300A 350A 400A MCCB Motor Short Circuit Protection Residential Circuit Breakers
300A 350A 400A MCCB Motor Short Circuit Protection Residential Circuit Breakers
The UKM30 series molded case circuit breaker is high-tech products in 21st century with advanced design, high performance, pleasant apprearance and delicate dimension.
Description:
UKM30 series molded case cicuit breaker is suitable for circuit AC 50Hz/60Hz, rated voltage up to AC660V, Rated operating current up to 250A. It features normal structure reliable performance, high breaking capacity, used for power distribution and protecting the circuit and electrical equipment
against overload and short circuit. It complies with standard of IEC 60947-2.
Specifications:
| Type | UKM30-400S | UKM30-630S | UKM30-800S | ||||
| Rated current In(A) | 250,300,350,400 | 400,500,630 | 630,700,800 | ||||
| Number of poles | 3 | 4 | 3 | 4 | 3 | 4 | |
| Rated voltage Ui(V) | AC690V | AC690V | AC690V | ||||
| Arc distance (mm) | ≤50 | ≤50 | ≤50 | ||||
| Rated ultimate short-circuit breaking capitily Icu/Ics(KA) | AC690V | 10/10 | 10/10 | 15/15 | |||
| AC400V | 70/70 | 70/70 | 70/70 | ||||
| AC230V | 100/100 | 100/100 | 100/100 | ||||
| Operational performance (times) | ON | 1000 | 500 | 500 | |||
| OFF | 4000 | 2500 | 2500 | ||||
| Dimensions (mm) | a | 140 | 185 | 210 | 280 | 210 | 280 |
| b | 257 | 275 | 275 | 275 | |||
| c | 103 | 103 | 103 | 103 | |||
| Weight(kg) | 5.5 | 7.5 | 10.9 | 14.2 | 11.4 | 15.7 | |
| Rated operation frequency | 60 | 20 | 20 | ||||
Protection Characteristic
The thermodynamic release of a circuit breaker provides the feature of inverse time-delay, while the magnetic release is the instantaneous operation as shown on table 2(distribution circuit breaker) and table 3 (motor protection circuit breaker).
Table 2
Rated current ofrelease (A) | Thermodynamic release( ambient temp ) | Operationalcurrent ofmagneticrelease (A) | |
1.05In(cold state) | 1.30In(heat state) | ||
10≤In≤63 | ≥1 | < 1 | 10In±20% |
225≤In≤630 | ≥2 | < 2 | |
100≤In≤800 | ≥2 | < 2 | 5In±20% |
Table 3
Rated current ofrelease (A) | Thermodynamic release( ambient temp ) | Operationalcurrent ofmagneticrelease (A) | |||
1.0In(cold state) | 1.20In(heat state) | 1.50In(heat state) | 7.2In(cold state) | ||
10≤In≤225 | ≥2 | <2 | ≤4min | 4s< Tp ≤10s | 12In±20% |
225≤In≤630 | |||||
Benefits
1.Reduce energy and operations costs
2.Improve power quality, reliability and uptime
3.Optimize equipment use
Applications
1.Building: Hotels, hospitals, offices and retalis
2.Data center and Networks
3.Industry: Mining and minerals, automotive, food and beverage and chemical industry
4.Energy and infrastructures: Airports, oil and gas, water, electrical energy and marine
Circuit breaker power loss:
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