NM1B series plastic case circuit breaker

Function and use

This circuit breaker has a rated insulation voltage of 800V (400A frame to 1000V). It is suitable for distribution network circuits with AC 50Hz, rated operating voltage to 690V, and rated operating current from 10A to 400A. It is used to distribute power and protect lines and power equipment from damage by overload, short circuit, undervoltage and other faults.

Detailed parameters

25< tr>< /tr>Frame grade rated current (A)< td>Frame rating rated current (A) td>4.3 Inverse time limit breaking action characteristics of the overcurrent release of the circuit breaker for motor protection when all poles are energized at the same time (see Table 4)< td>Cold state td>

Parameter classification	Parameter item	Parameter value
4.1 Rating of circuit breaker (see Table 2)	Model	NM1B-125S
	Frame rating rated current (A)	125
	Rated current (A)	10, 16, 20, 25, 32 , 40, 50, 63, 80, 100, 125
	Rated operating voltage Ue(V)	400
	Rated insulation voltage Ui (V)	800
	Rated ultimate short-circuit breaking capacity (kA)
	Rated operating short-circuit breaking capacity (kA)	15
	Machine Mechanical life (times)	20000
	Electrical life AC400V (times)	3000
	Number of poles	3, 4
	Arc distance (mm)	≤50
	Model number	NM1B-W125S
	Frame rating rated current (A)	125
	Rated current (A)	63, 70, 75, 80, 90, 100, 110, 120, 125
	Rated operating voltage Ue(V)	400
	Rated insulation voltage Ui(V)	800
	Rated ultimate short-circuit breaking capacity (kA)	35
	Rated operating short-circuit breaking capacity (kA)	17.5
	Mechanical life (times)	20000
	Electrical life AC400V (times)	3000
	Number of poles	3, 4
	Arc distance (mm)	≤50
	Rated Working voltage Ue(V)	690
	Rated insulation voltage Ui(V)	800
	Rated ultimate short-circuit breaking capacity (kA)	3
	Rated operating short-circuit breaking capacity (kA)	3
	Model number	NM1B-160S
	Frame grade Rated current (A)	160
	Rated current (A)	63, 80, 100, 125, 140, 150, 160
	Rated operating voltage Ue(V)	400
	Rated insulation Voltage Ui (V)	800
	Rated ultimate short-circuit breaking capacity (kA)	35
	Rated operating short-circuit breaking capacity (kA)	17.5
	Mechanical life (times)	20000
	Electrical life AC400V (times)	3000
	Number of poles	3, 4
	Arc distance (mm)	≤50
	Rated operating voltage Ue(V)	690
	Rated insulation voltage Ui(V)	800
	Rated ultimate short-circuit breaking capacity (kA)	3
	Rated operating short-circuit breaking capacity (k A)	3
	Model number	NM1B-250S
	250
	Rated current (A)	160, 180, 200, 225, 250
	Rated operating voltage Ue(V)	400
	Rated insulation Voltage Ui (V)	800
	Rated limit short-circuit breaking capacity (kA)	35
	Rated operating short-circuit breaking capacity (kA)	17.5
	Mechanical life (times)	20000
	Electrical life AC400V (times)	3000
	Number of poles	3, 4
	Arc distance (mm)	≤50
	Rated operating voltage Ue(V)	690
	Rated insulation voltage Ui(V)	800
	Rated ultimate short-circuit breaking capacity (kA)	4
	Rated operating short-circuit breaking capacity ( kA)	4
	Model number	NM1B-400S
	400
	Rated current (A)	250, 315, 400
	Rated operating voltage Ue(V)	400
	Rated insulation voltage Ui(V)	1000
	Rated ultimate short-circuit breaking capacity (kA)	35
< /td>	Rated operating short-circuit breaking capacity (kA)	17.5
	Mechanical life (times)	5000
	Electrical life AC400V (times)	1000
	Number of poles	3, 4
	Arc distance (mm)	≤100
4.2 Distribution circuit breaker Inverse time limit breaking action characteristics when all poles of the current release are energized at the same time (see Table 3)	Serial number	1
	Test current name	Agreed no tripping current
	I/In	1.05
	Appointed time	2h (In>63A), 1h (In≤63A)
	Initial state	Cold state
	Serial number	2
	Test current name	Conventional tripping current
	I/In	1.30
	Appointed time	2h(I n>63A), 1h (In≤63A)
	Initial state	Start immediately after test number 1
Serial number	1
< /td>	I/In	1.0
	Appointed time	>2h
	Initial state	Cold state
	Remarks
	Serial number	2
	I/In	1.2
	Appointed time	≤2h
	Initial state	Start immediately after test number 1
	Remarks	10≤In≤25
	Serial number	3
	I/In	1.5
	Appointed time	≤2min
	Initial state	Hot state
	Remarks	30
	Appointed time	≤8min
	Initial state	Hot state
	Serial number	4
	I/In	7.2
	Appointed time	0.5s≤T≤5s
	Initial status
	Remarks	10≤In≤25
	Appointed time	6s≤T≤20s
	Initial state	Cold state
	Remarks	30≤In≤400
4.4 Circuit breaker short-circuit protection current setting value (see Table 5)	Model	NM1B-1 25S
	Instantaneous operating current setting value II (A) and tolerance of distribution circuit breaker	10In,±20%
	The instantaneous operating current setting value II (A) and tolerance of the circuit breaker for motor protection	12In, ±20%