DZ20 series plastic case circuit breaker

Product category:: Molded case circuit breaker
Product code:: P-274
Model:: DZ20

Function & Use (Application Scenarios)

Distribution appliances and plastic case circuit breaker products are mainly suitable for use (hereinafter referred to as circuit breakers). Their rated insulation voltage is 800V, AC 50Hz, rated working voltage is 400V and below, and their rated current ranges from 32A to 1250A. Generally used for power distribution, among which type C

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Model

DZ20

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Main Product Parameters

ClassificationswitchgearSecondary classificationMolded case circuit breaker

Product details

Function and use

DZ20 series plastic case circuit breaker (hereinafter referred to as circuit breaker) has a rated insulation voltage of 800V, AC 50Hz, a rated working voltage of 400V and below, and a rated current from 32A to 1250A. Generally used for power distribution, the rated current of type C is 160A, and the circuit breakers of type 630 and below can also be used to protect motors. Under normal circumstances, the circuit breaker can be used for infrequent switching of circuits and infrequent starting of motors respectively.

Detailed parameters

Parameter table 1

Parameter classification	Parameter item	Parameter value
3.1 Main technical parameters of the circuit breaker (see table 2)	Model	DZ20Y-100, DZ20C-160, DZ20Y-225, DZ20Y-400, DZ20Y-630, DZ20Y-1250
	Number of poles	3P
	Rated operating voltage Ue (V)	400, 400, 400, 380, 380, 380
	Rated insulation voltage Ue (V)	800
	Short circuit breaking capacity kA (effective value) Icu/cosΦ	18/0.30, 12/0.30, 25/0.25, 30/0.25, 30/0.25, 50/0.25
	Short circuit breaking capacity kA (effective value) Ics/cosΦ	14/0.30, 8/0.5, 19/0.30, 23/0.25, 23/0.25, 32.5/0.25
	Rated circuit breaker current In A	32, 40, 50, 63, 80, 100; 100, 125, 160; 125, 160, 180, 200, 225; 250, 315, 350, 400; 500, 630; 800, 1000, 1250
	Number of operating cycles	With load: 1500, 1000, 1000, 1000, 1000, 500; No load: 8500, 7000, 7000, 4000, 4000, 2500
	Operation frequency / hour	120, 120, 120, 60, 60, 20
	Arc distance mm	50, 50, 50, 100, 100, 120
3.2 Circuit breaker short-circuit protection current setting value (see table 3)	Model number	DZ20Y-100, DZ20C-160, DZ20Y-225, DZ20Y-400, DZ20Y-630, DZ20Y-1250
	Instantaneous operating current setting value of distribution circuit breaker Ii(A) and tolerance	In ≤ 40A: 500, ±20%; In> 40A: 10In, ±20%; 10In, ±20%; 10In, ±20%; 10In, ±20%; 7In,±20%
	Instantaneous operating current setting value Ii (A) and tolerance of circuit breaker for motor protection	In ≤ 40A: 600, ±20%; In>40A: 12In, ±20%; 12In, ±20%; 12In, ±20%; 12In,±20%; -
	Single-pole short-circuit protection current action setting value Ii(A)	For power distribution: In ≤ 40A: 700; In > 40A: 14In; For motor protection: In ≤ 40A: 850; In > 40A: 17In; For power distribution: 14In; For motor protection: 16In; For power distribution: 12In; For motor protection: 14In; For power distribution: 10In
	Tripping time (s)	<0.2
3.3 Circuit breaker protection characteristics
3.3.1 Inverse time limit breaking characteristics of distribution circuit breaker (see Table 4)	Serial number	1, 2
	Test current name	No tripping current is agreed, tripping current is agreed upon
	Setting current multiple	1.05In, 1.30In
	Appointed time	≥ 1h, <1h; ≥ 2h, <2h
	Initial state	Cold state, immediately following sequence number 1 Start after test
3.3.2 Inverse time limit breaking characteristics of circuit breaker for motor protection (see Table 5)	Serial number	1, 2
	Test current name	No tripping current is agreed, Agreed tripping current
	Setting current multiple	1.0In, 1.2In
	Appointed time	≥ 2h, <2h
	Initial state	Cold state, starting immediately after test number 1

Parameter table 2

Parameter classification	Parameter item	Parameter value
3.4 Shunt tripper	Rated control power supply voltage	AC220V, AC380V.
	When the rated control power supply voltage is between 70% and 110%, the shunt release should reliably trip the circuit breaker.
3.5 Undervoltage release	Rated working voltage	AC220V, AC380V.
	When the voltage drops (even slowly drops) to the range of 70%-35% of the rated voltage, the undervoltage release should operate. When it is lower than 35% of the rated voltage of the release, the undervoltage release should be able to prevent the circuit breaker from closing. When the power supply voltage is equal to or greater than 85%, it should be able to ensure that the circuit breaker is closed.
3.6 Alarm contact	Rated working voltage	AC220V, agreed heating current: 3A.
3.7 Auxiliary contact	Connected I/le	10
	Connected U/Ue	1
	Connected cosΦ	0.3
	On T0.95ms	1
	Off I/le	1
	Off U/Ue	1
	Break cosΦ	0.3
	Break T0.95	6×Pe
	Operating frequency (times/h)	120
	Power-on time (s)	0.05-2
3.8 External accessories of circuit breaker	Model	DZ20Y-100, DZ20C-160, DZ20Y-225, DZ20Y-400, DZ20Y-630, DZ20Y-1250
	Height H	152.5, 164.5, 230, 245, 275
	Structural form	Motor
	Voltage specification	AC50Hz, 220V, 380V
3.8.2 Manual operating mechanism installation dimensions	Model	DZ20Y-100, DZ20C-160, DZ20Y-225, DZ20Y-400, DZ20Y-630
	Installation dimensions H (mm)	60, 60, 68, 75, 77
	X value of the operating handle relative to the center of the circuit breaker	0, 0, 0, 0, 0
	Handle length L (mm)	65, 95

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