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Eaton
KT3225T
Thermal-Magnetic Trip Unit Only


Eaton KT3225T Thermal-Magnetic Trip Unit Only
Series-C
Frame Size - K
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Type KT (3-Pole) Shown

KT3225T Thermal-Magnetic Trip Unit Only

Number
of Poles
Amperes Interrupting
Capacity
Type
of Trip
Terminals
3 225 For Use With
Standard, High or Ultra-High

Interrupting Frames
Adjustable
Thermal-Magnetic
Standard

Quick Reference Guide

NEMA/UL 489/CSA Interrupting Capacity Ratings
Circuit
Breaker
Type
Number
of Poles
Interrupting Capacity (kA Symmetrical Amperes)
Volts AC (50/60 Hz) Volts DC
240 277 480 600 250(1)(2)
DK 2, 3 65 10
KDB 2, 3, 4 65 35 25 10
KD 2, 3, 4 65 35 25 10
HKD, HKDB 2, 3, 4 100 65 35 22
KDC(4) 2, 3, 4 200 100 65 22
CKD 3 65 35 25
CHKD      3 100 65 35
IEC 157-1 (P1) Interrupting Capacity Ratings
Circuit
Breaker
Type
Number
of Poles
Interrupting Capacity (kA Symmetrical Amperes)
Volts AC (50/60 Hz) Volts DC
240 380 415 440 500 600 250(2)(3)
DK 2, 3 65 10
KDB 2, 3, 4 65 40 40 10
KD 2, 3, 4 65 40 40 10
HKD, HKDB 2, 3, 4 100 65 65 22
KDC 2, 3, 4 200 100 100 —  22

NOTES:
(1) Two-pole breaker supplied in three-pole frame. Current carrying parts omitted from center pole.
(2) Two-pole circuit breaker or two outside poles of three-pole circuit breaker.
(3) Time constant is 3 milliseconds minimum at 10 kA and 8 milliseconds minimum at 22 kA.
(4) Current limiting.

310+ Specifications

Trip Unit Type Digitrip RMS 310+
Breaker Type
Frame K
Ampere range 250–400A
Continuous current range (A) 55–400A
Ground fault pickup (A) 50–400A
Interrupting capacities at 480 Vac (kAIC) 35, 65, 100
100% rated Yes
Protection
Ordering options LS, LSI, LSG, LS(A), LSIG,
LSI(A), ALSI, ALSIG, ALSI(A)
Arcflash Reduction Maintenance System ALSI, ALSIG, ALSI(A)
Interchangeable trip unit Yes
High load alarm, trip (suffix B20) Yes
Ground fault alarm, trip (suffix B21) LSG, LSIG, ALSIG
Zone selective interlock (suffix ZG) Yes
Cause of trip indication
(Catalog Nos: DIGIVIEW, DIGIVIEWR06, TRIP-LED)
Yes
Thru-cover accessories No

310+ Adjustability Specifications

310+ Settings K-Frame
125A 250A 400A
Ir = continuous current or
long delay pickup (amperes)
(All 310+)
Ir\In  
A (=Ir) 55  100 160
B (=Ir) 60 125 200
C (=Ir) 70 150 225
D (=Ir) 80 160 250
E (=Ir) 90 175 300
F (=Ir) 100 200 315
G (=Ir) 110 225 350
H (=Ir=In) 125 250 400
tLD = long delay time (seconds)
(All 310+)
2 2 2 2
4 4 4 4
7 7 7 7
10 10 10 10
12 12 12 12
15 15 15 15
20 20 20 20
24 24 24 24
ISD x Ir = short delay pickup (amperes)
(All 310+)
Position 1 2 2x 2x
Position 2 3 3x 3x
Position 3 4 4x 4x
Position 4 5 5x 5x
Position 5 6 6x 6x
Position 6 7 7x 7x
Position 7 8 8x 8x
Position 8 10 10x 10x
Position 9 12 12x 12x
Ig x In = ground fault pickup (amperes)
(310+ w/ground fault)
Position 1 25 50 80
Position 2 37.5 75 120
Position 3 50 100 160
Position 4 75 150 240
Position 5 100 200 320
Position 6 125 250 400
Ii x In = instantaneous
maintenance mode (amperes)
(310+ w/maintenance mode)
Position 1
(2.5x)
312 625 1000
Position 2 (4x) 312 625 1000
Position 3 (6x) 312 625 1000
Position 4 312 625 1000
Position 5 312 625 1000
Position 6 312 625 1000
Position 7 312 625 1000

Note: RMM on KD310+ is not adjustable; it is set at 2.5x.

Specifications

Trip Unit Type  Digitrip OPTIM 550 Digitrip OPTIM 1050
rms sensing Yes  Yes
Breaker Type
Frame  K K
Ampere range  125–400A 125–400A
Interrupting rating at 480 volts  35, 65, 100 (kA) 35, 65, 100 (kA)
Protection
Ordering options LSI, LSI(A), LSIG LSI(A), LSIG
Fixed rated plug (In Yes Yes
Overtemperature trip Yes Yes
Long Delay Protection (L)
Adjustable rating plug (In) No  No
Long delay pickup 0.4–1.0 x (In) 0.4–1.0 x (In)
Long delay time I2t 2–24 seconds  2–24 seconds
Long delay time I4t 1–5 seconds 1–5 seconds
Long delay thermal memory  Yes Yes
High load alarm  0.5–1.0 x Ir 0.5–1.0 x Ir
Short Delay Protection (S)
Short delay pickup 150–800% x (Ir) 150–800% x (Ir)
Short delay time I2t 100–500 ms 100–500 ms
Short delay time flat 100–500 ms 100–500 ms
Short delay time zone selective interlocking  Yes(1) Yes
Instantaneous Protection (I)
Instantaneous pickup 200–800% x (In) 200–800% x (In)
Discriminator Yes Yes
Instantaneous override Yes Yes
Ground Fault Protection (G)
Ground fault alarm 20–100% x (Is) 20–100% x (Is)
Ground fault pickup 20–100% x (Is) 20–100% x (Is)
Ground fault delay I2t 100–500 ms 100–500 ms
Ground fault delay flat  100–500 ms 100–500 ms
Ground fault zone selective interlocking Yes(1) Yes
Ground fault thermal memory Yes Yes
System Diagnostics
Status LEDs Yes Yes
Cause of trip LEDs Yes Yes
Magnitude of trip information  Yes Yes
Remote signal contact—ground alarm  Yes(1) Yes
Local auxiliary and bell alarm contact  Optional Included
System Monitoring
Digital display Yes(2) Yes(2)
Current  Yes Yes
Power and energy No Yes
Power quality—harmonics No Yes
Power factor No Yes
Communications
PowerNet Yes(3) Yes
Testing
Testing method OPTIMizer, BIM, PowerNet OPTIMizer, BIM, PowerNet

Legend
BIM = Breaker Interface Module
(A) = GF Alarm
Is = Sensor Rating
In = Rating Plug
Ir = Long Delay Pickup Setting

Notes:
(1) Zone interlock kit.
(2) By OPTIMizer/BIM.
(3) Eaton’s PowerNet kit.

KT3225T Dimensions

Eaton KT3225T Dimensions
Number of Poles Width Height Depth
2, 3 5.50 (149.7) 10.13 (257.3) 4.10 (104.1)
4 7.22 (183.4) 10.13 (257.3) 4.10 (104.1)



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