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Fuses

The 3KL switch disconnectors with fuses are suitable for all fuses of the LV HRC design, see Protection devices > Fuse systems > LV HRC fuse systems or Protection devices > Fuse systems > SITOR semiconductor fuses.

Fuses for SITOR semiconductor protection in LV HRC design can also be used. It should be noted, however, that these become significantly hotter in operation compared to cable and line protection fuses. For this reason the fuse should, if necessary, be operated below its rated current In when installed in an enclosed switching device (derating).

The table below lists the permissible load currents of the SITOR fuses for installation in 3KL. The values have been determined using the connection cross-sections listed in the table.

Note

In the case of smaller cross sections, additional derating is necessary due to the inferior heat dissipation.

SITOR fuses for 3KL switch disconnectors with fuses: Assignment table

Data of the SITOR fuse						Permissible load currents of the fuse when installed in 3KL for floor mounting
						Type 3KL			Alternative type 3KL
Type¹⁾	Rated current I_n	Rated voltage ²⁾	Operational class 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	3KL61	3	145	3KL62	3	150
3NC2 425..	200	500	gR	3	95	3KL61	3	180	3KL62	3	190
3NC2 427..	250	500	gR	3	120	3KL61	3	225	3KL62	3	240
3NC2 428..	300	500	gR	3	185	3KL61	3	255	3KL62	3	270
3NC2 431..	350	500	gR	3	240	3KL61	3	330	3KL62	3	345
3NC2 432..	400	500	aR	3	240	3KL61	3	400	3KL62	3	400
3NC3 336-1	630	1000	aR	3	2x (40x5)	3KL62	3	500	3KL61	3	480
3NC3 337-1	710	1000	aR	3	2x (50x5)	3KL62	3	540	--	--	--
3NC3 338-1	800	1000	aR	3	2x (40x8)	3KL62	3	600	--	--	--
3NC3 340-1	900	1000	aR	3	2x (40x8)	3KL62	3	650	--	--	--
3NC3 341-1	1000	1000	aR	3	2x (50x8)	3KL62	3	720	--	--	--
3NC3 342-1	1100	800	aR	3	2x (50x8)	3KL62	3	800	--	--	--
3NC3 343-1	1250	800	aR	3	2x (50x8)	3KL62	3	800	--	--	--
3NC3 430-1	315	1250	aR	3	2x95	3KL61	3	285	3KL62	3	300
3NC3 432-1	400	1250	aR	3	2x120	3KL61	3	365	3KL62	3	380
3NC3 434-1	500	1250	aR	3	2x150	3KL61	3	425	3KL62	3	450
3NC3 436-1	630	1250	aR	3	2x (40x5)	3KL61	3	500	3KL62	3	540
3NC3 438-1	800	1100	aR	3	2x (40x8)	3KL62	3	650	--	--	--
3NC8 423..	150	660	gR	3	70	3KL61	3	135	3KL62	3	140
3NC8 425..	200	660	gR	3	95	3KL61	3	180	3KL62	3	190
3NC8 427..	250	660	gR	3	120	3KL61	3	225	3KL62	3	240
3NC8 431..	350	660	gR	3	240	3KL61	3	300	3KL62	3	315
3NC8 434..	500	660	gR	3	2x 150	3KL61	3	425	3KL62	3	450
3NC8 444..	1000	600	aR	3	2x (60x6)	3KL62	3	800	3KL61	3	630
3NE1 020-2	80	690	gR	00	25	3KL52	00	80	3KL53	00	80
3NE1 021-0	100	690	gS	00	35	3KL52	00	100	3KL53	00	100
3NE1 021-2	100	690	gR	00	35	3KL52	00	100	3KL53	00	100
3NE1 022-0	125	690	gS	00	50	3KL52	00	125	3KL53	00	125
3NE1 022-2	125	690	gR	00	50	3KL52	00	125	3KL53	00	125
3NE1 224-0	160	690	gS	1	70	3KL55	1	160	3KL57	2	160
3NE1 224-2/-3	160	690	gR	1	70	3KL55	1	160	3KL57	2	160
3NE1 225-0	200	690	gS	1	95	3KL55	1	200	3KL57	2	200
3NE1 225-2/-3	200	690	gR	1	95	3KL55	1	200	3KL57	2	200
3NE1 227-0	250	690	gS	1	120	3KL55	1	250	3KL57	2	250
3NE1 227-2/-3	250	690	gR	1	120	3KL55	1	245	3KL57	2	250
3NE1 230-0	315	690	gS	1	2x 70	3KL57	2	315	--	--	--
3NE1 230-2/-3	315	690	gR	1	2x 70	3KL57	2	280	--	--	--
3NE1 331-0	350	690	gS	2	2x 95	3KL57	2	330	3KL61	3	350
3NE1 331-2/-3	350	690	gR	2	2x 95	3KL57	2	300	3KL61	3	350
3NE1 332-0	400	690	gS	2	2x 95	3KL57	2	375	3KL61	3	400
3NE1 332-2/-3	400	690	gR	2	2x 95	3KL57	2	340	3KL61	3	400
3NE1 333-0	450	690	gS	2	2x 120	3KL61	3	450	3KL62	3	450
3NE1 333-2/-3	450	690	gR	2	2x 120	3KL61	3	450	3KL62	3	450
3NE1 334-0	500	690	gS	2	2x 120	3KL61	3	500	3KL62	3	500
3NE1 334-2/-3	500	690	gR	2	2x 120	3KL61	3	500	3KL62	3	500
3NE1 435-0	560	690	gS	3	2x 150	3KL61	3	560	3KL62	3	560
3NE1 435-2/-3	560	690	gR	3	2x 150	3KL61	3	560	3KL62	3	560
3NE1 436-0	630	690	gS	3	2x 185	3KL61	3	630	3KL62	3	630
3NE1 436-2/-3	630	690	gR	3	2x 185	3KL61	3	615	3KL62	3	630
3NE1 437-0	710	690	gS	3	2x (40x5)	3KL61	3	630	3KL62	3	710
3NE1 437-1	710	600	gR	3	2x (40x5)	3KL61	3	630	3KL62	3	710
3NE1 437-2/-3	710	690	gR	3	2x (40x5)	3KL61	3	630	3KL62	3	700
3NE1 438-0	800	690	gS	3	2x (50x5)	3KL61	3	630	3KL62	3	800
3NE1 438-1	800	600	gR	3	2x (50x5)	3KL61	3	630	3KL62	3	800
3NE1 438-2/-3	800	690	gR	3	2x (50x5)	3KL61	3	630	3KL62	3	760
3NE1 447-2/-3	670	690	gR	3	2x (40x5)	3KL61	3	630	3KL62	3	670
3NE1 448-2/-3	850	690	gR	3	2x (40x8)	3KL61	3	630	3KL62	3	790
3NE1 802-0	40	690	gS	000	10	3KL50	00	40	3KL52	00	40
3NE1 803-0	35	690	gS	000	6	3KL50	00	35	3KL52	00	35
3NE1 813-0	16	690	gS	000	1.5	3KL50	00	16	3KL52	00	16
3NE1 814-0	20	690	gS	000	2.5	3KL50	00	20	3KL52	00	20
3NE1 815-0	25	690	gS	000	4	3KL50	00	25	3KL52	00	25
3NE1 817-0	50	690	gS	000	10	3KL50	00	50	3KL52	00	50
3NE1 818-0	63	690	gS	000	16	3KL50	00	63	3KL52	00	63
3NE1 820-0	80	690	gS	000	25	3KL52	00	80	--	--	--
3NE3 221	100	1000	aR	1	35	3KL55	1	90	3KL57	2	95
3NE3 222	125	1000	aR	1	50	3KL55	1	110	3KL57	2	115
3NE3 224	160	1000	aR	1	70	3KL55	1	140	3KL57	2	150
3NE3 225	200	1000	aR	1	95	3KL55	1	175	3KL57	2	180
3NE3 227	250	1000	aR	1	120	3KL55	1	210	3KL57	2	220
3NE3 230-0B	315	1000	aR	1	185	3KL57	2	240	--	--	--
3NE3 231	350	1000	aR	1	240	3KL57	2	265	--	--	--
3NE3 232-0B	400	1000	aR	1	240	3KL57	2	290	--	--	--
3NE3 233	450	1000	aR	1	2x 150	3KL57	2	320	--	--	--
3NE3 332-0B	400	1000	aR	2	240	3KL61	3	340	3KL62	3	360
3NE3 333	450	1000	aR	2	2x 150	3KL61	3	380	3KL62	3	400
3NE3 334-0B	500	1000	aR	2	2x 150	3KL61	3	440	3KL62	3	470
3NE3 335	560	1000	aR	2	2x 185	3KL61	3	500	3KL62	3	530
3NE3 336	630	1000	aR	2	2x 185	3KL61	3	540	3KL62	3	580
3NE3 337-8	710	900	aR	2	2x (40x5)	3KL61	3	600	3KL62	3	640
3NE3 338-8	800	800	aR	2	2x 240	3KL61	3	630	3KL62	3	720
3NE3 340-8	900	690	aR	2	2x (40x8)	3KL61	3	630	3KL62	3	800
3NE4 101	32	1000	gR	0	6	3KL55	1	32	--	--	--
3NE4 102	40	1000	gR	0	10	3KL55	1	40	--	--	--
3NE4 117	50	1000	gR	0	10	3KL55	1	50	--	--	--
3NE4 118	63	1000	aR	0	16	3KL55	1	63	--	--	--
3NE4 120	80	1000	aR	0	25	3KL55	1	80	--	--	--
3NE4 121	100	1000	aR	0	35	3KL55	1	95	--	--	--
3NE4 122	125	1000	aR	0	50	3KL55	1	120	--	--	--
3NE4 124	160	1000	aR	0	70	3KL55	1	150	--	--	--
3NE4 327-0B	250	800	aR	2	150	3KL57	2	175	3KL61	3	200
3NE4 330-0B	315	800	aR	2	240	3KL57	2	230	3KL61	3	260
3NE4 333-0B	450	800	aR	2	2x (30x5)	3KL57	2	340	3KL61	3	370
3NE4 334-0B	500	800	aR	2	2x (30x5)	3KL61	3	425	3KL62	3	450
3NE4 337	710	800	aR	2	2x (50x5)	3KL61	3	600	3KL62	3	630
3NE8 015-1	25	690	gR	00	4	3KL50	00	25	3KL52	00	25
3NE8 003-1	35	690	gR	00	6	3KL50	00	33	3KL52	00	35
3NE8 017-1	50	690	gR	00	10	3KL50	00	45	3KL52	00	50
3NE8 018-1	63	690	gR	00	16	3KL50	00	54	3KL52	00	60
3NE8 020-1	80	690	aR	00	25	3KL52	00	68	--	--	--
3NE8 021-1	100	690	aR	00	35	3KL52	00	89	--	--	--
3NE8 022-1	125	690	aR	00	50	3KL52	00	106	--	--	--
3NE8 024-1	160	690	aR	00	70	3KL52	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. 690 V (rated voltage of the 3KL) when installed in 3KL.

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 3KL52. However, in this case, the 3KL52 must not be switched under load (utilization category AC-20).

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