EKF VA-99M EKF User manual

TECHNICAL MANUAL
Molded case circuit
breakers VА-99М EKF

2
1 DESCRIPTION
The molded case circuit breaker VA-99M EKF is designed for infrequent routine
close/open operations and overload/short-circuit protection to be used in
electrical installations for residential and civil engineering, industrial facilities,
power substations, electrical distribution points, panel electrical equipment at
rated operating voltage up to 400 V AC at 50 Hz under currents from 16 to 1600
Amps.
The molded case circuit breakers comply with the requirements
of IEC 60947-2:2016.
2 DESIGN AND OPERATING PRINCIPLE
The molded case circuit breaker (MCCB) VA-99M is a monoblock consisting of
a base and a cover with a window for the operating handle and a window for
pressing the push-button "TEST" to test the tripping mechanism.
The base is made of thermal-resistant, ame-retardant ABS plastic and is a
supporting structure for connecting terminals, xed power contacts with an
arc fault protection system, a control mechanism with a system of movable
contacts, electromagnetic and thermal trip units. The bimetallic strip executes
thermal protection. The trip units have factory settings and are non-adjustable.
The housing cover is made of thermal-resistant ABS plastic, covers the entire
mechanism and protects personnel against electric shock when operating the
circuit breaker.
The control mechanism is based on the break lever principle and has a strong
return spring to ensure quick tripping. The arc fault protection system consists
of equidistant steel plates that direct the gas ow into an outlet window enclosed
by a perforated wall, which ensures optimum discharge and dissipation.
However, when the the molded case circuit breakers are installed in conned
space of the switchgear, arc products can be discharged if the overcurrent
protection is triggered.
The motor mechanism has manual mechanical and electrical remote control
to ensure trouble-free operation, even in case of power disconnection. The
front panel features an indicator of the motor mechanism status and a manual/
automatic switch.
WARNING! When the switch is in the "automatic" position, the extended rotary
handle is disabled. The wiring diagram is located on the left side of the motor
mechanism.
The MCCB VA-99M power supply can be connected from both xed and movable

3
contact sides, i.e. connection is possible from the top and bottom of the circuit
breaker.
WARNING! The operating handle of the molded case circuit breaker has three
positions "ON", "OFF" and "TRIP". To switch on the MCCB after tripping, move
the operating handle from the intermediate position to the "OFF" position and
then to the "ON" position.
INTERNAL ARRANGEMENT
1. Housing made of thermal-resistant,
ame-retardant ABS plastic
2. Connecting terminals
3. Fixed power contacts
4. Movable contacts
5. Insulation rail
6. Flat rail
7. Operating handle
8. Adjustable screws
9. Arc chute
3 TECHNICAL DATA
Type code
VА99М/XXX XXXA XP
Molded case circuit breaker VA-99M
Maximum rated current (housing) Inm, А
Rated tripping current, A
Number of poles

4
Main technical data are given in tables 1-5.
Table 1 - Technical data of VА-99М 63, VА-99М 100, VА-99М 250
Parameters
Values
  
Rated operating
voltage Ue, V
АС
400 V
DC
250 V
АС
400 V
АС
690 V
DC
250 V
АС
400 V
АС
690 V
Ultimate short-circuit
breaking capacity
Icu, kА 25 10 35 10 10 35 10
Service short-circuit
breaking capacity
Ics, kА 18 6 26 5 6 25 5
Rated currents In, А
16, 20, 25,
32, 40,
50, 63
16, 20, 25, 32, 40, 50,
63, 80, 100, 125
100, 125, 160, 200,
225, 250
Min. mechanical
endurance, O-C cycles 7000 7000 7000
Min. electrical
endurance, O-C cycles 2000
Rated peak short-
circuit current
Icm, kA 2,1хIcu
Rated insulation
voltage Ui, V 800
Utilization category
according to
IEC 60947-2:2016 А
Type of trip unit Thermal-magnetic
Set point
of electromagnetic
trip unit 10хIn
Number of poles
(standard) 3P

5
Parameters
Values
  
Power consumption, W 25 25 70
Protection degree IP30
Operating
temperature, °C from – 25 to + 40
Weight, kg 1 1,25 2
Min. service life, years 10
Table 2 - Technical data of VA-99М 400, VА-99М 630, VА-99М 800
Parameters
Values
  
Rated operating voltage Ue, V АС
400 V АС 690 V АС 400 V АС 690 V АС 400 V АС 690 V
Ultimate short-circuit breaking
capacity Icu, kА 42 15 50 15 50 35
Service short-circuit breaking
capacity Ics, kA 31,5 8 35 8 30 15
Rated currents In, А 250, 315, 400 400, 500, 630 630, 800
Min. mechanical endurance, O-C
cycles 4000 4000 4000
Min. electrical endurance, O-C cycles 2000
Rated peak short-circuit current, kА 2,1хIcu 2,2хIcu
Rated insulation voltage Ui, V 800
Utilization category according
to IEC 60947-2:2016 А
Table 1 continued

6
Parameters
Values
  
Type of trip unit Thermal-magnetic
Set point of electromagnetic trip unit 10хIn
Number of poles (standard) 3P
Power consumption, W 85 100 160
Protection degree IP30
Operating temperature, °C from – 25 to + 40
Weight, kg 5,75 8,25 24,6
Min. service life, years 10
* Motor mechanism 230V AC VA-99M 800 EKF (mccb99m-a-135) shall
not be used with molded case circuit breaker VA-99M 800/1000A 3P 50kА
EKF (mccb99-800-1000 m).
Table 3 - Technical data of VA-99M 1250, VA-99M 1600
Parameters
Values
 
Rated operating voltage Ue, V АС
400 V АС 690 V АС 400 V АС 690 V
Ultimate short-circuit breaking capacity Icu, kА 35 25 35 25
Service short-circuit breaking capacity Ics, kA 35 12,5 35 12,5
Rated currents In, А 800, 1000,
1250 1600
Table 2 continued

7
Table 3 continued
Parameters
Values
 
Rated operating voltage Ue, V АС
400 V АС 690 V АС 400 V АС 690 V
Min. mechanical endurance, O-C cycles 2500 2500
Min. electrical endurance, O-C cycles 1500
Rated peak short-circuit current Icm, kA 2,2хIcu
Rated insulation voltage Ui, V 800
Utilization category according
to IEC 60947-2:2016 А
Type of trip unit Thermal-magnetic
Set point of electromagnetic trip unit 10хIn
Number of poles (standard) 3P
Power consumption, W 160 160
Protection degree IP30
Operating temperature, °C from – 25 to + 40
Weight, kg 26,8
Min. service life, years 10

8
Parameters
Values














Rated
current In, А 63 100 250 400 630 800 1250
Rated
insulation
voltage Ui, V 800 800 800 800 800 800 800
Rated
impulse
voltage,
Uimp, kV
8
Rated
operating
voltage Ue, V 400
Ultimate
short-circuit
breaking
capacity
Icu, kA
50 50 50 65 65 75 65
Service
short-circuit
breaking
capacity
Ics, kА
35 35 35 42 42 50 50
Set point
of thermal
protection
current
Ir1, A
32-63 63-100 100-
250 160- 400 252- 630 630- 800 850-1250
Rated
short-time
withstand
current
Icw, kA
1,2
t=0,5 c 1,2 t=0,5 c 1,2 t=0,5 c 5 t=1 c 8 t=1 c 10 t=1 c 20 t=1 c
Utilization
category B
Trip unit Electrnonic
Table 4 - Technical data of VA-99M with electronic trip unit

9
Parameters
Values














Min.
mechanical
endurance,
O-C cycles
8500 8500 7000 4000 4000 2500 2500
Min. electrical
endurance,
O-C cycles 1500 1500 1000 1000 1000 500 500
Number of
poles 3Р
Protection
degree IP30
Operating
tempera-
ture, °C from – 5 to + 40
Min. service
life, years 10
Table 4 continued

10
IR (A) - Set point of overload protection tripping, A. Setting values
for each dimension are shown in Table 4.
Kt1 (s) - Time delay of overload current tripping for current 2Ir1, s.
Possible setting is 12-100 s.
Isd (xIR) – Set point of short-circuit current protection tripping is set relative to
the preset Ir1. The switch has 10 positions (2-12xIr1).
Ktsd (s) - Time delay of short-circuit current tripping, s. Possible setting is
0.06-0.3s. The function is available when any time t2 is set except off.
Ii (xIR) - Set point of instantaneous short-circuit current protection is set
relative to the preset Ir1. The switch has 10 positions (4-14xIr1).
IRO (xIR) – Set point of overload alarm current is set relative to the preset Ir1,
it does not trip the circuit breaker. The switch has 8 positions (0.7-1xIr1).
Description of the electronic trip unit for VA-99M
0.65 0.7
0.8
0.9
1.0
1.0
0.4
0.5
0.55
0.6
IR (A) Kt1 KtsdIsd (
+
IR) Ii (
+
IR) IRO (
+
IR)
OFF
12
60
100
150
56
7
8
10
12
2
2.5
3
4910
11
12
14
OFF
4
6
7
8
.85
.9
.95
1
1
1
1
.7
.75
0.8
OFF
.06
0.1
0.2
0.3
Table 5.1 - Kt1 Settings
Reverse delay
time (s)
(2Ir1)2
I2t1
T=
(Isd>I>Ir1)
Kt1 (s)
Encoder settings 12 60 80 (100)
100
(150)
E.g.: 2Ir1 In≤250
(T) Tripping time
12 60 80 100
OFF
(without
protec-
tion)
E.g.: 4Ir1 3 15 20 25
E.g.: 2Ir1 In≥400
(T) Tripping time
12 60 100 150
E.g.: 4Ir1 3 15 25 37.5
Error ±20%

11
Table 6 - Technical data of VA-99M with electromagnetic trip unit
Parameters
Values
   
Rated operating
voltage Ue, В DC
250 V АС 400 V АС 690 V DC 250 V АС 400 V АС 690 V АС 400 V АС 690 V АС 400 V АС 690 V
Ultimate short-
circuit breaking
capacity Icu, kА 10 35 10 10 35 10 42 15 35 30
Service short-circuit
breaking capacity
Ics, kA 6 26 5 6 25 5 31,5 8 35 15
Rated currents In, А 32, 63, 100, 125 160, 250 400 630
Min. mechanical
endurance, O-C
cycles 7000 7000 4000 4000
Min. electrical
endurance, O-C
cycles 2000
Table 5.2 - Ktsd Settings
Action
0.9
Isd~1.1Isd
Take action
during
≤0.9 Isd no action
>1.1Isd action
Fixed time
characteristics
I>1.5Isd
& I<Ii
Encoder settings
tsd (s) 0.06 0.1 0.2 0.3
≥1.1 Isd
T
0.06 0.1 0.2 0.3 OFF
(without
protec-
tion)
Error ±0.02 ±0.03 ±0.04 ±0.06
Reverse time
functions
I>Isd
&
I≤1.5Isd
≥1.1 Isd T
(1.5Isd)2
tsd
I2
T=
Error ±20%

12
Table 6 continued
Parameters
Values
   
DC
250 V АС 400 V АС 690 V DC 250 V АС 400 V АС 690 V АС 400 V АС 690 V АС 400 V АС 690 V
Rated peak
short-circuit
current Icm, kA 2,1xIcu 2,2xIcu
Rated insulation
voltage Ui, V 800
Utilization category
according to
IEC 60947-2:2016 A
Type of trip unit electromagnetic
Set point
of electromagnetic
trip unit 10xIn
Number of poles
(standard) 3P
Power
consumption, W 25 70 85 160
Protection degree IP30
Operating
temperature, °C from – 25 to + 40
Weight, kg 1,25 2 5,75 24,6
Min. service life,
years 10

13
TRIPPING CHARACTERISTICS
1.05
1.31 2 5 10 12 20 30 I/Inom
Время срабатывания (сек)
Кратность номинального тока
t (мин)
0.2
0.5
1
10
5
2
100
50
20
1000
500
200
0.01
0.001
0.02
0.05
5
2
1
10
10000
5000
2000
50
150
20
100
3 4 6 8
0.1
1
23
Tripping curve of VA-99M 63
Table 7.1 - Values to test VA-99M 63 thermal trip units
 Tripping time, s Result
2*In ≤ 300 MCCB tripping
4*In ≤ 170 MCCB tripping
Tripping
characteristics of the
molded case circuit

In the diagrams, areas
1, 2, 3 have meaning:
1 - "cold" tripping area
of thermal trip unit;
2 - "hot" tripping area
of thermal trip unit;
3 - tripping area of
electromagnetic
trip unit.
Rated current ratio
Tripping time (sec)
T (min)

14
1.05
1.31 2 5 10 12 20 30 I/Inom
Время срабатывания (сек)
Кратность номинального тока
t (мин)
0.2
0.5
1
10
5
2
100
50
20
1000
500
200
0.01
0.001
0.02
0.05
5
2
1
10
10000
5000
2000
50
150
20
100
3 4 6 8
0.1
1
23
Tripping curve of VA-99M 100
Table 7.2 - Values to test VA-99M 100 thermal trip units
 Tripping time, s Result
2*In ≤ 400 MCCB tripping
4*In ≤ 180 MCCB tripping
Rated current ratio
Tripping time (sec)
T (min)

15
1.05
1.31 2 5 10 12 20 30 I/Inom
Время срабатывания (сек)
Кратность номинального тока
t (мин)
0.2
0.5
1
10
5
2
100
50
20
1000
500
200
0.01
0.001
0.02
0.05
5
2
1
10
10000
5000
2000
50
150
20
100
3 4 6 8
0.1
1
23
Tripping curve of VA-99M 250
Table 7.3 - Values to test VA-99M 250 thermal trip units
 Tripping time, s Result
2*In ≤ 380 MCCB tripping
4*In ≤ 170 MCCB tripping
Rated current ratio
Tripping time (sec)
T (min)

16
1.05
1.31 2 5 10 12 20 30 I/Inom
Время срабатывания (сек)
Кратность номинального тока
t (мин)
0.2
0.5
1
10
5
2
100
50
20
1000
500
200
0.01
0.001
0.02
0.05
5
2
1
10
10000
5000
2000
50
150
20
100
3 4 6 8
0.1
1
2
3
Tripping curve of VA-99M 400
Table 7.4 - Values to test VA-99M 400 thermal trip units
 Tripping time, s Result
2*In ≤ 550 MCCB tripping
4*In ≤ 200 MCCB tripping
Rated current ratio
Tripping time (sec)
T (min)

17
1.05
1.31 2 5 10 12 20 30 I/Inom
Время срабатывания (сек)
Кратность номинального тока
t (мин)
0.2
0.5
1
10
5
2
100
50
20
1000
500
200
0.01
0.001
0.02
0.05
5
2
1
10
10000
5000
2000
50
150
20
100
3 4 6 8
0.1
1
23
Tripping curve of VA-99M 630
Table 7.5 - Values to test VA-99M 630 thermal trip units
 Tripping time, s Result
2*In ≤ 600 MCCB tripping
4*In ≤ 390 MCCB tripping
Rated current ratio
Tripping time (sec)
T (min)

18
1.05
1.31 2 5 10 12 20 30 I/Inom
Время срабатывания (сек)
Кратность номинального тока
t (мин)
0.2
0.5
1
10
5
2
100
50
20
1000
500
200
0.01
0.001
0.02
0.05
5
2
1
10
10000
5000
2000
50
150
20
100
3 4 6 8
0.1
1
2
3
Tripping curve of VA-99M 800 (1600)
Table 7.6 - Values to test VA-99M 800 (1600) thermal trip units
 Tripping time, s Result
2*In ≤ 1000 MCCB tripping
4*In ≤ 390 MCCB tripping
Rated current ratio
Tripping time (sec)
T (min)

19
% номинального тока
t,
o
С
0 10 20 30 40 50 60
80
100
110
120
130
90
% номинального тока
t,
o
С
0 10 20 30 40 50 60
80
100
110
120
130
90
INFLUENCE OF THE AMBIENT TEMPERATURE
The devices shall be commissioned at normal operating ambient temperature.
The tripping time of the molded case circuit breaker is determined by its
tripping curve. The setting value of the overload protection (Ir) shall be adjusted
according to the diagrams below.
TEMPERATURE FACTOR
VА-99М 63
VА-99М 250 VА-99М 400
VА-99М 100
% номинального тока
t,
o
С
0 10 20 30 40 50 60
80
100
110
120
130
90
% номинального тока
t,
o
С
0 10 20 30 40 50 60
80
100
110
120
130
90
% rated current% rated current % rated current% rated current

20

WITH ELECTRONIC TRIP UNIT
% номинального тока
t,
o
С
0 10 20 30 40 50 60
80
100
110
120
130
90
% номинального тока
t,
o
С
0 10 20 30 40 50 60
80
100
110
120
130
90
VА-99М 630 VА-99М 800 (1600)
% rated current
Время срабатывания
0.01 sec
0.6 0.7 1 1.3 2 3 4 5 6 7 10 12 15 20 30 40 (хlr1)(A)
0.02 sec
0.05 sec
0.1 sec
0.2 sec
0.5 sec
1 sec
5 sec
10 sec
20 sec
30 sec
1 мин
2 мин
4 мин
6 мин
10 мин
14 мин
20 мин
30 мин
1 ч
2 ч
4 ч
150sec
110sec
80sec
60sec
12sec
0.3 0.06sec
0.2 0.04sec
0.1 0.03sec
0.06 0.02sec
t2
(2–12) Ir1
Long-term
overload
Ir2 10%
Long-term
overload
t1 20%
(12–150)sec
(4–16) Ir1 15%
Instantaneous
tripping Ir3
Tripping time
h
h
h
min
min
min
min
min
min
min
min
% rated current