Overcurrent Protection Low Voltage Breakers Thermal Magnetic MCCB Moulded Case Circuit Breaker

Product Description

Application:

The molded case circuit breaker can cut off the current automatically when the current exceeds the trip setting. Plastic shell refers to the plastic insulator used as the shell of the device to isolate the conductors and the grounded metal part. Molded case circuit breakers usually contain thermomagnetic trip units, while large molded case circuit breakers will be equipped with Solid-state trip sensors. The trip unit is divided into thermal magnetic trip and electronic trip

working principle:The main contact of LV circuit breaker is closed by manual operation or electric operation. After the main contact is closed, the free tripping mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release and the power supply are connected in parallel.
  When the circuit is short circuited or seriously overloaded, the armature of the over-current release is engaged to make the free release mechanism act and the main contact opens the main circuit.When the circuit is overloaded, the hot element of the thermal release causes the bimetal sheet to bend, which pushes the free release mechanism to act, and the main contact disconnects the main circuit.When the circuit is undervoltage, the armature of the undervoltage release also makes the free release mechanism act and the main contact opens the main circuit. When the shunt release button is pressed, the armature of the shunt release is engaged to make the free release mechanism act and the main contact opens the main circuit
 

Technical specifications
Protect grade	IР20
Mounting	Screw bolt
Section Cable , мм2	Rated current    31,5А - 2,5...95
	Rated current    250А - 50...185
	Rated current    400А - 95...240
Number Poles	3
Rated current, А	250
Seting of the electromegnetic Release  Ir1 (A)	ВА 51-35 - 16; 20; 25; 31,5; 40; 50; 63; 80; 100; 125; 160; 200; 250; 320; 400
Seting of the electromegnetic Release   Iр	ВА 51-35
	AC  - 12In
	DC - 6; 8; 10 In  (by requirment )
	16-25А - 320А
	31,5-50А - 630А
	63-125А - 1250А
	160А - 2000А
	200-250А - 2500А
Rated Voltage V	AC - 380/660
	DC - 220/440
Limiting circuit-breaking ability,Icu кА
400V	50
690V	25
Operating circuit-breaking ability Ics kA
400V	35
690V	15
Protect grade IP	20
Electrical life	12500
Mechenical life	20000
Temperature	-50.0 ºC-+ 50.0 ºC
Maximum working temperature	50.0 (ºC.)