Marathon and Kulka Double Row General Information

General Information

Double row terminal blocks are available in seven basic line to line molding sizes. Some are available in either open or closed back designs. The basic material is phenolic, however thermoplastic is also available on certain sizes. Modifications are also provided on most terminal blocks, including marking strips.

Ratings and Standards

The voltage ratings of terminal blocks are based upon the minimum spacing between electrically conductive parts line to line, thorugh air and over surface and line to ground through air and over surface.

Class A
Service equipment including deadfront switchboards, panel boards, service entrance devices

Class B
Commercial appliances including business equipment, electronic data processing equipment and the like.

Class C
General industrial and machine tool controls, which can be defined as equipment falling under UL 1059

Ratings based on UL 1059 may be higher in some cases depending on application

Spacing Requirements (in inches)

	Voltage	Thru Air	Over Surface
Class A	51-150 151-300 301-600	.500 .750 1.000	.750 1.250 2.000
Class B	51-150 151-300 301-600	.063 .094 .375	.063 .094 .500
Class C	51-150 151-300 301-600	.125 .250 .375	.250 .375 .500

Reference Chart

Series	Amps	Volts	Base Materials	Max Wire Size for Screw	Screw Size	L to L	# of Lines	Features
100/670A	15	250	Phenolic	#18	6-32	.375	1-36	Closed Back
200/671	20	250	Phenolic	#12	6-32	.437	1-30	Closed Back
200HB	20	600	Phenolic	#12	6-32	.437	1-30	High Barrier/Closed Back
300/672	30	600	Phenolic	#10	8-32	.562	1-24	Closed Back
400	30	600	Phenolic	#10	10-32	.687	1-12	Closed Back
410	5	250	Phenolic	#18	2-56	.250	1-23	Open Back
600	20	300	Phenolic	#14	5-40	.375	1-22	Open Back
600A	20	300	Phenolic	#14	6-32	.375	1-22	Open Back
601	20	300	Phenolic	#14	6-32	.437	1-23	Open Back
602	30	300	Phenolic	#12	8-32	.562	1-26	Open Back
603	50	600	Phenolic	#10	10-32	.687	1-12	Open Back
604	70	600	Phenolic	#4	12-32	.875	1-8	Open Back
605	90	600	Phenolic	#2	1/4-28	1.125	1-6	Open Back
621RZ	20	600	Thermoplastic	#12	6-32	.437	1-30	High Barrier/Closed Back
670ARZ	20	250	Thermoplastic	#14	6-32	.375	1-30	High Barrier/Closed Back
671RZ	20	250	Thermoplastic	#12	6-32	.437	1-30	Closed Back
672RZ	30	600	Thermoplastic	#10	8-32	.562	1-24	Closed Back