NBSM30 Molded Case Circuit Breaker up to 800A

Basic Information
Place of Origin: CHINA
Brand Name: NBSe
Certification: CE,ISO9000
Model Number: NBSM30
Minimum Order Quantity: 50pcs
Price: Negotiable
Packaging Details: Export Carton
Delivery Time: 10-20day
Payment Terms: L/C, T/T, Western Union
Supply Ability: 10,000pcs per month
Detail Information
Material: ABS, COPPER Poles Number: 4 Pole
Rated Frequency: 50/60Hz Standard: IEC60947-2
Rated Current: 50-100A Type: Moulded Case,Magnetic
Rated Voltage: AC230/440/660 Product Name: Mccb Moulded Case Circuit Breaker
Breaking Capacity: 25~100KA Installation: Fixed And Plug-in,Easy,Easy To Install
High Light:

adjustable circuit breaker


high voltage circuit breaker

Product Description

NBSe NBSM30-100/4300 mold case circuit breaker,thermal magnetic circuit breaker


1. Product Description


NBSM30 moulded case circuit breaker series is one of products developed and manufactured by adopting international advanced technology. It's supplied with rated insulation voltage 800V(NM1-63 is 500V)and rated operating voltage is 690V (or below,NM1-63 is 400V),rated operating current up to 1250A for inf requent changing over and starting of the motors. The KCM1 series is suited to vertical installation and horizontal installation. The temperature is not higher than 40 ℃ and not less than -5℃.


2. Technical Data


Type Rated Current (A) Pole number Rated Insulating Voltage(V) Rated operating voltage(V) Ultimate short circuit breaking capacity(KA) Servies short circuit breaking capacity(KA) Utilization category
NBSM30-63L (6),10,16,20,25 ,32,40,50,63 3 AC 500V 400V 25 18 A
NBSM30-63M 50 35
NBSM30-100L (10),16,20,25,32,40, 50,63,80,100 AC 690V 35 22
NBSM30-100M 50 35
NBSM30-100H 85 50
NBSM30-225L 100,125,160,180,200,000 4 35 25
NBSM30-225M 50 35
NBSM30-225H 85 50
NBSM30-400L 225,250,315,400 50 35
NBSM30-400M 65 42
NBSM30-630L 400,500,630 50 35
NBSM30-630M 65 42
NBSM30-630H 100 65
NBSM30-800M 630,700,800 3 70 50
NBSM30-800H 100 65
NBSM30-1250 80,010,001,250 65 32.5


Note: 6A without thermal protection
The N-pole of four-poles breaker is sited at the right side of the product has four types:
Type A: Without current trip-lease on N pole which making all the time, not closing and opening with the other three poles.
Type B: Without current trip-release on N pole which closing and opening with the other poles.
Type C: With current trip-release which closing and opening with the other three poles.
Type D: With current trip-release which making all the time not closing and opening with the other three poles.


3. 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).


Rated current of release (A)

Thermodynamic release

( ambient temperature )

land +40°C marine +45°C



of magnetic

release (A)

1.05In(cold state)

Inoperative time(h)

1.30In(heat state)

Operative time(h)

10≤In≤63 ≥ 1 < 1 10In±20%
63≤In≤100 ≥ 2 < 2
100≤In≤800 ≥ 2 < 2 5In±20% 10In±20%


Rated current Thermodynamic release ( ambient temperature ) land +40°C marine +45°C

Operating current

of magnetic release (A)

of release (A) 1.0In(cold state) non-trip time(h)

1.20In(heat state)

trip time (h)

1.50In(heat state)

trip time (h)

7.2In(cold state)

trip time(h)

10 ≤ In ≤ 225 ≥ 2 <2 ≤ 4min 4s < Tp ≤ 10s 12In±20%
225 ≤ In ≤ 630 ≤ 8min 6s < Tp ≤ 20s




Founded in 1993, Wenzhou New Blue Sky Electrical Co., Ltd(Former Yueqing Blue Sky Electrical Co., Ltd)is situated in beautiful Wuniu Industrial Park, Wenzhou City at the bank of Oujiang River; it is a high and new-tech enterprise professionally researching, developing, and manufacturing miniature circuit breakers and residual current circuit breakers. The company has been awarded honors such as “AAA-grade Export Credit Enterprise”, “Advanced Enterprise”, “Star Enterprise”, and “Patent Model Enterprise” in successive years. At present, the company is abundant in financial resources and advanced in technologies, possessing more than 70 domestic and international patents; it has over 10,000 square meters of standard workshops. The company employs more than 150 people (25 technicians and senior engineer;). In addition, the company has deployed a batch of advanced manufacturing devices and precise detecting and inspection instruments. It established the Technology Research and Development Center in 2005, which have been authorized as “Enterprise technology research and development center of Zhejiang Province” and “Patent demonstration enterprise in Zhejiang Province” by People's Government of Zhejiang Province;. possessing strong strength in technology research and development.

Over the past two decades, under its operation philosophy of “integrity, innovation, competitive products, and fair price” and production philosophy of “one false step will make a great difference”.


Our Services

(1) Warranty ( 24 months warranty )

1. The warranty starts from the delivery date from our factory;

2. During the warranty, any defective product will get repaired or replaced for free ;

3. It is beyond the warranty as the products breaked by the violence , the carelessness or repaired , altered without authorization.


(2) Lead Time

1. Sample orders will be delivered from our factory within 7 working days.

2. General orders will be delivered from our factory within 7-15 working days.

3. Bulk orders will be delivered from our factory within 25 working days at most


(3) Shippment

1. By EMS, DHL, FedEx, TNT, UPS or other express.

2. By our forwarding agent (by air or by sea).

3. By your own forwarding agent.

4. By domestic forwarding agents to any city in China


Contact Details

Phone Number : +8613587466174

WhatsApp : +8613587466174