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Fuses

3NP5 fuse switch disconnectors 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 3NP5. 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 In	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
3NC2 423. .	150	500	gR	3	70	3NP5 4	3	145	--		--	--
3NC2 425. .	200	500	gR	3	95	3NP5 4	3	180	--		--	--
3NC2 427. .	250	500	gR	3	120	3NP5 4	3	225	--		--	--
3NC2 428. .	300	500	gR	3	185	3NP5 4	3	255	--		--	--
3NC2 431. .	350	500	gR	3	240	3NP5 4	3	330	--		--	--
3NC2 432. .	400	500	aR	3	240	3NP5 4	3	400	--		--	--
3NC3 336-1	630	1000	aR	3	2x (40x5)	3NP5 4	3	530	--		--	--
3NC3 337-1	710	1000	aR	3	2x (50x5)	3NP5 4	3	570	--		--	--
3NC3 338-1	800	1000	aR	3	2x (40x8)	3NP5 4	3	630	--		--	--
3NC3 340-1	900	1000	aR	3	2x (40x8)	3NP5 4	3	700⁴⁾	--		--	--
3NC3 341-1	1000	1000	aR	3	2x (50x8)	3NP5 4	3	770⁴⁾	--		--	--
3NC3 342-1	1100	800	aR	3	2x (50x8)	3NP5 4	3	800⁴⁾	--		--	--
3NC3 343-1	1250	800	aR	3	2x (50x8)	3NP5 4	3	850⁴⁾	--		--	--
3NC3 430-1	315	1250	aR	3	2x95	3NP5 4	3	295	--		--	--
3NC3 432-1	400	1250	aR	3	2x120	3NP5 4	3	355	--		--	--
3NC3 434-1	500	1250	aR	3	2x150	3NP5 4	3	440	--		--	--
3NC3 436-1	630	1250	aR	3	2x (40x5)	3NP5 4	3	520	--		--	--
3NC3 438-1	800	1100	aR	3	2x (40x8)	3NP5 4	3	625	--		--	--
3NC8 423..	150	660	gR	3	70	3NP5 4	3	135	--		--	--
3NC8 425..	200	660	gR	3	95	3NP5 4	3	180	--		--	--
3NC8 427..	250	660	gR	3	120	3NP5 4	3	225	--		--	--
3NC8 431..	350	660	gR	3	240	3NP5 4	3	300	--		--	--
3NC8 434..	500	660	gR	3	2x 150	3NP5 4	3	425	--		--	--
3NC8 444..	1000	600	aR	3	2x (60x6)	3NP5 4	3	800⁴⁾	--		--	--
3NE1 020-2	80	690	gR	00	25	3NP5 0	00	80	--		--	--
3NE1 021-0	100	690	gS	00	35	3NP5 0	00	100	--		--	--
3NE1 021-2	100	690	gR	00	35	3NP5 0	00	100	--		--	--
3NE1 022-0	125	690	gS	00	50	3NP5 0	00	125	--		--	--
3NE1 022-2	125	690	gR	00	50	3NP5 0	00	125	--		--	--
3NE1 224-0	160	690	gS	1	70	3NP5 2	1	160	3NP5 3		2	160
3NE1 224-2/-3	160	690	gR	1	70	3NP5 2	1	160	3NP5 3		2	160
3NE1 225-0	200	690	gS	1	95	3NP5 2	1	200	3NP5 3		2	200
3NE1 225-2	200	690	gR	1	95	3NP5 2	1	200	3NP5 3		2	200
3NE1225-3	200	690	gR	1	95	3NP5 2	1	190	3NP5 3		2	200
3NE1 227-0	250	690	gS	1	120	3NP5 2	1	250	3NP5 3		2	250
3NE1 227-2	250	690	gR	1	120	3NP5 2	1	250	3NP5 3		2	250
3NE1 227-3	250	690	gR	1	120	3NP5 2	1	235	3NP5 3		2	250
3NE1 230-0	315	690	gS	1	2x 70	3NP5 3	2	315	--		--	--
3NE1 230-2/-3	315	690	gR	1	2x 70	3NP5 3	2	315	--		--	--
3NE1 331-0	350	690	gS	2	2x 95	3NP5 3	2	350	3NP5 4		3	350
3NE1 331-2/-3	350	690	gR	2	2x 95	3NP5 3	2	350	3NP5 4		3	350
3NE1 332-0	400	690	gS	2	2x 95	3NP5 3	2	400	3NP5 4		3	400
3NE1 332-2/-3	400	690	gR	2	2x 95	3NP5 3	2	400	3NP5 4		3	400
3NE1 333-0	450	690	gS	2	2x 120	3NP5 4	3	450	--		--	--
3NE1 333-2/-3	450	690	gR	2	2x 120	3NP5 4	3	450	--		--	--
3NE1 334-0	500	690	gS	2	2x 120	3NP5 4	3	500	--		--	--
3NE1 334-2/-3	500	690	gR	2	2x 120	3NP5 4	3	500	--		--	--
3NE1 435-0	560	690	gS	3	2x 150	3NP5 4	3	560	--		--	--
3NE1 435-2/-3	560	690	gR	3	2x 150	3NP5 4	3	560	--		--	--
3NE1 436-0	630	690	gS	3	2x 185	3NP5 4	3	630	--		--	--
3NE1 436-2/-3	630	690	gR	3	2x 185	3NP5 4	3	625	--		--	--
3NE1 437-0	710	690	gS	3	2x (40x5)	3NP5 4	3	710⁴⁾	--		--	--
3NE1 437-1	710	600	gR	3	2x (40x5)	3NP5 4	3	690⁴⁾	--		--	--
3NE1 437-2/-3	710	690	gR	3	2x (40x5)	3NP5 4	3	685⁴⁾	--		--	--
3NE1 438-0	800	690	gS	3	2x (50x5)	3NP5 4	3	800⁴⁾	--		--	--
3NE1 438-1	800	600	gR	3	2x (50x5)	3NP5 4	3	7504)	--		--	--
3NE1 438-2/-3	800	690	gR	3	2x (50x5)	3NP5 4	3	770⁴⁾	--		--	--
3NE1 447-2/-3	670	690	gR	3	2x (40x5)	3NP5 4	3	655⁴⁾	--		--	--
3NE1 448-2/-3	850	690	gR	3	2x (40x8)	3NP5 4	3	820⁴⁾	--		--	--
3NE1 802-0	40	690	gS	000	10	3NP5 0	00	40	--		--	--
3NE1 803-0	35	690	gS	000	6	3NP5 0	00	35	--		--	--
3NE1 813-0	16	690	gS	000	1.5	3NP5 0	00	16	--		--	--
3NE1 814-0	20	690	gS	000	2.5	3NP5 0	00	20	--		--	--
3NE1 815-0	25	690	gS	000	4	3NP5 0	00	25	--		--	--
3NE1 817-0	50	690	gS	000	10	3NP5 0	00	50	--		--	--
3NE1 818-0	63	690	gS	000	16	3NP5 0	00	63	--		--	--
3NE1 820-0	80	690	gS	000	25	3NP5 0	00	80	--		--	--
3NE3 221	100	1000	aR	1	35	3NP5 2	1	95	3NP5 3		2	100
3NE3 222	125	1000	aR	1	50	3NP5 2	1	110	3NP5 3		2	120
3NE3 224	160	1000	aR	1	70	3NP5 2	1	140	3NP5 3		2	150
3NE3 225	200	1000	aR	1	95	3NP5 2	1	175	3NP5 3		2	190
3NE3 227	250	1000	aR	1	120	3NP5 2	1	210	3NP5 3		2	230
3NE3 230-0B	315	1000	aR	1	185	3NP5 3	2	285	--		--	--
3NE3 231	350	1000	aR	1	240	3NP5 3	2	310	--		--	--
3NE3 232-0B	400	1000	aR	1	240	3NP5 3	2	330	--		--	--
3NE3 233	450	1000	aR	1	2x 150	3NP5 3	2	360	--		--	--
3NE3 332-0B	400	1000	aR	2	240	3NP5 4	3	360	--		--	--
3NE3 333	450	1000	aR	2	2x 150	3NP5 4	3	400	--		--	--
3NE3 334-0B	500	1000	aR	2	2x 150	3NP5 4	3	450	--		--	--
3NE3 335	560	1000	aR	2	2x 185	3NP5 4	3	510	--		--	--
3NE3 336	630	1000	aR	2	2x 185	3NP5 4	3	580	--		--	--
3NE3 337-8	710	900	aR	2	2x (40x5)	3NP5 4	3	630	--		--	--
3NE3 338-8	800	800	aR	2	2x 240	3NP5 4	3	630	--		--	--
3NE3 340-8	900	690	aR	2	2x (40x8)	3NP5 4	3	630	--		--	--
3NE4 101	32	1000	gR	0	6	3NP5 2	1	32	--		--	--
3NE4 102	40	1000	gR	0	10	3NP5 2	1	40	--		--	--
3NE4 117	50	1000	gR	0	10	3NP5 2	1	50	--		--	--
3NE4 118	63	1000	aR	0	16	3NP5 2	1	63	--		--	--
3NE4 120	80	1000	aR	0	25	3NP5 2	1	80	--		--	--
3NE4 121	100	1000	aR	0	35	3NP5 2	1	95	--		--	--
3NE4 122	125	1000	aR	0	50	3NP5 2	1	120	--		--	--
3NE4 124	160	1000	aR	0	70	3NP5 2	1	150	--		--	--
3NE4 327-0B	250	800	aR	2	150	3NP5 3	2	210	3NP5 4		3	220
3NE4 330-0B	315	800	aR	2	240	3NP5 3	2	270	3NP5 4		3	285
3NE4 333-0B	450	800	aR	2	2x (30x5)	3NP5 3	2	400	3NP5 4		3	420
3NE4 334-0B	500	800	aR	2	2x (30x5)	3NP5 4	3	450	--		--	--
3NE4 337	710	800	aR	2	2x (50x5)	3NP5 4	3	600	--		--	--
3NE8 015-1	25	690	gR	00	4	3NP5 0	00	25	--		--	--
3NE8 003-1	35	690	gR	00	6	3NP5 0	00	33	--		--	--
3NE8 017-1	50	690	gR	00	10	3NP5 0	00	45	--		--	--
3NE8 018-1	63	690	gR	00	16	3NP5 0	00	54	--		--	--
3NE8 020-1	80	690	aR	00	25	3NP5 0	00	68	--		--	--
3NE8 021-1	100	690	aR	00	35	3NP5 0	00	89	--		--	--
3NE8 022-1	125	690	aR	00	50	3NP5 0	00	106	--		--	--
3NE8 024-1	160	690	aR	00	70	3NP5 0	00	130	--		--	--

¹⁾ Due to the mechanical stress on the relatively long fuse blades, SITOR 3NE41 fuses should only be switched occasionally and only at zero current.

²⁾ 3NP1 fuse switch disconnectors may be operated at up to 1000 V AC/DC with the following restrictions:
- Degree of pollution 2 (instead of 3)
- AC20/DC20 - i. e. switching only without load

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 630 A current of the 3NP54. However, in this case, the 3NP54 must not be switched under load (utilization category AC-20)

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