YCM8N Series MCCB

 

Operating conditions

1. Altitude: Below 2000m

2. Temperature: The temperature of media is not higher than 40°C ( +45°C for marine products) and not lower than -5°C.

3. Can withstand the bad environment of damp air, mold, radiation.

4. The maximum inclination is 22.5 degree.

5. Can work reliably under normal vibration of ship.

6. Can work reliably under earthquake(4g).

7. Should be no rain and snow hit.

8. The media should be no explosion danger and no gas which can corrode the metal or destroy the insulating or conductive dust.

Type designation

Type	Frame Inm	Breaking capacity Icu/lcs(kA)	Operation	Poles
YCM8N	125	S	P	3
MCCB	125,250,400,630	125  15/10 250 25/18 400 35/25 630 35/25	Default—handle direct operation;   P—electric operation   Z—rotating handle operation	3:three poles

 

Tripping mode and inner accessory		Application		Rated current(A)
300		2		125A
The first number indicate release mode 2: only with the instantaneous release device 3: complex release Note: the last two numbers are attachment code (see attachment table)		1: for distribution 2: for protecting the motor		125  10,16,20,32,40,50,63,80,100,125 250  100,125,140,160,180,200,225,250 400  250,300,315,350,400 630  400,500,630

Product Accessories

Accessory Product List

• Electrical Accessories: Shunt Trip, Undervoltage Release, Auxiliary Contact, Alarm Cotact,Integrated Auxiliary & Alarm Contact

• Mechanical Accessories: Phase Spacer, Extension Terminal, Manual Operating Mechnism, Electrical Operating Mechanism

• Installation Accessories: Fixed Plate Rear Accessory, Plug-in Accessory

Overview

Inner accessories

Accessories of YCM8, YCM8LE, YCM8T/A, YCM8RT, YCM8E are the same.

Technical data

Technical Parameters

The thermal trip unit of the circuit breaker features an inverse time-delay characteristic;The magnetic trip characteristics are shown in Table 2 (for distribution use)

Table 2 Tripping Characteristics of Thermal-Magnetic and Magnetic

Trip Units

Rated Tripping Current(A)	Thermal-magnetic trip unit(ambient temperature +40°℃)		Operating current of the magnetic trip unit(A)
	1.05In(cold state) Non-operating time (h)	1.30ln(hot state) operating time (h)
10≤In≤63	1	1	6ln±20%,8ln±20%10ln ±20%,7In±20%
63	2	2
Note:The non-operating time of the motor protection cirrcuit breaker is 2h at 1.0ln;the operating current is 1.20ln(hot state),and the operating time is 2h.The operating current of the electromagnetic release is 12In±20%.

 

Curve

Altitude Derating

When the altitude is below 2000m, it will not affect the performance of the circuit breaker. When exceeding this altitude, the decrease in air insulation characteristics and cooling capacity must be considered; the following correction factors are used for installations at altitudes exceeding 2000m:

Altitude(m)	2000	2500	3000	3500	4000	4500	5000
Insulation Voltage Ui(V)	800	728	728	664	664	616	616
Impulse Withstand Voltage Uimp(kV)	8	7	7	6.5	6.5	6	6
Maximum Working Voltage Ue(V)	690	690	690	660	660	600	550
Thermal Rating In(A)at 40℃Ambient Temperature	1.0ln	0.98ln	0.94In	0.92In	0.88ln	0.86ln	0.85In
Note:In high-altitude environments,the breaking capacity needs to be derated according to the corresponding rated working voltage,generally selected between 75%and 50%,which is inversely proportional to the altiude.For details,please communicate with the technical department

Temperature Influence Characteristics

Influence of High Temperature on Release Performance (High Temperature Derating Characteristics)

When the temperature exceeds 40°C, the overload protection will have slight changes. In the release time/current curve, the Ir setting value of the circuit breaker must be corrected according to the following coefficients I/Ir.

Model	Ambient Temperature(℃)
	40	45	50	55	60
YCM8N-125	1	0.96	0.89	0.83	0.75
YCM8N-250	1	0.92	0.85	0.79	0.71
YCM8N-400/630	1	0.94	0.87	0.81	0.73

 Mechanical Accessories

Phase Spacers

·Phase spacers can enhance the  insulation  performance  between  phase conductors and     can be installed from the front slot even after the switch is installed.

·Phase spacers are standard equipment,with 4  pieces for a 3P circuit  breaker.

Extension Terminals

Extension terminals are connected to the standard terminals of the circuit breaker to pro vide various wiring solutions in a small space:

• Straight extension terminals • Pole pitch extension terminals

Busbars and extension terminals can be connected to the inlet or outlet end of the circuit breaker.

Handle Operating Mechanism

·The  circuit  breaker  is  operated  by  rotating  the  handle.The  ergonomically  designed  ro-    tating handle makes the operation of the circuit breaker more flexible. ·There  are two forms  of  rotating  handle  operating  mechanisms:

Direct rotating handle (round hand operation,square hand operation)

Extended rotating handle (round extended hand operation,square extended hand oper- ation)

·User   visual    information/settings:

Three   position   indications:OFF,ON,TRIP

The circuit breaker cannot be closed when the door is open. The door cannot be opened when closed.

The shaft length of the extended handle can be customized according to the distance from the back of the circuit breaker to the door.

·Hand  operation  installation  diagram,accessory  installation  diagram

Hand operation external dimensions

 
 

CD2 Electric Operator

Electrical Characteristics and Wiring Diagram
 

Electrical Accessories

 

 

Overall and mounting dimensions(mm)

Type	Overall size(mm)
	W	L	H	A	B	W1	L1	L2	H1	H2	D	D1
YCM8N-125	75	130	84	112	25	26	117	75	56	66	φ4	M6
YCM8N-250	106	165	101	126	35	35	147	97	69	78	φ5	M8
YCM8N-400/630	150	157	150	194	44	48	224	156	102	112	φ14	M10