Double Row Terminal Blocks

General Information

Double Row Terminal Blocks are available in many line-to-line spacings. Open and closed back designs are available as shown in the table below. Insulator bases are avaiable in both phenolic and thermoplastic material. Each series has many hardware and marking options available.

621 RZ 03

621 RZ 03

600 GP 07 PSB

600 GP 07 PSB

670A GP 04

670A GP 04

Double Row Terminal Blocks - Reference Chart
Amps Voltage Rating* Series (click links below for dimensions/catalog #s) Base Material Bare-Wire Range** Screw Size Inches L to L # of Lines Features Click link to view Datasheet
Class B Class C
30 600 600 621 RZ Plastic #14 - 22 6-32 .437 1-30 Closed Back Datasheet
20 300 150 670A RZ Plastic #12-22 6-32 .375 1-30 Closed Back Datasheet
30 300 150 671 RZ Plastic #14-22 6-32 .437 1-30 Closed Back Datasheet
30 600 600 672 RZ Plastic #12-14 8-32 .562 1-24 Closed Back Datasheet
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
20 250 n/a 670A GP (100 series) Phenolic #12-22 6-32 .375 1-36 Closed Back Datasheet
30 300 150 671 GP (200 series) Phenolic #14-22 6-32 .437 1-30 Closed Back Datasheet
30 n/a 600 672 GP (300 series) Phenolic #10-14 8-32 .562 1-24 Closed Back Datasheet
30 n/a 600 400 Phenolic #10-22 10-32 .687 1-12 Closed Back Datasheet
5 300 n/a 410 GP Phenolic #18-20 2-56 .250 1-23 Open Back* Datasheet
15 300 300 600 GP Phenolic #14-22 5-40 .375 1-22 Open Back* Datasheet
15 300 300 600A GP Phenolic #12-22 6-32 .375 1-22 Open Back* Datasheet
20 300 300 601 / 801 GP Phenolic #12-22 6-32 .437 1-23 Open Back* Datasheet
30 300 300 602 / 802 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

*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.

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, including deadfront switchboards, panel boards and service entrance devices.

Class B - Commercial appliances including business equipment and electronic data processing equipment.

Class C - Industrial, general

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