Scope of applicationARXM3 series molded case circuit
breakers(hereinafter referred to as circuit breakers)are suitable
for infrequent switching and motor starting inAC 50Hz(or
60Hz)circuits with rated insulation voltage of 1000V,rated working
voltage of 690V or 400V,and rated working current of 630A
(Inm≤630A and below).The circuit breaker has overload,short circuit
and undervoltage protection functions,and can protect lines and
power equipment from damage. According to its rated ultimate
short-circuit breaking capacity,the circuit breakers are classified
into four levels:C type (economic),L type (standard),M type
(medium breaking)and H type (high breaking). The circuit breaker
has the characteristics of small volume,high breaking
capacity,short arcing,antivibration,modular installation of
accessories, simple use,etc.The circuit breaker can be
installed vertically (i. e. upright)or horizontally(i. e.
transversely).The circuit breaker has isolation function.The
circuit breaker shall comply with IEC60947-2 and
GB/T14048.2.Material advantages of ARM3 series circuit breaker
products1.Heat shrinkable insulating material;2.Alloy contact with
high silver content;3.Mechanism parts:high quality high carbon
steel materials;4. The thermosetting insulating material adopts the
unique formula material,which has high strength,arc
resistance,strong insulation,high temperature resistance and
good flame retardancy;5. High sensitivity temperature sensing
element is made of high-quality bimetallic element materials,and
there is no need to reduce the capacity from-5ºCto 55ºCambient
temperature;6. Spring materials have longer temperature resistance
and fatigue resistance(50%longer than ordinary
springs).ModelARM3-250Rated current
In(A)100A/125A/140A/160A/180A/200A/225A/250ARated current of frame
size Inm(A)250AUsage categoryCategory ARated ultimate
short-circuit breaking capacity level L
M
HNumber of poles
(P)3P/4P 3P/4P
3P/4PRated working voltage Ue (V)400VRated ultimate
short-circuit breaking capacity Icu (kA)50KA
70KA
100KARated service short-circuit breaking capacity
Ics(kA)35KA 50KA
70KARated working voltage Ue
(V)690VRated ultimate short-circuit breaking capacity Icu
(kA) /
20KA /Rated
service short-circuit breaking capacity Ics(kA) /
10KA
/Rated insulation voltage Ui
(V)1000VRated impulse withstand voltage Uimp (V)12KVMechanical
life(time)7000Electrical life(time)1000Arcing distance (mm)
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