1. General NA15 Air Circuit Breaker 2. Type Designation 3. Features ...

1. General
1.1 Electric ratings: 400A~4000A, 400V, 50Hz;
1.2 Number of poles: 3, 4
1.3 Application: used for protection of power distribution
system;
1.4 Standard: IEC 60947-2.
2. Type Designation
N A 15 - /
3. Features
Number of poles; Blank: 3P; 4: 4P
Frame size rated current
Design sequence number
Air circuit breaker
Company code
3.1 With high breaking capacity;
3.2 With complete protection functions;
3.3 Compact design with fixed and withdrawable versions;
3.4 Lower power consumption and cost-effectiveness.
4. Operating Conditions
Circuit Breakers
NA15 Air Circuit Breaker
4.1 Ambient temperature:
a. -5 ~+40 , the average temperature within 24 hours not exceed +35 ;
b. Customized breakers are available for the breaker of which the upper limit of temperature is =+40orthe lower limit is = -25 ;
4.2 Altitude: 2000m;
4.3 Relative humidity: At mounting site, relative humidity not exceed 50% at the max temperature of +40 ,
higher relative
humidity is allowable under lower temperature. For example, RH could be 90% at +20 .Special
measures should be taken to
occurrence of dews.
4.4 Pollution grade: ;
5. Technical Data
Model
NA15-2000 NA15-4000
Frame level rated current Inm (A)
2000
4000
Rated current In (A)
400, 630, 800, 1000, 1250, 1600, 2000 2000, 2500, 3200, 4000
Number of poles
34 34 Mounting mode
FixedWithdrawable FixedWithdrawable Rated operational voltage Ue (V)
400
400
Rated insulation voltage Ui (V)
690
690
Icu (kA) 400V
50 (COS =0.25)
80 (COS =0.2)
Ics (kA) 400V
40 (COS =0.25)
60 (COS =0.2)
Icw (kA) 0.4 s time-delay, 400V
40 (COS =0.25)
60 (COS =0.2)
Operating properties Electrified operating frequency
500
500
(operations)
Un-electrified operating frequency
4500
2500
Arcing distance (mm)
0
0
Weight (kg)
Note:
46 76 69 108 87 164 102 191
a. An arcing distance of 50 mm should be remained for breaker installation if the customer do not use zero arcing distance shield;
without special explanations, the breaker is appended with the shield;
b. Mode of down-lead: upper and lower down-lead.
.32.

Circuit Breakers
6. Product Overview
13
12
5
11
10
3
6
1
8
2
4
7
.33. .34.
9
NA15 Air Circuit Breaker
1
2
3
4
5
6
7
8
9
10
11
12
13
Breaker body
Drawer support
Panel
Handle
Intelligent controller
Operating mechanism
Auxiliary contact
Arc-extinguishing chamber
Secondary connecting part
Shunt release
Closing electro-magnet
Electric motor
Under-voltage release

7. Structure
.35.
Circuit Breakers
7.1 Front view of the body
1
2
3
4
5
6
7
8
9
10 11
7.2 Drawer support
Three operation statuses of the drawer are available:
a. Making: both of the main circuit and secondary circuits are connected;
b. Testing: the main circuit breaker breaks, only the secondary circuit is connected;
c. Departure(Dis-connected): both of the main and secondary circuits are not connected.
1. Zero-arcing shield
2. Auxiliary contact (can see when taking)
3. Handle
4. Breaking pushbutton
5. Making pushbutton
6. Making & breaking indication
7. Intelligent controller
8. Energy-storage indication
9. Drawer handle
10. Indication of drawer support position
11. Drawer support

8. Intelligent Controller
Intelligent controller is one of the core components of the circuit breaker;
8.1 Properties of the intelligent controller
a. Protective functions of over-load protection with long lim-delay, shortcircuit
protection with short time-delay and invrse time limit, instantaneous
operation protection.
b. Single-phase grounding failure protection;
c. Display of setting current Ir and operation current;
d. Short-circuit alarm;
e. Over-load alarm;
f. Grounding failure protection alarm;
g. Testing of operation properties
8.2 Protection performances of intelligent controller
a. Ir and its error of the controller
Frame level rated
current Inm (A)
2000
4000
Long time-delay Ir1 Short time-delay Ir2 Instantaneous Ir3 Grounding failure protection
Ir1 Error Ir2 Error Ir3 Error Ir4 Error
(0.4~1) In
b. Characteristic of long time-delay
15% (3~10) In 15% (6~20) In 15% (0.2~0.8) In
Note: When the breaker could realize long time-delay and overload, short-circuit and short time-delay, and short-circuit
instantaneous protections, the setting ratings can not be over-lapped, and Ir1Ir2 Ir3;
Ir1 1.05 Ir 1.3 Ir 1.5 Ir 3.0 Ir1
Operating time (s) 2h non-tripping 1h tripping 30, 60, 120, 240
2 L L L
15%
Returnable time 8s,
returnable current is 0.9Ir1
Note: I2T L=(1.5Ir1)
t (in the formula, T is the setting time at 1.5 Ir1; Ir1 is the long time-delay setting current; T is long
time-delay operation time). Error of the setting values is 15%.
c. Characteristic of short time-delay
The operation time is 0.2s and 0.4s, the error is 20%.
d. Grounding failure protection
The time-delay operation time at the grounding failure protection status is 0.2s and 0.4s, the error is 20%.
e. OFF status is available for all the protection functions so as to the users could make selection on combination of different
functions.
9. Max. Manual operating force of the circuit breaker.
Inm (A) Max. Operating force (manual) (N)
2000
4000
200
450
.36.

.37.
Circuit Breakers
10. Standard Composition of breaker
To facilitate your ordering and utilization, the NA15 air circuit breaker is appended with basic electric accessories as follows.
Standard composition of the breaker Fixed version Withdrawable version
Body
Intelligent controller
Drawer support
Shunt release
Under-voltage release
Closing electro magnet
Horizontal connection
Electric motor
Door frame
Auxiliary contacts
11. Accessories
11.1 Under-voltage release
a. Two types of the release are available: under-voltage instantaneous release and under-voltage
release with time-delay, the delay time is 1s and 3s.
b. Before operation of the circuit breaker, the under-voltage release should firstly be electrified;
c. Ratings of under-voltage release
Rated operational voltage Ue (V)
Operational voltage
Voltage for reliable making
Voltage for reliable non-breaking
Power consumption (W)
AC400, AC230
(35%~70%) Ue
(85%~110%) Ue
35%
Ue
40
11.2 Shunt release
a. Shunt release is for remote breaking of circuit breaker so as to enhance security of the operator;
b. Applicable to short time working system, long-time electrification is prohibited;
c. Ratings of the release
Rated operational voltage Ue(V)
Operational voltage
Power consumption
Rated operational voltage Ue(V)
Operational voltage
Power consumption
AC400
AC400
AC230
AC230
DC220
(70%~110%) Ue
57VA 44VA -
DC220
DC110
11.3 Closing electro-magnet
a. The magnet is for remote making of circuit breaker so as to enhance security of the operator;
b. Applicable to short time working system, long-time electrification is prohibited;
c. Ratings of the magnet
(85%~110%) Ue
680VA 670VA
-
-
DC110
-

11.4 Auxiliary contacts
a. Auxiliary contact: 4NO+4NC or 6NO + 6NC breakers are available for customization;
b. Utilization category: AC-15, DC-13;
c. Ratings of auxiliary contact
Rated voltage
Us (V)
AC 230V/400V
DC220V
11.5 Doorframe
a. For the purpose of enclosure;
b. Protection degree up to IP40.
Rated heating
current Ith (A)
6
Rated control
capacity
300 VA
60 W
11.6 Mechanical interlock
a. For the interlock of two circuit breakers;
b. The suitable distances between two breakers are: horizontal interlock, 2000 mm; vertical interlock, 900 mm.
.38.

11. Overall and Mounting Dimensions & holes dimensions of the doorframe
.39.
Circuit Breakers
11.1 Withdrawable version circuit breaker, Inm=2000A.
188.5
146.5 102.5
D
A
280
523
224 93
11.2 Fixed version circuit breaker, Inm=2000A
188.5
A
D
473
11.3 Fixed version circuit breaker, Inm=4000A
280
D
A
280
188.5
123.8
523
H
H
174 93
H
200 117
289
535
256
443
302
585( 3200A)
535(
2500A)
94
92
5.5 37 64
55
59
55
55
5.5 37 64
3-pole
4-pole
In(A)
400~1000
1250~2000
3-pole
4-pole
In(A)
2000~2500
3200
4000
3-pole
4-pole
A
381
471
A
344
434
A
612
712
D
300
390
H(mm)
10
16
D
309
459
H(mm)
16
20
30
D
534
634

11.4 Withdrawable version circuit breaker. 4000A.
D
A
145.8
11.5 Hole dimensions of doorframe
a. Fixed version doorframe
10-5 52
19.5
underside of breaker
120.5 120.5
19.5
19.5
280
202
188.5
111
111
294
A
111
Center of right side board
installation hole of breaker
473
Inm
2000A
4000A
117
150
A(mm)
219
240
256
493( 3200A)
443( 2500A)
59
3-pole
4-pole
b. Withdrwable version doorframe
436
360
120 120
120.5 120.5
19.5
11
202
19.5
14-5 B
underside of breaker
12. Wiring
The withdrawable version circuit breaker is equipped with 40 connection terminals.
12.1 Wiring diagram of withdrawable version breaker with pre-energy storage operation
US1
K1
FU
SB2
71 72 73 74 75
K1
DF
DT
FD
K1
XK
K1
93 94
M
76
DF
H
SB1 SB3 Us2 Us4
95
77 78 79 80
F
Q1
Time delay
device
Q2
SB4
Auxiliary contact
Us3
+ -
55
294
52
51
Center of right side board
installation hole of breaker
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
Grounding failure alarm
92
Overload alarm
Short-circuit alarm
81 82 3 84 85 86 87 88
Common terminal
Intelligent controller
89 90
In(A)
2000~2500
3200
4000
91
XK
A
600
700
H(mm)
16
20
30
D
575
675
Inm
2000A
4000A
Pre-stored indicate
92
B(mm)
197
218
.40.

.41.
Circuit Breakers
12.2 Wiring diagram of withdrawable version breaker without pre-energy storage operation
Us1
The fixed version (2000A, 4000A) circuit breaker is equipped with 36 connection terminals.
12.3 Wiring diagram of fixed version breaker with pre-energy storage operation
Us1
FU
K1
SB2
SB1
Us2 Us4
65 66 67 68 69 70 71 72 73 74 75 76
12.4 Wiring diagram of fixed version breaker without pre-energy storage operation
Us1
FU
SB3
SB4
Us3
+ -
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
K1
DF
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92
DF
DF
XK
K1
SB1
XK
K1 K1 K1
FU
DT
K1
M
K1
M
DF
SB3
DF
F
Us2 Us4
F
Q1
Time delay
device
Q2
Q1
Time delay
device
Q2
SB4
Us3
+ -
93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
K1
41
DF
K1
SB1
Auxiliary contact
Auxiliary contact
SB4
65 66 67 68 69 70 71 72 73 74 75 76
Grounding failure alarm
Overload alarm
Short-circuit alarm
DF
Common terminal
Intelligent controller
Grounding failure alarm
Overload alarm
Short-circuit alarm
Common terminal
Intelligent controller
Us3
+
-
42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
XK
K1
K1
M
SB3 Us2 Us4
DF
F
Q1
Time delay
device
Q2
Auxiliary contact
Grounding failure alarm
Overload alarm
Short-circuit alarm
Common terminal
Intelligent controller
DF
DF
DF
XK
Pre-stored indicate

Symbol
SB1
SB2
SB3
SB4
Us1
Us2
Us3
Us4
M
DT
DF
Q1
Q2
F
K1
XK
FU
Illumination
Connected by user(broken line)
Connected by manufacturer(real line)
Pre-stored energy pushbutton
ON pushbutton
OFF pushbutton
Emergent OFF pushbutton
Power supply for motor and closing release
Power supply for shunt release
Power supply for intelligent controller
Power supply for undervoltage release
Electric motor
Closing release
Auxiliary contact
Under voltage time-delay release
Under voltage instantaneous release
Shunt release
Relay
Change-over switch
Fuse (10A)
Secondary connecting terminal
Note
Prepared by the user
Prepared by the user
Prepared by the user
Prepared by the user
Power conherence
Prepared by the user
Note:
# # # #
a. " " indicates that if the control voltage is DC, terminals 83 -84 (or 53 -54 ) should be connected the output of the power
module. It is strictly forbidden connected to the AC power supply.
# # # #
b. SB4 (Emergent pushbutton) is for user breaking breaker under emergency.81 -82 (or 51 -52 ) are connected by manufacturer
before leaving factory. User should disconnect these terminals before connecting NC pushbutton.
# # # # # # # #
c. 86 -89 (or 56 -59 ) are the output-signal terminals of grounding failure alarm; 87 -89 (or 57 -59 ) are the output-signal
# # # #
terminals of overload alarm;88 -89 (or 58 -59 ) are the output-signal terminals of short-circuit alarm;
.42.