Marathon and Kulka Single Row general Information

General Information

Single row terminal blocks are available in four basic line to line molding sizes. Some are available in either open or feed thru/printed circuit designs. The basic material is phenolic. 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, through 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

Catalog Series	Amps	Volts	Base Materials	Max Wire Size for Screw	Screw Size	L to L Inches	# of Lines	Features
411	5	250	Phenolic	#18	2-56	.250	1-23	Open Back
599	15	150	Phenolic	#16	5-40	.375	1-30	Open Back
699	20	150	Phenolic	#14	6-32	.437	1-23	Open Back
812	30	600	Phenolic	#12	8-32	.562	1-18	Open Back
1690	20	150	Phenolic	#14	6-32	.437	1-24	Feed Thru
2590	15	150	Phenolic	#16	6-32	.375	1-25	Printed Circuit
2690	20	300	Phenolic	#14	6-32/8-32	.437	1-25	Printed Circuit


Marathon & Kulka Single Row Terminal Blocks