SM8 Series Moulded case circuit breaker(hereinafter referred to as SM8) is one of our company new type circuit breakers which is adopted international advanced design and manufacture technic to develop by ourselves.This circuit breaker is composed of the insulated case, operating mechanism, contact system, arc-extinguishing system, tripping mechanism, etc.They have many features of reasonable structure, small volume, high breaking capability, short fly arc distance, vibration resist and time delay rated current 80%¡«100%, adjustable etc. It¡¯s suitable in ship or land. And its rated insulated voltage is 800V, applied to AC 50HZ, rated voltage 690V. it used in switching the circuitry and starting electromotor unfrequent. SM8 have overload, short-circuit and lack voltage protection, protecting circuitry and power equipment without damage.
This MCCB can be upright installation, and level installation .
This product accord to Standard as follows:
IEC60947¡ª1, GB/T14048.1 general rules
IEC60947¡ª2, GB14048.2 low voltage circuit breaker
IEC60947¡ª4, GB14048.4 contactor and electromotor protection
IEC60947¡ª5¡ª1, GB14048.5 mechanical and electrical control circuit electric
Type&Meaning
sort
3.1 according to rated current (A): SM8-160 is 50¡«63, 63¡«80, 80¡«100, 100¡«125, 125¡«160A, SM8-250 is 125¡«160, 160¡«200, 200¡«250A, SM8-400 is 200¡«250, 250¡«315, 315¡«400A, SM8-630 is 315¡«400, 400¡«500, 500¡«630A;
3.2 according to connection manner: front connection and back connection;
3.3 according to over current tripping mechanism type: thermal-electromagnetic (duplicate), electromagnetic (instantaneous)style;
3.4 according to accessorial set: with accessories set and without accessories set. Accessories set include inside accessories set and exterior accessorial set. Inside have the minute urgestripping mechanism, lack voltage tripping mechanism, auxiliary contactor, alarm contactor. Exterior equipment have turn handle operation wheel , electromotor operation wheel etc.
normal working condition
4.1 Installation location altitude is under 2000m;
4.2 ambient medium temperature is between +40¡æ(ship use product is +45¡æ) and -5¡æ;
4.3 Endure infection of moist air;
4.4 Endure infection of salt fog and oil fog;
4.5 Endure infection of mildew;
4.6 max gradient is ¡À22.5¡ã;
4.7 working reliably under ship normally vibration;
4.8 place of medium without blast danger and the medium can¡¯t canker the metal and damage insulated air and electric dust;
4.9 The place without attack of rain and snow.
Main Technical Parameters
5.1 Circuit Breakerthermal tripping mechanism have counter time limit characteristic ,electromagnetic tripping mechanism have instantaneous action characteristic .according to protection use, it is divide into distribution use and electromotor protection use .Mainly protection characteristic see table 2 and table 3.
5.4 The minute urgestripping mechanism and lack voltage tripping mechanism technical parameter :
The additional voltage minute of urgestripping mechanism is from 70% to 110% of rated control power voltage, can reliablly break.
When power supply voltage fall down to 70%¡«35% rated voltage of lack voltage tripping mechanism, it can reliablly break. When power supply voltage lower than 35% rated voltage of lack voltage tripping mechanism, it can prevent circuit breaker from closing. When power supply voltage higher than 85% rated voltage of lack voltage tripping mechanism, it can ensure circuit breaker reliable close .
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SM-8 - CAIKI L.V