The Cooper Bussmann range of motor fuses are designed to meet the specific requirements necessary for motor protection. During the starting cycle of direct on-line motors, the fuse elements will reach a considerably higher temperature than during normal operation; (this is due to the high amount of current the motor will draw as it starts, typically, six times its normal load current value). This results in expansion and contraction of the fuse elements and could cause premature operation of the fuse.
 

Cooper Bussmann motor fuses encompass an advanced design to minimize this effect. This therefore, negates the need to over specify the fuse rating due to high values of motor starting current.
 

Cooper Bussmann motor fuses operate extremely quickly under heavy fault currents, resulting from the time / current characteristic. Low power dissipation ensures low temperature rise, important in multi-tier starters for example. Switching (arc), voltages are lower than permitted values, therefore, 5.5kV fuses are also suitable for 4.8kV and 2.4kV circuits.

Table of Ratings

Catalog Numbers	Amp Ratings	Volts	Breaking Capacity	Dimensions - in(mm)		Dimensional Standard
				Length	Diameter
3.6WJON65	5	3.6kV	50kA	7.56 (192)	1.4 (35.6)	BS 2692 (TA1) Interchangeable with GEC type K2 PA
3.6WJON66.3	6.3
3.6WJON610	10
3.6WJON616	16
3.6WJON620	20
3.6WJON625	25
3.6WJON631.5	31.5
3.6WJON640	40
3.6WJON650	50
3.6WDOH650	50			7.56 (192)	2 (50.8)	BS 2692 (TA1) or DIN 43625
3.6WDOH663	63
3.6WDOH680	80
3.6WDOH6100	100
3.6WDOH6125	125
3.6WFOH6160	160			7.56 (192)	3 (76.2)	BS 2692 (TA1) or DIN 43625
3.6WFOH6200	200
3.6WDLSJ50	50			11.5 (292.1)	2 (50.8)	DIN 43625
3.6WDLSJ63	63
3.6WDLSJ80	80
3.6WDLSJ100	100
3.6WDLSJ125	125
3.6WFLSJ160	160			11.5 (292.1)	3 (76.2)	DIN 43625
3.6WFLSJ200	200
3.6WDFHO50	50			10 (254)	2 (51)	BS 2692 (TA2)
3.6WDFHO63	63
3.6WDFHO80	80
3.6WDFHO100	100
3.6WDFHO125	125
3.6WFFHO160	160			10 (254)	3 (76.2)	BS 2692 (TA2)
3.6WFFHO200	200
3.6WKFHO250	250			10 (254)	3 (76.2)	BS 2692 (TA2)
3.6WKFHO315	315
3.6WKFHO355	355
3.6WKFHO400	400
5.5VFNHA2R	2R	5.5kV	60kA	15.86 (402.8)	3 (76.2)	ANSI R-rated
5.5VFNHA3R	3R
5.5VFNHA4R	4R
5.5VFNHA6R	6R
5.5VKNHA9R	9R			15.86 (402.8)	3 (76.2)	ANSI R-rated
5.5VKNHA12R	12R
5.5VKNHA24R	24R
7.2WFNHO25	25	7.2kV	40kA	15.86 (402.8)	3 (76.2)	BS 2692 (TA4)
7.2WFNHO31.5	31.5
7.2WFNHO40	40
7.2WFNHO50	50
7.2WFNHO63	63
7.2WFNHO80	80
7.2WFNHO100	100
7.2WFNHO125	125
7.2WFNHO160	160
7.2WKNHO200	200			15.86 (402.8)	3 (76.2)	BS 2692 (TA4)
7.2WKNHO224	224
7.2WKNHO250	250
7.2WKNHO315	315
7.2WFMSJ25	25		63kA	17.40 (442)	3 (76.2)	DIN 43625
7.2WFMSJ31.5	31.5
7.2WFMSJ40	40
7.2WFMSJ50	50
7.2WFMSJ63	63
7.2WFMSJ80	80
7.2WFMSJ125	125
7.2WFMSJ160	160
7.2WKMSJ200	200			17.40 (442)	3 (76.2)	DIN 43625
7.2WKMSJ224	224
7.2WKMSJ250	250
7.2WKMSJ315	315
7.2WKMSJ355	355