GENERAL

RGM8-250 moulded case circuit breaker (hereafter simply referred to as breakers), the rated insulation voltage of the breakers is 800V. In the circuit of AC50Hz/60Hz, rated working voltage 690V or below ,rated current from 125A to 250A, the breakers take the role of infrequent turn-on or turn-off .The breakers have overload and short-circuit protection devices ,so as to protect the circuit and the power equipment against damage.

The breakers could be installed vertically or horizontally.

The breakers have isolating function and its corresponding symbol is shown as .

The breakers comply with the demands of the following standards:

EN/IEC60947-1 Low-voltage switchgear and controlgear——Part1：General rules.

EN/IEC60947-1 Low-voltage switchgear and controlgear——Part 2：Circuit-breaker.

NORMAL SERVICE AND MOUNTING CONDTIONS

The ambient air temperature does not exceed ＋40℃ and its average over a period of 24h does not exceed ＋35℃,the lower limit of the ambient air temperature is －5℃.

The altitude of the site of installation does not exceed 2000m.

The relative humidity of the air does not exceed 50% at a maximum temperature of +40℃ , higher relative humidities may be permitted at lower temperature,e.g.90% at +20℃. Special measures may be necessary in cases of occasional condensation due to variations in temperature.

Pollution degree 3.

Installing category: III for the main circuit , and II for other auxiliary and control circuits.

Be suitable in electromagnetic environment A.

There must be not any explosive medium, and there must be not any gas which would corrode metal or any conducting dust which would destory the insulation

The place would not be invaded by rain and snow. 

MAIN TECHNICAL PERFORMANCE INDEX

Frame			250
Type			RGM8-250
Pole number			3			4
Type of trip unit	Thermal-magnetic fixed		√
	Thermal unfixed-magnetic fixed		√
Rated current   In (A)	Thermal-magnetic fixed		125、160、180、200、225、250
	Thermal unfixed-magnetic fixed		125、160、180、200、225、250
Thermal release setting current Ir(×In)			0.8-0.9-1.0
Rated insulation voltage(VAC)       Ui			800			800
Rated impulse withstand vol(V)   Uimp			8000			8000
Rated operational voltage (VAC)     Ue			400			400
Breaking ability code			S			S
Rated ultimate   short-circuit     breaking ability         (kA) Icu		400V	35			25
		690V	-			-
Operating short-circuit breaking ability        Ics (%Icu)			50			50
Arc-over distance（mm）			≯50			≯50
Category			A			A
Over-current tripping device			Thermal-magnetic			Thermal-magnetic
Comply standards			IEC60947-2			IEC60947-2
Operational performance (times)	Mechanical life		7000			7000
	Electrical life		1000			1000
Outline dimensions(mm)		L	165			165
		W	105			140
		H	60			60
Shunt release			√			√
Under-voltage release			√			√
Auxiliary contact			√			√
Alarm contact			√			√
Turning handle mechanism			√			√
Power-driven mechanism			√			√

OUTLINE AND MOUNTING DIMENSIONS

Outline dimensions

Mounting dimensions