Cutler Hammer Mini Circuit Breakers

Application
CYD series miniature circuit breakers are composed of the moulded case, operating mechanism,
contact system, arc-extinguishing system, tripping mechanism, etc. The case is made of the special
plastic high in fire-resistance and strength, so it is very capable of resisting impact and light in weight.
The parts of the operating mechanism employ high strength plastic products in order to assure the
flexible, reliable operation and obtain the minimum moment of inertia as well so that the time from
the moment the short-circuit fault occurs to the operation of the tripping mechanism is very little.
The tripping mechanism is composed of the two part of bimetal sheet overload counter time limit
tripping mechanism and short-circuit instantaneous electromagnetic mechanism. The contact arcextinguishing
system employs the special arc-conducting angle and gangway arc-extinguishing
chamber so it has distinct current limiting characteristics.
Main Technical Data

Standard		IEC898, GB10963, BS3871.1
Number of poles		1P, 2P, 3P, 4P
Rated current(In)		1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63
Rated voltage(Un)		AC230/400V
Rated frequency		50/60Hz
Tripping curve		B, C, D
Release action characteristics	Time delay	1.13In ≥1h non-trip
		1.45In <1h trip
		2.55In 1S <60S trip
	Instantaneous (Curve C)	5In ≥0.1S non-trip
		10In <0.1 trip
Magnetic releases operate		B curve: between 3 and 5In
		C curve: between 5 and 10In
		D curve: between 10 and 14In
Rated breaking capacity(Icn)		6000A
Endurance		≥ 2500
Circumstance temperature		-5ºC+40ºC
Electrical life		≥ 6000 times
Mechanical life		20000 times
Tropical ration		Treatmen 2(RH95%, at 55ºC)
Protection degree		IP20