Morstar Lightning Arrester

The Surge Arresters type MSLA were designed to operate in distribution systems, in tensions from 3 to 36 kV, It was specially designed to protect transformers, capacitors bank, primary stations, lines, extensions, against power surges in medium voltage distribution systems. The Metal Oxide Variation (MOV) is enclosed by a cage made of ECR fiberglass core, providing a rigid structure, ensuring high mechanical resistance. The silicone rubber housing, resistant to UV radiation and weather conditions in general is vulcanized directly on to the Metal Oxide Variation (MOV) blocks, the ECR fiberglass core and aluminum terminals, fully incorporating the components without leaving voids or gaps, providing an excellent system seal. It was equipped with automatic dis-connector whose performance curve coordinates the operation with 12k fuse links.

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Technical specification: Surge Arresters 5 kA and 10 kA for MV Systems to 36 kV

Normal Duty Protective Characteristics Type MSLA-05kA
Catalog number	Rated Voltage (Ur)	Maximum Continuous Operating Voltage MCOV (Uc)	Current impulse residual voltage			2000 µs Rectangular current impulse withstand	4/10µs High current impulse withstand	Creep age distance
			1/4µ s Steep Current impulse	8/20µ s Lightning current impulse	30/60µ s Switching current impulse
			1/4µ s Steep Current impulse	8/20µ s Lightning current impulse	30/60µ s Switching current impulse
	kV(rms)	kV(rms)	kV(crest)	kV(crest)	kV(crest)	A(crest)	kA(crest)	(mm)
MSLA-0503	3	2.55	9.5	9	7.7	150	65	335
MSLA-0506	6	5.1	19	18	15.4	150	65	335
MSLA-0509	9	7.65	28.5	27	23.1	150	65	450
MSLA-0510	10	8.3	36	30	27	150	65	450
MSLA-0512	12	10.2	38	36	30.8	150	65	550
MSLA-0515	15	12.7	47.5	45	38.5	150	65	550
MSLA-0518	18	15.3	57	54	46.2	150	65	650
MSLA-0521	21	17.0	66.5	63	53.9	150	65	750
MSLA-0524	24	19.5	76	72	61.6	150	65	850
MSLA-0527	27	21.9	85.5	81	69.3	150	65	950
MSLA-0530	30	24.4	95	90	76.5	150	65	1050
MSLA-0533	33	26.8	104	99	32.4	150	65	1160
MSLA-0536	36	29.0	114	108	100.1	150	65	1160

Notes:
1. Reduce creep age by 1.45 inches (36.8mm) when ordering without insulating bracket.
2. Weight does not include metal mounting hardware
3. MCOV = Maximum Continuous Operating Voltage that may be applied continuously between the terminal of the arrester.
4. The equivalent Front-of-Wave is the maximum discharge voltage for a 5kA impulse current wave which produces a voltage wave cresting in 0.5 μs.
5. Based on switching surge current impulse of 45x90 μs, 500 amperes.

High Duty Protective Characteristics Type MSLA-10kA
Catalog number	Rated Voltage (Ur)	Maximum Continuous Operating Voltage MCOV (Uc)	Current impulse residual voltage			2000 µs Rectangular current impulse withstand	4/10µs High current impulse withstand	Creep age distance	Dimension
			1/4µs Steep Current impulse	8/20µs Lightning current impulse	30/60µ s Switching current impulse				Dimension
			1/4µs Steep Current impulse	8/20µs Lightning current impulse	30/60µ s Switching current impulse				A
	kV(rms)	kV(rms)	kV(crest)	kV(crest)	kV(crest)	A(crest)	kA(crest)	(mm)	(mm)
MSLA-1003	3	2.55	9.5	9	7.7	250	100	335	230
MSLA-1006	6	5.1	19	18	15.4	250	100	335	230
MSLA-1009	9	7.65	28.5	27	23.1	250	100	450	260
MSLA-1010	10	8.3	36	30	27	250	100	450	260
MSLA-1012	12	10.2	38	36	30.8	250	100	550	290
MSLA-1015	15	12.7	47.5	45	38.5	250	100	550	290
MSLA-1018	18	15.3	47	54	46.2	250	100	650	320
MSLA-1021	21	17.0	66.5	63	53.9	250	100	750	350
MSLA-1024	24	19.5	76	72	61.6	250	100	850	380
MSLA-1027	27	21.9	85.5	81	69.3	250	100	950	410
MSLA-1030	30	24.4	95	90	76.5	250	100	1050	440
MSLA-1033	33	26.8	104.5	99	84.7	250	100	1160	470
MSLA-1036	36	29.0	114	108	92.4	250	100	1160	470

Notes:
1. Reduce creep age by 1.45 inches (36.8mm) when ordering without insulating bracket.
2. Weight does not include metal mounting hardware.
3. MCOV = Maximum Continuous Operating Voltage that may be applied continuously between the terminals of the arrester.
4. The equivalent Front-of-Wave is the maximum discharge voltage for a 10kA impulse current wave which produces a voltage wave cresting in 0.5 μs
5. Based on switching surge current impulse of 45x90 μs,500 amperes.

Morstar Lightning Arrester

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