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Scope of Application

DZ20 Molded Case Circuit Breaker (125A/150A/200A/350A/500A Circuit Breaker, hereinafter referred to as MCCB), its rated insulation voltage is 660V, AC 50Hz, rated voltage is 380V and below, and its rated current is 16A to 1250A. Generally for power distribution, Y, J-type circuit breaker of rated current of 225A and below and the frame of 400Y-type can also protect motor. Under normal circumstances, DZ20 MCCB can apply to infrequent conversion of circuits and infrequent starting of the motor.
DZ20 MCCB (125A/150A/200A/350A/500A Circuit Breaker) for distribution, distributes power in the distribution network, and can protect overload and short-circuit of circuits and power equipment.
DZ20 MCCB (125A/150A/200A/350A/500A Circuit Breaker) for motor protection in the distribution network can apply to starting and breaking in the running of squirrel-cage motor and overload, short-circuit protection of motor.
The series, the three-pole DZ20 MCCB of frame rated current of 100A to 630A also have transparent cover, the cover is made of polycarbonate material with new type, high temperature resistant and high strength. DZ20 MCCB can be judged on or off of the contact state directly, widely used in the construction site temporary electricity field.
Meet the standards: GB14048.2, IEC60947-2.

Model and meaning

Model Meaning Note:
A. Commonly used products without code; transparent cover products with "T";
B. Distribution circuit breaker without code; circuit breaker for motor protection with "2";
C. Handle direct operation without code; electric operation with P; the turning handle with Z (products of frame grade of 1250A without turning handle);
D. According to the rated ultimate short-circuit breaking capacity: Y-general type, J-higher type.

Overcurrent release Mode

Accessory Code

Accessory Name

Electromagnetic release Thermal magnetic release
Without accessories 200 300
Alarm contacts 208 308
Shunt release 210 310
Two sets of auxiliary contacts 220 320
Undervoltage release 230 33

Shunt release,

Two sets of auxiliary contacts

240 340

Shunt release,

Undervoltage release

250 350
Four sets of auxiliary contacts 260 360

Two sets of auxiliary contacts,

Undervoltage release

270 370
Shunt release, Alarm contacts 218 318

Two sets of auxiliary contacts,

Alarm contacts

228 328

Undervoltage release,

Alarm contacts

238 338

Shunt release,

Auxiliary contact,

Alarm contacts

248 348

Four sets of auxiliary contacts,

Alarm contacts

268 368

Undervoltage release,

Auxiliary contact,

Alarm contacts

278 378

Note:
A. The specifications listed in Table 1 shall be selected by the user as required, but shall not exceed the items specified in each box in Table 1 in a circuit breaker
B. Circuit breaker of frame grade of 100A, 225A, each set of auxiliary contacts are set as one normally open, one normally closed, each set of the rest of circuit breaker is composed of contacts set as two normally open, two normally closed;
C. Alarm contacts are set as one normally open, one normally closed; DZ20C-160 has no alarm contacts and electric rotation operating specifications, DZ20-1250 has no alarm contacts;
D. There are no specifications of 248, 278, 348, 378 in the frame grade of 100A, 225A;
E. Thermal magnetic release, is the release with magnetic release and thermal release;
F. There are no specifications of 230, 330, 238, 338, 250, 350, 270, 370 in DZ20J-1250.

Main technical parameters

Model Pole Rated operating voltage
Ue(V)
Rated insulation voltage
Ui(V)
Short circuit breaking capacity
kA(Valid values)
Rated current
In A
Operation cycle index Operating frequency
times/h
Flashover distance
mm
Icu/cosφ Ics/cosφ On-load No-load
DZ20Y-100 3P 380 660 18/0.30 14/0.30 16,20,32,40,50,63,80,100 1500 8500 120 80
DZ20J-100 3P 380 660 35/0.25 18/0.30 32, 40, 50, 63, 80, 100 1500 8500 120 80
DZ20Y-225 3P 380 660 25/0.25 19/0.30 125, 16, 180, 200, 225 1000 7000 120 80
DZ20J-225 3P 380 660 42/0.25 25/0.25 125, 160, 20, 225 1000 7000 120 80
DZ20Y-400 3P 380 660 30/0.25 23/0.25 250, 315, 350, 400 1000 4000 60 100
DZ20J-400 3P 380 660 42/0.25 25/0.25 250, 315, 350, 400 1000 4000 60 100
DZ20Y-630 3P 380 660 30/0.25 23/0.25 500, 630 1000 4000 60 100
DZ20J-630 3P 380 660 50/0.25 25/0.25 500, 630 1000 4000 60 100

Current setting value of circuit breaker short-circuit protection

Model For distribution For motor protection
DZ20Y.J-100 10In 12In
DZ20Y.J-225 10In 12In
DZ20Y-400 10In 12In
DZ20J-400 10In 12In
DZ20Y.J-630 10In 12In
DZ20Y.J-1250 7In 12In

Note: DZ20Y.J-100 circuit breaker, when In ≤ 40A, the instantaneous operating current value is 600A, non-operating current is 10In.

Protection characteristics of circuit breaker

Inverse time off characteristics of circuit breaker for distribution

No. Test current Setting current multiples Set time Initial state
In≤63A In>63A
1 Conventional non-tripping current 1.05In ≥1h ≥2h Cold
2 Conventional tripping current 1.30In <1h <2h Immidiately after the Test 1

Inverse time off characteristic of circuit breakers for motor protection

No. Test current Setting current multiples Set time Initial state
In≤63A In>63A
1 Conventional non-tripping current 1.0In ≥1h ≥2h Cold
2 Conventional tripping current 1.2In <1h <2h Immidiately after the Test 1

Shunt release:
Rated control power supply voltage: AC220V, AC380V.
Shunt releases shall be reliable to make the circuit-breaker trip at the rated control supply voltage of 70% to 110%.
Undervoltage release:
Rated operaing voltage: AC220V, AC380V.
When the voltage drops (or even slow down) to 70%~35% of the rated voltage range, undervoltage release should act, at less than 35% of the rated voltage release, undervoltage release should be able to prevent open circuit When the supply voltage is equal to or greater than 85%, the circuit-breaker shall be closed.
Alarm contact:
Rated operating voltage: AC220V.
Conventional heating current: 1A.
Auxiliary contacts: Install the undervoltage release and shunt release at different time, you can install the auxiliary contact. Rating value of auxiliary contact (see Table 6); making and breaking capacity (see Table 7); auxiliary contact has the same times of non-operating performance as circuit breaker, times of power-on operation is 6050 times, when the times of operating performance of circuit breaker is less than 6050 times, then the same as circuit breaker.

Table 6

Frame rated current Conventional thermal current(A) Rated operating current(A)
AC 380V DC 220V
400A and more 6 3 0.2
225A and less 3 0.4 0.14

Table 7

Use categories Making
I/Ie
Making
U/Ue
Making
cosφ
Making
T0.95ms
Breaking
I/Ie
Breaking
U/Ue
Breaking
cosφ
Breaking
T0.95
Operating frequency
(times/h)
Power - on time(S)
AC-15 10 1 0.3
1 1 0.3
120 0.05-2
DC-13 1 1
6xPe 1 1
6xPe 120 0.05-2

Note: In the table, 225A and below Pe = 30W, 400A and more Pe = 45W, Pe = Ue · Ie for the steady state power loss.

External accessories of the circuit-breaker

● The relevant parameters of electric operating mechanism and the total height H of circuit breaker with electric operating mechanism in Table 8.

Table 8

Model DZ20Y、J-100 DZ20Y、J-225 DZ20Y-400 DZ20J-400
DZ20Y、J-630
DZ20Y、J-1250
Height (H) 175 220 230 245 275
Structural style Electromagnet Motor
Voltage specifications AC50Hz、220V、380V

Note: After the tripping of the circuit-breaker with electric operating mechanism, the electric operating mechanism must make the circuit-breaker buckle again before closing!

● Installation dimensions of manual operating mechanism are shown in Table 9

Model DZ20Y、J-100 DZ20Y、J-225 DZ20Y-400 DZ20J-400
DZ20Y、J-630
Installation dimensions H 50 85 75 77

X value of the operating

handle relative to the center

of the circuit breaker

0 0 0 0

Structural features

This series circuit breakers is based on Y-based products, consists of the insulation case, operating mechanism, the contact system and the release. The operating mechanism of the circuit breaker has the function of quickly closing and breaking the contacts, and the positions of "CLOSING", "OPENING" and "FREE RELEASE" are distinguished by the handle position.
J-type circuit breakers are derived from the Y-type basic products. J-type circuit breaker improve the structure of the Y-type circuit breaker contact, so that in the case of short circuit, before the mechanism action, the moving contact can be quickly disconnected to achieve the purpose of improving the making and breaking capacity.

Outline and installation dimensions

Model Outline dimension(mm)
W L H H1
DZ20Y-100 105 165 86.5 103
DZ20J-100 105 165 86.5 103
DZ20Y-225 10 256.5 105 142
DZ20J-225 109 256.5 105 142
DZ20Y-400 155 276 112 149.5
DZ20J-400 210 268 112 147
DZ20Y-630 210 268 112 150
DZ20J-630 210 268 112 150
DZ20J-1250 210 406 112 180
Model Wiring in front of the board
W1 L1 L2 H2 W2 L4 L5 H5 W3 LD
DZ20Y-100 35 - 215 26.5 26 69 28.5 4 - -
DZ20J-100 35 - 215 26.5 26 69 28.5 4 - -
DZ20Y-225 35 329 402 19.5 35 89 53 6.5 20 36.5
DZ20J-225 35 329 402 19.5 35 89 53 6.5 20 36.5
DZ20Y-400 51 391 450 32.5 52 88 72 5 28 330
DZ20J-400 70 378 425 21.5 62 90 55 5.5 40 315
DZ20Y-630 70 378 425 21.5 62 90 55 5.5 40 315
DZ20J-630 70 378 425 21.5 62 90 55 5.5 40 315
DZ20J-1250 70 548 588 26 78 100 143 16 45 515

Model Wiring on back of the board Installation dimensions(mm) Mounting screw size (recommended)
W1 L3 H3 H4 A B Φd
DZ20Y-100 35 147 55.5 55.5 35 126 5 M4X40
DZ20J-100 35 147 55.5 55.5 35 126 5 M4X40
DZ20Y-225 35 212.5 47 90 35 196.5 4.5 M4X40
DZ20J-225 35 212.5 47 90 35 196.5 4.5 M4X40
DZ20Y-400 51 247 80 125 51 240 7 M4X40
DZ20J-400 70 233 90 90 70 200 7 M5X45
DZ20Y-630 70 233 92 92 70 200 7 M5X45
DZ20J-630 70 233 92 92 70 200 7 M5X45
DZ20J-1250 70 375 - - 70 375 9 -
Rated Current(A) 16、20 32 40、50 63 80 100 125 160 180、200、225 250 315、350 400

Cross-sectional area

of conductor(mm²)

2.5 6 10 16 25 35 50 70 95 120 185 240
Quantity 1
Rated Current(A) 500 630 800 1000 1250

Cross-sectional area

of conductor(mm²)

30x5 40x5 50x5 60x5 80x5
Quantity 2

Keywords: DZ20 , 350A Circuit Breaker

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