40 Amp Double Pole MCB

General

The YCB7-63N series miniature circuit breaker are suitable for overcurrent protection building line facilities and similar purposes in AC 50/60Hz, rated voltage 230V/400V, rated current up to 63A circuits. They have

isolation, overload, and short circuit protection functions, and can also be used for infrequent operation and switching of lines undernormal circumstances. Circuit breakers are suitable for various places such as

industry,commerce, high-rise buildings, and residential buildings.

Standard: IEC/EN 60898-1.

Applications

Manufacturing: Protect CNC machines, compressors, and conveyor systems.
Commercial Kitchens: Safeguard industrial ovens and refrigeration units.
HVAC Systems: Prevent overloads in high-capacity air handlers.

Selection

YCB7		63	N	1P		16
Model		Shell grade current	Breaking capacity	Number of poles	Tripping. characteristics	Rated current
Miniature circuit breaker		63	N:6kA	1P 2P 3P 4P	B C D	1 2 4 6 10 16 20 25  50 63

Note:This product can be assembled with accessories(YCB7-63N OF/SD/OF+SD/ MX/ MVMN/MX+OF, etc)

Technical data

Type	Standard			IEC/EN 60898-1
Comprehensive data	Function			Overload,Short circuit,Isolation
	Number of poles			1P,2P,3P,4P
	Rated current In		A	1-63A
	Rated frequency		Hz	50/60Hz
Electrical features	Rated voltage Ue		V	230/400
	Rated insulation voltage Ui		V	500
	Rated breaking capacity Icn		A	6000
	Rated impulse withstand voltage Uimp(1.2/50)		kA	4
	Pollution degree			2
	Use category			II、Ⅲ
	Trip type			Thermal magnetic release
	Thermal magnetic tripping characteristics			B,C,D
	Electrical and mechanical accessories			□
Mechanical features	Mechanical life		Times	20000
	Electrical life		Times	10000
	Protection degree			IP20
	Antihumidity and heat resistance			The relative humidity of the air is not more than 50%when the ambient air temperature is +40℃,and it can have a higher relative humidity at a lower temperature
	Reference ambient temperature		℃	30
	Ambient temperature		℃	-5°C-+40℃,the average value of 24h does not exceed+35℃
	Height		m	Not exceeding 2000
Installation	Terminal connection type			Cable/Pin-type busbar
	Maximum wire capacity	Terminal size top/bottom for cable	mm²	25
			AWG	18-3
		Terminal size top/bottom for busbar	mm²	25
			AWG	18-3
	Torque		N*m	2
			In-Ibs	18
	Tool		18	Phillips screwdriver or flat-blade screwdriver
	Installation			On DIN rail EN 60715(35mm)by means of fast clip device
	Wiring method			From top or bottom

Overall and mounting dimensions(mm)

Selection

Type	Test current	Tripping time	Expected result		Type	Test current	Tripping time	Expected result
B,C,D	1.13In	t≤1h(In≤63A)	Not tripping		B	3In	t≤0.1s	Not tripping
	1.13In	t≤2h(In>63A)			C	5In	t≤0.1s
B,C,D	1.45In	t<1h(In≤63A)	Tripping		D	10ln	t≤0.1s
	1.45In	t<2h(In>63A)			B	5In	t<0.1s	Tripping
B,C,D	2.55In	1s	Tripping		C	10ln	t<0.1s
	2.55In	1s32A)			D	20In	t<0.1s

Curve

 

A Story of Reliability: How a Factory Saved Thousands with the Right MCB

1. Background

At a bustling small manufacturing plant in Chicago, managers prided themselves on meeting tight production deadlines. But behind the scenes, their aging electrical panels were a ticking time bomb.

2. The Challenge

The facility’s old circuit breakers frequently tripped during peak hours, halting assembly lines. Workers faced downtime, and repairs cost $5,000 monthly. Worse, a near-miss electrical fire revealed hidden risks.

3. The Conflict

“Every outage meant lost orders,” recalls the plant manager. “But upgrading the entire system was too expensive. We needed a fix that worked now.”

4. The Turning Point

An audit exposed the root cause: single-pole MCBs couldn’t handle fluctuating loads. The team realized they needed dual protection for both live and neutral lines.

5. The Solution

They installed the YCB7-63N 40A Double Pole MCB. With thermal-magnetic tripping and 20,000-cycle durability, it stopped overloads without nuisance trips.

6. The Results

Downtime reduced by 90% in 3 months.

$48,000 saved annually on repairs and lost productivity.

Zero safety incidents since installation.