EL304A Signal Trim Junction Box

As of: Friday, July 11, 2025

Standard Features

Strain relief cable fittings
Individual cell signal disconnect switches
Number of cells: two or four single cells (even number of cells only)
Corner and/or section trim applications
Expansion port

Applications

Livestock scales, tank and vessel weighing

The EL304A signal trim junction box has a NEMA Type 4X, Fiberglass Reinforced Polyester (FRP) enclosure which provides optimal protection to the internal sensitive signal board. Individual cell signal disconnect switches help in diagnosing troubled load cell signals. The EL304 signal trim junction box has capacity for two or four load cells with expansion potential.

EL304A Signal Trim Junction Box Specifications

Cable Fittings:
Four nylon cable strain reliefs,
0.079 to 0.236 in
Two nylon cable strain reliefs,
0.236 to 0.354 in

Rating/Material:
NEMA Type 4X, 40 psi washdown
Fiberglass Reinforced Polyester (FRP)

Connectors:
Electrovert 0.197 in (5.0 mm) miniature screw terminals
Maximum wire size #14 AWG

Trimming:
Individual cell and section, signal trim

Potentiometers:
100,000 ohm, 25-turn cermet

Warranty:
One-year limited

EL304A Signal Trim Junction Box Dimensions

Replacement Junction Boxes, Boards or Components Table

Model	Complete J-Box Replacement	Replacement Board Only	Replacement Cord Grips	Replacement Pressure & Condensation Vent	Desiccant Packs
JB4SS	88956	88958	58983=PG7 59001=PG11	88733 PreVent™ breather (vent) 88734 (vent nut)	92240
JB4ES	91779	89446	58983=PG7 59001=PG11	88733 PreVent™ breather (vent) 88734 (vent nut)	92240
JB4SP JB4SPT	91780 92762	88958 89894	58983=PG7 59001=PG11	88733 PreVent™ breather (vent) 88734 (vent nut)	16039
JB4EP JB4EPT	91781 92763	89446 89894	58983=PG7 59001=PG11	88733 PreVent™ breather (vent) 88734 (vent nut)	16039
EL204	73428	88958	N/A	N/A	N/A
JB8SP	91782 173807 - FM Approved	89889 172415 - FM Approved	15655 (cord grip) 15656 (nut)=3/8" NPT 15628 (cord grip) 15630 (nut)=1/2" SPT	88733 PreVent™ breather (vent) 88734 (vent nut)	16039
JB8SPT	91783	89889 (load cell) 89894 (transient protection)	15655 (cord grip) 15656 (nut)=3/8" NPT 15628 (cord grip) 15630 (nut)=1/2" SPT	88733 PreVent™ breather (vent) 88734 (vent nut)	16039
EL304A	21169	21301	N/A	N/A	N/A
JB1010	36231	36351	N/A	N/A	N/A
JB1010ST	68813	68811	N/A	N/A	N/A
EL210	91781, JB4EP*	92472	58983=PG7 59001=PG11	N/A	N/A
EL211A	91780, JB4SP* (The board does not have section trim capabilities)	92473 (The board does not have section trim capabilities)	58983=PG7 59001=PG11	N/A	N/A
EL604-AL	88956, JB4SS*	88958	58983=PG7 59001=PG11	N/A	N/A
EL604STA	88956, JB4SS*	88958	58983=PG7 59001=PG11	N/A	N/A
EL604ETA	91779, JB4ES*	89446	58983=PG7 59001=PG11	N/A	N/A
EL504	21165	21296	N/A	N/A	N/A
JB808S	91782, JB8SP*	92471	15655 (cord grip) 15656 (nut)=3/8" NPT 15628 (cord grip) 15630 (nut)=1/2" SPT	N/A	N/A
JB818ST	91783, JB8SPT*	Need (1) 77445, (1) 89889, (1) 89894	15655 (cord grip) 15656 (nut)=3/8" NPT 15628 (cord grip) 15630 (nut)=1/2" SPT	N/A	N/A

*See catalog page for enclosure dimensions

Parts

Part #	Description

21169	J-Box,ST EL304A 4 CHAN Expandable FRP NEMA 4X
21301	Board,ST EL304A 4 CHAN
165275	Enclosure,EL304A Only EL304A Junction Box Enclosure With Cord Grips Board Backplate and Cover