1. Description Of NS Series Moulded Case Circuit Breaker:
NS series moulded case circuit breaker applies to breaking and making operation in AC 50/60Hz, rated operation voltage 690V or less and rated current up to 2000A circuit. It can distribute electric energy in circuit, work as the overload of wiring and power supply equipment, or as the protector of short circuit and under voltage. Additionally, this breaker can switch line and start motor unfrequnently. The other characters of the products are: small size, large contact spacings, high capability of break-make, and short arcing distance, this performance is better than that of CM1 series. The product complies with the standards of IEC90947-2.
2. Working Environment
♦ The altitude bellows 2,000m;
♦ Circuit breaker may be used between -25℃ and +70℃. For temperatures higher than 40℃ (65℃ for circuit breakers used to protect motor feeders), devices must be derated;
♦ It can withstand the impact from humid air, salt spray, oil mist and mold;
♦ It should be installed in places with no danger of explosion, no conductive dust, and no substance enough to corrode metal or damage the insulation;
♦ In places with no rain and snow erosion;
♦ Pollution degree 3;
♦ Installation category III.
3. Technical Data Of NS Series MCCB
NS/ NSX Type
Rated insulating voltage (V)
Rated operating voltage (V)
Rated ultimate short circuit breaking capacity Icu (KA) at 380/ 415V
Rated servies short circuit breaking capacity Ics at 380/ 415V (KA)
690 and below
1. The N-pole breaker has no protection which closing and opening with the other three poles.
2. The type of thermal magnetic for NS-400/630 has no four poles.
1). Overload protection with adjustable threshold, as defined by IEC60947-4 (2) tripping class 10A,10 and 20.
2). Short-circuit protection with adjustable threshold (6...13xIr).
3). Phase failure protection (built-in electronic release: operates unbalanced single-phase currentat 40% and more than ) (tripping time delay 4s±10%), as defined by IEC60947-4.1
4). Load indication: Flashing more than Ir setting threshold.
5). Fault indication.
LEDs indicates the type of fault that caused tripping;
Overload (LT protection) or abnormal component temperature (>Ir);
Short-circuit (ST or instantaneous protection) (>Im);
Phase failure (right LED);
Microprocessor malfunction ( (>Ir) (>Im) and phase failure LEDs all go on)
Battery powered. Spare battery are supplied in an adapter box. When a fault occurs, the LEDindicating the type of fault, lights for about 10 minutes. The information is however stored inmemory . The LED can be illuminated by pressing the test pushbutton. The LED automaticallygoes off and the memory is cleared when the circuit breaker is reset.
TM thermal release (from 16 to 250A)
STR22SE electronic release (from 40 to 250A)
STR223E electronic release (from 250 to 630A)
Rated operating voltage
Shunt release (MX)
Rated operating voltage
Auxiliary contact (OF)
Circuit breaker may be mounted vertically, horizontally or flat on their back without any derating of characteristics.
Q: When I can receive quotation and detail information after send the enquiry?
A: Reply will be sent in 24hours.
Q: What is the lead time?Because I really need them is urgently?
A: Samples are 3-5 days. Bulk order will take15-21 days.
Q: If I want to release order, what's the payment method you accept?
A: We accept T/T, Paypal, Western union, L/C, Trade Assurance.
Q: Can I have a sample for testing?
A: Yes, we can offer free sample, but you should pay for the shipping cost.
Q: Can I add my logo on the products?
A: Yes, OEM and ODM are available for us.
Q: What about after-service?
A: We will send you the free spare parts if the problems caused by us. If the products cannot be repaired, we will send you new free quantity together with next order.
Q: How aoubt inspection procedures for products?
A: All the products will be 100% checked before the shipment.
Q: Are you a factory or trading company?
A: We are a factory, we can guarantee our price is first-hand, low price and high quality.
7. After Sales Service:
We Pay high Attention To Your Feed back after receive the goods.
We Provide 24 months warranty after goods arrive.
We Positively Revert Your Complain Within 48hours.
8. Professional Sales:
We value every Inquiry Sent To Us, Ensure Quick Competitive Offer.
We Cooperate With Customer To Bid Tenders. Provide all Necessary Documents.
We Are A Sales Team, With All Technical Support From Engineer Team.