Current Transformers: Bushing, Auxiliary

Class 4210 / Refer to Catalog 4210CT9701

Obsolete—January 1, 2023 Bushing Current Transformers 50–400 Hz

Models 780 R, 781R, 785R, and 786R

Dimensions for Models 780R, 781R, 785R, and 786R

Model	T (inches)
780R 781R 785R 786R	3.38 3.38 6.75 6.75

Model

T (inches)

780R

781R

785R

786R

3.38

6.75

Mounting Brackets

Model		Bracket
2NR		MB1
5NR		MB1
7RL		MB7
54R		Included
64R		MB10
66R		MB12
74R		MB16
76R		MB18
81X		MB81
100R		MB31
110R		MB32
120R		MB31
140R		MB32
151R		MB30
152R
170R
180R		MB9
200R		Included
201R
202R
203R
210R		MB32
260R		Not Available
270R
273

Bushing Current Transformers

Window Size (inches)	Catalog Number	Current Rating ^[1] (Amperes)	Relay Class	ANSI Accuracy Classification—60 Hz Metering Class					Rating Factor 30^oC Ambient
Window Size (inches)	Catalog Number	Current Rating ^[1] (Amperes)	Relay Class	B-0.1	B-0.2	B-0.5	B-0.9	B-1.8	Rating Factor 30^oC Ambient
6-1⁄2	780R500	50:5	—	—	—	—	—	—	2.0
	780R750	75:5	C10	1.2	2.4	—	—	—
	780R101	100:5	C10	2.4	2.4	—	—	—
	780R151	150:5	C20	0.6	1.2	—	—	—
	780R201	200:5			1.2	2.4	—	—
	780R251	250:5			0.6	1.2	2.4	—
	780R301	300:5	C50	0.3	0.6	1.2	1.2	2.4
	780R401	400:5			0.3	0.6	1.2	1.2
	780R501	500:5				0.6	0.6	1.2
	780R601	600:5	C100			0.3	0.6	0.6
	780R751	750:5					0.3
	780R801	800:5
	780R102	1000:5						0.3
	780R122	1200:5	C200
	780R152	1500:5
	780R162	1600:5
	780R202	2000:5
	780R252	2500:5
	780R302	3000:5
	780R402	4000:5							1.5
6-1⁄2	781R601	600:5 MR	C100				0.6	0.6	2.0
	781R122	1200:5 MR	C200				0.3	0.3
	781R202	2000:5 MR
	781R302	3000:5 MR
	781R402	4000:5 MR							1.5
6-1⁄2	785R500	50:5	C10	2.4	2.4	—	—	—	2.0
	785R750	75:5	C20	1.2	1.2	—	—	—
	785R101	100:5	C20	1.2	1.2	2.4	—	—
	785R151	150:5	C50	0.6	0.6	1.2	2.4	—
	785R201	200:5		0.6			2.4	2.4
	785R251	250:5		0.3			1.2	2.4
	785R301	300:5	C100		0.3	0.6	0.6	1.2
	785R401	400:5				0.3		1.2
	785R501	500:5						0.6
	785R601	600:5	C200				0.3	0.6
	785R751	750:5						0.3
	785R801	800:5
	785R102	1000:5
	785R122	1200:5	C400
	785R152	1500:5
	785R162	1600:5
	785R202	2000:5
	785R252	2500:5
	785R302	3000:5
	785R402	4000:5							1.5
6-1⁄2	786R601	600:5 MR	C200						2.0
	786R122	1200:5 MR	C400
	786R202	2000:5 MR
	786R302	3000:5 MR
	786R402	4000:5 MR							1.5

Obsolete—January 1, 2023 Auxiliary Current Transformers

Model 81X

Auxiliary Current Transformers

Catalog Number (without brackets)	Ratio
81X05000100 81X05000200 81X05000250 81X05000500 81X07500500 81X10000500 81X12500500 81X15000500	5:1 5:2 5:2.5 5:5 7.5:5 10:5 12.5:5 15:5

Catalog Number
(without brackets)

Ratio

81X05000100

81X05000200

81X05000250

81X05000500

81X07500500

81X10000500

81X12500500

81X15000500

5:1

5:2

5:2.5

5:5

7.5:5

10:5

12.5:5

15:5

note

Model 81X Accuracy 0.3B0.1, B0.2, B0.5@60 Hz, RF=1.5@30 ^oC

Supplemental 6: Transformers