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Fuses

Switch disconnectors with NP1 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 3NP1. 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 3NP1 fuse switch disconnectors: Assignment table

SITOR fuse data						Permissible rated currents of fuse when installed in 3KM for busbar mounting
						3NP1 for floor mounting			3NP1 for busbar mounting
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) 4)}
	A	V AC			mm?			A			A

3NC2 423. .	150	500	gR	3	70	3NP1 163	3	140	3NP1 163	3	150
3NC2 425. .	200	500	gR	3	95	3NP1 163	3	175	3NP1 163	3	190
3NC2 427. .	250	500	gR	3	120	3NP1 163	3	220	3NP1 163	3	237
3NC2 428. .	300	500	gR	3	185	3NP1 163	3	250	3NP1 163	3	285
3NC2 431. .	350	500	gR	3	240	3NP1 163	3	320	3NP1 163	3	332
3NC2 432. .	400	500	aR	3	240	3NP1 163	3	370	3NP1 163	3	380
3NC3 336-1	630	1000	aR	3	2x (40x5)	3NP1 163	3	500	3NP1 163	3	500
3NC3 430-1	315	1250	aR	3	2x95	3NP1 163	3	280	3NP1 163	3	285
3NC3 432-1	400	1250	aR	3	2x120	3NP1 163	3	340	3NP1 163	3	340
3NC3 434-1	500	1250	aR	3	2x150	3NP1 163	3	400	3NP1 163	3	425
3NC3 436-1	630	1250	aR	3	2x (40x5)	3NP1 163	3	460	3NP1 163	3	535
3NC8 423..	150	660	gR	3	70	3NP1 163	3	120	3NP1 163	3	140
3NC8 425..	200	660	gR	3	95	3NP1 163	3	160	3NP1 163	3	190
3NC8 427..	250	660	gR	3	120	3NP1 163	3	200	3NP1 163	3	240
3NC8 431..	350	660	gR	3	240	3NP1 163	3	270	3NP1 163	3	300
3NC8 434..	500	660	gR	3	2x 150	3NP1 163	3	385	3NP1 163	3	385
3NE1 020-2	80	690	gR	00	25	3NP1 133	00	80	3NP1 133	00	80
3NE1 021-0	100	690	gS	00	35	3NP1 133	00	100	3NP1 133	00	100
3NE1 021-2	100	690	gR	00	35	3NP1 133	00	95	3NP1 133	00	95
3NE1 022-0	125	690	gS	00	50	3NP1 133	00	120	3NP1 133	00	120
3NE1 022-2	125	690	gR	00	50	3NP1 133	00	115	3NP1 133	00	115
3NE1 224-0	160	690	gS	1	70	3NP1 143	1	160	3NP1 143	1	160
	--	--	--	--	--	3NP1 153	2	160	3NP1 153	2	160
3NE1 224-2/-3	160	690	gR	1	70	3NP1 143	1	150	3NP1 143	1	152
	--	--	--	--	--	3NP1 153	2	200	3NP1 153	2	200
3NE1 224-2/-3	160	690	gR	1	70	3NP1 143	1	150	3NP1 143	1	152
	--	--	--	--	--	3NP1 153	2	160	3NP1 153	2	160
3NE1 225-2/-3	200	690	gR	1	95	3NP1 143	1	180	3NP1 143	1	180
	--	--	--	--	--	3NP1 153	2	190	3NP1 153	2	190
3NE1 227-0	250	690	gS	1	120	3NP1 143	1	235	3NP1 143	1	238
	--	--	--	--	--	3NP1 153	2	250	3NP1 153	2	250
3NE1 227-2/-3	250	690	gR	1	120	3NP1 143	1	220	3NP1 143	1	213
	--	--	--	--	--	3NP1 153	2	235	3NP1 153	2	235
3NE1 230-0	315	690	gS	1	2x 70	3NP1 153	2	290	3NP1 153	2	315
3NE1 230-2/-3	315	690	gR	1	2x 70	3NP1 153	2	278	3NP1 153	2	315
	--	--	--	--	--	3NP1 163	3	380	3NP1 163	3	400
3NE1 331-0	350	690	gS	2	2x 95	3NP1 153	2	315	3NP1 153	2	350
	--	--	--	--	--	3NP1 163	3	340	3NP1 163	3	350
3NE1 331-2/-3	350	690	gR	2	2x 95	3NP1 153	2	300	3NP1 153	2	330
	--	--	--	--	--	3NP1 163	3	330	3NP1 163	3	350
3NE1 332-0	400	690	gS	2	2x 95	3NP1 153	2	340	3NP1 153	2	380
3NE1 332-2/-3	400	690	gR	2	2x 95	3NP1 153	2	328	3NP1 153	2	360
	--	--	--	--	--	3NP1 163	3	370	3NP1 163	3	400
3NE1 333-0	450	690	gS	2	2x 120	3NP1 163	3	450	3NP1 163	3	430
3NE1 333-2/-3	450	690	gR	2	2x 120	3NP1 163	3	430	3NP1 163	3	420
3NE1 334-0	500	690	gS	2	2x 120	3NP1 163	3	500	3NP1 163	3	450
3NE1 334-2/-3	500	690	gR	2	2x 120	3NP1 163	3	475	3NP1 163	3	450
3NE1 435-0	560	690	gS	3	2x 150	3NP1 163	3	560	3NP1 163	3	520
3NE1 435-2/-3	560	690	gR	3	2x 150	3NP1 163	3	555	3NP1 163	3	510
3NE1 436-0	630	690	gS	3	2x 185	3NP1 163	3	630	3NP1 163	3	585
3NE1 436-2/-3	630	690	gR	3	2x 185	3NP1 163	3	620	3NP1 163	3	570
3NE1 437-0	710	690	gS	3	2x (40x5)	--	--	--	3NP1 163	3	605
3NE1 437-1	710	600	gR	3	2x (40x5)	--	--	--	3NP1 163	3	590
3NE1 437-2/-3	710	690	gR	3	2x (40x5)	--	--	--	3NP1 163	3	580
3NE1 438-0	800	690	gS	3	2x (50x5)	--	--	--	3NP1 163	3	630
3NE1 438-1	800	600	gR	3	2x (50x5)	--	--	--	3NP1 163	3	610
3NE1 438-2/-3	800	690	gR	3	2x (50x5)	--	--	--	3NP1 163	3	600
3NE1 447-2/-3	670	690	gR	3	2x (40x5)	--	--	--	3NP1 163	3	575
3NE1 448-2/-3	850	690	gR	3	2x (40x8)	--	--	--	3NP1 163	3	630
3NE1 802-0	40	690	gS	000	10	3NP1 123	000	40	3NP1 123	000	40
	--	--	--	--	--	3NP1 133	00	40	3NP1 133	00	40
3NE1 803-0	35	690	gS	000	6	3NP1 123	000	35	3NP1 123	000	35
	--	--	--	--	--	3NP1 133	00	35	3NP1 133	00	35
3NE1 813-0	16	690	gS	000	1,5	3NP1 123	000	16	3NP1 123	000	16
	--	--	--	--	--	3NP1 133	00	16	3NP1 133	00	16
3NE1 814-0	20	690	gS	000	2,5	3NP1 123	000	20	3NP1 123	000	20
	--	--	--	--	--	3NP1 133	00	20	3NP1 133	00	20
3NE1 815-0	25	690	gS	000	4	3NP1 123	000	25	3NP1 123	000	25
	--	--	--	--	--	3NP1 133	00	25	3NP1 133	00	25
3NE1 817-0	50	690	gS	000	10	3NP1 123	000	50	3NP1 123	000	50
	--	--	--	--	--	3NP1 133	00	50	3NP1 133	00	50
3NE1 818-0	63	690	gS	000	16	3NP1 123	000	63	3NP1 123	000	63
	--	--	--	--	--	3NP1 133	00	63	3NP1 133	00	63
3NE1 820-0	80	690	gS	000	25	3NP1 123	000	80	3NP1 123	000	80
	--	--	--	--	--	3NP1 133	00	80	3NP1 133	00	80
3NE3 221	100	1000	aR	1	35	3NP1 143	1	88	3NP1 143	1	95
	--	--	--	--	--	3NP1 153	2	95	3NP1 153	2	100
3NE3 222	125	1000	aR	1	50	3NP1 143	1	102	3NP1 143	1	113
	--	--	--	--	--	3NP1 153	2	110	3NP1 153	2	125
3NE3 224	160	1000	aR	1	70	3NP1 143	1	130	3NP1 143	1	140
	--	--	--	--	--	3NP1 153	2	140	3NP1 153	2	150
3NE3 225	200	1000	aR	1	95	3NP1 143	1	163	3NP1 143	1	170
	--	--	--	--	--	3NP1 153	2	175	3NP1 153	2	180
3NE3 227	250	1000	aR	1	120	3NP1 143	1	195	3NP1 143	1	200
	--	--	--	--	--	3NP1 153	2	210	3NP1 153	2	215
3NE3 230-0B	315	1000	aR	1	185	3NP1 153	2	270	3NP1 153	2	265
3NE3 231	350	1000	aR	1	240	3NP1 153	2	290	3NP1 153	2	280
3NE3 232-0B	400	1000	aR	1	240	3NP1 153	2	320	3NP1 153	2	310
3NE3 233	450	1000	aR	1	2x 150	3NP1 153	2	360	3NP1 153	2	330
3NE3 332-0B	400	1000	aR	2	240	3NP1 153	2	330	3NP1 163	3	360
	--	--	--	--	--	3NP1 163	3	360	--	--	--
3NE3 333	450	1000	aR	2	2x 150	3NP1 163	3	375	3NP1 163	3	390
3NE3 334-0B	500	1000	aR	2	2x 150	3NP1 163	3	420	3NP1 163	3	415
3NE3 335	560	1000	aR	2	2x 185	3NP1 163	3	475	3NP1 163	3	460
3NE3 336	630	1000	aR	2	2x 185	3NP1 163	3	540	3NP1 163	3	500
3NE3 337-8	710	900	aR	2	2x (40x5)	3NP1 163	3	580	3NP1 163	3	500
3NE3 338-8	800	800	aR	2	2x 240	3NP1 163	3	605	3NP1 163	3	500
3NE3 340-8	900	690	aR	2	2x (40x8)	3NP1 163	3	630	3NP1 163	3	500
3NE4 101	32	1000	gR	0	6	3NP1 143	1	30	3NP1 143	1	32
3NE4 102	40	1000	gR	0	10	3NP1 143	1	35	3NP1 143	1	40
3NE4 117	50	1000	gR	0	10	3NP1 143	1	42	3NP1 143	1	50
3NE4 118	63	1000	aR	0	16	3NP1 143	1	55	3NP1 143	1	60
3NE4 120	80	1000	aR	0	25	3NP1 143	1	71	3NP1 143	1	76
3NE4 121	100	1000	aR	0	35	3NP1 143	1	84	3NP1 143	1	93
3NE4 122	125	1000	aR	0	50	3NP1 143	1	107	3NP1 143	1	115
3NE4 124	160	1000	aR	0	70	3NP1 143	1	134	3NP1 143	1	144
3NE4 327-0B	250	800	aR	2	150	3NP1 153	2	195	3NP1 163	3	220
	--	--	--	--	--	3NP1 163	3	215	3NP1 163	3	220
3NE4 330-0B	315	800	aR	2	240	3NP1 153	2	240	3NP1 163	3	255
	--	--	--	--	--	3NP1 163	3	270	--	--	--
3NE4 333-0B	450	800	aR	2	2x (30x5)	3NP1 163	3	370	3NP1 163	3	355
3NE4 334-0B	500	800	aR	2	2x (30x5)	3NP1 163	3	410	3NP1 163	3	390
3NE4 337	710	800	aR	2	2x (50x5)	3NP1 163	3	540	3NP1 163	3	500
3NE8 015-1	25	690	gR	00	4	3NP1 133	00	25	3NP1 133	00	25
3NE8 003-1	35	690	gR	00	6	3NP1 133	00	32	3NP1 133	00	35
3NE8 017-1	50	690	gR	00	10	3NP1 133	00	43	3NP1 133	00	50
3NE8 018-1	63	690	gR	00	16	3NP1 133	00	52	3NP1 133	00	60
3NE8 020-1	80	690	aR	00	25	3NP1 133	00	65	3NP1 133	00	72
3NE8 021-1	100	690	aR	00	35	3NP1 133	00	85	3NP1 133	00	85
3NE8 022-1	125	690	aR	00	50	3NP1 133	00	100	3NP1 133	00	100
3NE8 024-1	160	690	aR	00	70	3NP1 133	00	120	3NP1 133	00	115

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. must not be switched under load

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

⁴⁾ Values apply if used with 30 x 10 mm rails;
for size 00: 12 x 5 mm and top busbar connection - values for other configurations available on request

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