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)
Inoperative time(h) | 1.30In(heat state)
Operative time(h) |
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)
Inoperative time(h) | 1.20In(heat state)
Operative time (h) | 1.50In(heat state)
Operative time (h) | 7.2In(cold state)
Operative time(h) |
10≤In≤225 | ≥2 | <2 | ≤4min
≤8min | 4s< Tp ≤10s
6s< Tp ≤20s | 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:
