ON AN ENERGIZED CIRCUIT.

m

 WARNING

MAGNUM AND POWER DEFENSE CIRCUIT BREAKERS SHOULD NOT UNDER 

ANY CIRCUMSTANCES BE APPLIED OUTSIDE THEIR NAMEPLATE RATINGS. 

OPERATION OUTSIDE OF THESE RATINGS COULD RESULT IN DEATH, 

BODILY INJURY, OR PROPERTY DAMAGE.