M-NZS series plastic shell circuit breakerDetailed product description：

Scope of application
The M-NZS series plastic shell circuit breaker is one of the new types of circuit breakers developed by our company using advanced international technology. Its rated insulation voltage is 950V, suitable for AC 50Hz or (60Hz), rated working voltage of 690V and below, and rated working current of 12.5A to 630A. It is used to distribute electrical energy and is used for infrequent closing and opening under normal conditions. It also provides protection in case of overload or undervoltage of lines and equipment. Circuit breakers with rated shell level current of 400A or below can also be used for infrequent starting, operation interruption, and protection in the event of motor overload, short circuit, and undervoltage of squirrel cage motors. The product complies with GB14048.2 and IEC60947-2 standards.

Model and meaning

Note: * Circuit breakers for power distribution have no code; The circuit breaker for protecting the motor is represented by "2".
*The handle can be operated directly without a code; Electric operation function "P" represents; Rotate the handle with "Z" to indicate
*Rated short-circuit breaking capacity level: N-standard type H-high breaking type L-ultra-high breaking type

classification
1. Divided by installation method: vertical installation, horizontal installation;
2. Divided by the purpose of the circuit breaker: distribution protection type, motor protection type;
3. Divided by wiring method: front board wiring, back board wiring, plug-in wiring;
4. Divided by operation mode: direct operation of the handle, external rotation of the handle operation, and electric operation;
5. According to the type of release, there are only momentary action release (electromagnetic release), thermal+electromagnetic release (compound), and electronic release;
6. Divided by number of poles: two poles, three poles, four poles;
There are four types of neutral pole (N-pole) in a four pole circuit breaker:
Type A: The N pole does not have an overcurrent release installed, and the N pole is always connected and does not open or close together with the other three poles;
Type B: The N-pole does not have an overcurrent release installed, and the N-pole is connected and disconnected together with the other three poles;
Type C: The N-pole is equipped with an overcurrent release, and the N-pole is connected and disconnected together with the other three poles;
D-type: The N-pole is equipped with an overcurrent release, and the N-pole is always connected and does not open or close together with the other three poles;
The tripping characteristics of circuit breakers
The thermal release of the circuit breaker has inverse time limit characteristics; Electromagnetic release for instantaneous action (for power distribution) and (for motor protection)

Rated current of release device (A)	Thermal release device (ambient temperature+40 ℃)		Electromagnetic release action current (A)
	1.05In (cold state) inactive time (h)	1.30In (hot state) action time (h)
In≤63	≥1	<1	10In±20%
63＜In≤100	≥2	<2	10In±20%
100＜In≤630	≥2	<2	5~10In±20%

Rated current of release device (A)	Thermal release device (with an ambient temperature of+40 ℃ for land use and+45 ℃ for marine use)				Electromagnetic release action current (A)
	1.0In (cold state) Non action time	1.20In (hot state) Action Time	1.50In (hot state) Action Time	7.20In (cold state) Action Time
Used for protecting electric motors 12.5≤In≤400	≥2	＜2	≤4min	2s＜Tp≤10s	12In±20%

Technical performance indicators of M-NZS series plastic shell circuit breaker

model	Rated current (A)	polar number	Rated insulation voltage (V)	Rated working voltage (V)	Flying arc distance (mm)	Ultimate short-circuit breaking capacity (kA)	Operating short-circuit breaking capacity (kA)	Operational performance (lifespan) times
								energize	no power
M-NZS-100N	12.5,16,20, 25,32,40,50, 63,80,100	Two poles Three poles quadrupole	nine hundred and fifty	690 and below	0	twenty-five	twenty-five	one thousand and five hundred	eight thousand and five hundred
M-NZS-100H						seventy	seventy
M-NZS-100L						one hundred and fifty	one hundred and fifty
M-NZS-160N	16,20,25,32, 40,50,63,80, 100,125,160					thirty-six	thirty-six	one thousand	seven thousand
M-NZS-160H						seventy	seventy
M-NZS-160L						one hundred and fifty	one hundred and fifty
M-NZS-250N	160,180,200, 225,250					thirty-six	thirty-six	one thousand	seven thousand
M-NZS-250H						seventy	seventy
M-NZS-250L						one hundred and fifty	one hundred and fifty
M-NZS-400N	200,225,250, 300,315,400	Three poles quadrupole	nine hundred and fifty	690 and below	0	forty-five	forty-five	one thousand	four thousand
M-NZS-400H						seventy	seventy
M-NZS-400L						one hundred and fifty	one hundred and fifty
M-NZS-630N	315,350,400, 500,600,630					forty-five	forty-five	one thousand	four thousand
M-NZS-630H						seventy	seventy
M-NZS-630L						one hundred and fifty	one hundred and fifty
M-NZS-1600	800A 1000A 1250A 1600A	Three poles quadrupole	nine hundred and fifty	690 and below	0	one hundred and fifty	one hundred and fifty	eight hundred	three thousand

Modular system
The combination system of multiple additional modules makes the M-NZS series structure more complete. The trip elements, auxiliary devices, and connection accessories are the same in the following models. The common components of M-NZS-100~M-NZS-250 circuit breakers and load switches are shown in Figure 1. The composition and structure of M-NZS-400~M-NZS-630 circuit breakers are the same. Few components are applicable to all types.