Section 6: Rating Plugs - Eaton 520 Operating Manual

Operating Manual for Series NRX
Trip Units - Digitrip™ 520/520M

Section 6: Rating plugs

The rating plug defines the rated current (In) for the trip unit and is the
basis for the trip unit current settings:
1. The instantaneous and ground current setting (if provided) are
multiples of (I )
n
2. The long delay current setting, (I
Long Delay current setting = (I
3. The short delay current setting is a multiple of (Ir):
Short Delay current setting = SD x (I
A rating plug value, (I ), that is less than the breakers maximum
n
continuous current rating (as listed on the nameplate of the breaker I
may be chosen to be the basis for the coordination of the protection
function of the circuit breaker without affecting its short-circuit current
capability.
Generally, ratings plugs are defined per customer breaker selection
upon ordering and are installed in the factory. Field-installable kits are
also available as defined in Tables 9 and 10.
Table 9. Series NRX NF Frame Raoing Plugs
Frame Size 630A

RP I
n
400 x
500 x
600 x
630 x

800 -
1000 -
1200 -
1250 -
1600 -
IEC Only - (not UL Listed)

), is a fractional multiple of (I
r
) = LD x (I )
r n
) = SD x [LD x (I )]
r n
Group A
800A
Catalog Number
x NA400T
IZMX_RP40A-400
x NA500T
IZMX_RP40A-500
x NA600T
IZMX_RP40A-600
x NA630T

IZMX_RP40A-630
x NA800T
IZMX_RP40A-800
- -
- -
- -
- -
THE RATED CURRENT VALUE OF A RATING PLUG MUST NOT EXCEED
THE MAXIMUM CURRENT FRAME RATING AS LISTED ON THE BREAKER
NAMEPLATE.
For the Series NRX-NF frame, there are three groupings of rating plugs
available: Group A, Group B, Group C (Table 9). It is important to select
):
n
the proper group when choosing another replacement rating plug for
a particular circuit breaker application. The identification label on the
cover of the circuit breaker will identify the proper group rating plug
required.
For the Series NRX-RF frame, there are four groupings of rating
) plugs available: Group D, Group E, Group F and Group G (Table 10).
u
The identification label on the cover of the circuit breaker will identify
the proper group rating plug required if a replacement rating plug is
desired.
Group B
1000A 1200A 1250A
 
Catalog Number
x x x NB400T
IZMX_RP40B-400
x x x NB500T
IZMX_RP40B-500
x x x NB600T
IZMX_RP40B-600
x x x NB630T
  
IZMX_RP40B-630
x x x NB800T
IZMX_RP40B-800
x x x NB1000T
IZMX_RP40B-1000
- x x NB1200T
IZMX_RP40B-1200
- - x NB1250T

IZMX_RP40B-1250
- - - -
Instruction Leaflet IL01301051E
effective September 2013
• WARNING
Group C
1600A
Catalog Number
- -
- -
- -
- -
x NC800T
IZMX_RP40C-800
x NC1000T
IZMX_RP40C-1000
x NC1200T
IZMX_RP40C-1200
x NC1250T

IZMX_RP40C-1250
x NC1600T

IZMX_RP40C-1600
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