36
Operating Manual for Series NRX
Trip Units - Digitrip™ 520/520M
EATON
www.eaton.com
Instruction Leaflet
IL01301051E
effective September 2013
Figure 33.
PH
1
A
PH
2
B
PH
3
C
4
3
2
1
4
3
2
1
4
3
2
1
CU
TO
FF
MO
TO
R
SWIT
CH
SC
EO1
EO2
+
MO
TO
R
OPER
AT
OR
ELEC
TRIC
(O
PTIONAL)
ab
ba
ab
4a 4b
AU
X. BO
X
TR
AY
(L
OC
AT
ED IN RIGHT POLE
)
EO1
37
38
EO2
39
SC
a1
44
b1
45
c2
47
a3
50
b3
51
c4
53
43
c1
46
b2
48
a2
49
c3
52
b4
54
a4
24
6
13
5
M
SEE NO
TE
8
Series NRX-NF frame (IZMX16/IZM91) breaker masoer cNnnecoiNn diagram drawing number 6D32389 (cNnoinued frNm
previNus page)
NNoes fNr Figures 31 and 32 (Diagram drawing number 6D32389 - NF Frame)
1.
All contacts shown with circuit breaker open and discharged and control power de-energized. The OTS are shown in reset position.
2.
All trip unit wires are #22 AWG—0.34 mm
2
—300V.
3.
All accessory wires are #18 AWG—0.82 mm
2
—600V.
4.
54 contacts maximum.
5.
PT module inputs for Digitrip 1150 only.
6.
Connectors K15 and K16 are not always present.
7.
On three-pole circuit breakers only, connector K4—1.2 wires only are wired out to secondary contacts.
8.
Odd number contacts have guide rib on black housing.
9.
Zone interlock wiring shown dotted—optional jumper is standard.
10. Latch check switch can be wired either externally (option) or internally (option) to a spring release accessory. Wiring LCS internally
ensures the one-shot pulse provided by the SR circuitry is made active only after the mechanism spring is charged and the latch is
in its proper state.
11. For accessories having a DC rating, the odd numbers will be treated as positive voltage.
12. Reserved for spring charge SC input contact.
13. For Digitrip 520M ALM2 is an alarm used for GF (Ground fault style trip unit). ALM1 is used for diagnostic alarm or maintenance mode
active. For Digitrip 1150, these contracts can be programmed as desired.