KXM1-125 series high breaking miniature circuit breaker

Application

KXM1-125 series miniature circuit breaker mainly apply to AC 50Hz/60Hz, rated voltage 400V and single phase 230V, rated current 125A or lower than that, this series circuit breaker widely used modern construction electric circuit equip for overload protection or short circuit protection, also used for infrequent operation or isolation of normal circuit.

This series product with elegant appearance, small volume, accurate and fast current instantaneous tripping, reliable action, high breaking capacity, DIN rail installation etc advantages, composite pattern design which can assemble with the accessories such like auxiliary contact(OFF), alarm indicate contact(SD), undervoltage tripping(MN),shunt trip(MX) etc. to satisfy different clients' requirement, moulded case and parts adopt high strength flaming retardant anti-impact plastic, can use for long time.

This series miniature circuit breakers meet the following criteria:

IEC60947-2, GB14048.2.

Model No. and meaning:

Structure summarize:

KXM1-125 series miniature circuit breaker consist of moulded case, operate institution, contactor arc-extinguishing system, tripping mechanism etc. Moulded case made of flaming retardant high strength plastic, strong anti-impact and in light weight. The high strength plastic of operate institution can ensure reliable and sensitive and get lowest moment of inertia, and only need a moment when short circuit happened to trip mechanism. Tripping mechanism consist of bimetal inverse time overload trip mechanism and short circuit instantaneous electromagnetic mechanism these two parts to reach two section protection, have advance current limiting feature. Contactor arc-extinguishing system adopt special guide arc angle and arc-extinguishing chamber.

Feature:

Obtain certification of international quality system.

High breaking capacity, miniaturization, easy installation

Safety and reliable, sensitive action, free maintenance

Main technical parameter:

Rated current:63A,80A,100A,125A

Pole:1P,2P,3P,4P

DIN rail installation size:35X7.5

Main circuit rated parameter:

Overcurrent tripping characteristic

Power frequency withstand voltage: The circuit breaker should endure 2500V power frequency withstand voltage testing for 1 minute without flashover and breakdown phenomenon after anti-humidity and anti-high temperature performance testing.

Mechanical electric life: The circuit breaker mechanical electric life is 4000 times, electric life is 1500 times.

Overall installation size:

Bimetal:   Actually, it contains three metals iron, copper, cadmium, galvanized. Three metals with different coefficients of thermal expansion, bending cause thermal Pick reflect and making the breaker disconnect. This is the most import parts of the circuit breaker.  The Bimetal is the use of different materials under different breaker amperage.

Coil:  It's the important parts for the reaction of the Magnetic Trip. It's always 9 ring. As a matter of fact, the number of Coil with Different Amperage.For example, 1A reaches over 100 ring, and 63A is used to 56 ring. The Diameter Thickness is also different for Amperage.

Action Contactor(Sliver Point): It's the main point for the Reaction of Trip. Under normal conditions, keeping closed. When overload and short circuit, It will be breaking.

Arc Chute: Playing a role in destroying the arc. Generally tend to produce a large number of Moving and Static Contactor from the contactor, arc, even emerge spark.

Characteristic tripping curve:

Anti-high tempreture & humidity:II type(tempreture:55℃,relative humidity 95%)

Wire connecting: Use wire connecting terminal which with clamp to fix the cable, cross-section of cable can reach 50mm²