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Spool Insulator

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ISO 9001

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US Units
Metric Units

US Units

Catalog No.	Class ANSI	Fig	Main Dimensions							Mechanical Value	G.W./N.W.
			H	h	D	d	d1	d2	R	Mechanical Failing Load	G.W./N.W.
			inch	inch	inch	inch	inch	inch	inch	lbs	lbs
MPI 531	53-1	1	2.13	1.06	2.24	1.77	0.71	0.87	0.43	2.000	66.14/61.73
MPI 532	53-2	2	2.99	1.50	3.11	1.77	0.71	0.94	0.71	3.000	74.96/70.55
MPI 533	53-3	3	3.19	1.59	2.99	1.77	0.71	0.94	0.43	4.000	85.98/81.57
MPI 534	53-4	4	2.99	1.50	4.13	2.87	0.71	0.94	0.63	4.500	63.93/59.52
MPI 535	53-5	4	4.13	20.67	4.02	2.87	0.71	0.94	0.43	6.000	70.55/66.14

Catalog No.	Class ANSI	Fig	Electrical Values
			Low-Frequency Flashover
			Dry/ kV	Wet Vertical/ kV	Wet Horizontal/ kV
MPI 521	52-1	1	20	8	10
MPI 522	52-2	2	25	12	15
MPI 523	52-3	3	25	12	15
MPI 524	52-4	4	25	12	15
MPI 525	52-5	4	35	18	25

Catalog No.	Class ANSI	Fig	Packing & Shipping Data
			Net Weight Each	Packed Weight Each	Standard Package Quantity
			lbs	lbs	Standard Package Quantity
MPI 521	52-1	1	0.44	0.46	100
MPI 522	52-2	2	1.14	1.20	50
MPI 523	52-3	3	1.21	1.38	40
MPI 524	52-4	4	2.42	2.56	18
MPI 525	52-5	4	2.65	2.72	18

Metric Units

Catalog No.	Class ANSI	Fig	Main Dimensions							Mechanical Value	G.W./N.W.
			H	h	D	d	d1	d2	R	Mechanical Failing Load	G.W./N.W.
			mm	mm	mm	mm	mm	mm	mm	kg	kg
MPI 531	53-1	1	54	27	57	45	18	22	11	907.18	30/28
MPI 532	53-2	2	76	38	79	45	18	24	18	1360.78	34/32
MPI 533	53-3	3	81	40.5	76	45	18	24	11	1814.37	39/37
MPI 534	53-4	4	76	38	105	73	18	24	16	2041.17	29/27
MPI 535	53-5	4	105	52.5	102	73	18	24	11	2721.55	32/30

Catalog No.	Class ANSI	Fig	Electrical Values
			Low-Frequency Flashover
			Dry/ kV	Wet Vertical/ kV	Wet Horizontal/ kV
MPI 521	52-1	1	20	8	10
MPI 522	52-2	2	25	12	15
MPI 523	52-3	3	25	12	15
MPI 524	52-4	4	25	12	15
MPI 525	52-5	4	35	18	25

Catalog No.	Class ANSI	Fig	Packing & Shipping Data
			Net Weight Each	Packed Weight Each	Standard Package Quantity
			kg	kg	Standard Package Quantity
MPI 521	52-1	1	0.01732283	0.02	100
MPI 522	52-2	2	0.04488189	0.0472441	50
MPI 523	52-3	3	0.0476378	0.05	40
MPI 524	52-4	4	0.09527559	0.10	18
MPI 525	52-5	4	0.1043307	0.11	18