JB4SP and JB4SPT TuffSeal® Signal Trim Junction Box

As of: Wednesday, July 29, 2026

Standard Features

Jumpers to enable/disable a load cell
PreVent™ breather vent
Conformal coated circuit board
Connect two, three or four single load cells
Expansion port

Applications

Tank and hopper scales

Approvals

WARNING: Cancer and Reproductive Harm California Proposition 65

Ideal for use as a sub-junction box in a multiple modular system, the JB4SP TuffSeal® signal trim junction box sums two or four single load cell outputs with the potential to expand through the included expansion port. The Fiberglass Reinforced Polyester (FRP), NEMA Type 4X enclosure is optimal protection against harsh environments. The JB4SP TuffSeal signal trim junction box is ideal for use in tank and hopper scale applications.

JB4SP and JB4SPT TuffSeal Signal Trim Junction Box Specifications

Cable Fittings:
(4) PG7 0.118 to 0.255 in strain relief
(2) PG11 0.197 to 0.394 in strain relief

Rating/Material:
NEMA Type 4X
Polycarbonate with overlapping solid cover, stainless steel screws

Connectors:
Spring clamp screwless, 12 to 28 AWG

Trimming:
Individual cell, signal trim

Temperature:
Operating:
0 °F to 122 °F (-18 °C to 50 °C)

Potentiometers:
100,000 ohm, 25-turn cermet

Circuit Board:
3.8 × 2.3 in, with conformal coating

Warranty:
One-year limited

Approvals:
cFMus

JB4SP and JB4SPT Tuffseal Signal Trim Junction Box Dimensions

JB4SP

JB4SPT

Enclosure
A	10.04 in	E	4.00 in
B	9.52 in	F	5.95 in
C	8.50 in	G	5.71 in
D	7.43 in

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

Part #	Description	List Price
91780	Signal Trim with Expansion, Polycarbonite Nema 4 FM Approved	List Price: $310.00
92762	Signal Trim with expansion, Polycarbonite Nema 4 with transient protection	List Price: $495.00
88958	Signal Trim w/Expansion FM	List Price: $175.00
89894	Summing Box transient protection board	List Price: $235.00
165272	JB4SP/SPT/EP/EPT Junction Box Enclosure w/o Cord Grips and Filter. Includes Backplate, Cover and Gasket.	List Price: $145.00

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