NB-5SM1/NB- 5SM3 Residual Current Circuit Breaker

Short Description:

Series NB-5SM1/NB-5SM3 residual current circuit breaker apply to in AC circuit of frequency of 50H乙 rated voltage up to 400v, rated current up to 80A. It is mainly used as an indirect contact protection for human. It also can be used to prevent against the fire danger caused by earth fault current owing to equipment insulation damage. When the protective measures of the electric shock are out of work, the RCCB whose rated residual operating current less than 30mA can serve as the supplementary protection for indirect contact, but it can*t be used as the sole direct contact protection.

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SPECIFICATION

1 .Series NB-5SM1 Breakers are the protector for pure electromagnetic residual current operation.

2.The operation function is unrelated to circuit voltage ,but operation is reliable.

3.lt can be reliably operated on the loss of the phase or neutral.

4.The capacity of resisting electromagnetic interference is strong.

MAIN TECHNICAL DATA

Type	Poles of No.	Un (V)	Hz	Im I m	Inc Lm	I nA	I n mA	Lno mA	The maximum of break-time(s)
Type	Poles of No.	Un (V)	Hz	Im I m	Inc Lm	I nA	I n mA	Lno mA	I N	2I N	5I N	0.25A	500A
NB-5SM1 NB-5SM3	2P	230	50,60	500A (In， 50A 10ln) (ln> 50A)	6000A	6,10,16,2532,40,50,63,80	30	15	0.2	0.1	-	0.04	0.04
							50	25	0.2	0.1	-	0.04	0.04
							75	40	0.2	0.1	-	0.04	0.04
							100	50	0.2	0.1	0.04	-	0.04
							300	150	0.2	0.1	0.04	0.04	0.04
							500	250	0.2	0.1	0.04	0.04	0.04
NB-5SM1 NB-5SM3	4P	400	50,60	500A (Inm 50A 10ln) (ln> 50A)	6000A	6,10,16,2532,40,50,63,80	30	15	0.2	0.1	-	0.04	0.04
							50	25	0.2	0.1	-	0.04	0.04
							75	40	0.2	0.1		0.04	0.04
							100	50	0.2	0.1	0.04	-	0.04
							300	150	0.2	0.1	0.04	0.04	0.04
							500	250	0.2	0.1	0.04	0.04	0.04