Barrier Terminal Blocks

General Information

Marathon Special Products offers three types of Barrier Terminal Blocks: Double Row, Feed Thru Double Row, and Single Row. These are available in many line-to-line spacings. Some are available in either open or feed thru/printed circuit designs. The basic material is phenolic. Modifications are also available on most terminal blocks, including marking strips. Each series has differing hardware and marking options available.

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Key Benefits

Double Row Terminal Blocks - Reference Chart
Amps Voltage Rating* Series (click links below for catalog #s & hardware) Base Material Bare-Wire Range** Screw Size Inches L to L # of Lines Closed / Open Back Click link to view Datasheet
Class B Class C
20 300 150 670A RZ Plastic #12 - #22 6-32 .375 1-30 Closed Back Datasheet
30 600 600 621 RZ Plastic #12 - #22 6-32 .437 1-30 Closed Back Datasheet
30 600 600 672 RZ Plastic #12 - #14 8-32 .562 1-24 Closed Back Datasheet
30-75 600 600 1500 SERIES Phenolic #10 - #22 10-32 .562 2-12 Closed Back Datasheet
30 n/a 600 400 Phenolic #10 - #22 10-32 .687 1-12 Closed Back Datasheet
70 600 600 141x100 Plastic #10 - #16 10-32 .64 1-4 Closed Back Datasheet

 

LEGACY PARTS NOT SHOWN IN THE TABLE ABOVE CAN STILL BE FOUND USING "SEARCH BY CATALOG #" FEATURE IN HEADER (EXAMPLE: 670A GP(100 SERIES), 671 GP (200 SERIES), 672 GP (300 SERIES), 600 GP, 1600 SERIES AND 1700 SERIES.

 

*Open back terminal blocks require an insulator strip to achieve voltage rating.

**Wire Range for Bare (unprepared) only. Prepared wire range (used with crimp type ring, fork or spade terminals) is dependent on the size of the crimp terminal applied and must not exceed the Amp rating specified.

Double Row Terminal Blocks - Reference Chart
Amps Voltage Rating* Series (click links below for catalog #s & hardware) Base Material Bare-Wire Range** Screw Size Inches L to L # of Lines Closed / Open Back Click link to view Datasheet
Class B Class C
15 300 300 600A GP Phenolic #12 - #22 6-32 .375 1-22 Open Back* Datasheet
20 300 300 601 GP Phenolic #12 - #22 6-32 .437 1-23 Open Back* Datasheet
30 300 300 602 GP Phenolic #10 - #18 8-32 .562 1-26 Open Back* Datasheet
50 600 600 603 GP Phenolic #10 - #16 10-32 .687 1-12 Open Back* Datasheet
70 600 600 604 GP Phenolic #10 - #14 12-32 .875 1-8 Open Back* Datasheet
90 600 600 605 GP Phenolic #10 - #14 1/4-28 1.125 1-6 Open Back* Datasheet

 

LEGACY PARTS NOT SHOWN IN THE TABLE ABOVE CAN STILL BE FOUND USING "SEARCH BY CATALOG #" FEATURE IN HEADER (EXAMPLE: 670A GP(100 SERIES), 671 GP (200 SERIES), 672 GP (300 SERIES), 600 GP, 1600 SERIES AND 1700 SERIES.

 

*Open back terminal blocks require an insulator strip to achieve voltage rating.

**Wire Range for Bare (unprepared) only. Prepared wire range (used with crimp type ring, fork or spade terminals) is dependent on the size of the crimp terminal applied and must not exceed the Amp rating specified.

Single Row Terminal Blocks - Reference Chart
Amps Voltage Rating Series (click links below for catalog #s & hardware) Base Material Bare-Wire Range Screw Size Inches L to L # of Lines Features Click link to view Datasheet
Class B Class C
15 300 150 599 Phenolic #16-22 5-40 .375 1-30 Open Back Datasheet
20 300 150 699 Phenolic #14-20 6-32 .437 1-23 Open Back Datasheet
30 600 600 812 Phenolic #10-14 8-32 .562 1-18 Open Back Datasheet
Spacing Requirements (in inches)
  Voltage Through Air Over Surface
Class A 51-150 0.500 0.750
151-300 0.750 1.250
301-600 1.000 2.000
Class B 51-150 0.063 0.063
151-300 0.094 0.094
301-600 0.375 0.500
Class C 51-150 0.125 0.250
151-300 0.250 0.375
301-600 0.375 0.500