1250A Series Molded Case Circuit Breaker Type C MCCB Power Circuit
Breaker
Application
DZ20 series molded case circuit breaker andDZ20□W no-flashover circuitbreaker(hereinafterreferredtoascircuitbreaker)aresuitablefordistributingline of AC 50Hz (or 60Hz), ratedcurrent 1250A, rated insulation voltage 690Vand rated working voltage 380 (400)V or below,used to distribute electric energy and protect circuit and power equipment against overload,short circuit and under voltage. Hereinto, typeY, J, G circuit breakers of rated current 225Aand type Y circuit breakers of rated current400A and below also can be used to protectmotor. Under normal condition, they also canbe applied to switching circuit and starting themotor infrequently respectively. The products are in conformity with such standardsas GB 14048.2, GB 14048.4, IEC 60947-2 andIEC 60947-4.
Main Technical Data
1. Main technical parameters of circuit breaker
| Type | Rated frame current | Rated current | Power loss | Short circuit breaking capacity (time of effect) | Flashover distance |
| Fixing type | Insertion type | Ics/COS∅ | Ics/COS∅ |
| DZ20C-160 | 160 | 16,20,25,32,40,50,63,80,100,125,160 | 40 | 50 | 12/0.30 | 1 | 80 |
| DZ20Y-100 | | 16,20,25,32,40,50, 63,80,100 | 30 | 35 | 18/0.30 | 14/0.30 | |
| DZ20J-100 | 100 | 35 | 40 | 35/0.25 | 18/0.30 | 80 |
| DZ20G-100 | | 40 | 50 | 100/0.20 | 50/0.25 | |
| DZ20C-250 | 250 | 100,125,160,180,200,225,250 | 45 | 55 | 15/0.20 | / | 80 |
| DZ20Y-225 | | | 40 | 50 | 25/0.25 | 19/0.30 | |
| DZ20J-225 | 225 | 100,125,160,180.200,225 | 50 | 65 | 42/0.25 | 25/0.25 | 80 |
| DZ20G-225 | | | 60 | 80 | 100/0.20 | 50/0.25 | |
| DZ20C-400 | | | 65 | 80 | 20/0.30 | / | |
| DZ20Y-400 | 400 | 200,250,315,350,400 | 75 | 90 | 30/0.25 | 23/0.25 | 100 |
| DZ20J-400 | 85 | 110 | 42/0.25 | 25/0.25 |
| DZ20G-400 | | | 120 | 150 | 100/0.20 | 50/0.25 | |
| DZ20C-630 | | | 95 | 120 | 20/0.30 | / | |
| DZ20Y-630 | 630 | 400,500,630 | 105 | 130 | 30/0.25 | 23/0.25 | 100 |
| DZ20J-630 | | | 105 | 130 | 50/0.25 | 25/0.25 | |
| DZ20G-1250 | 1,250 | 630,700,800,1000,1250 | 240 | 300 | 65/0.20 | 32.5/0.25 | 120 |
2. Main technical parameters of control circuit
| Sort | Rated Working Voltage |
| AC 50Hz | DC |
| Release | Shunt release | Us | 230,400 | 24,110,220 |
| Under voltage release | Ue | 230, 400 | - |
| Electric mechanism | Us | 230, 400 | - |
3. Main technical parameters of auxiliary contact and alarm contact
| Conventional thermal current | Rated insulation Voltage | Rated working current | Rated frame current |
| AC400V | DC220V |
| 1 | 400 | 0.3 | 0.15 | Used as alarm contact |
| 2 | 400 | 0.4 | 0.15 | <=250A |
| 3 | 400 | 3 | 0.2 | <=400A |
4. Short-circuit Protection
| Type | distribution protection | motor protection | Accuracy of setting value | Conventional time | Intiap state |
| DZ20Y.J.G, YW,JW-100 | 10ln | 12ln | ±20% | <0.2 Trip | Cold state |
| DZ20Y.J.G,YW,JW-225 | 5ln,10ln |
| DZ20Y,YW-400 | 10ln |
| DZ20J.G, JW-400 | 5ln,10ln | - | ±20% | <0.2 Trip | Cold state |
| DZ20Y.J, YW, JW-630 |
| DZ20J-800 | 5ln,10ln |
| DZ20J-1250 | 4ln,7ln |
5. Inverse time lag breaking characteristics of circuit breaker for
distribution protection
| Name of test current | Current setting multiple | Conventional iime | Intiap state | Ambient temperature |
|
| 1.01ln≤ | 63A<ln | 225A<ln |
| 100A | ≤225A |
| Conventional non-tripping current | 1.05ln | ≥1h | ≥2h | Cold state | +30℃ |
| Conventional tripping current | 1.30ln | <1h | <2h | Hot state |
| Returnable time | 3.0ln | Returnable time | Cold state |
| 5s | 8s | 12s |
6.Inverse time lag characteristics of circuit breaker for motor
protection
| Name of test current | Current setting multiple | Conventional time | Intiap state | Ambient temperature |
| Conventional non-tripping current | 1.01 In | ≥2h | Cold state | +40℃ |
| Conventional tripping current | 1.2ln | <2h | Hot state |
| 1.5ln | 4min | Hot state |
| Current of returning characteristic | 7.2ln | 4s<TP≤10s | Cold state |
External And Installation Size
advantage
Our MCCBs provide you unmatched circuit protection in alternative
energy, commercial, industrial, mining, and military applications
when protecting conductors against overloads and short circuits.
These circuit breakers are applied in panelboards, switchboards,
motor control centers, control panels, combination starters,
individual enclosures, and bus duct plug-in units.
The breakers according to the rated maximal value to short- circuit
breaking ability (Icu), would be classified four kinds types C
(basic type), L (typica1 type), M (second high breaking type) and H
(high breaking type). The breakers are of the following
characteristics: compact size, high breaking ability, short
arc-over distance (some of the "0" arc-over distance) and shake
proof. They also undergo the tests of nuclear industry conditions
(1E grade) and ship conditions, and become the only product using
in nuclear industry base among the same products made in the
country, further more become the ideal products applied on land or
ships.
Matters need attention
Normally, we will provide the most suitable shipment method for
you. If the quantity is few, the goods will be sent by express when
the payment is clear. Also, we can transport the goods by air or by
sea, just according to your demand
profile
Baikong electric was born and developed wellSichuan Baikong
Electrical Technology Co., Ltd is a complete set of high and low
voltage power distribution equipment automation equipment, set
production, research and development and sales Import and export
services and other integrated enterprises, the company is
headquartered in Pengzhou Industrial Park, Chengdu City.The
company's main products are box-type substation Medium and high
voltage power transmission and distribution equipment, low voltage
power distribution equipment, fire electrical equipment,
intelligent industrial electrical equipment, new energy and energy
storage electrical equipment, metering and protection power
distribution equipment, high and low voltage complete switchgear,
high voltage ring network cabinet, cable branch box,SF6 inflatable
cabinet, etc.
Our MCCBs provide you unmatched circuit protection in alternative
energy, commercial, industrial, mining, and military applications
when protecting conductors against overloads and short circuits.
These circuit breakers are applied in panelboards, switchboards,
motor control centers, control panels, combination starters,
individual enclosures, and bus duct plug-in units.
