Most people do know what miniature circuit breaker is, but they may not know how miniature circuit breaker works, and how they protects from short circuit and overload, as they don’t know miniature circuit breaker construction, which is exactly the basic for knowing more about miniature circuit breaker.Here we analyse the construction with example of breaker SLB1-63, which is mainly composed of parts as below: (1) Operating handle: for circuit breaker’s switching, closing and resetting manually, also for locally instructing circuit breaker’s state of switching and closing (2) Tripping mechanism (including lock catch, lever and tripping panel): for connecting and separating from contact (3) Wiring terminals: for wiring at top and bottom (4) Device for contact (including moving and static contacts and joint plate): for current switched on and cut off (5) Bimetal strips: bimetal strips bend as two bimetal strips have different coefficients of thermal expansion, the bending angle increases as overload current rises, which makes bimetal strips touch lever and then push tripping mechanism, thus making miniature circuit breaker play the role of overload protection (6) Eletromagnetic solenoid (also called as instantaneous coil): when short-circuit happens, large current goes through induction coil, which will cause a strong suction and then push lever, making circuit breaker trips fast (7) Adjusting screw: for factory workers to adjust tightness of bimetal strips, thus realizing adjustment of tripping current value of overload (8) Arc-suppression device (including arc extinguish chamber and run-on plate): for arc suppressing (9) Circuit breaker case, including base and cover Items above are the main parts for a MCB. After you really know these main parts and their functions, you will naturally understand how a miniature circuit breaker works! For more useful manuals, please visit www.miniature-circuit-breaker.com!

1. 1
More exciting will be coming soon from www.miniature-circuit-breaker.com/blog!
Safety & so much more
Miniature circuit breaker construction, can not be more specific any more!
Most people do know what miniature circuit breaker is, but they may not know how miniature circuit
breaker works, and how they protects from short circuit and overload, as they don't know miniature
circuit breaker construction, which is exactly the basic for knowing more about miniature circuit breaker.
Here we analyse the construction with example of mcb circuit breaker SLB1-63, which is mainly
composed of parts as below:
(1) Operating handle: for circuit breaker's switching, closing and resetting manually, also for locally
instructing circuit breaker's state of switching and closing
(2) Tripping mechanism (including lock catch, lever and tripping panel): for connecting and separating
from contact
(3) Wiring terminals: for wiring at top and bottom
(4) Device for contact (including moving and static contacts and joint plate): for current switched on and
cut off

2. 2
More exciting will be coming soon from www.miniature-circuit-breaker.com/blog!
Safety & so much more
Miniature circuit breaker construction, can not be more specific any more!
(5) Bimetal strips: bimetal strips bend as two bimetal strips have different coefficients of thermal
expansion, the bending angle increases as overload current rises, which makes bimetal strips touch lever
and then push tripping mechanism, thus making miniature circuit breaker play the role of overload
protection
(6) Eletromagnetic solenoid (also called as instantaneous coil): when short-circuit happens, large current
goes through induction coil, which will cause a strong suction and then push lever, making circuit breaker
trips fast
(7) Adjusting screw: for factory workers to adjust tightness of bimetal strips, thus realizing adjustment of
tripping current value of overload
(8) Arc-suppression device (including arc extinguish chamber and run-on plate): for arc suppressing
(9) Circuit breaker case, including base and cover
Items above are the main parts for a MCB. After you really know these main parts and their functions, you
will naturally understand how a miniature circuit breaker works!