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Fuses

Switch disconnectors with 3KM fuses are suitable for all fuses in LV HRC design, see Protective devices > Fuse systems > LV HRC fuse systems/protective devices > Fuse systems > SITOR semiconductor fuses.

LV HRC design fuses for SITOR semiconductor protection can also be used, although it must be noted that, compared to cable and line protection fuses, these get much hotter during operation. For this reason, the fuse must be operated below the rated current of the device (derating) when installed in a closed switching device.

The following table shows the permissible rated currents of the SITOR fuses for installation in 3KM. The values were determined using the conductor cross-sections specified in the table.

Note

If using smaller cross-sections, a considerably higher derating is required due to the lower heat dissipation.

SITOR fuses for 3KM fuse switch disconnectors: Assignment table

SITOR fuse data						Permissible rated currents of fuse when installed in 3KM for busbar mounting
						Type 3KL			Alternative type - 3KL
Type¹⁾	Rated cur- rent I_n	Rated voltage ²⁾	Operational class	Size	Required conductor cross-section Cu	Type	Size	Permissible load current ³⁾	Type	Size	Permissible load current ³⁾
	A	V AC			mm?			A			A
3NE1 020-2	80	690	gR	00	25	3KM52	00	80	3KM53	00	80
3NE1 021-0	100	690	gS	00	35	3KM52	00	100	3KM53	00	100
3NE1 021-2	100	690	gR	00	35	3KM52	00	100	3KM53	00	100
3NE1 022-0	125	690	gS	00	50	3KM52	00	125	3KM53	00	125
3NE1 022-2	125	690	gR	00	50	3KM52	00	125	3KM53	00	125
3NE1 224-0	160	690	gS	1	70	3KM55	1	160	3KM57	2	160
3NE1 224-2/-3	160	690	gR	1	70	3KM55	1	160	3KM57	2	160
3NE1 225-0	200	690	gS	1	95	3KM55	1	200	3KM57	2	200
3NE1 225-2/-3	200	690	gR	1	95	3KM55	1	200	3KM57	2	200
3NE1 227-0	250	690	gS	1	120	3KM55	1	250	3KM57	2	250
3NE1 227-2/-3	250	690	gR	1	120	3KM55	1	245	3KM57	2	250
3NE1 230-0	315	690	gS	1	2x 70	3KM57	2	315	--	--	--
3NE1 230-2/-3	315	690	gR	1	2x 70	3KM57	2	280	--	--	--
3NE1 331-0	350	690	gS	2	2x 95	3KM57	2	330	--	--	--
3NE1 331-2/-3	350	690	gR	2	2x 95	3KM57	2	300	--	--	--
3NE1 332-0	400	690	gS	2	2x 95	3KM57	2	375	--	--	--
3NE1 332-2/-3	400	690	gR	2	2x 95	3KM57	2	315	--	--	--
3NE1 333-0	450	690	gS	2	2x 120	3KM57	2	400	--	--	--
3NE1 333-2/-3	450	690	gR	2	2x 120	3KM57	2	325	--	--	--
3NE1 334-0	500	690	gS	2	2x 120	3KM57	2	400	--	--	--
3NE1 334-2/-3	500	690	gR	2	2x 120	3KM57	2	350	--	--	--
3NE1 802-0	40	690	gS	000	10	3KM50	00	40	3KM52	00	40
3NE1 803-0	35	690	gS	000	6	3KM50	00	35	3KM52	00	35
3NE1 813-0	16	690	gS	000	1.5	3KM50	00	16	3KM52	00	16
3NE1 814-0	20	690	gS	000	2.5	3KM50	00	20	3KM52	00	20
3NE1 815-0	25	690	gS	000	4	3KM50	00	25	3KM52	00	25
3NE1 817-0	50	690	gS	000	10	3KM50	00	50	3KM52	00	50
3NE1 818-0	63	690	gS	000	16	3KM50	00	63	3KM52	00	63
3NE1 820-0	80	690	gS	000	25	3KM52	00	80	--	--	--
3NE3 221	100	1000	aR	1	35	3KM55	1	90	3KM57	2	95
3NE3 222	125	1000	aR	1	50	3KM55	1	110	3KM57	2	115
3NE3 224	160	1000	aR	1	70	3KM55	1	140	3KM57	2	150
3NE3 225	200	1000	aR	1	95	3KM55	1	175	3KM57	2	180
3NE3 227	250	1000	aR	1	120	3KM55	1	210	3KM57	2	220
3NE3 230-0B	315	1000	aR	1	185	3KM57	2	240	--	--	--
3NE3 231	350	1000	aR	1	240	3KM57	2	265	--	--	--
3NE3 232-0B	400	1000	aR	1	240	3KM57	2	290	--	--	--
3NE3 233	450	1000	aR	1	2x 150	3KM57	2	320	--	--	--
3NE3 332-0B	400	1000	aR	2	240	3KM57	2	290	--	--	--
3NE3 333	450	1000	aR	2	2x 150	3KM57	2	320	--	--	--
3NE3 334-0B	500	1000	aR	2	2x 150	3KM57	2	360	--	--	--
3NE3 335	560	1000	aR	2	2x 185	3KM57	2	400	--	--	--
3NE3 336	630	1000	aR	2	2x 185	3KM57	2	400	--	--	--
3NE3 337-8	710	900	aR	2	2x (40x5)	3KM57	2	400	--	--	--
3NE3 338-8	800	800	aR	2	2x 240	3KM57	2	400	--	--	--
3NE3 340-8	900	690	aR	2	2x (40x8)	3KM57	2	400	--	--	--
3NE4 101	32	1000	gR	0	6	3KM55	1	32	--	--	--
3NE4 102	40	1000	gR	0	10	3KM55	1	40	--	--	--
3NE4 117	50	1000	gR	0	10	3KM55	1	50	--	--	--
3NE4 118	63	1000	aR	0	16	3KM55	1	63	--	--	--
3NE4 120	80	1000	aR	0	25	3KM55	1	80	--	--	--
3NE4 121	100	1000	aR	0	35	3KM55	1	95	--	--	--
3NE4 122	125	1000	aR	0	50	3KM55	1	120	--	--	--
3NE4 124	160	1000	aR	0	70	3KM55	1	150	--	--	--
3NE4 327-0B	250	800	aR	2	150	3KM57	2	175	--	--	--
3NE4 330-0B	315	800	aR	2	240	3KM57	2	230	--	--	--
3NE4 333-0B	450	800	aR	2	2x (30x5)	3KM57	2	340	--	--	--
3NE4 334-0B	500	800	aR	2	2x (30x5)	3KM57	2	380	--	--	--
3NE4 337	710	800	aR	2	2x (50x5)	3KM57	2	400	--	--	--
3NE8 015-1	25	690	gR	00	4	3KM50	00	25	3KM52	00	25
3NE8 003-1	35	690	gR	00	6	3KM50	00	33	3KM52	00	35
3NE8 017-1	50	690	gR	00	10	3KM50	00	45	3KM52	00	50
3NE8 018-1	63	690	gR	00	16	3KM50	00	54	3KM52	00	60
3NE8 020-1	80	690	aR	00	25	3KM52	00	68	--	--	--
3NE8 021-1	100	690	aR	00	35	3KM52	00	89	--	--	--
3NE8 022-1	125	690	aR	00	50	3KM52	00	106	--	--	--
3NE8 024-1	160	690	aR	00	70	3KM52	00	130⁴⁾	--	--	--

¹⁾ Due to the mechanical stress on the relatively long fuse blades, SITOR 3NE4 1 fuses should only be switched occasionally and only at zero current.

²⁾ Fuses with a rated voltage >690 V may only be operated at max. 690V (rated voltage of the 3KM) when installed in 3KM

³⁾ In the case of cyclic loads, the currents may have to be reduced again (precise values on request).

⁴⁾ The fuse can also be operated at a higher rated uninterrupted current than the 125 A current of the 3KM52. However, in this case, the 3KM52 must not be switched under load (utilization category AC-20)

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