SM8 Series moulded case circuit breaker

Keyword:1P,2P,3P(3P+N),4Pole, Apply for isolator switch, Electric and thermal magnetic tripping device

Provide miniature circuit breaker lockouts,Similar ABB

Application

SM8 series Molded case circuit breaker(hereinafter referred to as MCCB) is the new series MCCB, which is developed strictly according to

international standards and manufactured with advanced technology.

This product complies with IEC60947-2.The MCCB, having rated insulation voltage 500V(lnm ≤ 160A) to(lnm ≥ 250A) is designed to be used for distribution network of having rated current 10A to 1600A, rated operational voltage 380/400V to660/690, intended for power distribution, protection of electricalequipments and circuits against overload, short-circuit and undervoltage, and also for unfrequent switching of electric circuits in mostcases. MCCB with frame rating up to and including 400A can be used for unfrequent starting, and interruption of squirrel cage motors, and for protection of motors against overload, short-circuit and under voltage.

SM8 series circuit breakers can be equipped with electric accessories and mechanical accessories, such as under voltage release, shunt release, auxiliary contacts, alarm contact, electric operating mechanism and rotary mechanical operating handle etc.

SM8 series intelligent molded case circuit breakers are equipped with electronic release with the function of protection of electric circuits and equipments not only against overload, short-circuit and under voltage, but also against earthing failure. The intelligent functions of it are: current failure; output of over-current signal and monitoring of circuit breaker open/close, particularly, the intelligent trip unit is designed with interface available for remote measuring, remote adjusting, remote controlling and remote communicating between circuit breakers and computers.

Technical features

Complete range of current ratings which enable users to solve all protection requirements of installation

with high short-circuit breaking capacity

B-Basic type: general breaking capacity

N-Ordinary type: ordinary breaking capacity

S-Standard type: standard breaking capacity

H-Higher breaking type: higher breaking capacity

Degree of rated ultimate short-circuit breaking capacities

Frame rating lnm(A)	Rated ultimate short-circuit breaking capacity(lcu)
	20kA	25kA	30kA	35kA	50kA	65kA	70kA	85kA
125A	B	N
160A		B	N
250A				N	S	H
400A				N	S	H
800A				N	S		H
1600A					S			H